Author Topic: How to modify the Turbo engine?  (Read 6275 times)

800qjet

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How to modify the Turbo engine?
« on: September 08, 2012, 01:02:09 PM »
Just curious as to how the 301 turbo engine might be modified for more performance. I saw a picture of a turbo intake on Ebay and wondered if the opening on top of the intake manifold can be enlarged? I thought my "79 400 had a lot of "stuff" under the hood but these really have stuff.
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rck2004

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Re: How to modify the Turbo engine?
« Reply #1 on: September 10, 2012, 06:38:39 PM »
Bottom end is pretty weak. would not waste my time and go with a butler motor instead.

800qjet

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Re: How to modify the Turbo engine?
« Reply #2 on: September 10, 2012, 08:01:27 PM »
As I wrote, I was just curious about the engine as I don't have one. I had read on another thread that there were people using the 301 section that are very familiar with the turbo. My engine is from Jim Taylor Engine Service.
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mrbandit

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Re: How to modify the Turbo engine?
« Reply #3 on: September 11, 2012, 06:13:58 AM »
Actually a 301T block is stout, but the turbo engine is very specific.  The heads and intake are specific to the setup.  There are some very respectable numbers out there now on the 301 Turbo, but it takes effort to get them.  Oh that and cash.   :D

800qjet

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Re: How to modify the Turbo engine?
« Reply #4 on: September 11, 2012, 08:44:25 AM »
Interesting - I thought that the block might have been made weaker in an effort to cut weight, as with the 403's windowed main webs.
Are the stacked intake ports a problem, or is it just that Pontiac didn't want customers to change intake manifolds? I had heard that there was no way to put other heads on the engine either. There's probably a lot of misinformation out there.
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Re: How to modify the Turbo engine?
« Reply #4 on: September 11, 2012, 08:44:25 AM »

DEIVIONCRX

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Re: How to modify the Turbo engine?
« Reply #5 on: September 11, 2012, 09:47:24 AM »
You should check out the 301Garage.com.  They have a lot of good info on the 301 there.  Somebody has put a different set of heads on it, and a stroker kit.  Stock people have gotten them pretty quick, but the stock heads are prone to cracking, the exhaust manifolds are very prone to cracking and the head gaskets like to blow out after a while, but that can be fixed with some aftermarkets and other parts.
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jjr

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Re: How to modify the Turbo engine?
« Reply #6 on: April 09, 2013, 08:30:15 AM »

 I know this is an old topic, but in the interest of accurate information...

 Perhaps the largest issue with the 301's use resides in the fact that
They were heavily EPA tuned. Removing the "de-tune" is the first
step.

In the case of the turbo cars, the factory turned down the boost so
they would not have as many warranty claims.

 Strength wise, the 301 is made from the very same metals as the
400 and 455 - and even made on the same tooling.

 But there is a design limit to RPM based on the fact the 301 has
lighter crankshaft. So if you over-rev it premature bearing wear
will result, just like any other engine.

 Joe
1979 10th Aniv 400/4spd
1980 Black SE 301NA
1980 Indy Turbo Pace 301T
1981 Turbo 301T
1981 Black SE 301T
1981 Daytona Pace 301T
www.301garage.com/forum/

Doright

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Re: How to modify the Turbo engine?
« Reply #7 on: September 01, 2013, 09:12:17 AM »

 I know this is an old topic, but in the interest of accurate information...

 Perhaps the largest issue with the 301's use resides in the fact that
They were heavily EPA tuned. Removing the "de-tune" is the first
step.

In the case of the turbo cars, the factory turned down the boost so
they would not have as many warranty claims.

 Strength wise, the 301 is made from the very same metals as the
400 and 455 - and even made on the same tooling.

 But there is a design limit to RPM based on the fact the 301 has
lighter crankshaft. So if you over-rev it premature bearing wear
will result, just like any other engine.

 Joe


 :wink:
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A&P Mechanic & FCC
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oldskool

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Re: How to modify the Turbo engine?
« Reply #8 on: March 31, 2014, 02:23:20 PM »
I'm fairly new to this site, so I started lookin back thru some of the older threads. I've noticed how most Pontiac guys always badmouth the little 301 engine. But every time I hear it again I'm reminded of this stock class 301T that ran low 12's. I've read that this and others with this combo have held the national record in their class !

http://www.highperformancepontiac.com/events/hppp_0911_the_11th_annual_pontiac_heaven/viewall.html#ixzz1mZ2Cv3B7
« Last Edit: March 31, 2014, 02:27:04 PM by oldskool »

Re: How to modify the Turbo engine?
« Reply #8 on: March 31, 2014, 02:23:20 PM »
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