Worth 8 bucks?
#22
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I don't know, but wouldn't think the resultant ocillation in fuel pressure would be very fun. Maybe a simple pop vent to atmosphere isn't correct for the application. It would have to be coupled with a second bleed. So the resultant would be a pressure rise with boost that progressively reduces its rate of rise. So then there would be two additional adjustments: the pressure to begin the venting event, and the rate of bleed at the vent. Now it should work. ?
#31
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So let us assume that we set our stage 1 needle valve bleed to rise fuel pressure at the rate of 8 psi to every 1 psi of boost pressure. Let us then assume we set our pressure relief to open after 4 psi of boost pressure, and we set our second needle valve to increase fuel pressure at the rate of 3 psi to every 1 psi of boost with any boost over 4 psi
Result of above assumptions:
1 psi boost pressure --> +8 psi fuel pressure
2 psi boost pressure --> +16 psi fuel pressure
3 psi boost pressure --> +24 psi fuel pressure
4 psi boost pressure --> +32 psi fuel pressure
STAGE 2:
5 psi boost pressure --> +35 psi fuel pressure
6 psi boost pressure --> +38 psi fuel pressure
12 psi boost pressure --> +56 psi fuel pressure
Bear in mind my assumed rates are arbitrary, so observe the data as conceptual/hypothetical, but not necessarily correct for the application.
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Last edited by Ben; 01-02-2007 at 11:20 AM.
#32
i got the safc after trying to run some 460's for all my dyno runs so far i haven't had one. it did help me on top end and driveability though. just not with the 460's. i first stated doing the mbc fmu tweak with my low impedance 305's that i ran for a while and it slowed the fp ramp up becouse my injectors where doing silly things being the wrong impedance and all on boost transition.