Went a 136mph trap speed with my 3020 (weight on track) car.

I made 671hk on my dyno run, but changed fuel mapping since then and gained from 128-136mph

Is it possible to run these trapspeeds with a lower HP than 671 or should it be higher and my mods had gain power?

Using a 10" A1 converter with 3000 stall, 4,56 rear with 33"/17" slicks. The car is a 72 Lemans.

Best run this weekend was 9.96/136 with 1.45 60:ie N/A

Started @10.20 and then put more duration on my acc-pump to get better 60:ies. My A/F logs view a lean spot now, buts it less than before. Gained from 1.54-1.50-1.47-1.45.

Originally posted by godsend:
Went a 136mph trap speed with my 3020 (weight on track) car.

I made 671hk on my dyno run, but changed fuel mapping since then and gained from 128-136mph

Is it possible to run these trapspeeds with a lower HP than 671 or should it be higher and my mods had gain power?

Using a 10" A1 converter with 3000 stall, 4,56 rear with 33"/17" slicks. The car is a 72 Lemans.

Best run this weekend was 9.96/136 with 1.45 60:ie N/A

Started @10.20 and then put more duration on my acc-pump to get better 60:ies. My A/F logs view a lean spot now, buts it less than before. Gained from 1.54-1.50-1.47-1.45. I'd say your 136MPH is very close to 620 engine HP in the car under the conditions at the time with that speed.

Unless you ran your air system, exhaust system, same accessories on the dyno, & happen to be running in air that is 60 degrees & a barometer of 29.92 which is the correction factor used by most engine dyno facilities you will have less HP than the dyno shows.

The difference between 128 & 136 MPH is approximately 90 engine HP at your weight

This is why the dyno is a comparative tool & is excellent for evaluating changes but is not a great predictor of what you are going to run in MPH unless you are running on a 60 degree day & the actual barometer is about 29-30 hg
The MPH you run is a very good predictor of the HP you have under a given set of circumstances though ;)

I never use ET to base HP number on as the ET part is up to you :D
You can estimate what ET your are capable of given a certain speed but there are way too many variables to use ET as a predictor of speed or HP. ;)

That wasnt too much HP. But it was about 15 deg Celcius intake temp when i dynoed. Now i have 28 deg Celcius.

And i use a full Exhaust system now.

So i need to get a 145 trap speed to have a strong 468 bigblock. ,(

But what the heck. Ill fix that ;)

I'd say your 468 runs purdy darn good.
From Sweeden?
How cool.

Ron Selberg......there is Sweedish somewhere in my ancestry....