[MIAPLAYA]

Originally Posted by matt55

A properly sized one .......

Big turbo VS small turbo , yes bigger is more efficient so you get a cooler charge, less back presure and can tune accordingly , but who is going to strap an 88mm on a stock 3.6 ?


Turbonetics made 650 Whp ? or 650 flywheel HP , Ive not seen it in the thread .


Lets play a game , lets say to X 2 WHP you need X 2 the atmosphere , 14.7psi
I would say to go from 234 to 379 you need about 9 psi


234 whp(your stock) X 1.62 = 379whp (with turbo 8 psi , tune , exhaust?)
14.7psi (1bar , an atmosphere at sea level) X 1.62 = 9.1psi ("-" 14.7psi for the atosphere)

Pretty close huh ? and if your stock #'s had a tune and was 240whp and 8psi it would come up with 377 whp . a 54% gain or 54% X 14.7psi = 8psi


So I still say to get +500WHP on a stock Camaro 3.6 DI you need at least 15psi or close to it , +/- , you milage mat vary , no $ back guarantee , dang its close enough for the internet

Bigger is more efficient at higher pressure ratios sure but not at the low end of the pressure ratio portion of the compressor island. The bigger wheel is simply larger thus the mass flow rate at a given pressure ratio is higher resulting in larger amounts of air at lower pressure ratios. I'm not recommending ANYONE strap an 88 mm compressor wheel to the V6 Camaro. That turbo would be horribly oversized and at the surge limit at anything below peak pressure ratio. Turbonetics initial tuning is putting that car at 650 WHP at 9 PSI on 91 pump gas yes. That is the SS of course so its a completely different motor. The V6 Camaro motor (aside from being a DIS) is similar in displacement to the VQ35DE. And while the flow profiles are quite different I'm sure I'm willing to bet the Turbonetics GT-K 650 would easily flow enough for 500 WHP with low back pressure as a SINGLE unit and at closer to 10 PSI. I'm not sure I understand your math. Making the leap to say you need 14.7 PSI above atmospheric to double your horsepower output is a stretch I think. I've seen several motors (Nissan and non-Nissan) make double their horsepower at under 14.7 above atmos. There's just too many other factors involved including Ve, flow profiles, cam profiles, etc. By the way I found my dyno sheets from my Z. It made 234 WHP BONE STOCK and 390 WHP at 9 PSI. That a 160 HP gain at 9 PSI of boost. Of course this isn't a thread about the VQ35DE. That's a completely different story. I'm willing to bet with a reasonable sized single turbo unit you could make 500 HP or very close to at at under 14.7 PSI above atmospheric. Twins is obviously a different animal.