HI All
I'll try and keep it short.. but compleet.
Thursday I had my truck dyno tuned.. I thought the carb might be too lean.. They told me that the 750 Edel is a rich running carb..
First run on the dyno
258 Hp with about 320 TQ.
Timming total 36*
and show rich..

They leaned out the carb 1 jet on primarys and 2 jets/rods on the secondaires and turned the timming to 34* total.
264 hp with around 350 TQ.
and thats where they left me..
On the print out they gave me it didn't list the TQ numbers.. it listed something called Tractive effort lbs??? What ever that is.. it was around 1280.. Don't know how that goes to TQ numbers.. He said it close to some of the diesels they've run. and I should see it in my 60' times.

Any who I went racing Friday expecting to be faster and my times and speeds all went down.. (made me slower WTF??)
Here's my best Time for May's race and by best times for Firdays run's.

MAY
R/T -.013 (I know RED LIGHT)
60 2.170
330 6.136
1/8 9.390
MPH 75.63
1000 12.213
1/4 14.604
MPH 94.25

JUNE
R/T .071
60 2.199
330 6.257
1/8 9.580
Mph 74.14
1000 12.451
1/4 14.876
Mph 93.00

So was it me or should I go back to the dyno guys and see if something went wrong?? They also said I would do better with a 600 edel?? I have heard that big fords like it rich so is that true and maybe I should have them jet the secondaires back up??
Thanks
Tim

you cant total a race car
you just get tired of fixing it.

Density altitude was probably a LOT different between May & June, I wouldn't sweat it

--------------------------------------------

You can't condemn the bad if you don't commend the good

Yepper. Usually a TON of difference in ambient temp & humidity between May and June.

OK
it was quite rainy that week and early that day..
does any body know about that Tracitve Effort Lbs. deal for that dyno.. I'd never heard of that before..
Thanks Guys
Tim

you cant total a race car
you just get tired of fixing it.

I'm lost on that one. Last time I went to the dyno all we got was horsepower numbers

--------------------------------------------

You can't condemn the bad if you don't commend the good

I'm about .1 slower now than in early May and about 1.5 MPH off. DA has a lot to do with it.

You cannot get any real usable, comparable number off a chassis dyno IMHO - just numbers for that session that you can use for tuning - during that session. Come back in a month, no changes - you get different numbers. So I wouldn't worry too much about how to convert tractive effort to torque, even if you could.

Assuming 3500 lbs, your MPH figures in the 1/4 show a difference of about 9 HP - not much. Weather can do that easily. Your ET is off - driving technique, track prep, shift points, staging RPM, suspension reaction, wind, phase of moon, etc. ET is just ET, not really a tuning reference. 60' can be for suspension tuning.

If you had the weather conditions for the runs you posted, you could figure effective HP and then compare the time slips, somewhat. As a true test of the tune, you would need to go to the strip, take at least 2 passes as is ( preferably 3 ), then jet up and do again. All on the same day. Then you'd know if it wanted more fuel on the top end.

1967 Falcon 4 door 351C-4V
1970 Mustang 351C-2V
http://raceabilene.com/kelly/hotrod
Owner built, owner abused.