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

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Jul 31, 2005 | 10:58 PM

chr1z

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Posts: 29

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?

Aug 1, 2005 | 12:48 AM

FooK

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Posts: 9,790

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

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

Aug 1, 2005 | 12:10 PM

USS

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Joined: Oct 2004

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

what kind of turbo?

Aug 1, 2005 | 03:32 PM

chr1z

Thread Starter

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Joined: May 2005

Posts: 29

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

Quote:

Originally Posted by ****

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

NO ---- REALLY?

sna: its a saab t25

Aug 1, 2005 | 06:03 PM

HMTguy

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Posts: n/a

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

Quote:

Originally Posted by chr1z

Quote:

Originally Posted by ****

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

NO ---- REALLY?

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

Aug 1, 2005 | 08:48 PM

Fang

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Joined: Mar 2005

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

Replace the spring with a piece of coathanger.

Aug 1, 2005 | 08:56 PM

USS

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Joined: Oct 2004

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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.

Aug 1, 2005 | 10:37 PM

Fang

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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.

Aug 1, 2005 | 10:39 PM

FooK

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Joined: Apr 2004

Posts: 9,790

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

Quote:

Originally Posted by Fang

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.

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

Aug 1, 2005 | 10:59 PM

#10

Weq

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Joined: Apr 2005

Posts: 54

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.

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