Eric check this out

[roushraven]

What extrapolation are you doing to get to the 278rwhp figure? See below

If I remember correctly your original dyno woth LT's and U/D pullies relfected 258rwhp. Your most recent with the cat-back and tuning showed 264rwhp. How do you figure the misfire is causing a 14rwhp loss? I compared before and after dyno number and that was the difference.

Am I missing something? See below

How did Chris determine the car was misfiring, and what does he think is causing the misfire? He had a scan tool

I know you had a bad coil-pack before. Is this something different? My local service departmentment is checking it out even as I type

more info, more info...

Baseline
232.5rwhp 266.2tq (Stock)

253.9rwhp 287.9tq (Hdrs, off road, stock catback)

258.6rwhp 294.9tq (Same as above plus Steeda pulleys)

266.7rwhp 304.5tq (Same as above plus original MAF to fender
Densecharger and Paul's High Performance Chip)

Dyno last Saturday, misfire noted with the Star tool
245.4rwhp 274.3tq (Same as above no PHP chip plus full length system)

252.5rwhp 283.9tq (Same as above plus PHP chip)

264.6rwhp 303.2tq (Same as above minus PHP chip plus JMS chip)


The difference between the baseline figure without misfire and the same configuration with misfire 19.2rwhp 28.9tq
258.6rwhp 294.9tq
-245.4rwhp -274.3tq

19.2 + 264.6= 278.8rwhp
28.9 + 303.2= 323.5tq


So my assumption is that if I can restore my car's power to before the dreaded misfire level then I should be very close to the 278.8 323.5 level. I'm going back to the track and dyno later this month to test my theory and of course I'll post my results. Still clear as mud?

[BULLITT208]

Originally posted by roushraven

Baseline
232.5rwhp 266.2tq (Stock)

Almost identical to my stock baseline.

253.9rwhp 287.9tq (Hdrs, off road, stock catback)

I don't have a similar dyno.

258.6rwhp 294.9tq (Same as above plus Steeda pulleys)

My numbers were 255rwhp and 284rwtq. (I do have a catted H-pipe so that would account for the slight discrepancy)

266.7rwhp 304.5tq (Same as above plus original MAF to fender Densecharger and Paul's High Performance Chip)

Dyno last Saturday, misfire noted with the Star tool
245.4rwhp 274.3tq (Same as above no PHP chip plus full length system)

This is where you are getting your difference from. I get it.

252.5rwhp 283.9tq (Same as above plus PHP chip)
264.6rwhp 303.2tq (Same as above minus PHP chip plus JMS chip)

This is where you are getting the improvement from the jms chip and tuning. My question is, are you going to check A/F and timing after the misfire is corrected? I can imgaine it might have an affect on the A/F at a minimum.

The difference between the baseline figure without misfire and the same configuration with misfire 19.2rwhp 28.9tq
258.6rwhp 294.9tq
-245.4rwhp -274.3tq

19.2 + 264.6= 278.8rwhp
28.9 + 303.2= 323.5tq


So my assumption is that if I can restore my car's power to before the dreaded misfire level then I should be very close to the 278.8 323.5 level. I'm going back to the track and dyno later this month to test my theory and of course I'll post my results. Still clear as mud? [/B]

Thanks for spelling it for those of us who rode ths short, yellow, bus to school.


Eric

[roushraven]

My question is, are you going to check A/F and timing after the misfire is corrected?

A/F absolutely, timing however is controlled by the chip. To be safe I will do load testing just to make sure that I'm not experiencing any detonation. In fact that's what I Chris did and it's a highly recommended safeguard. After all of this is done I'm planning on installing Fox Lake P&P'd heads, Crane custom cam, Mod Max springs and an extrude honed intake. Stay tuned.

Arthur