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I cannt get my boost any higher?
by
jpedro
on 03 Feb, 2010 00:23
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Hey, i have a 1990 jetta with a 1.6L TD i have straight pipe 2 3/4" pipe, cold air intake, fuel pump cranked up a considerable amount, blow off valve with a metal down inplace of spring, and the waste gate is disconnected. This car has a K turbo on not sure as to which one it is exactly, but i only hit a maxium boost of 15psi no matter how hard i try. is this right or is there something i have missed to do? or have done wrong? what do you figure. ive got a garret turbo id love to throw on here but not sure how well it would work its a AR 42 cold and exhaust is ar43 i bleive this is the right numbers, but i want to hear more turbo to and i know the garrets are really good for that, i belive is a T3 flange though and the jettas are a T2 are they not? let me know what yall figuree.
j ped
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#1
by
anto
on 03 Feb, 2010 05:22
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Boost leak?
Any splits in any of the boost pipes?
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#2
by
Rabbit on Roids
on 03 Feb, 2010 07:24
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also, if you have no boost leaks, take the cold side of hte turbo off and check that big o ring in there.
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#3
by
starrd
on 03 Feb, 2010 07:26
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I would suspect that either the wastegate is stuck slightly open, or it is not sealing correctly. One of the turbos I took apart the wastegate was open slightly and wouldn't move freely. Also the wastegate valve/seat get pretty ugly over time allowing leakage.
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#4
by
Smokey Eddy
on 03 Feb, 2010 10:55
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blow off valve
Why?
is this right or is there something i have missed to do? or have done wrong? what do you figure.
Pretty sure your BOV is designed to blow off pressure like a valve would.
i belive is a T3 flange though and the jettas are a T2 are they not? let me know what yall figuree.
I figure the exhaust manifold of any car from the factory depends entirely on which turbo was put on it at the factory...
meaning if your car came from VW with a Garrett T3 on it, it will likely have a matching manifold on it...
no, not all jetta's came with the same exhaust manifold.
If all you want is sound put a truck turbo on there. It will never make boost but it will constantly be spooling?
Also, my T3 was missing the o-ring around the compressor housing which made it bleed boost and the turbo was extremely loud due to over spooling. If your turbo it's self is leaking boost causing the turbine to just spin like crazy you wouldn't be complaining about not being able to hear it.
Mine sounded like a turbine off a commercial jet - and never saw over 15 psi either.
If you are driving normally and the boost needle uniformally climbs to 15 and then just stops i am definately pointing the finger at blow off valve. Speaking of which, why did you add one to a diesel engine? Diesel's dont have a throttle body.
Or are you talking about the stock BOV - which bleeds boost at i believe 8-10 psi (I may be wrong)
From my experience if your waste gate is stuck open you will have a very hard time making boost at all ever. Basically only at WOT will you see any numbers if your waste gate is stuck.
What is the history? did the car just suddenly stop making more than 15 pounds or what? did you buy the car like this?
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#5
by
Rabbit on Roids
on 03 Feb, 2010 11:13
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the blow off valve never lets there be more than 15 psi manifold pressure. bolt it closed...
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#6
by
Vincent Waldon
on 03 Feb, 2010 12:35
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He has:
blow off valve with a metal down inplace of spring
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#7
by
Smokey Eddy
on 03 Feb, 2010 13:23
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He has:
blow off valve with a metal down inplace of spring
meaning it doesn't function?
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#8
by
Rabbit on Roids
on 03 Feb, 2010 14:14
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yes. basically the next best thing to just taking it off. i just missed that part is all.
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#9
by
Kantdrivefast
on 03 Feb, 2010 16:35
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has the exhaust wastegate been plugged and not just the one on the manifold?
Ive got 20+psi on almost stock fueling with my K24 and both the blow off and wastegate gone.
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#10
by
Smokey Eddy
on 03 Feb, 2010 16:44
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Same, except i run a Garrett T3
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#11
by
jpedro
on 03 Feb, 2010 22:33
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so on the waste gate theres more then one spot to disconnect it? i just disconnected the metal line and thats where i put a fitting for my boost gauge. the stock bov is not functional and as far boosting to 15psi it goes up no problem and halts right at 15 im suspecting the wastegate is slightly stuck open a bit, so how would i go about checking this becuase when i got the car it was totally stock so im kinda stumped. is it easy to pull the turbo to inspect it all, or just pulling the waste gate to clean up to make a seal is that fiarly easy or a chore in itself? any thing else you need to know drop me aline here
thanks
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#12
by
RabbitJockey
on 04 Feb, 2010 04:36
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remove your down pipe u can see the valve on a k24. be careful those studs love to snap off.
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#13
by
sdwarf36
on 04 Feb, 2010 09:38
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Are there any pics somewheres of what to do to block everything off?
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#14
by
Rabbit on Roids
on 05 Feb, 2010 09:17
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you do not want to block your wastegate. you want a boost controller. if you block your wastegate, you will be replacing the turbo sooner rather than later. and you get FULL boost at like half pedal now, instead of full boost with full pedal.