kleach18

I just got a boost guage. I installed it and ran it from a vacuum sorce that was just caped off. I used the crapy plastic hose they supplied. Now the question is what exactly is the boost guage supposed to read at idle and rpm and how much boost would it be running with a streetported turbo II motor? The only thing done to the turbo was I removed the aux thing that was opened up via vacuum source(I got rid of the source). And matched the size of the two holes going to the turbo(stock s4 turbo and manifold) Any info would help thanks...

Scott 89t2

with a street port probably around 15" of vacum.

where did you tap in? it's need a be a vac / boost source after the TB. some are not.

kleach18

It is on the back side of the upper intake manifold..... Liek right below the bac valve. I have block off plates for all the emmisions stuff(everything is blocked off except the bac valve.) but a nipple for the pressure sensor and one left over that I blocked off until I installed the boost gauge.

kleach18

At idle it reads like 10(below the 0 PSI) then when I let off driving I get like 20. It says when I'm accelerating that I am running like 13 PSI at 4k RPM.

kleach18

Anybody????

kleach18

Anybody????

garlandrx7

go to bed and ill tell you how to fix it tomorrow! sleep is good!

kleach18

And my exhaust is straight through 3in all the way to straight through 3 in mufflers....

Scott 89t2

10 is a little low. might have a vac leak.

how many miles on the engine? if it's brand new then it'll get better.

kleach18

Its brand new with less then 3000 miles on it, it just needs to be tuned so it idles really low like 300 to 400 rpms

kleach18

Also when I hold the pedal so it idles where its supposed to be it reads like 15InHg(or whatever is is called)

garlandrx7

my bad, i thought it had more than that

TheBigOne

when im at idle i get about 10 below. when i gas it goes down a bit to like -20 then at about 4k i get about +10 lbs boost. i tapped in to a vac line from the manifold.

ilike2eatricers

just curious but why would you want it to idle so low?

garlandrx7

he doesnt want it to idle so low... "it just needs to be tuned so it idles really low like 300 to 400 rpms" and "when I hold the pedal so it idles where its supposed to be......"

RylAssassin

Umm did you guys miss this? Hes running 13 psi at 4k? This is a little high dont you think?. Yes Kleach now you have entered into the realm of boost creep with that open exuast... Not good needs to be fixed. IF your hitting 13psi at 4k then what are you hitting at 6k? Its prob gonna be like 15psi and you dont want that on a stock turbo. Id say max is 12psi and thats still a little high. Just keep in mind this **** can make your engine go pop, did you upgrade you seals at all? Im just lookin out for ya thats all. Make sure the wastegate is operational and that youve ported them well enough.

Rob500

"The only thing done to the turbo was I removed the aux thing that was opened up via vacuum source(I got rid of the source). "

Did you remove the wastegate actuator?

Rob

sectachrome

whats boost . yes, i am an idiot.

Jaared

I hope he is talking about the twin scroll and not the wastegate.

dr0x

I would explain 13psi at 4000rpm

Scott 89t2

15" at correct idle is fine... that is what I said in the first post. so it's fine.

ignor the vac at 400 RPM is means nothing...

you should have given more info in the first post. it would have made things so much easier.

but yes the 14psi is too high. don't floor it untill you get some more fuel.

kleach18

just removed the twin scroll not the wastegate. I don't think its actually runnning at 13 PSI, I think that something is hooked up wrong. i havent taken it above 5k yet.

dr0x

What type of boost gauge is it?

kleach18

Some cheap Type X racing gauge i bought off of ebay, maybe thats the problem??

marcus219

Speaking of boost guages..how come I hear people ******* on Auto Meter boost guages? Auto Meter makes good quality stuff as far as I know...is it b/c its not made my blitz or hks or.....?