Author Topic: LS376/515 swap in a '78 Trans Am  (Read 5780 times)

Nexus

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Re: LS376/515 swap in a '78 Trans Am
« Reply #80 on: April 27, 2019, 10:54:09 AM »
I'm just caught up from when you posted the video clip...does it ever sound smooth.....right on...won't be too long now!!!!
Charlie

79 Esprit but like many, it will be a T/A clone
(18 years and counting but still have her)

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #81 on: April 30, 2019, 07:01:20 AM »
I'm just caught up from when you posted the video clip...does it ever sound smooth.....right on...won't be too long now!!!!

Yes, It's run enough now that it settles in at around 1100 rpm idle and has a nice snappy sound to it!

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #82 on: April 30, 2019, 07:08:32 AM »
So, a couple posts ago I said that it was getting too hot after running for a while.  It heats up like it doesn't have coolant in it.  I did replace the lower radiator hose and now I believe that's not choking flow.  It still ran hot and I never saw anything circulating in the radiator and thought the tstat might be stuck closed.  Then I removed the Tstat and ran it again, this time it got hot just as before only it took a few more minutes to get hot.  Again, no circulation in the radiator. 

A bad water pump?
Is there some priming sequence I should have followed?

Updated71

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Re: LS376/515 swap in a '78 Trans Am
« Reply #83 on: May 01, 2019, 05:30:05 PM »
Could it be an air pocket?
The surgeon general never said nuthin' 'bout smokin' the competition!

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #84 on: May 10, 2019, 07:22:02 AM »
A brief update...  I replaced the water pump with one that I got from a good friend and after removing the Tstat again, that seems to allow it to run for extended periods of time while staying around 200F.  While this was going on I got to noticing that the Holley system doesn't seem to go into Closed loop mode.  It starts quickly and then idles for around 20 sec at 850-1000 rpm and then it slowly picks up rpm until it goes to 1500-1700 rpm and stays there.  The A/F says it's running at 11.5 and the learn % is 0.  I went back through the handheld to make sure I have learning clicked to "on" and 100%. I have the CTS set to 150 and both the coolant enable and rpm enable are set to "on".


Re: LS376/515 swap in a '78 Trans Am
« Reply #84 on: May 10, 2019, 07:22:02 AM »

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #85 on: May 13, 2019, 06:51:01 AM »
In my quest to get the engine to run in closed loop mode I poked around until it no longer starts again.  I thought for a bit that maybe I was having fuel pump problems but, no the fuel pump is working just fine.  It does start if I pour a bit of fuel manually down the TB, so the injectors aren't firing!
OMG- when does this BS stop? 

I know a lot of people have great experiences with their Holley EFI systems, I clearly am not in that category!  And I am not blaming all my woes on the Holley, every new part on this update has had one problem or another.

Vent paused for now...

FormTA

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Re: LS376/515 swap in a '78 Trans Am
« Reply #86 on: May 13, 2019, 08:13:31 AM »
Wow, sorry the hear you are having all these issues with the swap. Kind of makes me glad I used the lame stock 1998 ecm with my LS swap. Good luck, I hope it is an easy fix for you.
79 Trans am 301 (work in progress) LS swap n progress
79 Formula 301 (Work in progress)
67 RS Camaro (Work in progress)
See the recurring theme???

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skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #87 on: May 14, 2019, 06:59:19 AM »
Wow, sorry the hear you are having all these issues with the swap. Kind of makes me glad I used the lame stock 1998 ecm with my LS swap. Good luck, I hope it is an easy fix for you.

I normally go the route you went Form, this time I wanted things to work the very first time and not have the regular trouble I have trying to get some used parts to work with other used parts.  Turns out, at least this time, that the new parts don't go together any better then the used parts.  I guess if this issue isn't a relay or some inexpensive part store piece, I can send it back to Holley and they will take care of it - that just means that it's on blocks for that much longer!

ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #88 on: May 17, 2019, 11:15:56 AM »
I'll trade you straight up for all my stock EFI stuff for your Holley stuff :cool:

Did you make sure that the IAC was within the 2-10 range? If not, you will need to adjust the throttle air blade position until you reach that range. It sounds to me like you are possibly either running out of the range for the IAC, or you are potentially running low on fuel pressure. Do you have a way to log your fuel pressure? And was it set to 58 PSI?

My Dad's Chevelle was doing the same thing with the idle that wouldn't go below 1300-1500 and it ended up being a combination of those two things. Also, the ECU won't go into closed loop until it's running within the parameters of your tune. So like my dad's for example wasn't learning since it wasn't getting hot enough. We had to fix that before it would learn.

Hope that helps.
« Last Edit: May 17, 2019, 11:18:26 AM by ryeguy2006a »

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
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ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #89 on: May 17, 2019, 12:10:44 PM »
Oh and I re-read one of your earlier posts and this makes sense now. If you have a trapped air pocket, your temp sensor may be reading incorrectly and causing the ECU not to go into closed loop. I would try raising the front of your car up 12" or so and opening one of the front steam vents. That may help to relieve the pocket. You could also open the other 3 until antifreeze comes out to help with bleeding the system. What's nice is some of the earlier LS motors came with a 4 corner steam port that tied them all together and you can route them back into the radiator. That way it basically purges itself.

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
My Build: http://transamcountry.com/community/index.php?topic=24465.0

New project: 1968 Camaro with 6?.?0?  5.3 w/ Z06 cam/T56
http://transamcountry.com/community/index.php?topic=74591.0

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #90 on: May 21, 2019, 07:31:59 AM »
I'll trade you straight up for all my stock EFI stuff for your Holley stuff :cool:

Did you make sure that the IAC was within the 2-10 range? If not, you will need to adjust the throttle air blade position until you reach that range. It sounds to me like you are possibly either running out of the range for the IAC, or you are potentially running low on fuel pressure. Do you have a way to log your fuel pressure? And was it set to 58 PSI?

My Dad's Chevelle was doing the same thing with the idle that wouldn't go below 1300-1500 and it ended up being a combination of those two things. Also, the ECU won't go into closed loop until it's running within the parameters of your tune. So like my dad's for example wasn't learning since it wasn't getting hot enough. We had to fix that before it would learn.

Hope that helps.

I'll keep trying with this Holley stuff- Thanks tho!
The TPS is 0, and I thought that was the issue but, Ill go back to see the IAC value.  Fuel pressure is set to 42-44 psi which is what says in the manual..

ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #91 on: May 21, 2019, 09:47:28 AM »
I was kidding about swapping ECU's haha.

But you are right, on the 43 psi. I forget that you are running the terminator throttlebody on the LS engine. Keep me posted as we are having a little trouble with my dad's system too. He opted to swap from the large cap HEI to the small cap and when he did it's running terrible now... Trying to diagnose what is wrong with it to cause this issue.

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
My Build: http://transamcountry.com/community/index.php?topic=24465.0

New project: 1968 Camaro with 6?.?0?  5.3 w/ Z06 cam/T56
http://transamcountry.com/community/index.php?topic=74591.0

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #92 on: May 28, 2019, 08:16:39 AM »
And finally the long awaited, at least by me, video of the LS powered Y88-R!

https://youtu.be/5yl9Pja118w
« Last Edit: June 25, 2019, 06:31:46 AM by skisix38off »

angelo

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Re: LS376/515 swap in a '78 Trans Am
« Reply #93 on: June 01, 2019, 07:15:25 PM »
Awesome! This is inspiring and greatly appreciated when pioneering these swaps posting the progress. I haven't seen too many people do an LS swap with a shaker TA let alone keep it appearing carbureted/throttle body for the shaker. Very cool!
81' ex-Turbo converted to 78 Trans Am

Nexus

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Re: LS376/515 swap in a '78 Trans Am
« Reply #94 on: June 01, 2019, 07:23:55 PM »
That was fantastic stuff...Angelo is right...very inspiring!!!
Charlie

79 Esprit but like many, it will be a T/A clone
(18 years and counting but still have her)

Re: LS376/515 swap in a '78 Trans Am
« Reply #94 on: June 01, 2019, 07:23:55 PM »



Casey

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Re: LS376/515 swap in a '78 Trans Am
« Reply #95 on: June 01, 2019, 10:11:26 PM »
I just finished reading through the whole thread and I only have one thing to say.

You'll need a new shaker decal that says 6.1L now.

Just kidding(no I'm serious), it's nice to see it up and running finally.  If it's any consolation it seemed to go faster than most LS swaps I see.  I was going to say nothing like having a V8 backed by a manual, but you already had that.  So I'll throw in the addition of nothing like having a fuel injected V8 backed by a manual. :P

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #96 on: June 03, 2019, 06:54:04 AM »
Thanks guys, appreciate the positive comments.  I hope some of the stuff here will help pave the way and help others make progress.

Box- I'm attaching a pic of my shaker scope, it's already very custom.


skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #97 on: June 07, 2019, 07:19:06 AM »
I'v e been driving it around a lot more on the streets in my neighborhood, all first gear stuff and some second gear.  Last night I took it out of the hood and was able to get more of a feel for the new engine.  WOW!  That's a lot of power!  And the power just keeps coming and coming.  Running up to 6K rpm, the engine just sounds like it wants more and isn't spinning hard at all.  This is going to be a lot of fun.

It's also great that it starts right up and runs!

silver78

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Re: LS376/515 swap in a '78 Trans Am
« Reply #98 on: June 07, 2019, 04:27:41 PM »
Nice work.
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Casey

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Re: LS376/515 swap in a '78 Trans Am
« Reply #99 on: June 07, 2019, 06:46:27 PM »
I'v e been driving it around a lot more on the streets in my neighborhood, all first gear stuff and some second gear.  Last night I took it out of the hood and was able to get more of a feel for the new engine.  WOW!  That's a lot of power!  And the power just keeps coming and coming.  Running up to 6K rpm, the engine just sounds like it wants more and isn't spinning hard at all.  This is going to be a lot of fun.

It's also great that it starts right up and runs!
That's the downside to most higher power cars, you rev out out second and you're breaking all the speed limits in your state.  Good thing yours is mostly a track car where you can utilize it.

ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #100 on: June 09, 2019, 09:09:11 PM »
Congrats! Love "mom" driving with no shoes haha. Now get it out try out the other 4 gears  :cool:

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
My Build: http://transamcountry.com/community/index.php?topic=24465.0

New project: 1968 Camaro with 6?.?0?  5.3 w/ Z06 cam/T56
http://transamcountry.com/community/index.php?topic=74591.0

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #101 on: June 13, 2019, 10:15:03 AM »
I've been driving it around fairly regularly this week and drove it on my commute to work this morning, 34miles and all hwy.  I was able to use every gear it has today!  It's a bit heavily cammed to lope around in 6th gear at 1600 rpm and 75mph but, it cruises great @2200 in 5th gear.  The Holley is learning as I am driving it in all different scenerios, except what Autocross will bring it- hard to drive that way on the street. 

I'm loving how it fires right up and settles into a nice idle!  And I also don't have those darn credit card dragging headers on it so I don't have to be as worried about hitting every little thing in the road!

angelo

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Re: LS376/515 swap in a '78 Trans Am
« Reply #102 on: June 13, 2019, 10:43:47 AM »
What rear axle ratio are you running?
81' ex-Turbo converted to 78 Trans Am

ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #103 on: June 14, 2019, 10:38:15 AM »
Glad to hear that you got it out on the highway! I'm in the process of selling my stock ECU's and buying one of the Holley Terminator X units.

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
My Build: http://transamcountry.com/community/index.php?topic=24465.0

New project: 1968 Camaro with 6?.?0?  5.3 w/ Z06 cam/T56
http://transamcountry.com/community/index.php?topic=74591.0

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #104 on: June 17, 2019, 06:31:11 AM »
What rear axle ratio are you running?

3.23

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #105 on: June 24, 2019, 06:51:09 AM »
Got it out on track this weekend and had a great first event with the new config.  Can easily feel the weight that's not over the front wheels- and I mean very easy to tell.  Way more nimble and sticks a lot better in tight turns where it used to want to push.  The Holley is still learning and starting to catch up to the very high strung LS3.  I believe I won the CAM-T class I was in but, really there were only a few cars so that wasn't a high bar.  On the other hand though, there were a lot of 5th and 6th gen Camaro's and S550 Mustangs that weren't able to beat my time.

The best part...  I drove it home and don't have to repair anything, although there is still a lot to finish.








ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #106 on: June 24, 2019, 07:21:47 AM »
Glad you got it all straightened out!

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
My Build: http://transamcountry.com/community/index.php?topic=24465.0

New project: 1968 Camaro with 6?.?0?  5.3 w/ Z06 cam/T56
http://transamcountry.com/community/index.php?topic=74591.0

Casey

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Re: LS376/515 swap in a '78 Trans Am
« Reply #107 on: June 24, 2019, 06:35:03 PM »
It's amazing what can happen when you're not nose heavy and don't plow through turns.  Glad to hear it's such an overall improvement.

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #108 on: June 25, 2019, 06:55:34 AM »
I believe my 12.5" dia x 2.5" air filter isn't nearly enough anymore, I should have thought about this earlier.  What are folks doing about getting enough air filter area and maintaining their shaker scoop without attaching to the hood?  I think I need something more like 14" dia x 4" , so I think I will need to get creative on how to attach the shaker scoop.

ryeguy2006a

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Re: LS376/515 swap in a '78 Trans Am
« Reply #109 on: June 25, 2019, 07:31:17 AM »
I've seen a lot of those filter covers that also have a built in filter on them. I'll bet that would solve your air issue.

1976 Trans Am LS1, 6 speed, C5 12.8" Brakes, LS1 rear 12" brakes, 17" Aluminum Rims, and much more...SOLD
My Build: http://transamcountry.com/community/index.php?topic=24465.0

New project: 1968 Camaro with 6?.?0?  5.3 w/ Z06 cam/T56
http://transamcountry.com/community/index.php?topic=74591.0

Casey

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Re: LS376/515 swap in a '78 Trans Am
« Reply #110 on: June 25, 2019, 06:54:42 PM »
I think PTFB? showed something about a new shaker scoop for using bigger filters, so might see if they are releasing that soon enough.

Based on the maths of 376 cu in x 7000 rpm(not sure if you rev that high) / 3,456 = 762 CFM rounded up

So for a round filter you'd need D x H x 6 x 3.14 = 762, 14 x 3 x 6 x 3.14 = 791 CFM rounded down
That or keeping diameter stock and increasing height, 12.75 x 3.5 x 6 x 3.14 = 841 CFM rounded up

12.5 x 2.5 is 589 CFM rounded up, so yeah you're definitely under filtered assuming you're revving that high.  Even if you're more modest at 6,000 rpm that's still 653 CFM rounded up.  Which I'm confused though since looking at the stock replacement for a '78 400 car it shows it being a 12.75(averaging ID and OD) x 3 so stock being 12.75 x 3 x 6 x 3.14 = 721 CFM rounded up, so not sure why you'd have gone smaller than stock.

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #111 on: July 01, 2019, 06:58:46 AM »
Thanks Casey!  I've run the K&N filter for years and haven't ever though much of it, It's probably been choking me down for a while now but especially with the LS3.  I was driving it around last week trying to get more learning done.  That was interesting because it would learn and I could feel it with every pull we made.  I was on a highway and in 4th gear pulling from 2K - 3.5K and did that for 12 miles or so and that cleaned things up greatly.  What I also learned was the computer thought I was only getting 48% TPS- no wonder the tune was so far off!  I re-calibrated the TPS sensor and off we went and THAT'S WHAT I WAS LOOKING FOR!  Holy cow that's a lot of power! 

I had my 2nd event of the summer on Saturday and I was much happier with the performance!  This TA is FAST now.  Not only straight line but it corners much better with the lighter block.  What I wanted to have was a reliable car that didn't have many, if any, little quirks and for the next year or two was faster than I can drive- That's what I have now and the tune is still far from optimal.

Success!

Casey

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Re: LS376/515 swap in a '78 Trans Am
« Reply #112 on: July 01, 2019, 02:12:24 PM »
No problem, at least now you know you can find a filter that'll meet your needs within the confines of the stock shaker.

Ha, I always think it'd be fun to drive a car that'd be hard to keep up with and have a manual.  Like the C7 ZR-1 with the 7-speed would just be bonkers to keep up with.  Gah, the level of skill to fully utilize that...

Nexus

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Re: LS376/515 swap in a '78 Trans Am
« Reply #113 on: July 02, 2019, 09:18:19 PM »
Very cool. I'm excited that it is working how you want it too. What a good feeling and an accomplishment. Makes me think I might think about doing this kin of swap in the distant future but i'm not racing and just want to cruise around in it...for now anyway

Love the look of your car...it is very cool
Charlie

79 Esprit but like many, it will be a T/A clone
(18 years and counting but still have her)

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #114 on: July 09, 2019, 06:49:47 AM »
Very cool. I'm excited that it is working how you want it too. What a good feeling and an accomplishment. Makes me think I might think about doing this kin of swap in the distant future but i'm not racing and just want to cruise around in it...for now anyway

Love the look of your car...it is very cool

Thanks for the positive comment!   :P :P :P :P

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #115 on: September 24, 2019, 06:34:34 AM »
We've been working with the Tune of the Holley, it's been great for street driving but the base tune was a ways off for racing and this LS3 with ASA racing cam.  Once we made some tweaks to the tune, it's been running great and I love the power and RPM range of this engine.  We went to Holley Fest in Bowling Green and that was such a blast!  The car ran great on and off track- We ran two different AutoX courses, Drag racing and a Speed Stop, plus driving back and forth in the city of Bowling Green.  Saturday we had to fight traffic getting into Beach Bend Park, they set a new record for attendance, and I sat in stop and go traffic for 90 minutes and it stayed cool and ran great.  I can't say the same for my left leg!  We ended up slightly better than mid pack, which is great for the field we raced with!  I ended up driving the car 90 miles home because we dropped the trailer off - a great showing for the car and it's new potential!












Nexus

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Re: LS376/515 swap in a '78 Trans Am
« Reply #116 on: September 25, 2019, 09:51:53 PM »
Very cool

So dumb question time...do you have the ability to switch the tune from street to strip depending if your cruising or racing or does it just automatically figure it out based on the fuel demands at the time?
Charlie

79 Esprit but like many, it will be a T/A clone
(18 years and counting but still have her)

skisix38off

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Re: LS376/515 swap in a '78 Trans Am
« Reply #117 on: September 26, 2019, 06:44:04 AM »
Very cool

So dumb question time...do you have the ability to switch the tune from street to strip depending if your cruising or racing or does it just automatically figure it out based on the fuel demands at the time?

I can switch tunes with the computer- for instance I would switch tunes going from 93 pump gas to E85 or to 110 race gas.  The computer does a lot of figuring out on it's own though.  There's a map of air to fuel ratio's, a map of fuel usage and spark all related to the load on the engine and the rpm of the engine.  The computer makes changes to the fuel usage to achieve the air/fuel.

Nexus

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Re: LS376/515 swap in a '78 Trans Am
« Reply #118 on: September 26, 2019, 09:01:36 PM »
Oh very cool
Charlie

79 Esprit but like many, it will be a T/A clone
(18 years and counting but still have her)

silver78

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Re: LS376/515 swap in a '78 Trans Am
« Reply #119 on: October 07, 2019, 07:00:41 PM »
I posted your run at the Goodguys auto cross on my Face book page. lol Sorry didn't catch up with ya there we where all over the place.
MY BUILD THREAD:  http://transamcountry.com/community/index.php?topic=41850.0

Previous builds:
65 Galaxie sold
67 camaro RS sold
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69 camaro sold
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81 T/A 4 spd sold
86 IROC sold
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92 Z-28 sold
93 9C1 Caprice sold
94 Impala SS sold

Re: LS376/515 swap in a '78 Trans Am
« Reply #119 on: October 07, 2019, 07:00:41 PM »
You can help support TAC!