Jason3rdgen

Hi everybody I have an ls1 from a 99 z28 that I'm swapping to a third gen firebird the motor has 170k miles I've slightly rebuilt it. The motor has a high lift hot cam from the ws6 store pushrods and valve springs and I'm gonna use an slp loudmouth cat back on it. I just bought a fast 102mm intake and warr 102mm throttle body i would like some suggestions on what fuel rails to use and injectors . If possible id like to use the stock if there's adapters or something for the stock ls1 rails and injectors. If not some suggestions that arent too expensive would be appreciated thanks!

98CayenneT/A

I think that intake requires aftermarket fuel rails or you can use Ls2 fuel rails.

To use the stock/ev1 injectors I think you also need a spacer kit due to the height of the injectors and where the rail bolts to the intake.

98CayenneT/A

If using stock water pump you either need to use a Ls2 water pump from a Corvette or cut the top bolt ear off the existing stock pump

Jason3rdgen

why do I need to do that? I test fitted it and it seemed fine with a new oe style one?

98CayenneT/A

Did you test fit it with the 102 throttle body on also ?

I have the msd Air Force intake with a 102 tb and the install is similar to the fast 102.

On both the installs few get away without grinding and some need to grind a little and some a lot.

Jason3rdgen

yeah the throttle body is already on it had plenty of room..

Jason3rdgen

do you know where to get the spacer for the injector?

98CayenneT/A

Something like this. You can buy without the rail if you already have one.
https://m.summitracing.com/parts/fst-146021-kit

Jason3rdgen

okay cool that will the stock ls1 injectors be enough for the increased air flow from the intake?

98CayenneT/A

First I would get a second opinion to make sure I gave ya the right part number to run stock ls1 style injectors.
Also if you have a fuel rail already you don't need the one in that kit and I know they sell a adapter kit for much much cheaper without the rail. You can get a Ls2 fuel rail for about $100 used and save yourself some money.

As far as injectors, that is a question you would have to ask your tuner to see how close they are to being maxed out with your setup. Worse case scenario you can order gtp Bosch white injectors that will be plenty for ya. They flow about 40 lbs at 50 psi fuel pressure.
They came on supercharger gtp's and regal's

The injectors can be found at junk yards for cheap or you can order a set of 8 online for around $100.

98CayenneT/A

I am currently running the Bosch 36 lb gtp injectors myself in my setup listed in my sig below.

Jason3rdgen

okay awesome could you send me a link to those please?

98CayenneT/A

This is exactly where I got mine.
http://www.ebay.com/itm/like/1821856...&ul_noapp=true