Hey guys, I have an 87 Trans Am with the LG4 305 and Quadrajunk carb. The carb is junk, everything in/on it needs replaced (TPS, MCS, float, etc ...)so I said "To hell with it" and am swapping to TPI. Now a few questions. My TPI stuff is coming from an 86 IROC. Am I going to have to get pulleys off of a TPI car, or will mine be ok? and what about the fuel pump? The tank is going to be a PITA to get out, so is it necessary to put a pump in the tank, or can I mount on on the frame somewheres? Whats my best option for driveability and performance? And while I'm in there swapping, anything I can do to get a little more power?? As for a wiring harness, anyone have any idea who to go with? Painless? TPiS? S&P? I think thats about it for now, but if anyone has any more pointers, I'm open to hear em! Thanks guys.

Brian

 

I did the exact same swap, but I used a '85/'91 hybrid for the swap. (Hybrid as in: '85 TPI, '91 computer, harness) I used Painless wiring and don't reccomend for what you intend to do.

Personally, I would mount the fuel pump in the tank. You will have to locate a TPI/TBI sending unit, the pump won't work on a carb sending unit. This is the route I went, and if I had to do it again, I would still do it this way. I also bought used fuel lines.

As for things to do while its apart, I did many of the things in my sig while it was apart (byapss TB, ported plenum, AFPR, etc...) My "LG4" has a best time of 14.99 @94 since my conversion and other goodies.

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'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors, Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE