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TBI (LO3) to TPI (L98)

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Old Jan 20, 2008 | 12:34 AM
  #1  
robster66's Avatar
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From: Glen Mills, PA
Car: 1992 Chevrolet Camaro RS
Engine: 305 T.B.I.
Transmission: 700R4
Axle/Gears: 2.73 Open Diff
TBI (LO3) to TPI (L98)

I want to do this swap sometime in the summer but since they are different methods of fuel injection how hard would this be? I would like to have an idea of what I am getting into before I actually do it. = )
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Old Jan 20, 2008 | 12:17 PM
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Re: TBI (LO3) to TPI (L98)

im in the process of doing the same swap right now. i have a speed density tpi setup from a 91, and so far all i know is that you have to change the ecm, harness, fuel pump, and possibly the throttle cable? im not running ac or anything. im sure theres more that i havent found yet though. i plan on having it done by late this week, so ill let you know if theres anything else i did.
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Old Jan 20, 2008 | 01:18 PM
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: TBI (LO3) to TPI (L98)

There is a basic tech article on this website, as well as several other threads going from other members who have done the swap.

Good luck! You'll enjoy the new found torque when you stomp on the pedal.
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Old Jan 21, 2008 | 02:18 PM
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From: Glen Mills, PA
Car: 1992 Chevrolet Camaro RS
Engine: 305 T.B.I.
Transmission: 700R4
Axle/Gears: 2.73 Open Diff
Re: TBI (LO3) to TPI (L98)

yea if you could please keep me updated and let me know how much it ran ya
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Old Jan 26, 2008 | 10:16 PM
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From: Glen Mills, PA
Car: 1992 Chevrolet Camaro RS
Engine: 305 T.B.I.
Transmission: 700R4
Axle/Gears: 2.73 Open Diff
Re: TBI (LO3) to TPI (L98)

any updates?
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Old Jan 28, 2008 | 12:23 AM
  #6  
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Re: TBI (LO3) to TPI (L98)

yeah!! i got her fired up today. first rotation of the crank and boom, runs like a top. it was a very straight forward swap. the worst thing was dropping the fuel tank to change the pump. ill post up some pics very soon. too bad it snowed like an s o b though! i wanna try her out.
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Old Jan 28, 2008 | 03:12 PM
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robster66's Avatar
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From: Glen Mills, PA
Car: 1992 Chevrolet Camaro RS
Engine: 305 T.B.I.
Transmission: 700R4
Axle/Gears: 2.73 Open Diff
Re: TBI (LO3) to TPI (L98)

Could you tell me what you had to do? = D
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Old Jan 28, 2008 | 09:24 PM
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Re: TBI (LO3) to TPI (L98)

well, i had to change the fuel pump... and the ecm and harness. and thats about it haha. make SURE you get the flywheel with the motor when you buy it. i made that mistake i changed the clutch and pilot bearing and t.o.b. while i had it apart. im having some issues with fuel delivery now. and its a pain in the *** i think my fuel pressure regulator may have bit the dust..
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Old Jan 29, 2008 | 12:55 PM
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From: Hebron, KY
Car: 1992 RS Heritage
Engine: 305 TPI
Transmission: TCI 700r4
Re: TBI (LO3) to TPI (L98)

Did you change the knock sensor? If not, you must. They're different from TBI to TPI and 305 to 350.
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