Losing boost with carb spring in 4th and 5th gear
 

well i boost around 10psi with a carb spring on the internal wastegate good 1st 2nd and 3rd but 4th and 5th i have boost till around 4k then it just drops, should i try using 2 springs?

Re: Losing boost with carb spring in 4th and 5th gear
 

you should try using this magical new device they call a wastegate.

Re: Losing boost with carb spring in 4th and 5th gear
 

what kind of turbo?

Re: Losing boost with carb spring in 4th and 5th gear
 

NO ---- REALLY?


sna: its a saab t25

Re: Losing boost with carb spring in 4th and 5th gear
 

Then why did you even make this post? Problem solved.

Re: Losing boost with carb spring in 4th and 5th gear
 

Replace the spring with a piece of coathanger.

Re: Losing boost with carb spring in 4th and 5th gear
 

he said he is using a wastegate, with a carb spring instead of an arm.

Have you tested it without the carb spring? I hate internal wastegates.

Re: Losing boost with carb spring in 4th and 5th gear
 

Could be wrong, but the way I read it he has a plain dumb throttle return spring connected to the flapper instead of a wastegate actuator.

Re: Losing boost with carb spring in 4th and 5th gear
 

thats exactly the way you read it, best advice is to get an actuator back on there.

Re: Losing boost with carb spring in 4th and 5th gear
 

ur looseing boost because of the extact same reasonthat MBC's will boost different psi in different gears. More load onthe engine, more exhaust gas pressure, even though same boost pressure.