|
|
Post by BikeTuna on Jul 19, 2018 9:42:30 GMT
On my turbo, on the pipe that goes from the snail to the intercooler there's a 3mm tee-off that goes to the wastegate. The other day I was poling about the engine bay and spotted that the 3mm pipe was split. I had enough room on the pipe so I cut out the split and connected it back up, all good.
Since then I've lost all the turbo noises. I don't get any wastegate chatter, I don't get the whistle on acceleration, and I'm sure it's down on power too.
I get the feeling that the wastegate actuator is either not working properly or is plumbed in wrong. The car doesn't have an electronic boost controller (it's on there but bypassed as its not mapped for it yet) so it's just the actuator getting a feed straight from the boost pipe form the turbo. Is this right? If I'm revving the engine would I expect to see the wastegate move when it's on boost or when the throttle closes? I don't see it moving at all. |
|
|
|
Post by schercheeroo on Jul 19, 2018 11:40:38 GMT
Sounds like you've accidently de-tuned your engine.
I suggest that the split pipe was acting as a boost bleed off, in the same style as a manual boost controller. If this is the case, the boost leak would cause the turbo to boost above the actuator pressure.
Do you run a boost gauge or have an ECU that can log the boost? Has the boost dropped?
To get the boost back you may need to install a boost controller.
|
|
|
|
Post by BikeTuna on Jul 20, 2018 8:39:49 GMT
The boost is definitely down, by how much I'm not sure but it's around 0.9bar now.
I have an electronic boost controller in the car and ready to go but I haven't the cash for the remap at the mo so its just on safe wastegate levels. I guess that the safest thing to do would be to leave as is with the pipe not leaking until I can get it mapped.
|
|
|
|
Post by randyturbo on Jul 20, 2018 10:05:36 GMT
sounds like your lucky to find that, the turbo would boost way more than actuator pressure with a split in the hose, if you haven't had any mapping yet i wouldn't risk even run at 0.9 bar, if the timings wrong would easily get knock and risk bending rods
also if it is stopping at 0.9 bar the actuator is working correctly as it would just boost until the turbo cant produce anymore boost.
|
|
|
|
Post by BikeTuna on Jul 20, 2018 10:21:43 GMT
Cool, all makes sense. I'll leave it as it is until I can get the mapping done.
Would this explain the loss of all the turbo noises? |
|
|
|
Post by randyturbo on Jul 20, 2018 13:04:34 GMT
no not really ! turbo should be spooling up if you see 0.9 bar and with no dumpvalve you should get lots of turbo flutter
|
|
|
|
Post by schercheeroo on Jul 20, 2018 19:07:10 GMT
At 0.75 bar mine choos it's Choo off. Big time.
If you don't have a dump valve I'd be looking for a boost leak.
|
|
|
|
Post by BikeTuna on Sept 9, 2018 20:37:09 GMT
To resurrect an old thread...
This is all still happening. I changed out my boost gauge to a psi one as I'm old skool and understand it better. While I was there I found a split in the feed pipe to it so that's been sorted.
So I'm getting -10psi at Idle, and on full out acceleration I don't get anything more than 1-2psi. I still get no turbo noise. Seems too low to me?
|
|
|
|
Post by atlex on Sept 9, 2018 21:04:44 GMT
1-2 psi sounds like a boost leak or wastegate is stuck open..is your wastegate actuator keeping your wastegate closed on spring pressure ? can you push the wastegate open easily ?
I'd also consider getting your intake pipework pressure tested.
|
|
|
|
Post by BikeTuna on Sept 9, 2018 21:27:13 GMT
I'm suspecting the wastegate is stuck, it's pretty stiff to operate by hand.
Ill stick another one in and see where it is.
|
|
|
|
Post by atlex on Sept 10, 2018 9:43:10 GMT
if the wastegate is stuck, it sounds like it is stuck open, causing very little boost to be created. ^^
|
|
|
|
Post by BikeTuna on Sept 17, 2018 8:04:31 GMT
Spent some more time on this at the weekend, and I think Ive found whats going on.
The wastegate actuator arm was set up so that the gate never closed. It was adjusted on the arm to hold the gate about 10mm open at all times. I have no idea why it produced boost pressure before I changed out the pipes.
So Ive adjusted it so the gate is closed as static and it'll hold a solid 4-5psi and all the noises are back (the most important thing). Ive found that the actuator bracket has a lot of flex and the pressure could easily pull the gate open under pressure so need to look at reinforcing it somehow, but it's definite progress.
|
|
le sigh