roush cars in stock and super stock

Tim Kish · 09-12-2008, 03:52 PM

To implement boost control as a tech control is actually an unfair regulation on a forced induction engine. As boost is a measure of manifold back pressure you can increase the boost level in the manifold by changing the cam profile - LESS Lift or duration. You have made no changes to the blower/turbo at this point but the boost gauge reading has changed. Relative to performance this may/may not help, higher manifold pressure yields higher airflow velocity but also labors the charger more which creates added heat - its a function of the engine combination. My point is it is not directly indicative of power output. I am working on an application now that runs 8psi boost on the low power variant and 5 psi boost on the high power variant. Exact same supercharger system, drive ratio, etc - the only hardware difference is the cam profile. The low boost version makes 50Hp more.

A regulation on boost level would be no different then to limiting all NA applications to the factory rev limit (Nobody runs higher RPM than the OEM do they?)

09-12-2008, 03:52 PM	#19
Tim Kish Member Join Date: Nov 2003 Location: Kalamazoo, MI Posts: 281 Likes: 2 Liked 11 Times in 4 Posts	Re: roush cars in stock and super stock To implement boost control as a tech control is actually an unfair regulation on a forced induction engine. As boost is a measure of manifold back pressure you can increase the boost level in the manifold by changing the cam profile - LESS Lift or duration. You have made no changes to the blower/turbo at this point but the boost gauge reading has changed. Relative to performance this may/may not help, higher manifold pressure yields higher airflow velocity but also labors the charger more which creates added heat - its a function of the engine combination. My point is it is not directly indicative of power output. I am working on an application now that runs 8psi boost on the low power variant and 5 psi boost on the high power variant. Exact same supercharger system, drive ratio, etc - the only hardware difference is the cam profile. The low boost version makes 50Hp more. A regulation on boost level would be no different then to limiting all NA applications to the factory rev limit (Nobody runs higher RPM than the OEM do they?) __________________ Tim Kish 3032 SS/GS Last edited by Tim Kish; 09-12-2008 at 03:56 PM.