Mar 29th, 00, 05:04 AM
i have a 88 iroc with a zz4 350 crate motor, i put the stock tpi on this motor and it runs good but runs alot slower then stock motor. i know this motor is made for a carb but what will i have to do to put a carb in it. My main problem is the fuel pump. i cant put a manual fuel pump cause of the oil cooler lines.Just wanted to know what i would have to do to the lines and stuff. If anyone has done this please let me know Thanks
Mar 29th, 00, 08:36 PM
Why not go with an electric fuel pump made for street carb'ed motors. i think summit sells a carter one for @ $50. street is 5psi, street/strip is 7psi, probably better for your application. i have one for my 385, but haven't had a car to put the darn motor in yet so it will sit along with the 780 holley for now.
part #'s are:
CRT-P4070 5PSI $52.95
CRT-P4594 7PSI $48.95
Mar 30th, 00, 03:37 AM
did the car originally come with the 350?
Mar 30th, 00, 07:36 AM
I don't know the laws in your state but I can tell you that in most states what you are doing will prevent you from getting the car stickered (registered) and may even prevent you from selling the car to someone else until it meets state requirements again..
With that said further reason to not do what you are attempting is that you will have to drop the tank and remove the in-tank electric fuel pump before you can add another pump. Also your check engine light will be permanently lit. You will have to change distributors to a non computer controlled version because the computer will not know what to do with the timing once the fuel injection connections are terminated. I would highly recommend that you not do this to this car. If you decide to do it anyway, retain every little piece that you remove because chances are you will end up needing it again unless the car goes to the junk yard (probable) in which case you won't need any of it. One other thing, be sure to wrap the wiring harness remnants up so that they are not damaged by hot items. You can probably sell the on board computer, fuel injection system and wiring harness to someone with an older car that wants fuel injection. You would be better served by investing in the individual pieces to make the fuel injection support the motor that you have i.e; Larger runners, larger lb. per hour injectors, adjustable fuel pressure regulator, after market chip. Again, you will make more problems then you will solve by going to a carb. Just my .02
Mar 30th, 00, 01:50 PM
I agree with the above. You can modify your tuned port intake with larger injectors runners, and even opening up the airbox. I know you can have a custom made chip made for your application or make the big jump and buy an Accel or similar system that uses a laptop PC to calibrate it. All the late model boys at the track swear by the injection once they learn how to play with it. (It's kinda like changing jets in the driverseat -while ya drive) Hope this helps-Dan in WV
Mar 31st, 00, 06:39 AM
If the TPI in question was from a 305 then your injectors are to small to provide enough fuel for that 350. Get some 350 injectors and I believe you have to turn the fuel pressure up as well. Oh, a performance chip will be needed or a 350 chip from another IROC. This is what I had to do for an old IROC TPI I had.
May 10th, 00, 08:03 PM
please call a TPI specialties or another costom efi tuner before making such a mistake.you don,t even know how good this can work.
Mar 25th, 01, 02:33 PM
Dont mess around with TPI unless you have a LOT of spare money, and maybe a custom chip programmer available (wether the equipment or a person). For TPI you'll pay a couple grand more for upgrades to get to a carb level of performance all to save a few bucks on gas.
I think its mallory that makes a 3 port AFPR that you can use. I heard it was around 70$. This allows you to use the stock in tank fuel pump so you dont have to d*ck around with dropping the fuel tank.
-> I suppose its obvious I didn't look too
closely at the date... Whoops...
1988 Trans Am Gta
700-r4, 350 tpi
[This message has been edited by x5finger (edited 03-25-2001).]
Mar 25th, 01, 10:34 PM
just unhook the fuel pump and run the fuel through it via an out side pump.it will work.