Turbo Bob

We are currently swapping a GM crate LS3 376/525 HP engine into my 1998 Corvette. Anyone know what to do with the return line for the fuel rail? Thanks.

tupeloC5

Not sure about the return line, but I'd like to ask what you've done about the 58 vs 24 tooth reluctor problem?

CactusCat

I've done the same thing to my 98. Put in an LS3, almost 700 to the rear wheels (on 7.5 psi boost, LOTS of room to up the HP). I sent the crank out and had the 58 replaced with the 24. Easy peasy. I continue to use the return fuel line as its a better setup than the single line for high HP cars. I am not using the stock intake however. I'm using a FAST 102 with the FAST fuel rails and an LS2 TB. Added my own regular and just kept the return line so it's basically pretty well custom, just bigger lines to carry more fuel to feed the beast. My LS3 came out of a 2010 Camaro that was built with all forged stuff. Works very well.

Turbo Bob

Lingenfelter makes a 58x to 24x conversion box that is plug and play. No issues. Works very well on my 2001 Firebird LS3 conversion.

zone-7

That's awesome and especially so, if you're running the 98 ECU !

Turbo Bob

Well all I can say is it pays to have good friends. Here is the answer to my question. The 3/8" male tube on the filter/regulator is the line from the pump. The 5/16" male tube is for the return line that has to be shortened. The female fitting is the line that goes to the fuel rail. VERY IMPORTANT. After all is done, hook up battery and cycle key. Do Not Start. Just so the pump primes. Cycle two or three times so the pressure builds. Then check for any leaks.

CactusCat

I upgraded the 98 computer to a 2002 computer. Faster cpu, easier to tune. PITA moving all those wires though....

Turbo Bob

Cactus, Great idea upgrading to a 2002 computer, but repinning all those wires though really sucks. Going to stay with and use the 98 computer.

Eric Fischer

Bob did you put a cam in this motor?

Turbo Bob

No cam swap Eric. Comes with a GM ASA cam.

C5 Pete

Sounds like a good project, Bob.

Before you completely poopoo the idea of a PCM swap, do a bit more research. It seems like a daunting task, but it shouldn't be that bad and just requires some patience.

Turbo Bob

Will do Pete. Thanks.

CactusCat

Here's you some food for thought...
https://www.corvetteforum.com/forums...-corvette.html

CactusCat

And if you want to know the pinouts...here you are

Turbo Bob

Thanks for the info Cactus. Appreciate it.

Eric Fischer

I am not sure a PCM swap is warranted in this situation. Why go through all of the trouble, when in this case, the 98 PCM will handle the job just fine?

Turbo Bob

I agree.The 99-04 PCM is a better PCM overall, processes faster, and has more parameters but still a lot of work.