Quote:
Originally Posted by wdodge45
Hi Robert, I'm still waiting for a call back from Tatum but in the mean time ran across this with concerns.
Guy posted selling his GT-K 650's with .86ar's on a turbo built LSX 434 motor due to the turbos ran out of gas at 20psi at 4800rpm on this street driven 2007 corvette....
With that being said, I'm feeling a little nervous! Here we are hooking up 38" paddle tires in the sand with a car weight of 2700# and I run this motor to 7200rpm.
The guy is changing to ur 76 series size...
Any thought or concerns but hopefully u can see my questions before I buy.....
Bill
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Well as you said before you had to switch to larger turbine housings to keep the boost curve good at the top end and make the top end power without backpressure issue. I don't see any info from that car on what his power goals were or any other limitations. The HP66 compressor is used in a lot of SINGLE turbo kits on LS series motors and for people who do want more power they switch to an HP76 but thats in a single turbo config. Bottom line I don't think there is anything to worry about. Did you look at Ash's post that I linked on the last page? He's running an SBC as well with HP66 compressor wheels and running 6s in the 1/4 mile with little to no lag. Here's a video:
YouTube - willowbank winternationals 2009, twin turbo altered
YouTube - twin turbo sbc altered , willowbank 2009
You might even want to shoot Ash a PM. He's tried a variety of different units on his car (the one in the video) and settles on HP66 compressors. If you want you could always step up to the GT-K 850 or 1000. The GT-K 850 uses an HP72 compressor and the GT-K 1000 uses an HP76 compressor. They also uses a larger F1-68 turbine wheel. The F1-65 will spool up faster (because of size) than the F1-68 turbine wheel but the F1-68 will of course be able to handle even more power. At that point though we are talking in the 2000+ HP range. I still think the GT-K 650s will be great for you. Keep in mind we are already talking about a turbo that is significantly larger than the 60-1 compressors you were just using even with the GT-K 650.
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2004 Nissan Titan SE KC 4X2: AEM Brute Force Intake, NISMO Exhaust, NISMO Shock Kit, PRG Upper Control Arms, PRG Sway Bar Endlinks, PRG LCA Spacers, Eagle Alloy 17x8, Nitto Terra Grappler 295/75/17, Alpine iXA-W404, Apline Power Pack, Apline KCE-400BT, Alpine Imprint, Alpine Type-R Door Speakers, US Amps USA-400, JBL GTO0804
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