Car won't boost above 0.5
#16
Have you serviced your DV's ? I recently took mine apart, cleaned and regreased (Mobil 1 red syn grease, or white lithium) . I've always tested mine by pushing in the diaphragm from the bottom while applying suction to the nipple. The diaphragm should stay in the upright position without any assistance until the suction is released, when the suction is released it should release all the way back down without sticking. Repeat a few times.
I would assume you would see about .8 all the way to redline if you were running off the wastegate spring (assumming 1 bar actuators), and no leaks.
Wish I could offer more, I went through this with Todd @ Protomotive recently. I also ran a pressure test at about 20 psi, and checked for leaks.
Good luck.
I would assume you would see about .8 all the way to redline if you were running off the wastegate spring (assumming 1 bar actuators), and no leaks.
Wish I could offer more, I went through this with Todd @ Protomotive recently. I also ran a pressure test at about 20 psi, and checked for leaks.
Good luck.
Last edited by JSBear; 10-05-2010 at 05:25 PM.
#17
Do a pressure test from the turbos like I suggested via email... all your problems will show up.... forget doing the dvs test this and that.. the leak test as I suggested does all of that and much more.... trust me...
also, inspect the turbos... the compressor.. make sure they are not hitting the housing as they spin...
also, inspect the turbos... the compressor.. make sure they are not hitting the housing as they spin...
__________________
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#18
Do a pressure test from the turbos like I suggested via email... all your problems will show up.... forget doing the dvs test this and that.. the leak test as I suggested does all of that and much more.... trust me...
also, inspect the turbos... the compressor.. make sure they are not hitting the housing as they spin...
also, inspect the turbos... the compressor.. make sure they are not hitting the housing as they spin...
Give me a call tomorrow and I will let my desk know.
Best Regards,
Scott
#19
thanks
mark
__________________
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#20
I agree. Check you hose connections carefully. I bet one is not securely fastened, especially since you are hearing a loud whoosh at higher boost.
#21
Thanks everyone for your inputs! Inspector, MBailey, Earl, Markski (as always), Scott, TTDude, Neil @ Switzer, Jake @ Tial, and Mark @ Agency Power
MY mechanics will hopefully have this solved tomorrow.
MY mechanics will hopefully have this solved tomorrow.
Last edited by bad107; 10-05-2010 at 10:37 PM.
#24
Why are you asking this?
#25
if you have a leak before the turbo that would not cause your problem.. that is the non pressure side...
__________________
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#26
shouldn't, but what intake piping do you have!? If you're at 0.6bar with the throttle open, the DVs should be shut.
#27
The guys pressure tested everything..found a few small leaks and tightened everything up. Nothing changed.
The car is boosting up to .8 or .9 then immediately drops to 0.53 bar stable.
Mechanics think it is the intake piping above the engine.
Next step is to dyno the car with the turbos open to the air (i will make sure they brush and blow any crap out of the dyno way). If the car makes 1 bar of boost and holds it there we know the intake is in fact the problem.
Sound right?
The car is boosting up to .8 or .9 then immediately drops to 0.53 bar stable.
Mechanics think it is the intake piping above the engine.
Next step is to dyno the car with the turbos open to the air (i will make sure they brush and blow any crap out of the dyno way). If the car makes 1 bar of boost and holds it there we know the intake is in fact the problem.
Sound right?
#28
The guys pressure tested everything..found a few small leaks and tightened everything up. Nothing changed.
The car is boosting up to .8 or .9 then immediately drops to 0.53 bar stable.
Mechanics think it is the intake piping above the engine.
Next step is to dyno the car with the turbos open to the air (i will make sure they brush and blow any crap out of the dyno way). If the car makes 1 bar of boost and holds it there we know the intake is in fact the problem.
Sound right?
The car is boosting up to .8 or .9 then immediately drops to 0.53 bar stable.
Mechanics think it is the intake piping above the engine.
Next step is to dyno the car with the turbos open to the air (i will make sure they brush and blow any crap out of the dyno way). If the car makes 1 bar of boost and holds it there we know the intake is in fact the problem.
Sound right?
what is the greddy reading when car is at idle...
dyno will not solve or find the issue
__________________
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
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
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#29
The guys pressure tested everything..found a few small leaks and tightened everything up. Nothing changed.
The car is boosting up to .8 or .9 then immediately drops to 0.53 bar stable.
Mechanics think it is the intake piping above the engine.
Next step is to dyno the car with the turbos open to the air (i will make sure they brush and blow any crap out of the dyno way). If the car makes 1 bar of boost and holds it there we know the intake is in fact the problem.
Sound right?
The car is boosting up to .8 or .9 then immediately drops to 0.53 bar stable.
Mechanics think it is the intake piping above the engine.
Next step is to dyno the car with the turbos open to the air (i will make sure they brush and blow any crap out of the dyno way). If the car makes 1 bar of boost and holds it there we know the intake is in fact the problem.
Sound right?