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XR6 turbo shuddering under load with t/c off


03Xr6T- AK

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  • Member For: 3y 11m 28d

My Xr6 wont fully boost, has had new spark plugs, coils, fuel pump, fuel filter, new pod filter. Rpms get to around 3500 and starts shuddering, then comes normal. Sort of like a over boost cut. Read it could be the turbo being stuffed but otherwise any suggestions

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  • Member For: 15y 11m 19d
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  • Location: Melbourne

put a boost gauge on it to see what sort of boost it's getting to, so you can at least rule out whether it's over-boosting initially... but it seems unlikely to overboost and then the boost fall back down to an acceptable level in the higher rev ranges.

 

pull the intake off the front of the turbo and put light pressure on the shaft of the turbo and see if the blades touch the sides or move more than a mm or so backwards/forwards. If it does, the turbo might be stuffed... otherwise you'd be looking for damaged blades for a stuffed turbo at this point.

 

:Welcome2FordXR6t:

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7psi is about right for a stock 03 turbo... 12-13 would indicate it's overboosting or it has been tuned/modified in the past.

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no, it wouldn't cause boost issues by itself... but you wouldn't install one unless you'd modified the car for more boost via other means.

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BOV & front-mount don't significantly change airflow so it'd be fine to run stock boost through both.

 

what changed, if anything, between when it was running OK and when it started shuddering?

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Before all these were done to the car other than the blow off valve. The blow off valve was the first thing and car was working fine. Then suddenly started shuddering under load. Iv done all that to the car since to try figure it out. It's still not running as good as it use too especially with the shuddering

 

 

Let me fix that, I mean the shuddering has stopped a little but still not reaching full capacity 

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