Author Topic: SPR Performance TBI  (Read 884 times)

jonathonar89

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SPR Performance TBI
« on: August 28, 2017, 06:51:56 PM »
Finally got around to getting my TBI rebuilt from Sean at SPR Performance.  This is an original TBI from a late 80's 454 that I picked up from a member on the Performance Years forum.  After sending them this greasy/dusty unit, this is what they sent back.  I was overly impressed with how it came back.  The turn around time was 2 weeks.  It also came with fuel fitting o-ring gaskets, air cleaner gaskets and a printed assembly/setup manual.

-Throttle bores were bored to 54mm (bigger throttle blades).
-Throttle shaft thinned (more cfm).
-Base bored to match throttle bores.
-Fuel pressure regulator block-off plate installed.
-New genuine AC Delco sensors
-Injectors cleaned
-All hardware replaced with stainless.

http://www.sprperformance.com/

SPR Performance 454 TBI by Jonathon Randolph, on Flickr

SPR Performance 454 TBI by Jonathon Randolph, on Flickr

454 base bored out by Jonathon Randolph, on Flickr
1979 Trans Am 400 T-top - Platinum Silver, Carmine Interior
http://transamcountry.com/community/index.php?topic=61460.0

FormTA

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Re: SPR Performance TBI
« Reply #1 on: August 28, 2017, 07:16:09 PM »
Wow! For a TBI unit anyway. Without asking how much that cost... Was it worth it/ economical? I am curious as I went the LS route on my TA but I am thinking of a TBI install on the 301 in my Formula for drivability reasons.
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???

jonathonar89

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Re: SPR Performance TBI
« Reply #2 on: August 28, 2017, 07:59:47 PM »
Wow! For a TBI unit anyway. Without asking how much that cost... Was it worth it/ economical? I am curious as I went the LS route on my TA but I am thinking of a TBI install on the 301 in my Formula for drivability reasons.

Considering I'm using a Megasquirt efi computer, I think it's worth it.  In the future, if I want port injection, I can buy a port efi intake and simply use the throttle body as an air door (the injector assembly on TBI units are completely removable).  With other packaged aftermarket TBI's like Holley Sniper or FiTech, you're pretty much stuck with TBI unless you buy a whole new system.

Also, you don't have to go all out on a TBI like I did with this one.  I nabbed a bunch of TBI's off trucks for $30 a piece in a few junkyards this summer.  With a diyautotune carb-to-efi kit, you can dial in your cost to about $1k for TBI if you don't chase down computer timing control....that can, however, be added at a later time. 

I'm pretty much following a version of the carb-to-efi writeup I always refer people to.  Late-model TBI and Megasquirt pretty much goes into our cars like it was designed for it. 
https://www.diyautotune.com/support/tech/install/chevrolet-gm/carb-to-efi/

Hot Rod Magazine even wrote an article on this called, "A Homemade TBI Conversion for $904"
http://www.hotrod.com/articles/a-homemade-tbi-conversion-for-904/
1979 Trans Am 400 T-top - Platinum Silver, Carmine Interior
http://transamcountry.com/community/index.php?topic=61460.0

djustice

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Re: SPR Performance TBI
« Reply #3 on: September 14, 2017, 03:47:26 AM »
Someone has pride in what they do :D  reason enough to do business with said company.
1973 Firebird formula 400 W/YC code 455 (73 casting)
6x-8 heads, 140 lb spring preassure closed, scorpion 1.5 Roller rockers, holley 4160 750 cfm, edelbrock performer inntake, Headman 28150 headers 1 3/4" primary, Pypes SGF11R exhaust, cam unknown, alu radiator w/twin 12" fans. Yukon duragrip posi w/3.42 gears.

jonathonar89

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Re: SPR Performance TBI
« Reply #4 on: September 14, 2017, 10:57:51 PM »
Someone has pride in what they do :D  reason enough to do business with said company.

The owner Sean is a pretty cool guy.  He does the TBI's like this as a hobby/side business aside from his main job.  Hopefully I can get this thing running soon enough.  This next year I'm concentrating on getting ready to move so my project is taking a slight back seat.
1979 Trans Am 400 T-top - Platinum Silver, Carmine Interior
http://transamcountry.com/community/index.php?topic=61460.0

Re: SPR Performance TBI
« Reply #4 on: September 14, 2017, 10:57:51 PM »

jonathonar89

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Re: SPR Performance TBI
« Reply #5 on: September 16, 2017, 11:35:19 AM »
I found on the thirdgen.org forum someone posted a link to a new injector pod assembly that allows for modern style short injectors to be installed on old GM TBI units. 

Check it out if interested...
 
http://www.ebay.com/itm/252865497725?rmvSB=true
1979 Trans Am 400 T-top - Platinum Silver, Carmine Interior
http://transamcountry.com/community/index.php?topic=61460.0

Re: SPR Performance TBI
« Reply #5 on: September 16, 2017, 11:35:19 AM »
You can help support TAC!