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Car won't boost above 0.5

 
  #31  
Old 10-06-2010, 08:19 PM
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Originally Posted by ttboost View Post
Boost is actually a resistance. Are you going to take the hoses off the ouput of the compressor or the input? Either way is bad. Input will allow you to suck stuff in, and won't tell you much, with the output open, that will likely over spin the turbo to reach your target boost...which how are you going to measure if this is open?
We were going to to take off the input, after cleaning out the area around the dyno etc...

I made my mechanic talk to Markski, who told him how to check for boost pressure from the turbo itself (before they were checking for boost leaks starting from right after the turbo) and then also look over the check valves on the turbo.
 
  #32  
Old 10-06-2010, 08:41 PM
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Its the check valves on top of the motor... but leak to lines to the catch cans and other few things....
 
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2001 996TT 3.6L and stock ECU
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  #33  
Old 10-06-2010, 11:05 PM
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Originally Posted by bad107 View Post
Just had Alpha 28's, headers, injectors, rear intake piping, y-pipe, TB, and plenum on my 2001 996TT that already had 16G, exhaust, I/C and softronic tune.

Everything was initially pressure tested to 20 PSI.

When the EBC is turned off, the car will not boost above 0.6 and when it gets to 0.6 there is a loud whooooosh sound as you continue to accelerate. When the EBC is on, the car will boost up to 0.9 bar and then immediately drop to 0.6 and hold flat at 0.6 with the same whoooosh sound. The sound does not get louder the faster you go, its just a constant whooosh.

We thought the intake piping was collapsing in one area, so we had a custom hard piece made to go in that spot...nothing changes.

My mechanic that did all the install is unfortantely out of town for 2 weeks (), so the other guy is going to re-pressure test everything and check the diverter valves.

I really hope its not the intake piping in a different area that is not accessible without dropping the engine!

Anything else he can test?

Thanks in advance for any help/comments!
Does the car go rich when this happens? if so boost leak after turbos. If its lean and the ECU is limping then it is pre turbos. Smoke it. one of my intercoolers split and the smoke was coming out the inlet air duct not in the engine bay or under the motor.. Just out the duct. who looks there?

Good luck!
 
  #34  
Old 10-07-2010, 01:55 AM
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Could this be an issue with the wastegates?
 
  #35  
Old 10-08-2010, 09:41 AM
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just got off the phone with the mechanic...the 3 hoses going from the plenum to the head were loose. Also, one of the check valves above the engine was leaking.

He has tightened everything up and is putting the car back together

Will update....
 
  #36  
Old 10-08-2010, 10:13 AM
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Ahh so finally someone listened to me lol
 
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2001 996TT 3.6L and stock ECU
9.66
seconds @ 147.76 mph 1/4 mile
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160 mph @ 9.77 seconds in 1/4 mile click to view
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  #37  
Old 10-08-2010, 11:55 AM
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Originally Posted by bad107 View Post
just got off the phone with the mechanic...the 3 hoses going from the plenum to the head were loose. Also, one of the check valves above the engine was leaking.

He has tightened everything up and is putting the car back together

Will update....
Any leak after the TB will make the car idle high, Don't remember you stating that. Those three lines wont loose enough air to keep you at .5 bar unless you have stock turbos and that's a maybe, even the check valve is iffy. I was running 3076R's and a dv let loose I was still making .9 bar like that.
 
  #38  
Old 10-08-2010, 12:29 PM
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After they fixed those things the car is boosting properly!

Couple issues

1) small hissing noise from the passenger side as the car spools up...not sure if its a leak or its the new turbos...will check my EBC to make sure its holding 1.3 steady when I leave work

2) car is not any faster even though i added $10k of parts...injectors, intake system, headers and alpha 28s lol....when i floor it, my brockway is saying 10.7!! Retune is needed ASAP!!!! Going to durametric over the weekend and send me results to Dan/Scott ASAP!!!

Thanks Markski for all your help!!!!!
 
  #39  
Old 10-08-2010, 12:34 PM
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Timeout... before you do any datalogging... find out whats that hissing noise..
that may throw the afrs.... what are the afrs at idle?
 
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2001 996TT 3.6L and stock ECU
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  #40  
Old 10-08-2010, 01:01 PM
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Originally Posted by [email protected] View Post
Timeout... before you do any datalogging... find out whats that hissing noise..
that may throw the afrs.... what are the afrs at idle?
I will find out what it is. It might just be turbo noise...

I will check my EBC when i leave the office and see how steady its holding the 1.3 on pump.

I can't remember the AFRs...will find out as soon as i leave work.

Thanks again!
 
  #41  
Old 10-08-2010, 01:04 PM
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you should not run 1.3 bar on pump gas... is that what you were told?
that turbo is too big.... did yo install the second pump?
 
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2001 996TT 3.6L and stock ECU
9.66
seconds @ 147.76 mph 1/4 mile
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160 mph @ 9.77 seconds in 1/4 mile click to view
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  #42  
Old 10-08-2010, 01:08 PM
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Originally Posted by [email protected] View Post
you should not run 1.3 bar on pump gas... is that what you were told?
that turbo is too big.... did yo install the second pump?
i was told 1.3....i think softronic usually runs more boost rather than timing (although again, IDK)

no second fuel pump
stock fuel pump, stock FPR (3.8) and 60 injectors
 
  #43  
Old 10-08-2010, 01:13 PM
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I see... log the car at 1.1 bar.. then 1.2 and 1.3.. 3rd gear runs... that will give them more to go on...
 
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2001 996TT 3.6L and stock ECU
9.66
seconds @ 147.76 mph 1/4 mile
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160 mph @ 9.77 seconds in 1/4 mile click to view
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25% OFF on all 996-997-991 turbo tuning thru end of year- call now
  #44  
Old 10-08-2010, 01:18 PM
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Originally Posted by [email protected] View Post
I see... log the car at 1.1 bar.. then 1.2 and 1.3.. 3rd gear runs... that will give them more to go on...
Will do and thank you.

The mechanic told me the noise was likely turbo noise not a leak, but i will check my ebc and do the runs you wrote above to be sure.

I am also going to get bmoores to take it for a spin (if he can handle the tip).

I really think you need to start a technical support paypal fund!
 
  #45  
Old 10-08-2010, 01:24 PM
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Originally Posted by bad107 View Post
Will do and thank you.

The mechanic told me the noise was likely turbo noise not a leak, but i will check my ebc and do the runs you wrote above to be sure.

I am also going to get bmoores to take it for a spin (if he can handle the tip).

I really think you need to start a technical support paypal fund!
lol ironically i get the tech calls meanwhile others make sale lol things that make you go hhhmmmm lol jk its all good...
 
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2001 996TT 3.6L and stock ECU
9.66
seconds @ 147.76 mph 1/4 mile
click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
www.markskituning.com direct line - 773-980-6550 [email protected]
25% OFF on all 996-997-991 turbo tuning thru end of year- call now

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