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May 30, 2016 | 05:11 PM

racerx_72

Thread Starter

Instructor

Joined: Jan 2008

Posts: 227

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From: Frisco TX

Boost question

I have a YSI with a 3.0 pulley on it and a IW 10% over drive. I'm only seening 14 pounds of boost also on belt slip at all. Dose this sound right?

May 30, 2016 | 05:13 PM

schpenxel

Race Director

Joined: May 2004

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From: Raleigh, NC

St. Jude Donor '15

What engine/heads/cam/exhaust?

May 30, 2016 | 05:26 PM

racerx_72

Thread Starter

Instructor

Joined: Jan 2008

Posts: 227

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From: Frisco TX

It's a 427 with Trick Flow 260 heads, not sure on the cam kook 1 7/8 header and X pipe

Last edited by racerx_72; May 30, 2016 at 05:28 PM.

May 30, 2016 | 06:51 PM

realcanuk

Le Mans Master

Joined: Apr 2011

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From: Montreal

St. Jude Donor '13

It seems low to me but hard to know since every combo is different. For comparison similar setup makes 19.5lbs on my 402 with 245 heads.
I'd expect your bigger engine to make a bit less, but not sure it should be 25% less.

May 30, 2016 | 11:47 PM

Unreal

Team Owner

Joined: Nov 2007

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From: Gilbert AZ

Boost leak check, check the gauge, check for restrictions, and double/triple check for belt slip. Everyone says no slip but I've rarely found that to be true.

May 31, 2016 | 02:34 AM

C5Natie

Safety Car

Joined: Apr 2007

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From: SoCal CA

Just for comparison I have a ls3 with a ysi on a 3in pulley and a 10% OD crank pulley. I'm seeing 18psi. I would expect your setup to maybe see a little less boost but idk about a 4psi difference. I would check for boost leaks too.