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Well i just got another 3.4L and I wanna do a fully built turbo. Before i send it out to a machinist I need some questions. To start off what compression ratio is recommended if my goal is around 400HP. Should I go lower than stock compression ratio?
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Pontiac Fuel For Your Soul! -
Id probably use a good 3400 top-end before doing anything else. Compression should a good 9.0:1. (no reason to any lower than that). Also, keep the quence at around .050. (.045 is nominal, but I like to leave a bit of clearance for rod-stretch.) Your stock rods are actually pretty decent, just upgrade your rod-bolts. ARP L19 rod-bolts are overkill, but they can be had cheap enough to go ahead and use them. A good set of ARP head and lower-end studs wouldnt be bad either since your going through the trouble of having it machined.Last edited by Driver_10; 11-16-2010, 07:46 AM.Took a break from working on the car. Got some better tools, got a better shop, got a better job... Its time to burn metal! -
I'd agree. For high boost- 8.5:1, medium boost- 9:1, and low boost- stock compression. I think I went with 8.75:1 or 9:1 on my pistons.
Tim1995 Z34 - T04E "60" trim, 42.5 lb/hr injectors, AEM WBO2, FFP UD&DB, 3" exhaust, 2800 stall, shift kit, tranny cooler, Powerslot, Hawk HPS, rear disc conversion, KYB, Eibach, HMS F&R STB, Fittipaldi Force 18" wheels, big stereo, lots more coming eventually...
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