Greddy Profec B Spec II boost question

[xero1]

wih a Greddy Profec B Spec II boost controler can i set the boot and leave it at 10 psi?

[otterman]

Yes. You have two settings. One is low and one is high. On the low setting you set it at whatever you want the car to run normally, like while driving through town. The high setting you set to what you want to race at. You can switch between high and low just by pressing a button.

So you can set your high boost to 10psi and it will stay at 10psi. It's kind of difficult to learn how to set it though because it's read out in % and not in psi but once you figure it out, its not too bad. Plus once you reach the boost level you want, you'll never have to reset it because it saves the information.

Hope that helps.

I'm running 8psi (stock) on low and 13 on high with the stock T25 turbo.

[xero1]

my set boost is at 0% on LO and HI. My limiter is set at L.99%. To adjust the limiter the manual said "while in boost display, press the set knob 4 times to show the current LIMITER setting," the only way i can get to the limiter setting is by pressing MODE switch 4 times, is this correct? my goal is to have 10 psi of boost in low mode, 12 in high. i have a s15 t28 turbo.

[S2R4200_ONEVIA]

Just get a MBC Saves me alot of headache

[xero1]

i already have a Greddy Profec B Spec II

[DrifterProdigy85]

setting the boost on the B Spec II is easy. All you do is turn the knob while on the display screen to increase the Set Boost. Then once you find the boost you need, use the Gain to level out the boost some. The Start Boost feature isnt needed. I set the warning to a certain pressure amount. I dont use the Limiter feature. Hope this helps.

[otterman]

I thought start Boost effects the spool up time? Plus when I forgot to mess with my start boost time, my boost jumped all over the place when I was holding high boost.

[S2R4200_ONEVIA]

I had one to, I sold it in favor of a MBC. Best thing I could have done

[xero1]

i found the problem, on the selonoid i had the wasegate line in NC. i swaped the fitting to NO and the boost controler works ok.

[DrifterProdigy85]

Start Boost is to sopposadly help spool up time but it comes with a price of On and Off Throttle Responsiveness. I leave it a 0 because if im drifting it makes the turbo less responsive. If your wastegate works the way its sopposed to you dont need the setting anyways. Set Boost and Gain are the only features you need to Set and Control boost.