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canty_rex

turbo stutter?????

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Hi all,

I have searched through and cannot seem to find an answer to my question so Ill ask it.

The other week doing some open road travel in my 1999 wrx I was passing starting at around 95km 2500rpm 5gear and speeding up and the turbo seemed to stutter I watched the boost gauge when I went to pass again same circumstances and it did it again and the boost drooped and rose again when it stuttered ( I dont know whether its the right word but it seems to fit). It did smooth out but it was weird. I had to for the drive back run 95 when I usually run98 dont know if that has anything to do with it. I cant remember if it did it on the way down tho I dont think it did. Havnt tested it recently to see if it does it again now im back on 98.

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Just sounds like a miss, the change of gas may have caused it. When was the last time you did plugs?

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I got the car 6 - 7 months ago the enginge has just ticked over 23 thou so never been done I gues since the engine replacement

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the thing is did the car jerk and loose power as it stuttered - or was the car going as normal and stuttered

diference is the 1st one would seem like spark blow out - second would seem like compressor surge

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more likely to be a failing coil/spark plug, although at kms that low you wouldnt expect that, check spark plugs are gapped, could also be a vacuum leak, unless youve got the boost wound right up but it doesnt sound like boost cut

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i asked if the car hesitated / jerked - that would indicate a missfire (spark blowout)

boost cut does exactly that - cuts the injectors off

if it is stuttering and the car is still pulling and not jerking / hesitating (just boost fluctuating) it seems more directed at compressor surge

its fairly easy to get compressor surge out of a VF with high load / low revs

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boost wont fluctuate with knock tho

he said his boost went up and down etc

best thing - take a video of it

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i would get compressor surge around a bar in higher gears with low revs on part throttle

take a video of it that will explain it surely

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nah compressor surge on throttle is nothing to do with bov

if it is surging on throttle- in laymans terms - the turbo is giving too much air - so much the engine cant use all of it so it comes back out the intake

bout as basic as i can put it

it might not be compressor surging - but normally if u stand on the gas in lower gears and its fine - and at low revs in higher gears u get it - it could well be compressor surge

bovs that are tightened will cause off throttle compressor surge - not on throttle

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2500rpm in 5th with a reasonably flowy turbo is bound to cause surge if you get your foot up it. I get surge in 3rd-6th if I just bury it at low rpm.

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If it is compressor surge - dont keep doing it - compressor wheels don't like it haha nore do the bearings

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