car won't boost over 7 psi, bad turbo?
03-19-2007, 05:36 PM
#1
1.0 BAR
Thread Starter
Join Date: Jan 2006
Posts: 295
car won't boost over 7 psi, bad turbo?
my turbo don't boost over 7 psi.
im running a .60/.63 t3 from a nissan 300ZX,before i ran a .42/.48 t3 with no problems.
i did a boost leak test and found a leaking comp housing gasket, fixed that redid a boost leak test and it
does not leak now.
i
m running a voodoo MBC and it working correctly, with the test i did by pressurizing the system and watching
the wastgate open, then adjusting the mbc and the gate open at a diffrent psi, so the mbc is good.
the turbo has none to little, in and out play and a little more up and down play but minamal.
how can i check if a turbo is bad
also could i just keep the wastegate closed and go for a little run and see if it makes boost over 7psi,its not
really a good idea, but were should i go from here, any other ideas besides a bad turbo?
thanks
im running a .60/.63 t3 from a nissan 300ZX,before i ran a .42/.48 t3 with no problems.
i did a boost leak test and found a leaking comp housing gasket, fixed that redid a boost leak test and it
does not leak now.
i
m running a voodoo MBC and it working correctly, with the test i did by pressurizing the system and watching
the wastgate open, then adjusting the mbc and the gate open at a diffrent psi, so the mbc is good.
the turbo has none to little, in and out play and a little more up and down play but minamal.
how can i check if a turbo is bad
also could i just keep the wastegate closed and go for a little run and see if it makes boost over 7psi,its not
really a good idea, but were should i go from here, any other ideas besides a bad turbo?
thanks
03-19-2007, 06:26 PM
#2
Guest
Posts: n/a
Re: car won't boost over 7 psi, bad turbo?
Sounds like a wastegate or boost controller problem. if the turbo was that bad the fins would be hitting the housings.
Do you have an exhuast leak that would make it not boost so much the leak would be it's own sort of wastegate.
Do you have an exhuast leak that would make it not boost so much the leak would be it's own sort of wastegate.
03-19-2007, 10:28 PM
#5
1.0 BAR
Thread Starter
Join Date: Jan 2006
Posts: 295
Re: car won't boost over 7 psi, bad turbo?
Originally Posted by 95civicLX
i dont think the MBC is setup properly then. i know you said it was... but get some pics.
i was able to lower the boost when i would adjust it on my last drive in the car.
03-19-2007, 11:29 PM
#6
3.0 BAR
Join Date: May 2004
Posts: 5,042
Re: car won't boost over 7 psi, bad turbo?
Originally Posted by ryan1
i pretty sure the MBC is set up correctly, cause of my previous statemnts/testes, also
i was able to lower the boost when i would adjust it on my last drive in the car.
i was able to lower the boost when i would adjust it on my last drive in the car.
03-20-2007, 10:22 AM
#8
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Join Date: Mar 2004
Posts: 2,039
Re: car won't boost over 7 psi, bad turbo?
What size downpipe and exhaust are you running? With my first setup D16a6 w/ T3 .42/.48 I had a 2.5" DP to a stcok cat and exhaust it was to restrictive, as soon as i made it open DP it gained 2 psi :P
03-20-2007, 01:09 PM
#9
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Thread Starter
Join Date: Jan 2006
Posts: 295
Re: car won't boost over 7 psi, bad turbo?
Originally Posted by Loserkidwac
What size downpipe and exhaust are you running? With my first setup D16a6 w/ T3 .42/.48 I had a 2.5" DP to a stcok cat and exhaust it was to restrictive, as soon as i made it open DP it gained 2 psi :P
both set-up shared the same exhaust after the down pipe it's 2 1/2 all the way back
with a thrush 2 1/2 in and out glass pack and a dtm/ebay muffler i had laying around it's
2 1/2 in with twin oulets at 2 1/4
thanks
03-20-2007, 02:25 PM
#10
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Join Date: Apr 2005
Posts: 6,036
Re: car won't boost over 7 psi, bad turbo?
Originally Posted by Cray91
pull the vac line off your wastegate and see what happens.
p.s. a 48/49 off a sunbird will hit 16 psi on a mini me and still hold together hahaha
