Mark Anderson

I've got 125 pulls with this car on that dyno so I feel pretty good on how we had it. I'm looking at my KN filter at the moment and thinking it may be sucking in and restricting air flow.

Bill Ball

We don't allow K&N filters on our cars.

So, if you are using Hall and knock sensors with an EZK, do you have the diagnostic port that you can use to check their function? Spanner, Sharktuner or Theo's 928 diagnostic could be used to check them.

The passenger versus driver side plug versus idle observation doesn't make a lot of sense to me. You are firing on all cylinder as you have the same or better power below 5000 RPM.

Normally the injectors switch to every other rev at about 5000 RPM. I don't know what could be wrong, but it is coincident with that. Could be fuel, but you said the AFR is OK. So, I would look at airflow or timing (either cam or ignition advance) and the things that affect those.

Better check to make sure Greg didn't leave a rag in the intake.

Mark Anderson

I do have a spanner and thest test were all good including WOT.

atb

More torque and less HP? It almost looks like your running a stock intake again. With the loss at the top, it would seem to be an airflow issue if the A/R is good.

BC

eloquently saying what I said does not count.

atb

It counts, it's just hard to understand.
I guess it would help if I read all the posts leading up to my own, and not just assume that I'm going to come up with some novel yet cogent idea that no one else has thought to consider.

Mark Anderson

I agree and I am hoping it is the air cleaner but I need to exhaust some more ideas before I go back to the dyno.

Darien

Mark, keep us posted...good luck

PorKen

The torque peaks are almost 700 rpm lower, higher in number, and the hp is also ~700 rpm lower.

I found there's roughly 100 rpm movement per degree, so I'd guess the belt is a tooth off (7.5°) on one or both cams.

mark kibort

not that easy at all. mine with stock 85 cams was timed perfectly, yet the porken tool showed 6 degrees advance on the driver cam and 2 degrees advance on the passenger side cam. I think the tool has limited applications. However, i now know where my baseline is

mk

mark kibort

It would be interesting to see where greg timed the engine's cams. I know that they are higher lift and a little more duration than GT cams, but how does he set the timing?

good point though!

mk

mark kibort

you work fast, you killed Bill and me with the race to the dyno. we could have had it running today, but we were really tired last night after those darn headers. who did you have helping you ? Kilber elves??

mk

PorKen

The tool is always correct with stock cams. It references a fixed point on the heads, versus the angle of each exhaust cam. Just like the water pump pointer and balancer marks.

It is not affected by block/head/gasket height, timing belt age, or cam chain stretch, like a dial indicator is.

Your dial indicator readings are incorrect.

mark kibort

its much better than your first dyno runs with the new intake. If you remember, the peak spike at the end was 485 rwhp, while the meat of the HP peak was only 475. I dont know what has happened between then , this 500+ dyno and now, but something has changed.

Mark Anderson

I think if one cam was off I would see that in different compression numbers from one side to the other.