Sideways on the dyno
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Joined: Oct 2000
Posts: 9,033
Likes: 21
From: South of the pier, Huntington Beach, CA
Picked up a 4 BAR GM style MAP sensor. It will just swap, when I get to the tuners, with the GM 3 BAR I am running now.
Boost-A-Pump is in and set to 17.5 volts with 3 psi boost activation.
I just realized the boost figure is not correct. It was 1.85 BAR and that calculates out to 26.8 psi. 
My map sensor is a 3 BAR so must limit boost to less than 29 psi.

My map sensor is a 3 BAR so must limit boost to less than 29 psi.
I'm running the V2 w/ 3.8 pulley, which is about 15psi at 51k rpms on the S/C. If you go up to 60k rpms, that is about 20% increase in rpms, that would seem like it would put out about 20% more than the 15psi.
Does the psi increase exponentially at the higher revs?
I'd love to be able to push my S/C this high! Can you provide some insight for a noob like me?
Thanks for your time!
Well looks like I'm doing 23.5psi at an impeller speed of 60k on a 78* humid day. Stock header, 63mm test pipe and HKS dual catback. Were your outside temps lower when you squeezed 25psi @ 59k? With your open exhaust I figured you would have less restriction than me.

hvAlfaWant_S2000, here's the impeller speed calculator: http://www.vortechsuperchargers.com/page.php?id=33511
All you guys running regular S trim blowers should keep in mind that sideways and I are running T trims. I would say that it isn't safe to spin the S trims this fast. You can upgrade to the SI trim for about $750 from Vortech. That's the same blower as the Novi 1200 and will allow you to get ~500whp.

hvAlfaWant_S2000, here's the impeller speed calculator: http://www.vortechsuperchargers.com/page.php?id=33511
All you guys running regular S trim blowers should keep in mind that sideways and I are running T trims. I would say that it isn't safe to spin the S trims this fast. You can upgrade to the SI trim for about $750 from Vortech. That's the same blower as the Novi 1200 and will allow you to get ~500whp.
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JohnChan
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