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TBI on a 94 4X4 Z71

 
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razor1115
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Joined: 04 Sep 2003
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PostPosted: Thu Jan 29, 2004 8:33 am    Post subject: TBI on a 94 4X4 Z71 Reply with quote

I have a GM 350 1994 TBI in my truck. It will be time soon to freshen it up as the truck is still in excellent shape. Stock was 225hp. The newer Vortecs, I believe, are in the neighborhood of 285-300hp? I am not proposing a head swap to Vortecs with the manifold change or anything like that. I AM trying to find the limitations on adding power to my current set-up. I would swap in a little more cam with the refresh. Probably a roller cam and possibly rockers. I do not know and cannot find the limiting specs on my throttle body as well as the MAP sensor and computer. Does anyone know these items or direct me to a source of info. Surely someone must have already done a rebuild like this retaining the stock fuel injection, but bumped up the power without overriding the TBI, computer?

Any help would be appreciated,
Thanks
Zack
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badbowtie
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Joined: 29 Feb 2004
Posts: 2
Location: Barrie, Ontario
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PostPosted: Sun Feb 29, 2004 10:38 am    Post subject: Reply with quote

The biggest problem i found when rebuilding a tbi engine was to be carful with the cam specs. I have a 89 tbi setup in my s10. I out a mild cam in it and i think it was pushing it. If the cam doesnt dreate enough vacumm the comuter thinks its at part throttle even though the tps says its not and it does idle right and will runn a bit rich.

You can buy a map sensor adjustor from turbo city to correct for this but becuase of bad parts and not so great customer service i dont reccomend them.
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Sun Feb 29, 2004 12:46 pm    Post subject: Re: TBI on a 94 4X4 Z71 Reply with quote

razor1115 wrote:
I have a GM 350 1994 TBI in my truck. It will be time soon to freshen it up as the truck is still in excellent shape. Stock was 225hp. The newer Vortecs, I believe, are in the neighborhood of 285-300hp? I am not proposing a head swap to Vortecs with the manifold change or anything like that. I AM trying to find the limitations on adding power to my current set-up. I would swap in a little more cam with the refresh. Probably a roller cam and possibly rockers. I do not know and cannot find the limiting specs on my throttle body as well as the MAP sensor and computer. Does anyone know these items or direct me to a source of info. Surely someone must have already done a rebuild like this retaining the stock fuel injection, but bumped up the power without overriding the TBI, computer?

Any help would be appreciated,
Thanks
Zack
Smile


Check out http://www.tunercat.com If your into burning your own chips you can change the stock computer to compensate for the changes made in the engine.

You can swap in a bigger cam but just stay under 215 @ 0.05" and you should be all set.
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