do tires make a diffrence on the dyno
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Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Burning Brakes
Joined: Apr 2007
Posts: 972
Likes: 11
From: Dawsonville, GA
If they spin on the rollers they won't do you much good.
I only have Hankooks... so when RPM dyno'd mine, they put VHT on the rollers because the tires 'kept spinning.
I only have Hankooks... so when RPM dyno'd mine, they put VHT on the rollers because the tires 'kept spinning.
Last edited by Dragracer_Art; Sep 13, 2013 at 06:46 AM.
Le Mans Master
Joined: Oct 2012
Posts: 9,366
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From: Out back
In my experiences on the dyno...softer sidewall tires such as D/R's and slicks result in less power. This is not true in EVERY case however. The most extreme I've seen was a blown Cobra with 325/50/15 ET D/R's. No mods or tuning done, just brought it back a week later with his "street wheels" on and picked up 46 rwhp. Factoring in weather variations and dyno error...I'd say a safe bet was at least 90% of that gain was tire related.
A general statement I'll make is that usually...softer sidewalls result in less transfer of energy into the rollers...thus a lower output.
A general statement I'll make is that usually...softer sidewalls result in less transfer of energy into the rollers...thus a lower output.
Last edited by Pb82 Ronin; Sep 13, 2013 at 12:30 PM.
Burning Brakes
Joined: Nov 2012
Posts: 968
Likes: 8
He did the dyno drag, using my bike and his 11 year old son. He let a lot of air out of the rear tire, set the roller so the tic mark would trip right after the throttle was hit, and the bike got the best 1/4 dyno drag for Daytona that year.
Near the end of the bike week a new Hayabusa wanted to go up against my bike. My friend used his son again and the same
tricks'. My bike got an 8.6, 8.5 and 8.5 quarter mile. The Hayabusa a 10+, and two in the mid 9's.
I told the girlfriend of the Hayabusa owner her sweetie had been setup.
Last edited by J Christensen; Sep 14, 2013 at 01:16 AM.
