Topgunz - air to air upgrade

redondoaveb

This is a new 91 tune. I was making 586 on e85 and 471 on 91 @13psi with just the 9 lb pulley, the 2.85 pulley and the Si wheel.

This set up is the 928 wheel, 2.85 sc pulley and 3.47 jackshaft pulley @ 14.4 psi. And I only gained 1.5 or so psi by adding the 928 wheel and the 3.47 jackshaft pulley.

More boost, loss of power. The way the power and torque drop off just doesn't look right.

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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

redondoaveb

I think I might have an idea what my issue is. The V3 is rated at 52,000 rpm. With my current pulley set up, my sc is spinning at 66,000 rpm. I'm running the turbo guard screen and have an unresticted intake so I know it's not a restricted intake issue. It appears that it might be that the volumetric efficiency is dropping off (air cfm in vs air cfm out).

I'm going to call vortech on Monday and see if they can confirm my suspicions.

I want to give a big thanks to another forum member "Z"en for explaining the basics of volumetric efficiency to me.

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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