Hub dyno, anybody used one ?

There's one close to me. Hadn't talked to him yet, but thinking about trying it out if it's not crazy expensive. If so, what kind of data did you get ?

No but I use a chassis dyno almost every day.

Just make sure your driveshaft is up to task in terms of not exceeding critical speed.

I did use one on my old S/P car as a favor of the shop owner, it was a fairly new one (maybe less than one year old ) from Australia, we tried some timing changes and changed one cylinder spark plug heat range to show a friend and fellow drag racer how sensitive E85 pump fuel is too the spark plug heat range, I put in one new Autolite 3933 which is one heat range colder than the 3934 I ran in that motor and it losts100 peak HP It didn't miss or make any noticeable differences in how it acted on that dyno other than losing that power, we put the old plug back in and regain the 100 HP That changed surprised me but made since after seeing those results
I had really fought finding out what that motor needed on tuning and spark plugs to make it run good on E85, it was very challenging That motor was around 14.to 1 compression ratio, I started tuning it with a Autolite 3932 and ten went o a Autolite 3931, that really hurt the performance so I went the other way up to a 3933 which helped it and then 3934 which help more and then tried 3935 which didn't help it so I ended up going back to the 3934 in it The last motor I put in that car with E85 had right at 15.0 to 1 compression ratio and it liked the 3934 plugs also
I whup it and learned a lot about staying with it until you get it corrected

I have used one and it is one of the safest ways to dyno. There is no slippage to worry about and it does not back load your drivetrain on deceleration. If you are going to run it through the gears then ensure they have an anchor to hold the front end down I used it with my Stock Eliminator Max Wedge and the payoff was unbelievable.

Max Weg

I'd be interested to know what kind of data you're getting when going thru the gears. Obviously you are seeing shift points, but how do they come up with better performance ? This shop has a dynapack hub dyno. I'll ask about the strap Thanks

Cab, 100hp change due to a sparkplug is eye opening to say the least.

I run a Max Wedge so tuning is an issue and having time at a track is not an option. Running through the gears will show you everything you need to know to replicate a 1/4 mile pass.

Max Weg

I did a dynapack, but it was like 20 years ago.

Short video by Blusmbl!

https://www.youtube.com/watch?v=UH_qBofQYlA

I ran a carb spacer test and collected info on that.

It was a good tool, but when I tried to come back and use the same dyno later with more changes the dyno owner said
I was not welcome there with my stuff anymore, because he did not like the max torque number observed as it was higher than the manufacturer recommended.

His equipment, his choice....
He was used to boosted 4 cylinder manual trans stuff and I guess the torque multiplication of the automatic spooked him.

So I never went back, in fact I never spoke to Matt at all after that as I felt he overreacted a bit....and the next time I went to Jake's dynojet instead.

The place I'm considering focuses on imports as well, but his website does say domestic cars are welcome, and it's race cars only, which is a good thing. I'll post back if I go. thanks