rev210 FINALLY books a dyno session!

[GTS-t VSPEC]

Adam,

The AFR don't lie, but that doesn't mean something else ain't happening. Do you have a fuel pressure reg?

See'ya:burnout:

[adam 32]

just the std one

[GTS-t VSPEC]

Might have insufficient fuel pressure, causing it to lean out on high boost?

See'ya:burnout:

[adam 32]

but steve was taking fuel out in the top end indicating that on stock fuel map/pressure its overfuelling

[GTS-t VSPEC]

Yeah true, I don't know. Have you have the injectors checked? That seems to be the problems with rev210's.

See'ya:burnout:

[adam 32]

nah

its a fair bit of work tho to get the top of the plenum off

i want to know its the injector first before i start pulling things apart

[GTS-t VSPEC]

I'm surprised that all the spark-plugs are phucked, cause I though only one cylinder would be running lean.

See'ya:burnout:

[adam 32]

yeh exactly

which would point to an overall fuelling problem, not an individual injector. a problem which should come up on the AFRs. bcos if theres supposed to be heaps of fuel according to the o2 sensor where is it all coming from? its not goin through the combustion chamber...

is it possible that the dyno is faulty? (maybe a dumb question)

[GTS-t VSPEC]

Nah, cause otherwise all the cars on the dyno would ping and have faulty AFR's. Maybe the heat from the one cylinder causes overheating in the others?

See'ya:burnout:

[adam 32]

heat from where though?

all cylinders are isolated as well (ie are in bores) so that wouldnt work. all the plugs were burnt white

[GTS-t VSPEC]

I think if one cylinder runs lean then the heat generated quickly spreads to the others, but I'm not 100% sure.

See'ya:burnout:

[adam 32]

doesnt sound right to me...

if one cylinder were running lean then itd show on the plugs

they wouldnt all be white (ie running lean)

[GTS-t VSPEC]

Don't know mate, I'm out of ideas, apart from flwo benching the injectors.

See'ya:burnout:

[NismoR34]

Originally posted by rev210

I think I'll make a few hp, it needs a couple to push the whale over the 1/4 in 13.3seconds.  

I'd better clean my engine pipes out before I go. They have almost 100,000kms of engine blow by crap in them. even the bleeder valve has sludge coming out of it.

cbf sifting through 120 posts to check, but wouldnt it be fair to get a dyno figure of the "current" state of tune, after all this is the state of tune you recorded your times in.

No cheating!

[rev210]

Originally posted by nismoR34

cbf sifting through 120 posts to check, but wouldnt it be fair to get a dyno figure of the "current" state of tune, after all this is the state of tune you recorded your times in.

No cheating!

The dyno I had done 230rwhp @4700rpm with ping issue, IS the state of tune I ran the 13.3 with.

I cbf looking up the threads that contain the details of the night at the drags story, it contains the description of the symptoms I have still got today.

[N I B]

Plugs are white in modern engines unless very rich so be carefull

reading plugs if you don't know what to look for.

The sensors fine and changed often and this week we've had

heaps of race cars on the Dyno for the 2 day event and some

have made big HP and not broken so the sensors good but will

need to be replaced after the all Avgas.

[rev210]

my plugs showed no signs of leanout, so it makes the problem even more wierd. It's possible still that one piston is running out of injector flow at the ping rpm.

I've gapped the 7s down to 0.7mm now and will see if this helps any.

I cleaned the intercooler, it had a reasonable although thin coating of blow-by oil in it. So that should help a little.

When my back (now completely stuffed) has healed I will change the fuel filter and I'll think about the upper plenum removal so I can get at the injectors.

[NismoR34]

Originally posted by rev210

The dyno I had done 230rwhp @4700rpm with ping issue, IS the state of tune I ran the 13.3 with.

Good to hear - except for the pinging of course.

[rob77]

On the same dyno my car only has about 190hp at 4700rpm to make 245hp peak power by 6630rpm. I figure once sorted dave should be making around 280hp

[NismoR34]

Originally posted by rob77

On the same dyno my car only has about 190hp at 4700rpm to make 245hp peak power by 6630rpm. I figure once sorted dave should be making around 280hp

I know what you're saying Rob but I tend to disagree.

Rev210's car has a stock turbo, intercooler etc. With only boost and safc I doubt any r33 could record 208Kw at the tyres on a properly calibrated dyno...