HorsepowerX

I have a 1993 coupe that I bought back in 1995. It was originally built by Lido at Alternative Performance in Michigan and had a Vortech Si-Trim. I ended up blowing the motor due to a faulty ignition retard and bad fuel. I ended up selling the blower to pay for a new motor, because it was my daily driver.

(10yrs later) Today....I received my brand new Vortech V-3 Si Trim supercharger! Everything is still the same set up as before except for the 24lb fuel injectors and GT-40 block. The original set up from Alternative Performance was the Si Trim with a 70mm Mass Air meter calibrated for 24lb injectors, but had 42lb injectors. It ran fine with the blower, but bad with out it. I ended up buying 24lb injectors for running without the blower.

My questions are: 1) What size fuel injectors should I buy, 2) what fuel pressure/timing should I start with, 3)do I need to use the FMU, and 4) does anyone know a place in MI that does tunes for a reasonable price and actually answers the phone?

The original set up didn't have an FMU. I will eventually take it to a shop for a tune, but I was hoping to be able have everything ready to go, which includes injectors. I appreciate any feedback.

My mods are listed below (Bare with me this is from memory and its been a while since I've listed everything)

GT-40 block bored .006 over (new)
GT-40 iron cast ported heads
Cobra Upper and GT-40 Lower Ported and polished (port matched)
65mm Throttle body
70mm Mass Air meter calibrated for 24lb injectors
1.6 roller rockers
E303 cam
155lph in tank fuel pump
T-Rex Fuel pump

There are other cooling and suspension upgrades.

The original set up didn't have an FMU. I will eventually take it to a shop for a tune, but I was hoping to be able have everything ready to go, which includes injectors. I really really appreciate any feedback!

mjr46

stay off the boost without a tune......set base timing to 10 degrees...btdc........or if you really wanted to you could pull the spout out and lock timing at 16-18 total conservatively to start...........I'd run a min of 42lb inj and that really depends on how much boost you'll be running and ditch the 155 lph and t-rex and go with a 255-340 lph in tank........do not use a FMU.........best way is get a tune for the s/c on a dyno and run at least a 80 mm maf.....you'll peg the 70mm if you want to run a decent amount of boost.....sct chip runs around 250-300 ish and whatever tuner charges on top of that to tune........also is it non intercooled?? or will you run an intercooler??

HorsepowerX

Thanks for the advice. Its a 255lph. The T-Rex is 155. Sorry, its been a while since I've focused on the fuel system. It ran great back in 1995 with the current set up + 42lb injectors and supercharger before I messed up the ignition/timing retard. Trying to get that back. It is not inter-cooled at the moment. Sounds like a need a professional tune. Thank you again