new boost gauge, only 9inhg at idle

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new boost gauge, only 9inhg at idle

Postby montj » Tue Feb 28, 2006 8:23 am

got a new twosrus boost gauge hooked up the back of the intake manifold.
at idle after warmed up it doesnt get any higher then 9inhg and when maintaing a speed with 10% or so throttle it reads 0 vac/pres. i hit about 5.5-6psi on first and second and 6-6.5 in 3/4/5.

after searching the forum, i read alot people get around 20ingh mostly.
does it sound like a vacuum leak? im not very good at diagnosing car problems.

thanks
-james
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Postby d1alltrac » Tue Feb 28, 2006 9:14 am

i would say either a vacuum leak or a faulty gauge, how does the car run?
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Postby RIalltrac » Tue Feb 28, 2006 11:23 am

is that 6 psi at WOT? if so then I would definately say something is wrong.
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Postby montj » Tue Feb 28, 2006 10:19 pm

yeah 6psi WOT on 3rd,
the stock boost gauge sits at the - line and doesnt hit 0 until im accelerating with at least 25% throttle.
WOT on 3rd it boosts all the way to the last line on the gauge.
i know the stock boost gauge is know for being inaccurate, but it sounds more like my aftermarket gauge is off.

also the previous owner had the turbo rebuilt with a 60 trim, i havnt even heard of someone with that big of trim on stock ct26. maybe thats the problem.

and as far as i can tell the car runs fine, passed smog recently and doesnt bog down or do anything weird.

thanks alot for the help,
-james
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Postby db » Wed Mar 01, 2006 12:02 am

I get between 18-20 inches of mercury at idle. Everything else you mention is hard to compare to because of the different possible situations, but you are definitely low on vacuum. Definitely sounds like the boost gauge isn't reading correctly. Is it a mechanical or electric gauge?
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Postby montj » Wed Mar 01, 2006 10:49 am

i fixed it, i reconnected everything and i guess some of the fittings were too tight and now it reads 18-20inhg and i hit 6.5psi, almost 7, steping on it in 3rd. sound safe to install a mbc and try some higher psi?
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Postby RIalltrac » Wed Mar 01, 2006 11:29 am

montj wrote:i fixed it, i reconnected everything and i guess some of the fittings were too tight and now it reads 18-20inhg and i hit 6.5psi, almost 7, steping on it in 3rd. sound safe to install a mbc and try some higher psi?


sure, you wont be able to go past like 10 without disabling or limiting the fuel cut.
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Postby 20incher » Sun Mar 12, 2006 3:02 pm

A wee bit off topic but i had a stock ct26 with a 60 trim and a friend in austin has a ct26 with 60 trim with a 10 degree clip...so they are around. However it is a big turbo and if your running on stock internals as well as IC and Fuel...i would not suggest going above 12-13 psi. my 2 pennies
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Postby MetalliKAT97 » Sun Mar 12, 2006 4:28 pm

RIalltrac wrote:
montj wrote:i fixed it, i reconnected everything and i guess some of the fittings were too tight and now it reads 18-20inhg and i hit 6.5psi, almost 7, steping on it in 3rd. sound safe to install a mbc and try some higher psi?


sure, you wont be able to go past like 10 without disabling or limiting the fuel cut.


Depends on how lucky you are....some of us hit higher PSI without the FCD....had 2 cars like that already
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Postby TomsGT4 » Sun Apr 09, 2006 6:33 pm

Common, just get an 3" dp & mp :D
I hit 10 sometime 11psi WOT without my boost controller, and no fuel cut.

If I remember correctly stock fuel cut is set around 12psi.
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Postby theUNYTEDone » Sun Apr 09, 2006 8:42 pm

i would just be safe and get an FCD...there were a few threads saying how to make them for less than ten bucks...but congrats on fixing the problem.
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