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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 09-22-2008, 01:38 PM   #1
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350 tpi engine mods

i am looking to do some mods on my l98 350 from my 89 trans am. i wanna push about 350 to 400 horse. any suggestions
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Old 09-22-2008, 02:04 PM   #2
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Car: 91 Trans Am
Engine: 5.7 TPI L98
Transmission: 700R4
Axle/Gears: 3.23

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Re: 350 tpi engine mods

lucky you..you have MAF so it will be easier for you. look in to heads and cam
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Old 09-22-2008, 02:15 PM   #3
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Car: 1989 Firebird Formula
Engine: 355 HSR
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Re: 350 tpi engine mods

Do a search!!! There are YEARS worth of people doing mods in this forum.
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Old 09-22-2008, 05:09 PM   #4
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Re: 350 tpi engine mods

With the power you are wanting, the TPI will not be your friend.

You could really wake it up by doing a full exhaust(headers included) Either buy an aftermarket base or port the stock one to hell and back, after market runners, port the upper plenum.

It will make a nice difference, but in no way get you close to the numbers you want.

What are you looking to do with the car? Quarter mile times?

The above mentioned mods and a nice TQ converter could net you some lower 13 second quarter mile times on a drag radial.

I have a friend who went 13.1 at 99 with the mods i mentioned above.
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Old 09-22-2008, 05:09 PM
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