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oldman · 08-05-2023, 05:57 PM

Procharger stage II intercooler boost is 7 PSI, I personally think that is my dependable limit. Defined by me as 50% chance to hit 100k miles. So 7 PSI, but boost is an addiction and what is a PSI here are there. I'd upgrade the injectors and pump. Don't fool yourself boosted cars don't fail in general because of oil issues, they fail because of heat and heat tolerance. so things like autox and road racing is a lot harder on boosted cars. drag racing can fail things like drive and axle shafts. Since this discussion is all shades of grey, I you want reliability and that would me less boost is better, for more power get rid of pumping losses by doing LT headers or front cat delete. This will actually lower you boost a little (boost is a measurement of restriction).

So 7 PSI kit, headers, LT4 pump and injectors, 6.5 actual PSI never open the hood.

Can more boost be done for less money? Sure but there is a hit on reliability, GM the guys that have to offer a warranty did a whole lot to this engine for 650 reliable HP, so we all know what GM thinks.

08-05-2023, 05:57 PM	#2
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	Procharger stage II intercooler boost is 7 PSI, I personally think that is my dependable limit. Defined by me as 50% chance to hit 100k miles. So 7 PSI, but boost is an addiction and what is a PSI here are there. I'd upgrade the injectors and pump. Don't fool yourself boosted cars don't fail in general because of oil issues, they fail because of heat and heat tolerance. so things like autox and road racing is a lot harder on boosted cars. drag racing can fail things like drive and axle shafts. Since this discussion is all shades of grey, I you want reliability and that would me less boost is better, for more power get rid of pumping losses by doing LT headers or front cat delete. This will actually lower you boost a little (boost is a measurement of restriction). So 7 PSI kit, headers, LT4 pump and injectors, 6.5 actual PSI never open the hood. Can more boost be done for less money? Sure but there is a hit on reliability, GM the guys that have to offer a warranty did a whole lot to this engine for 650 reliable HP, so we all know what GM thinks. __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.