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TBI to TPI ?

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Old 11-07-2010, 07:45 PM
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TBI to TPI ?

Hey i have a 92 rs with a 305 tbi and i wasnt wanting to switch engines just take off the tbi and convert it to tpi and ideas please let me know
Old 11-07-2010, 07:57 PM
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: TBI to TPI ?

This has been covered many times i was wanting to do this swap too but i decided its to expensive so im staying with tbi. But heres the list of parts that you will need you will
also need more but this is what i remember.
Complete tpi
91-92 tpi wiring harness and ecm
tpi fuel pump
and somehing with the vss cant really remeber what it was.
Old 11-08-2010, 01:34 AM
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Re: TBI to TPI ?

It's a lot of work, for little/no gain.

That being said....I have a MAP ECU from a 1990 corvette with a chip if you're interested.
Old 11-08-2010, 05:34 AM
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Re: TBI to TPI ?



This has been covered extensively on the boards. The gain with a stock RS will be minimal as at this point, the engine and exhaust are what is slowing the car down. Better investment would be to upgrade to a full 3" exhaust with headers. That will go a long way to freeing up some power. GM has a penchant for using the some of the worst exhaust systems, even on their better engines.
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