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'88 IROC-Z 305 T.B.I - '88-'90 350 T.P.I Conversion

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Old Mar 18, 2003 | 07:15 AM
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CustomCarShop's Avatar
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TBI - TPI Swap Question? Please HELP!

I have read up all the other postings on doing this swap? I have an '88 IROC-Z 5.0 T.B.I. I plan on buying a '88 - '90 5.7 T.P.I Donor car. I kow the basic things to remove off the car, obviously the engine, wiring harness, ecm, fuel pump. Everyone says to go look at the tech article? And theonly Tech Article I see is converting a 90-92 T.B.I.

But what else should I take off the car that I will need for the swap? I have read some poeple have even changed dashboards and even the fuel lines on this conversion?

Could someone give me a full list of every thing I need from the donor car, anyone that has done this Swap that knows any of the little things aswell?

Thanks....

:rockon:

Last edited by CustomCarShop; Mar 19, 2003 at 09:26 AM.
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Old Jun 4, 2007 | 06:45 AM
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IROC BxR's Avatar
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Re: TBI - TPI Swap Question? Please HELP!

I NEED TO KNOW THIS AS WELL, I'm trying to swap my 88 iroc into a 89 RS. What all do i need to swap out? suspension? rear end? please help
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Old Jun 4, 2007 | 07:26 AM
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Re: TBI - TPI Swap Question? Please HELP!

P.S. how long would it take with proper tools to transfer all the things i need to from my 88 IROC into my 89 RS?
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Old Jun 4, 2007 | 09:42 AM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: TBI - TPI Swap Question? Please HELP!

Originally Posted by CustomCarShop
I have an '88 IROC-Z 5.0 T.B.I. I plan on buying a '88 - '90 5.7 T.P.I Donor car. I know the basic things to remove off the car, obviously the engine, wiring harness, ecm, fuel pump. Everyone says to go look at the tech article? And the only Tech Article I see is converting a 90-92 T.B.I.

But what else should I take off the car that I will need for the swap? I have read some poeple have even changed dashboards and even the fuel lines on this conversion?
Well, this is pretty old. Sorry it was never answered.

Throttle cables are the only other things I can think of.

VATS may be an issue, depending upon the donor & receptor years.

TPI cars tended to have a slightly better suspension & gearing, but changing springs/swaybars/transmission/diff aren't "required".
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Old Jun 5, 2007 | 04:07 AM
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IROC BxR's Avatar
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Re: TBI - TPI Swap Question? Please HELP!

Originally Posted by five7kid
Well, this is pretty old. Sorry it was never answered.

Throttle cables are the only other things I can think of.

VATS may be an issue, depending upon the donor & receptor years.

TPI cars tended to have a slightly better suspension & gearing, but changing springs/swaybars/transmission/diff aren't "required".








okay, but wich parts of those are the same, i was looking at the RS and IROC. WHAT parts are different mechanicaly from an 88RIOC TPI w/ 350 tpi and the 305 TBI 89 RS????
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Old Jun 5, 2007 | 12:32 PM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
ECM, fuel pump.

Everything else you can see, if you've got both vehicles side-by-side.
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