Engine SwapEverything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.
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The Lt1 is from a 94 vette, it is in an 89 v6 firebird. I installed the Racetronix in-tank fuel pump and harness, which takes power directly from the alternator, however the painless wiring harness has a grey wire which is supposed to connect to the fuel pump. Do I still need the wire from the painless kit?
__________________ 87 Formula 5.0 carburated: edelbrock intake & matching cam, Be Cool radiator, 160 degree thermo, TES hedders, high flow cat, Dynomax exhaust, Accel coil...and a bunch of other stuff
2001 Suzuki GSXR750: Harris rearsets, Woodcraft case covers, Hypertech PCII, TRE, Pair Mod, Yoshimura titanium dual outlet Tri-Oval, IRP frame and swingarm sliders--crashed twice and still going strong!
89 2.8 Firebird which is in the process of having a 94 Vette LT1 and 4L60E installed
left to complete:
wiring (small stuff)
driveshaft
exhaust installation
guages
hasn't started yet!
I'm not quite understanding what you mean by"takes power from the alternator". Your fuel pump will need to be switched on by the PCM. The output from the PCM "turn on pump" signal will drive a relay which in turn powers the fuel pump.
__________________ 1990 Camaro RS LT1/4L60E
Flowmaster American Thunder
3.42 Zexel Torsen rear
etc, etc, etc, etc. Pic's of my ride Spec's.
Originally posted by cd90rs I'm not quite understanding what you mean by"takes power from the alternator". Your fuel pump will need to be switched on by the PCM. The output from the PCM "turn on pump" signal will drive a relay which in turn powers the fuel pump.
The Fuel pump doesn't need to be turned on by the PCM, it just needs to be turned on, either by the PCM or by an ignition source.
The best way to run power to the pump is from the battery to the relay and from the relay to the pump, and either have the PCM or ignition activate the relay.
Originally posted by Zepher The Fuel pump doesn't need to be turned on by the PCM, it just needs to be turned on, either by the PCM or by an ignition source.
The best way to run power to the pump is from the battery to the relay and from the relay to the pump, and either have the PCM or ignition activate the relay.
It doesn't need to be ran from the PCM, but who want's there fuel pump to run 100% of the time whenever the ignition is clicked forward one notch? Not me.
__________________ 1990 Camaro RS LT1/4L60E
Flowmaster American Thunder
3.42 Zexel Torsen rear
etc, etc, etc, etc. Pic's of my ride Spec's.
If you use the painless harness it comes with a fuel pump relay in the harness.
if using an intank pump im quite sure this relay will suffice.
if using an Aeromotive external pump then you may want to use that relay to control another High amp relay. then wire the high amp relay from the batt to the pump to ground with sufficient size wire.
If using an external inline pump i suggest using the aeromotive fuel pump controller. this varies fuel pump voltage based on engine rpm, to help keep the pump cool on longer driving conditions.
__________________
95 A.P.E. Z28, 6spd
385cid LT1
550rwhp 650rwtq
Best ¼mile time: 11.41@125mph (In Street Trim, 17's with Nitto's,1.9 60', shifting into 5th)
(Soon) Slicks, Skinnies,TH400 10.??@13?Mph
the painless harness plugs into your stock fuel relay, but the racetronix harness comes with its own relay, so now I have 2 and am not sure which to use...
if I connect the grey wire from the painless harness to the racetronix harness then I will probably disconnect the painless relay and just use the racetronix relay. I will see if it works when I hopefully start the car in about a week...
You have a similar setup to mine. I also used a '94 Vette Lt1. How about some pics when you get a chance. I used the Painless harness and a new/stock relay. It's been working fantastic so far for me.
__________________ 1987 Pontiac Trans Am
Motivated by an Lt1 & T56!!! Gone!
Anyone seen it? The Surgeon General Never Said Nothin' 'bout Smokin' The Competition
