pulley change, down on boost, and reading logs questions, belt slip?

[andrewtac]

How do I diagnosis this? I did put on a bv57 since changing pulleys.

Not a BOV issue. Pressurized from the throttle body connection to super charger intake. At first the BOV was leaking, but the reference line was to atmosphere. Once I plugged the reference line into the same pressure line the BOV sealed. Checked for boost leaks, none.

Ran the car last night with the 3.375 pulley, fat car 4145 lb, mph was consistent 140, so perhaps it is making the power it should and I am chasing something that doesn't exist. I did review videos, and it was 10-12 psi in the peak.

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[engineermike]

Nice mph. What power did it make on the dyno?

 

[andrewtac]

Nice mph. What power did it make on the dyno?

with the 3.6 pulley 776; a little less with the 3.48 pulley, but the weather was horrible that day, the drop in power is what got me going down this rabbit hole

 

[engineermike]

That’s a useful data point. 775 rwhp will get you about 140. Thanks for that.

 

[andrewtac]

That’s a useful data point. 775 rwhp will get you about 140. Thanks for that.

DA on the last pass was showing 1393'
Interesting, it made 776 with the 3.6 pulley, down to a 3.375 figured it should make more.

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