Well it's been evident for quite a while now but never really enough to get on my nerves.
BUT today on the cruise...i'm over it.

The issue:
Heavy throttle mid RPM 2500-4000 ballpark. The boost is obviously on at this point. Then the engine jerks around like it can't make up it's mind. Gets into 4500-5000 RPM and it's all fine.

Low throttle no issues.
Seems to be more of a promlem when the engine is hotter.
Noted a small amount of oil externally on the wastegate actuator tee? No idea if it has anything to do with it.

The car: MY00, stock motor, GD intercooler,stock BOV, stock TD04, 3" dak pipe, dry pod. New O2 sensor installed several months ago made life better at low throttle. (Full throttle is open loop anyway).

So what are the possible causes? Any hints or words of wisdom?

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MY00 WRX. 89 Prelude. 99 CRV

boost spiking due to 10 degree air & the intake & exhaust mods you have.

are you running a boost controller of any kind?

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

No boost controller and stock unmodified ECU.

Seems to do the same sort of thing on a hotter day (higher ambient temps)

Recommendations?

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MY00 WRX. 89 Prelude. 99 CRV

When were your spark plugs last changed? I had a similar issue with the car being fairly hesitant/spluttering on boost, turned out to be guff plugs

Good point. It's coming up to the 200,000 service soon. I have no record of what was done at services other than it was serviced.

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MY00 WRX. 89 Prelude. 99 CRV

air flow meter maybe. Very common problem.
edit:
Spark plugs are due at 200,000 so maybe get them done

I understand you need a fairly compact socket to get these plugs out. Any one care to link me to what they look like and the size. 5/8"?

Ignore my uselessness.
Plug NGK PFR6B, 16mm socket (or 5/8").

I'm sure I can figue out how to get them out. Have tools, must use them..

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MY00 WRX. 89 Prelude. 99 CRV

Would be good to see if you are overboosting causing boost cut. Wastegate line could have fallen off.

Otherwise, what kind of air filter do you have on it? Could be air flow meter.

If it starts backfiring like antilag, could be crank angle sensor.

Tbh, without seeing the fault, it could be 1001 things. Might be best to take it to someone to fix.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Booked it in with S-Technic. I'm sure it's in good hands.

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MY00 WRX. 89 Prelude. 99 CRV

Indeed it will be.

Hug Damien for discounts

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]