Off to the dyno.

[happychap]

The car has been doing much better since the PC-Pro and spark plug install. I had a CEL after 400 miles and then nothing since for the past 300 miles.

Anyway I'm off to the Dyno on Thursday to see how much power I am making and if I am lean anywhere, what A/F should I beel looking for?

[FormerDatsun510Man]

A/F should be between 12-12.5:1, I tend to go closer to 12:1. Richer tends to be safer for extended boost, but also keep in mind it can become a problem if it is too rich also. Too rich is below around 11.5:1 on these setups from what I have seen. If you see it go above 13:1 that is too lean. Be especially careful with it being too lean at 6000+rpm. The high rpm is the part where having the steadiest a/f ratio is most important. On supercharged setups I have seen 12.5:1 as being optimum for max power up at high rpm. But I end up tuning to 12:1 up there also just to be on the safe side.

Bill

[happychap]

Back from the dyno and I'm really happy with the results. Stage One Tuning claimed 170 rwhp so I was expecting around 160, even the tech said he didn't think we would hit 170 at this altitude even corrected so we were both surprised when I hit 171 rwhp and 129 ft/lbs of torque. I'm sure the PC-Pro also had a lot to do with this.

The first 2 runs I came in a 155 rwhp and 153 rwhp because I was taking it too easy with the throttle but on the 3rd run on I floored it and got the 171 rwhp and then 169 rwhp on the fourth run.

The AFR shows lean but the Lambda Wideband was stuck in the tail pipe after the cat because I don't have a bung, because of this the tech said he normally has to drop the AFR one point when he does it that way so my AFR is really 12.21

The time and date on the dyno were wrong.

Here is the chart
http://www.teamzoom.net/gallery/d/2202-2/dyno.jpg

[Tom @ Fast Forward]

That's really neat but I have never seen a cat take 1 point off the AF. Maybe a 1/2 point, normally a little less. That AF looks lean. Your torque peak looks more like 138 or there about. I normally see torque at 80% of HP. 80% of 171 was 136 so torque look right on the money as well. I would add another 1/2 point of fuel if it was mine. None-the-less, it looks like a nice straight clean line.

[happychap]

Thanks for the advice Tom, are you suggesting increasing the whole fuel curve up one LED position?

You are right about the torque. I have another printout that shows hp, torque and a/f for every 100 rpms and at 5100 rpms I hit 137.7 ft/lbs

[Tom @ Fast Forward]

Thanks for the advice Tom, are you suggesting increasing the whole fuel curve up one LED position?

You are right about the torque. I have another printout that shows hp, torque and a/f for every 100 rpms and at 5100 rpms I hit 137.7 ft/lbs

See, I'm not just another pretty face. ;)

Yep, add a light to the yellow/blue and red/blue both. I'm just not real comfortable at 13.1.

[MiataMTF]

That's really neat but I have never seen a cat take 1 point off the AF. Maybe a 1/2 point, normally a little less. That AF looks lean. Your torque peak looks more like 138 or there about. I normally see torque at 80% of HP. 80% of 171 was 136 so torque look right on the money as well. I would add another 1/2 point of fuel if it was mine. None-the-less, it looks like a nice straight clean line.

I agree, the cat might take off 1/2-percentage point.

FYI - max power usually around AFR = 12.6. That'd be my goal.

Just curious, as the SOT SC a M45 or MP62?

[chuckerants]

I agree, the cat might take off 1/2-percentage point.

FYI - max power usually around AFR = 12.6. That'd be my goal.

Just curious, as the SOT SC a M45 or MP62?

It's a MP62