supercharger problems

jawz12 · 07-05-2002, 02:57 AM

I have an 1990 L-98 motor with a procharger 10 psi twin intercoolers. I cracked the pistons in the engine. I am having the engine rebuilt and inverted forged pistons and the compression lowered to 9.2. Also adding a cam to fit the specs: long tube headers, ported heads and intake, new timing chain, lifters and SLP runner tubes. I already have the MSD ignition. Can anyone give me a ball park on performance this engine will produce? HP/torque??? What other modifications should I look at in addition to these? Any help is appreciated!

Mo_Bandy · 07-05-2002, 05:28 AM

Jawz...

I'd look into your fuel side of things.. auxilary fuel pump if you don't already have one.. an FMU or a superpumper to increase your fuel pressure under boost your spark advance... and keep an eye on detonation, with the intercoolers that should resolve alot of your problems also with your lower compresion ratio...

avery ROUGH cal would be...

14.7 +boost /14.7 =1.68 pressure ratio

you horspower before the supercharger... say 245 * 1.68 = 411
I would say that is at least a minimum... and does not account for intercooler losses.. blah blah bal.. or gains

hope this helps...

Mo

jawz12 · 07-05-2002, 01:15 PM

Thanks Mo! I have an FMU and have made sure to have the ratio checked.. I am looking forward to seeing how it runs with the other modifications I have added when I get it back!!!!!!!

AKS Racing · 07-05-2002, 01:18 PM

I used to run a similar combo as what you have described. Some differences:
SuperRam vs. SLP Long Tubes
288/288HR12 vs. no specs provided
AFR195RR vs. no head work?
58MM vs. 48MM?
11.2:1 vs. 9.2:1
7.5 psi @5800 vs. 10 psi @????
fuel system mods vs. ???

The previous combo made right at 500 RWHP. Will your new combo, with better breathing make 10psi boost? With more detail, someone should be able to more closely estimate the new power.

I would estimate that individuals who bolt on a P-600B or a P-1SC to a stock motor would see an additional 100-140 flywheel HP. This would equate to approx 385 FWHP or somewhere around 330 RWH.

Aaron

Flame Red · 07-05-2002, 06:53 PM

Aaron is pretty darn close with his esimate:

Quote:

I would estimate that individuals who bolt on a P-600B or a P-1SC to a stock motor would see an additional 100-140 flywheel HP. This would equate to approx 385 FWHP or somewhere around 330 RWH.

I have 1.6 RR and headers and ran 317 RWHP last dyno.

gcrouse · 07-07-2002, 06:18 AM

Well I'm similar to your setup, but mine's a 383 with AFR 190's and big valves. Compression is 9.2 and I see 8.5psi boost at the manifold.

Intake: Procharger P600B, 2 core intercooler, 52mm TB, SLP siamese runners, ported plenum / lower intake
Fuel: 36 lb/hr injectors, Walbro 340 pump, 50psi pressure, no FMU
Cam: 215/230 @114LSA with .485/.510 lift
Ignition: MSD-6al, 53kV street/strip coil, Jacobs 9mm ceramic boot wires, NGK V-power FR4 plugs
Exhaust: Hooker 1-3/4" full length headers, dual 3" cats, dual 2-3/4" pipes

So mine does 435 rwhp and 506 rwtq; roughly 525 hp / 610 ft-lbs at the crank. Long live the long tube runners! Of course it falls flat on it's face at 5000rpm; really needs a SuperRam...