Begi 7psi adjustable short bent arm turbo actuator
#1
Begi 7psi adjustable short bent arm turbo actuator
Has anyone been able to get the 7psi actuator from BEGi to hold more then 12 psi up to red line? I've tried a couple of boost controllers now (Gizzmo MS-IBC and AEM EMS Boost Controller [GM Solenoid]) with no luck. It'll carry 14psi to about 4500 rpm, and then drop to less then 12 up around the 6000rpm point. I know with my friends Greddy setup he couldn't get the stock one past 9psi (would mad boost spike early, and then drop off), and the only way he fixed it was to mount a HKS wastegate to it and then he pretty much had full control with his boost controller.
Thanks folks
Thanks folks
#3
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,039
Total Cats: 6,607
I assume you have connected your boost controller's inlet terminal to the stock nipple on the compressor? Remove it, put a cap on that nipple, and install a new nipple in the pipe between the intercooler and the throttle body.
The dropoff in boost you are experiencing is likely caused by the fact that the pressure drop across the intercooler increases as flow (volumes per unit time) increases. IOW, for a given MAP, flow (and therefore pressure drop) across the intercooler increases with RPM. You are regulating the pressure before the intercooler instead of after it.
I run 15 PSI on a 6 PSI can. Rock solid.
The dropoff in boost you are experiencing is likely caused by the fact that the pressure drop across the intercooler increases as flow (volumes per unit time) increases. IOW, for a given MAP, flow (and therefore pressure drop) across the intercooler increases with RPM. You are regulating the pressure before the intercooler instead of after it.
I run 15 PSI on a 6 PSI can. Rock solid.
#5
I assume you have connected your boost controller's inlet terminal to the stock nipple on the compressor? Remove it, put a cap on that nipple, and install a new nipple in the pipe between the intercooler and the throttle body.
The dropoff in boost you are experiencing is likely caused by the fact that the pressure drop across the intercooler increases as flow (volumes per unit time) increases. IOW, for a given MAP, flow (and therefore pressure drop) across the intercooler increases with RPM. You are regulating the pressure before the intercooler instead of after it.
I run 15 PSI on a 6 PSI can. Rock solid.
The dropoff in boost you are experiencing is likely caused by the fact that the pressure drop across the intercooler increases as flow (volumes per unit time) increases. IOW, for a given MAP, flow (and therefore pressure drop) across the intercooler increases with RPM. You are regulating the pressure before the intercooler instead of after it.
I run 15 PSI on a 6 PSI can. Rock solid.
Thanks folks, will keep updated with results.
#6
Ok well I installed a new reference in the other side of the charge pipes (after intercooler), and there was no difference except it spiked a bit. Then I suddenly realized I'm an idiot, and that the only thing I moved was the point for the solenoid. My AEM uses the MAP sensor to run the car and measure the boost, and it's plugged into the back of the intake manifold.
Anyways, I think it's just a weak wastegate. I changed my boost settings in the AEM to be by TPS/RPM, told it to run max boost in the higher RPM where it was dropping off, and then increased the wastegate duty in that area as well. All in all, it appears to be functioning quite well now, but sort of sketchy in my mind.
NOW, does anyone know what a good replacement for the short bent arm actuator would be? I'm trying to figure out what turbos/cars came equipped with this actuator so I can track down a few.
Anyways, I think it's just a weak wastegate. I changed my boost settings in the AEM to be by TPS/RPM, told it to run max boost in the higher RPM where it was dropping off, and then increased the wastegate duty in that area as well. All in all, it appears to be functioning quite well now, but sort of sketchy in my mind.
NOW, does anyone know what a good replacement for the short bent arm actuator would be? I'm trying to figure out what turbos/cars came equipped with this actuator so I can track down a few.
#7
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,039
Total Cats: 6,607
No. I tried that first, and all it did was raise the baseline pressure. It still had the same dropoff. In my case, this was not caused by a weak wastegate can, but simply by taking the boost reference from a stupid place. (And by a cheap tube-n-fin IC that probably has a higher ΔP than most of y'alls.)
Thread
Thread Starter
Forum
Replies
Last Post
Frank_and_Beans
Supercharger Discussion
13
09-12-2016 08:17 PM