Dynos for Top Speed?
Thread Starter
Race Director
Joined: Jul 2007
Posts: 11,467
Likes: 8
From: 972 and 405
Dynos for Top Speed?
Hey I notice on some dyno charts they post the speed the vehicle is "traveling." Just curious for those who have done this on their own dyno runs, how accurate this is. This may be a good/legal way for me to do this. Normally on dyno pulls, do they just measure the horsepower in certain gears or do they run the car through all the gears to redline?
-Alex
-Alex
Burning Brakes
Joined: Feb 2007
Posts: 1,037
Likes: 0
From: Kansas City Missouri
St. Jude Donor '09
Normally you would put it in 4th for M6 or 3rd for Auto and start sampling between 2500 to 3000 rpm and run it to redline and then shut down. And if the dyno isn't loaded I don't think a top speed pull would even be accurate at all.
Burning Brakes
Joined: Feb 2007
Posts: 1,037
Likes: 0
From: Kansas City Missouri
St. Jude Donor '09
The mph on there is just a means of relation to horsepower. It can be switched from engine speed to wheel speed but its only there for tuning purposes (A/F ratio) and relation to torque and horsepower so you can see where it peaks and where it comes in at, etc. etc.
Tech Contributor
Joined: Oct 1999
Posts: 40,999
Likes: 9,764
From: Charlotte, NC (formerly Endicott, NY)
Not sure where they pick up the data for the speed but I can tell you it is pretty accurate for the rpm's of the engine. On most of the dyno runs I have seen where a manual transmission C5 is taken to the rev limiter in 4th gear the speed will read 137 on the dyno display. On the track my 97, although it was hard to interpret, the needle was just short of the 140 mark on the speedometer. That is less than 1% difference. Zs will read a little more as the 4th gear rev limiter speed on my 03Z reads 146 on the HUD.
Bill
Bill
Burning Brakes
Joined: Feb 2007
Posts: 1,037
Likes: 0
From: Kansas City Missouri
St. Jude Donor '09
A loaded dyno loads the suspension as it is on the street usually sacrficing horsepower in the form of numbers but gives a much better tune in my opinion. Another benefit is you don't have to tune driveability in the street with a loaded dyno. Unloaded is good for showing off numbers and getting a nice baseline.
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