barely building boost with ebay turbo
As the title says, i'm barely building any boost (no matter what i do with the MBC) with my 92 that has an ebay turbo with an internal wastegate. I've searched high and low for boost leaks and cant find any, although there is a slight hiss near the intake manifold. i can't remember if that hiss was always there or if it started around the same time as the boost drop. also it doesnt seem like a boost leak to me since it hits the same 18 in/hg of vacuum as before. i also haven't been able to spot any exhaust leaks before the turbo. i even changed the manifold to turbo gasket just to be safe, to no avail. there is no smoke from the tailpipe so i wonder... is my ebay turbo finally blown but the oil seals are ok? or is that not even possible?
EDIT: forgot to mention that the wastegate has two nipples on it. the upper one I can't blow into, the other blows right out by the rod with hardly any resistance. i can switch the vacuum line with my MBC on it from one to the other and it makes no difference whatsoever. |
what turbo is it?
for the wastegate, you use the top nipple, leave the bottom open. |
Do you have a leaking BOV or recirc valve?
Stationary checks wont work as you can not build boost without driving the car. (Or using anti-lag.) |
Originally Posted by Braineack
(Post 859496)
what turbo is it?
for the wastegate, you use the top nipple, leave the bottom open.
Originally Posted by sturovo
(Post 859500)
Do you have a leaking BOV or recirc valve?
Stationary checks wont work as you can not build boost without driving the car. (Or using anti-lag.) wouldnt vacuum reading be different though? i guess i'll have to build a boost leak tester... I was trying to avoid that. :vash: |
well it's not going to build boost on a 1.6L untill like 4.5K or above.
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Originally Posted by Braineack
(Post 859510)
well it's not going to build boost on a 1.6L untill like 4.5K or above.
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Originally Posted by f1luva92
(Post 859507)
its a t04e turbo. a/r 60
i've tried tightening the BOV already, no luck :( wouldnt vacuum reading be different though? i guess i'll have to build a boost leak tester... I was trying to avoid that. :vash: |
bad coupler? bad turbo gasket?
what's full boost? |
Originally Posted by sturovo
(Post 859514)
Is your vacuum measurement after the throttle? If yes, it will not be affected. MAF Idle would be affected though.
Originally Posted by Braineack
(Post 859515)
bad coupler? bad turbo gasket?
what's full boost? full boost is about 7 psi. |
Disconnect the MBC and run just WG.
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Originally Posted by miater
(Post 859526)
disconnect the mbc and run just wg.
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Originally Posted by Miater
(Post 859526)
Disconnect the MBC and run just WG.
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What is the waste gate set as? Why are you using a MBC?
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Originally Posted by triple88a
(Post 859531)
What is the waste gate set as? Why are you using a MBC?
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While you're still chasing ---- bypass it completely... Less parts, less stuff to narrow down.
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Originally Posted by triple88a
(Post 859536)
While you're still chasing ---- bypass it completely... Less parts, less stuff to narrow down.
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Are you sure that the waste gate is closed?
Did you have to clock the turbo to fit your car? Have you moved the wastegate actuator? |
So there are no unusual hissing noises when you try to build boost in higher gears? When my CHRA failed, there was no oil smoke, just a light metallic noise and no boost...but that's with a dual bb turbo, not a chinkacharger.
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Originally Posted by BogusSVO
(Post 859552)
Are you sure that the waste gate is closed?
Did you have to clock the turbo to fit your car? Have you moved the wastegate actuator? EDIT: now that i think about it, the rod was pulled out a little bit with the flapper as closed as it would go. i figured that was supposed to be like that for more tension on the flapper making sure it was closed. was i right with my assumption or is my wastegate most likely not closing all the way? |
Originally Posted by Doppelgänger
(Post 859554)
So there are no unusual hissing noises when you try to build boost in higher gears? When my CHRA failed, there was no oil smoke, just a light metallic noise and no boost...but that's with a dual bb turbo, not a chinkacharger.
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