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Pampered-Z · 04-08-2007, 04:42 PM

Wow! 390HP out of a 305 on 24lb injectors. That pretty amazing. The FMU must be raising FP to 70-75 PSI in oder for those injectors to support that HP. You might want to get a scan and see where the duty cycle of the injectors are. I'm thinking you way up there!

You've got a goot handle on your setup. If you don't have something pulling timing out I would suggest running high octane!

500HP is a good target, and about the max the little P600B can make. I'm running what are 15lb pullies which put the max RPM of the engine at 6400. Having a front mounted 3-core intercooler and a 383 means the SC has to work hard to fill all the volume, and as such I only see 10PSI on the gauge at around 5200 then boost starts to drop as the little SC can't feed my set-up. I made 470 RWHP with a bad tune, so I think 500RW is the max. I'm running the single Racetronics pump and harness and see no drop in fuel pressure at all and duty cycles are 82% (42LB injectors).

Well If you go with the 255 intank and the external I think you'll have enough fuel. For 500 HP you will need to go with at least 42LB injectors.

Yes, PCMforless can do the tune. If fact of all the local and other tuners Alvin was the only one that backed up his words with his work! Alvin runs a few SC speed density cars of his own with a 2-bar map and had a base tune for a 355 LT1 that was close to my setup. Alvin sent me the first tune adjusting for 383, 12 PSI, 42 LB injectors, 2 bar map. Car started first try, had a slight flat spot off idle, and was real rich at WOT, but I told him I wanted a safe tune. On TTPs dyno it made 470 RWHP and smoked like a diesel!. I send Alvin a data log of the car with about 10 minutes of scanning from normal driving to a run thru the gears at WOT, and also a copy of the dyno sheet. He made the changes and the car runs amazing! He'll be coming to PA soon and I intend to get him to do a full tune on the dyno, I think the key is getting the timing tables right to match the air/fuel under boost is the key to getting an SC engine to run well and live long.

Once my daughter is out of college I'd like to move up to a D1 or F1 and maybe aftermarket heads and ptu the boost above 15 and shoot for 750HP. But that means upgrades to the entire fuel system, pumps, fuel lines, fuel rails injectors ets. At that point I'll drop the stock ECU, mainly because I have an aftermarket system that has extra functions such as full data logging, two step, being able to turn on a secondary pump under boost and activate alki or nitris at certain boost+ RPMs.

JB

04-08-2007, 04:42 PM	#10
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	Wow! 390HP out of a 305 on 24lb injectors. That pretty amazing. The FMU must be raising FP to 70-75 PSI in oder for those injectors to support that HP. You might want to get a scan and see where the duty cycle of the injectors are. I'm thinking you way up there! You've got a goot handle on your setup. If you don't have something pulling timing out I would suggest running high octane! 500HP is a good target, and about the max the little P600B can make. I'm running what are 15lb pullies which put the max RPM of the engine at 6400. Having a front mounted 3-core intercooler and a 383 means the SC has to work hard to fill all the volume, and as such I only see 10PSI on the gauge at around 5200 then boost starts to drop as the little SC can't feed my set-up. I made 470 RWHP with a bad tune, so I think 500RW is the max. I'm running the single Racetronics pump and harness and see no drop in fuel pressure at all and duty cycles are 82% (42LB injectors). Well If you go with the 255 intank and the external I think you'll have enough fuel. For 500 HP you will need to go with at least 42LB injectors. Yes, PCMforless can do the tune. If fact of all the local and other tuners Alvin was the only one that backed up his words with his work! Alvin runs a few SC speed density cars of his own with a 2-bar map and had a base tune for a 355 LT1 that was close to my setup. Alvin sent me the first tune adjusting for 383, 12 PSI, 42 LB injectors, 2 bar map. Car started first try, had a slight flat spot off idle, and was real rich at WOT, but I told him I wanted a safe tune. On TTPs dyno it made 470 RWHP and smoked like a diesel!. I send Alvin a data log of the car with about 10 minutes of scanning from normal driving to a run thru the gears at WOT, and also a copy of the dyno sheet. He made the changes and the car runs amazing! He'll be coming to PA soon and I intend to get him to do a full tune on the dyno, I think the key is getting the timing tables right to match the air/fuel under boost is the key to getting an SC engine to run well and live long. Once my daughter is out of college I'd like to move up to a D1 or F1 and maybe aftermarket heads and ptu the boost above 15 and shoot for 750HP. But that means upgrades to the entire fuel system, pumps, fuel lines, fuel rails injectors ets. At that point I'll drop the stock ECU, mainly because I have an aftermarket system that has extra functions such as full data logging, two step, being able to turn on a secondary pump under boost and activate alki or nitris at certain boost+ RPMs. JB __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!! Last edited by Pampered-Z; 04-08-2007 at 04:43 PM.