pull the line from the actuator, give it a stab.

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Long live the WRC

Miss adjusted wastegate arm???

What AFR's are you trying to run at / over 15psi?

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19psi


Between 13.5 and 10 depending on the RPM. How do you check for the wastegate arm?

Spare motecs, spare vf34's. Stuff!

How are you checking AFR's? Not with the standard o2 sensor surely? Do you have a wideband sensor up the butt of the exhaust?

I have a dual channel wideband O2 sensor kit installed in place of the factory O2 sensors which connect into the ECU so it can do it's own O2 correction in order to meet AFR's on the target AFR map, and I also have an Innovate LM-2 standalone wideband O2 sensor which I mainly use to check the other sensors are working and calibrated correctly (well in all honesty the LM-2 I didn't end up needing so I try and make it useful in some capacity by putting it up the butt of the exhaust as you say lol)

O.k well.... 10.0:1 is MEGA rich for 19psi.

I'd ignore the wastegate for now and get some fuel out of it.

I'm running 11.6:1 AFR WOT @ 25 psi in my 00 STI with zero knock (can go as lean as 12.0:1 for max power but I play safe)

When was the last time the plugs were done & what plugs did you go for Pfr6 or 7?

Do a free air calibration on your wideband & recheck your AFR's. Wideband may be out, thus running way richer than you think.

I know mine misses bad at anything under an AFR of 9.5 at 15 psi.


EDIT: This is worth a read Engine Misfire with PS2000 at 6,000 RPM

Same issue as you. Are you sure your issue isn't rpm based?

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All very good suggestions, thanks heaps.

Plugs were done around 3000 - 4000kms ago and they are 2 heat ranges colder than standard.

I usually try and do free air calibrations on at least the rear O2 sensor every couple of weeks but come to think about it I haven't done one for quite a while now so I'll definitely go and try that for sure.

I realise that an AFR of 10 is very rich, I guess I was erring on the side of caution especially given the NOS factor as well. It doesn't seem like the type of misfire commonly experienced with a too rich setup but I guess it sure wouldn't hurt to lean it out a bit and see how it affects things. I'm not too stressed about pinging/det as I always run octane booster to bring it another 7 points above the standard pump 98 and when tuning I always use a knock-box type setup with headphones just to be safe.

I'll let you know how I go shortly....

Are the plugs PFR8b's or something else (part number) ?

From what I know / have seen, Pfr7b is as cold as you need....even upto 300+ Kw.

If they're iridium anything throw them away!

What has this been Dyno'd at power-wise?

LOL at 7 RON points with octane booster..... It's probably lowering the RON of 98.

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