no boost

[dbow-4]

I have a 95 420a eclipse iam runing a t3\t4 turbo but 1st gear there is no boost. 2nd gear 2/3 psi the rest of the gears 5psi. If anyone knows whats wrong please help.

 

[RadDsm]

How large is the turbo? Have you checked for boost leaks?

 

[96TurboGS]

Cool....a 2gnter around my area. I agree with the above post, look for exhaust leaks (around all gaskets) along with boost leaks around the intercooler piping and vac lines. Try the leak down test. What's your wastegate spring set to? Where do you have your boost gauge teed into? Try rerouting it from the gauge to the TB and see if that makes a difference. Are you running nitrous with your turbo on a stock block??

 

[dbow-4]

The Wastegate Spring Is 7 Psi Iam Not Runing Nitrous No More How Do I Do A Leak Down Test

 

[dbow-4]

I Havnt Checked Yet

 

[96TurboGS]

Not a leak down test but a vac leak test there are many ways to do it. You're just checking to make sure you have a solid connection and no lose/torn vac hoses. If you smoke you can always blow smoke on the lines and watch it suck the smoke up (with car running). I usually disconnect a vac line and pressurize it with a hand pump and listen for hisses or look for bubbles when I put soap on it.(with car off) What's your vac reading at idle? Is it near (-15hg)-(-19hg)? If so then I would check the intercooler piping and tighten them up because you could have easily ran over something that could have knocked it lose. If not then your problem is your vac lines connection. As I said before check your exhaust gaskets on your manifold for damage.

 

[Locke]

We still need to know what kind of turbo it is.

 

[dbow-4]

garrett t3\t4 oil and water cool

 

[rstare]

I believe Locke was looking for more specific. There is a million different t3/t4 turbo's.

 

[dbow-4]

Not a leak down test but a vac leak test there are many ways to do it. You’re just checking to make sure you have a solid connection and no lose/torn vac hoses. If you smoke you can always blow smoke on the lines and watch it suck the smoke up (with car running). I usually disconnect a vac line and pressurize it with a hand pump and listen for hisses or look for bubbles when I put soap on it.(with car off) What’s your vac reading at idle? Is it near (-15hg)-(-19hg)? If so then I would check the intercooler piping and tighten them up because you could have easily ran over something that could have knocked it lose. If not then your problem is your vac lines connection. As I said before check your exhaust gaskets on your manifold for damage.

at idle the vac is reading negative 10

 

[dbow-4]

I believe Locke was looking for more specific. There is a million different t3/t4 turbo's.

it is a a/r 42 if that help

 

[bullettdsm]

at idle the vac is reading negative 10

Unless you got some radical azz cams, you have a vac leak (which becomes a boost leak)

MB

 

[DSMcrazy3]

Sounds similar to a problem I had way back when, I couldn't find any boost leaks though. My problem turned out to be the head/exhaust manifold gasket. The bottom of each cylinder ring had been burnt out so the exhaust gas was escaping before the turbo.

something to consider checking.

 

[bullettdsm]

Sounds similar to a problem I had way back when, I couldn't find any boost leaks though. My problem turned out to be the head/exhaust manifold gasket. The bottom of each cylinder ring had been burnt out so the exhaust gas was escaping before the turbo.

something to consider checking.

Good point but that wouldn't give -10 vac.

FWIW, in my definition, that's considered a boost leak.

MB

 

[DSMcrazy3]

I get what you're saying, but I checked pretty much everything twice when this happened to me, until I found out the problem. I don't want it to go unchecked, if a simple boost leak test doesn't reveal the problem.