slow-v6

we have a 98 coupe, that is a auto. The car is a stock motor, with ls6 intake, lt headers, full exhaust, and a p1sc with a 425 pulley.. The car has a built z06 rear with 3.90 gear. The car also has a meth kit, and stock pumps with a Kenny bell boosta pump.. Right now the car is on 4-5 psi. Would like to be around 10 psi.. Was thinking of a 3.80 pulley, and perhaps better flowing fuel pumps.

Would my motor be safe with 10 psi? Can my stock pumps, on a boosta pump supply enough fuel for 10 psi?? Would a 3.8 pulley net me 5 more psi? Also when should I think about upgrading to a single inter cooler instead of the 2 small ones??

Milan

If I had to guess I think that pulley would get you 4-5 more psi. I also think you would be okay on fuel but can not promise that. With a good retune I would not be worried about motor longevity.

I would add the LPE pump and racetronix harness into the mix too if it was me.

The dual intercooler design definitely sucks, it would be a good idea to upgrade if you up the boost.

4DRUSH

You have a half dozen or so reputable Corvette shops very near you.

I suggest you pick one or two, have them look at what you got, etc.

robert miller

As always Jay coming thur with the best for a person.

corvet786c

I agree, when I had my car tuned, my tuner said that I was running about 5lbs of boost with a D1SC 4.38 pulley. Well I doubled checked all hoses and fittings and re tighned then some were loose. Now I believe I gained about 2-3 more lbs of boost about 8lbs with a 4.38.
Cars runs great now, just need to get the tranny temps down some.

Blow Torch

Pulley swaps/boost increases are a bit of a guess. I was told a couple of times that 1/4" = approx. 2bs, but never tested to see if it was even close
I run a LPE FP, boost a pump and meth and am around 13lbs and closing in on 800rwhp (wont get there with this P1SC1) and the pressure never dips below 54.
I ran 10lbs and 700rwhp on my stock motor with a great tune and Meth, but have seen them let go with power in the 5xxs. RPM is the killer on the 98 rod bolts.

slow-v6

Thanks for the heads up everyone. The tune is done by Ron Patton, ronster tuning. He is an outstanding tuner.. May get the car in the air, and retighten every clamp/hose before I look to do a pulley swap.

ajrothm

+1

When I had my stock LS6 engine with only headers/exhaust, a 4.38" pulley on a D1sc made 10 psi through the air filter/dongle. 11 psi with the blower open. This was good for 622rwhp(thru the filter/10 psi).


OP, I would check all your hose connections first, I think you should see more the 4-5 psi with the pulley combo you have... Also make sure your blow off valve is sealing well under boost.

THEN go to the 3.8" pulley and retune...

Caveboy

How many hp do you have right now?

BLOWNBLUEZ06@RKT Performance

Motors can break stock. As you increase boost, you increase stresses on them and all supporting parts. I've got a good handful of customers running around making 15 or more psi boost without issue, but they all have been warned that it will last until it will only last so long.
If you want reliability, leave it alone. If you want to play, do your due diligence to make it reliable.
Part of my recipe for making these cars last is to run a good meth injection system and I see that you have one. Make sure it's working properly from time to time and replace/rebuild the pump every 2-3 years. They're not that expensive to replace and consider it maintenance, like an oil change.

reactor2

I'm running a P1SC with a 4.25 along with heads, cam, intake, exhaust, etc. and I see a little more than 6psi at 6k rpm.

PEETYZ

Make sure you have no leaks or belt slip....

I made 10 PSI with 3.85 pulley on my stock 01 ls6 with blower cam and LT headers on a P1Sc-1. Got me 606rwhp/531rwtq on a conservative dyno with no meth. Make sure you have a good intake/filter on there. The DP big mouth is a great choice.

Add the LPE pump and Harness for insurance.

IMO Pros and cons to the intercooler.

Less restriction with the large single but also blocks the radiator and makes it harder to cool down. I would personally leave the dual intercoolers if under 700-800rwhp.

I run the larger twin intercoolers ( most recent design) on my D1SC/Forged 347 still.

slow-v6

Thanks everyone.. When I get back from vacation, I will check for leaks/slip. Not sure on power, but the previous owner went 11.8@118 in it, so I assume it's around 430 rwhp..