Miss Fire Testing - Eastern Creek

Went to eastern creek on friday having taken the day off work to try and solve the alisusive miss fire issue.
The hopes were high that we have fixed it with Unigroup having checked over the car and tweaked the tune and it not miss firing on the dyno.

I have left late from home and dropped michele off to work but mid way to the track i get a call from James saying it was packed.
Said i needed to get here ASAP or fear missing a spot, luckly that was not the case and james picked up the last two garages so we were set.
Unpacking i had already set my tyres pressures the night before and all i needed to do was tweak the dampner settings and drive.

Unigroup was coming out to work on another customers car and we had organised to book two garages together, he was running late so was not able to hook up the gear before the first session.

We were first up and i was last out in the pack, feeling pretty good i took it easy the first lap then started to get stuck into it on the second.
Coming round onto the straight on the end of the second lap reving up to 6000rpm it started, same miss fire problem, same spot, same deflated feeling.

Keep going and then someone dropped oil down on the track so we all came in and it was hard to stay positive, after about 30min i decided to try and get some more fuel before my next session started.

Headed off and by the time i was back Unigroup had got there and the second session was about to start. Didn't have time to hook up the AFM meter but they wanted to try and few things and see if it was fuel related.
We had looked at the logs from the first session and fuel temp and pressure were fine.
Suggestion was to take it easy coming on the front straight and then floor it going throught the gears. I went out and did this and it still miss fired although not as bad as before.

We hooked up after some stuffing around the AFR meter and ready for the 3rd session went out along with the video to see what the AFR's were. It was important to look at them before it miss fired as well as when it did.
Coming onto the straight the AFR's were fine and it was good to rule this out.

Forth and final session we turned the boost right down to wastegate pressure (60 on the Blitz) and went out, the miss fire had sort of gone but it was still there just not as bad.

This was the end of the day and discussion is now related to the valve train and in particular the harmonics of the valve springs, thoughts are that the valve springs and possiably the hydralic lifters.