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post #1 of 26 Old 06-23-2012, 01:30 PM Thread Starter
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turbo not boosting

well i traded my supercharger for a turbo kit and bolted everything on and the turbo was not boosting checked the wastegate and bov looks good checked cold side piping no leaks can hear the turbo spooling but no boost and car runs really rough so i bought a brand new turbo from turbonetics the gtk-850 and still no boost i know i got a leak on my cross pipe but will that not let it boost sorry new to turbo or wat else will not let it boost


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post #2 of 26 Old 06-23-2012, 02:12 PM
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Sounds like a coldside leak somewhere between the turbo and manifold, they can be tricky. I had a leak one time, made zero boost, could hear th turbo spool and no exhaust leaks. I checked all clamps and couplers and everything looked good and was tight. I was loosing my mind trying to find it lol. Eventually I just took all the piping off and reinstalled and clamped everything, and bam, Full boost again and never had an issue after.


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post #3 of 26 Old 06-23-2012, 02:30 PM Thread Starter
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i did that twice u think my exuast leak from my cross tube would not let it boost plus i replace my wastegate yeah its a cheap one but it should still make boost the only other thing i can think of is that is in the wrong place cuase most kits have it on the cross pipe and mine is on the passenger header right were the turbo bolts on

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post #4 of 26 Old 06-23-2012, 03:23 PM
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Originally Posted by 89 lx 347 View Post
i did that twice u think my exuast leak from my cross tube would not let it boost plus i replace my wastegate yeah its a cheap one but it should still make boost the only other thing i can think of is that is in the wrong place cuase most kits have it on the cross pipe and mine is on the passenger header right were the turbo bolts on
What size spring in your wastegate are you running? I have a 7pound spring in mine and when I drove it around it barley made any boost had to put a manual controller. Also is the bov setup right it? Could be opening and letting pressure out

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post #5 of 26 Old 06-23-2012, 04:55 PM Thread Starter
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i have a 14 psi 1 bar springs and not sure both the wastegate and bov is a ebay cheap #### yeah i know i went the cheap route and now paying for it its a emusia wastegate and a wanna be tial knock off bov

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post #6 of 26 Old 06-23-2012, 08:17 PM
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Might be a dumb question but are driving it and getting no boost or just reving the motor in park?

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post #7 of 26 Old 06-24-2012, 09:37 AM
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If a wategate wasn't working properly, it would stay shut, which means lots of boost. Form my experience even a larger exhuast leak which will be very noticebale ie loud and show black soot coming out from the leak area would not cause a no boost scenario, just lower the peak boost some and prolong spool.

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post #8 of 26 Old 06-24-2012, 12:05 PM Thread Starter
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Yes was driving around town and no boost in any gear and car feels like its hesitating when I put a load on it funny thing is that it ran great when I was supercharged and all I did was swap to a turbo and switched to a blow thru maf from pro m and now car r
uns like ####

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post #9 of 26 Old 06-24-2012, 12:12 PM Thread Starter
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And yeah exuast leak is very loud and annoying and leaks on both v band clampps on the cross pipe tried everything and it still leaks bad you think that could be the problem

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post #10 of 26 Old 06-24-2012, 01:27 PM
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And yeah exuast leak is very loud and annoying and leaks on both v band clampps on the cross pipe tried everything and it still leaks bad you think that could be the problem
A big exhaust leak is basically the same thing as a wastegate staying open, so yeah a big exhaust leak will cause no boost. You need ZERO exhaust leaks between the motor and turbo.


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post #11 of 26 Old 06-24-2012, 02:48 PM Thread Starter
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Aight thanks will take it to the exuast shop should I stay with v band or cut and put a 3bolt flange

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post #12 of 26 Old 06-27-2012, 10:52 AM Thread Starter
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Well picked it from the exuast shop and nowi got about 5 _7 pounds but only boost in 3rd gear and upp its suppouse to be at 14 psi checked all cold side piping and doesnt look like its leaking wat else would cause it to sputter and not boost all the way

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post #13 of 26 Old 06-27-2012, 11:06 AM
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What are your plugs gapped at, and did you retune it after you swapped mass air meters? If you didn't, you've found your problem.

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post #14 of 26 Old 06-27-2012, 12:55 PM Thread Starter
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Plugs [email protected] also no tune and no msd box yet

1992 chp 408w/Dart Iron /custom solid roller cam/1;72rr/quick fuel 950 cfm E-85 carb/super victor intake ported/pa performance super comp c-4/tci4500 stall

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post #15 of 26 Old 06-27-2012, 04:49 PM Thread Starter
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Thumbs down

Its got the same tune wen I was supercharged

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post #16 of 26 Old 06-27-2012, 05:50 PM
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Tune could possibly be the culprit... Me being an idiot when I installed my kit the first time forgot to put the fire ring into the wastegate causing it to be wide open. Lol easy fix though.

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post #17 of 26 Old 06-27-2012, 06:34 PM Thread Starter
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Yeah checked that and it has the fire ring

1992 chp 408w/Dart Iron /custom solid roller cam/1;72rr/quick fuel 950 cfm E-85 carb/super victor intake ported/pa performance super comp c-4/tci4500 stall

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post #18 of 26 Old 06-28-2012, 12:23 PM
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Its got the same tune wen I was supercharged
Pull the chip, set base timing to 4 degrees, and take it around the block, watch your a/f meter. If the maf was changed, tune is not anywhere close, guaranteed.

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post #19 of 26 Old 06-28-2012, 04:22 PM Thread Starter
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Aite will tr that today after work

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post #20 of 26 Old 06-29-2012, 10:06 AM Thread Starter
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I put base timing to 4 and ran even worse so put it back to10 and went back on the freeway did about 3 or 4 3rd gear pulls and woth my pms got a/f to 11.4_11.8 but still lags and only boost In 3 rd gear or higher and hesitates still wot timing is between 16 and20 degrees dont know wats going on

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post #21 of 26 Old 06-29-2012, 10:28 AM
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Tune could possibly be the culprit... Me being an idiot when I installed my kit the first time forgot to put the fire ring into the wastegate causing it to be wide open. Lol easy fix though.
Are you referring to the valve seat? I have a buddy that had a turbo silverado doing this exact same thing, and we ended up finding the valve seat was missing out of his wastegate.(thats what you get buying used stuff)
You could see all the way around the valve when it was supposed to be closed, so it was letting all the exhaust pressure out and wouldnt spool untill high gear.

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post #22 of 26 Old 06-29-2012, 01:31 PM Thread Starter
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Yes its got the vale seat / fire ring I just dont get why its sputtering and only get boost in 3rd or higher

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post #23 of 26 Old 06-29-2012, 02:00 PM
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Sounds like you need to go back and start over. Pull the plugs, do a compression test, check your timing to make sure it's reading at TDC on the balancer, etc. Make sure your fuel pressure is doing what it's supposed to, check TPS, check your grounds, scan for codes, etc.

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post #24 of 26 Old 06-29-2012, 04:45 PM Thread Starter
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Compressio is good fuel perssuee at40 with no vacum base timing at 10 only thing I think it could be is I need a msd box

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post #25 of 26 Old 06-29-2012, 05:06 PM
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Compressio is good fuel perssuee at40 with no vacum base timing at 10 only thing I think it could be is I need a msd box
How do you have your wastegate routed? I would remove the wastegate check the diaphragm. Do you have your vaccum routed to your intake or compressor wheel? Also that vacuum line goes to the bottom nipple if you have two on the w/g. Worth a shot man. Did you clock the Turbo while installing it?

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post #26 of 26 Old 06-29-2012, 05:53 PM Thread Starter
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I got a vacumm line from my intake to the lower port on the wastegate nothing else and yeah clocked the turbo about 45 degrees and tighten all bolts upp

1992 chp 408w/Dart Iron /custom solid roller cam/1;72rr/quick fuel 950 cfm E-85 carb/super victor intake ported/pa performance super comp c-4/tci4500 stall

2004 Mach1 stock long block/cai/off road x pipe/4:56 gears spooled/mach1 nx plate with nx safe system

Last edited by 89 lx 347; 06-29-2012 at 06:05 PM.
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