NO BOOST!!!! Did I just N/A my Turbo? (Possibly solved)
After discussing with my wife about a certain 944 S2 on rennlist I guess old girl(951) is angry. The car ran great yesterday no issues. Full boost when appropriate, and overall ran fine. I did use the A/C yesterday, but that is the only difference in my routine.
This morning I start the car up and idle and vacuum both look fine. I drive a few miles before merging onto the highway, I go WOT nothing happens. The car just slowly creeps along. No boost what so ever. So I let out and just get it enough throttle to get up to speed. I tried to go WOT a few more times in 4th, 5th gear nothing. No boost at all. As I am getting off the highway I thought I would try a lower gear for boost. No boost in any of the gears. When I got to work I checked the vacuum lines that I can see(mind you my vacuum is around 17-18 on the boost gauge). Nothing appears to be unhooked or changed since yesterday. Car is stock minus a gutted cat and K&N cone filter. Turbo(K26/6) was rebuilt 3 years ago by Lindsey Racing. Could this be an AFM or wastegate issue? |
Id check the compressor wheel.
|
Originally Posted by Paulyy
(Post 10500799)
Id check the compressor wheel.
|
Did you check your TPS connector? I tried unplugging mine a while back to track down another problem, and it almost completely eliminated boost. In almost every other way the car was the same.
|
Originally Posted by divil
(Post 10501004)
Did you check your TPS connector? I tried unplugging mine a while back to track down another problem, and it almost completely eliminated boost. In almost every other way the car was the same.
|
0 on an aftermarket gauge?
|
Originally Posted by 86 951 Driver
(Post 10501030)
Would you get any boost at all? My car is making 0 boost. Should I try to hook up that test light to the test port?
|
A stock WG with no boost control will only run about 4psi, which will certainly FEEL like "0 boost" and I imagine 0psi will barely register on the dash gauge.
Kinda depends on if it really is making, truly, 0psi. An aftermarket gauge will tell that for sure. If it's truly making 0psi, then I'd pull the J-boot and have a look at the compressor wheel. Otherwise I'd have a look at your boost controller. |
Originally Posted by OmniGLH
(Post 10501087)
0 on an aftermarket gauge?
Originally Posted by OmniGLH
(Post 10501212)
A stock WG with no boost control will only run about 4psi, which will certainly FEEL like "0 boost" and I imagine 0psi will barely register on the dash gauge.
Kinda depends on if it really is making, truly, 0psi. An aftermarket gauge will tell that for sure. If it's truly making 0psi, then I'd pull the J-boot and have a look at the compressor wheel. Otherwise I'd have a look at your boost controller. |
How does the car behave on the way to 0 psi? Does it come out of the vacuum as it normally would, just not make any boost pressure? Or is it slower to approach 0 psi?
|
Originally Posted by odb812
(Post 10501324)
How does the car behave on the way to 0 psi? Does it come out of the vacuum as it normally would, just not make any boost pressure? Or is it slower to approach 0 psi?
|
Could be the wastegate too--stuck open, bad diaphragm, burnt out wg valve, etc. Or even a nasty exhaust leak...
|
Originally Posted by Tom M'Guinn
(Post 10501382)
Could be the wastegate too--stuck open, bad diaphragm, burnt out wg valve, etc. Or even a nasty exhaust leak...
|
I'd check the compressor wheel (easy enough, just pull the j-boot and have a look). If that's fine, then look at the WG. Could be stuck open. Easy way to tell... the short pipe that ties the WG into the exhaust will be hot as the car idles because the exhaust will be flowing through it. (Normally at idle the WG is closed...)
|
If it was fine yesterday and you have nothing today, I wouldn't immediately jump to the conclusion that its your turbo. You are still running the factory cycling valve, correct? I'd start there. After that, I'd clamp the wastegate line and see if you get boost. IF that doesn't do it, then you can start thinking about the turbo.
|
All times are GMT -3. The time now is 07:52 AM. |
© 2024 MH Sub I, LLC dba Internet Brands