Thanks 4naving just checked on the Torque app and it is reading 0.0-0.1psi boost when at idle. I guess that means no need to correct the psi at max boost then?
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Loss of Revs and Power on Acceleration...
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Thanks 4naving just checked on the Torque app and it is reading 0.0-0.1psi boost when at idle. I guess that means no need to correct the psi at max boost then?
I found a difference in readings with the torque app and boost gauge running side by side
the boost gauge would read 17psi and the torque app would read 26psi
if it is over boosting I would be looking at waste gate actuator
the boost gauge would read 17psi and the torque app would read 26psi
if it is over boosting I would be looking at waste gate actuator
yeah 26psi does seem high for the stock d22 turbs, i thought they were lucky to hit 16?
Oh I missed that one, good catch - yep, boost pressure at idle with throttle off is reporting as 14.79psi, so turbo output IS normal.
That means that nothing stands out in the data, because everything went up and down as it should, the only thing that stood out was the amount of boost and 4 naving figured that one out for us!
The actuator sits on top of the turbocharger and pushes down into it to adjust the vanes, so the motion you're seeing is absolutely correct.
You do realise that it means we're no closer to an answer, of course!
I've had another close look at the data. It's not the fuel. As your throttle increases, so does the fuel rail pressure - and it's fairly precise, the two values follow each other just as you'd expect. RPM follows both as you'd expect (it doesn't rise instantly but seems to always follow closely behind). On even closer inspection, it appears that there may have been a slight hill or something involved at around 16:38:33 when the throttle was applied lightly, the fuel rail pressure rose a small amount but the engine RPM remained fairly steady.
The question then is this: during the data gathering, did you experience the problem at any point? The data doesn't seem to show anything unexpected (and next time I'll watch the boost pressure!).
Tip: in Torque, you can configure (in Vehicle Profile) to remove 14.7psi from the manifold pressure. It should then show you more accurate boost readings.
That means that nothing stands out in the data, because everything went up and down as it should, the only thing that stood out was the amount of boost and 4 naving figured that one out for us!
The actuator sits on top of the turbocharger and pushes down into it to adjust the vanes, so the motion you're seeing is absolutely correct.
You do realise that it means we're no closer to an answer, of course!
I've had another close look at the data. It's not the fuel. As your throttle increases, so does the fuel rail pressure - and it's fairly precise, the two values follow each other just as you'd expect. RPM follows both as you'd expect (it doesn't rise instantly but seems to always follow closely behind). On even closer inspection, it appears that there may have been a slight hill or something involved at around 16:38:33 when the throttle was applied lightly, the fuel rail pressure rose a small amount but the engine RPM remained fairly steady.
The question then is this: during the data gathering, did you experience the problem at any point? The data doesn't seem to show anything unexpected (and next time I'll watch the boost pressure!).
Tip: in Torque, you can configure (in Vehicle Profile) to remove 14.7psi from the manifold pressure. It should then show you more accurate boost readings.
camo.b
Member
Strange one...
Ok well it is good news that things are operating as per normal and that the turbo is operating within its normal parameters.
There would have been one slight hill in the 2nd data set on the 2nd CSV. The 2nd data set on the 1st CSV had a more significant hill but the all the throttle data was missing on that one.
I did experience the surge in revs throughout the data in every gear with 3rd, 4th, 5th and 6th as the most noticeable. When I am seeing the surge in revs it isn't accompanied with the same increase in acceleration.
From what you're describing, it sounds like your clutch is slipping. If your clutch is fully engaged then any change in RPM absolutely must be equal to a change in vehicle speed.
Old.Tony I had a suspicion about the clutch slipping when I finally a realised that the increase in revs didn't seem to translate into increase in speeds. You could put a month old fish under my nose and if I was blindfolded I probably couldn't tell you it was there and maybe why I can't smell the clutch.
Perhaps my adjectives for what was happening in the title and initially were misleading. The good news is the turbo and engine fuel flow appear fine. Although you did say there was an issue with the sound of an issue.
I will go the mechanic with the view that it is time to replace the clutch I am planning to go HD SMF but any suggestions for brands or even places worth contacting between Brisbane and the Gold Coast?
Lots of guys use Exedy. SMF will last the distance - the DMF friction plate is too thin to handle much slippage, that's what kills them. Unfortunately you are going to notice extra vibration with the SMF - the whole reason for the DMF is to remove the slight variations in rotation speed (due to compression, then ignition, repeat). You're about to get the real feel of your engine - so don't panic when it comes back and you feel this new buzzing!
