07-14-2018, 11:06 AM
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#1 (permalink)
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A True Z Fanatic
Join Date: Apr 2017
Location: So. Commiefornia
Posts: 6,382
Drives: 2014 Nismo Gunmetal
Rep Power: 2684376
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Quote:
Originally Posted by G3RSTY7
Yea I’m talking about the SC input pulley being smaller. Serpentine side jackshaft you want smaller for more boost (so 2.75” for 9lb vs the 3something” 8lb), bigger on blower side jackshaft (his is 3.47) and then small on actual input shaft (i guess he’s made 2.85” somehow work). Don’t try to duplicate his numbers though he’s pushing like 17psi on a built block. It amazes me that you’re pushing 586whp on 12psi and he’s barely to 700whp at 17psi. You’re sea level maybe Oklahoma is a couple thousand feet but still, crazy! He must have the sur-grip on his 2.85” though that sounds like it would be slip city otherwise I don’t know why more people would put on a smaller serp side jackshaft pulley with bigger idler pulley to take up slack when they could just replace the SC input pulley with a really small one. Guess i’ll order the 3.15 and go from there
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Sounds like we're on the same page. I have a 3.47 jackshaft sc side that I sent into 928 for their sur-grip coating. When my car goes back into Seb I'll have him install it to see what psi it gives me. I don't want to duplicate what Evan has done but I would like to see a couple more psi. I'm not too concerned about too much boost as if one of the things we're going to try works then I'll be able to dump excess boost which I'll need to do when I switch to my 91 tune.
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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
750whp/700ft.lbs
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