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tbi to tpi

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Old Jun 23, 2010 | 11:11 PM
  #1  
bigred75's Avatar
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From: stedman
Car: 1992 25th anniversary RS Camaro
Engine: 305 T.B.I.
Transmission: ????
Axle/Gears: ??????
tbi to tpi

how diffucult would it be to swap from a tbi to tpi? would it gain any power? is it worth it?
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Old Jun 23, 2010 | 11:37 PM
  #2  
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From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: tbi to tpi

If you could get a donor car would be muh better if not expect to spend about $800 in just parts. I was thinking of doing his swap too but then decided to just stay with tbi and drop a 350. But it's up to you to do the swap if you have the money I say go for it.
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Old Jun 24, 2010 | 01:43 AM
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From: Hungary
Car: 1992 Camaro RS
Engine: 3.1L V6
Transmission: 700-R4
Axle/Gears: 3.23
Re: tbi to tpi

Swapping out the current TBI for a TPI will definitely gain some power.
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Old Jun 24, 2010 | 02:09 AM
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bigred75's Avatar
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From: stedman
Car: 1992 25th anniversary RS Camaro
Engine: 305 T.B.I.
Transmission: ????
Axle/Gears: ??????
Re: tbi to tpi

well there is a guy selling a full tpi unti down to the wireharness and computer for 300. about how much would i look at gaining?
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Old Jun 24, 2010 | 02:53 AM
  #5  
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From: Hungary
Car: 1992 Camaro RS
Engine: 3.1L V6
Transmission: 700-R4
Axle/Gears: 3.23
Re: tbi to tpi

Factory HP & torque informations:
TBI - HP: 170, torque: 255
TPI - HP: 205, torque: 285
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Old Jun 24, 2010 | 06:43 AM
  #6  
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From: Chicago, IL
Car: 1986 Pontiac Firebird
Engine: 97 LT1 W/ Alot of goodies.
Transmission: 4L60E W/ Yank SS3600
Axle/Gears: 3.27 9 Bolt BW
Re: tbi to tpi

Originally Posted by giszo
Factory HP & torque informations:
TBI - HP: 170, torque: 255
TPI - HP: 205, torque: 285

I am pretty sure L03s and LB9's have more differences than just the breather setup but who knows. Your also gonna need more than just the tpi setup, There is countless threads on here asking about the swap. If I recall you will need a diff distributor and beefier fuel pump as well.

In the end, I say save the money and just purchase a L98.
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Old Jun 24, 2010 | 08:13 AM
  #7  
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From: Everett, MA . USA
Car: 89 FORMULA FIREBIRD, 86 CHEVY CAMARO
Engine: L98, LB9 RESPECTIVLY
Transmission: 700 R4 (BOTH)
Re: tbi to tpi

You will see some increase, but you won't see factory tpi numbers, like others have said there are more differences than just the tpi.
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Old Jun 24, 2010 | 01:51 PM
  #8  
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From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: tbi to tpi

It won't be the same since it's still gonna have the L03 cam and heads which is what don't help much on power although dyno don done his swap and I think he gained around 10 hp and 40 ft torque not sure can't remember, if you search you will find it.
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Old Jun 24, 2010 | 03:19 PM
  #9  
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From: Monroe,NC
Car: 90 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 9 bolt/3.27
Re: tbi to tpi

The heads are different but some say that both the TBI and the low level TPI (205 hp) use the same cam. The distributor should be the same as I kept my OE dist. when I did my swap. There's a thread on here by someone concerning tuning and using the TBI heads with a TPI and the results which were impressive to say the least.
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