821 lb/ft of Torque? Seems a bit... ridiculously inaccurate, considering that the Dodge Viper V10 produced from 490 to 560 lb/ft (depending on generation). Are you sure it's not supposed to be a different scale, like inch pounds? Unless of course we're supposed to view the 178 lb/ft number under "TorqFly", which makes more sense. Why wasn't that number graphed instead?

The HP numbers are awesome though - 223 - nice! Time to upgrade to wider tires.

 

It's time to find the way to put all the power to the ground.
Show us what "the Beast" is capable of.

 

The torque figure in the graph is the wheel torque. The torque spec from the factory is crank torque. So the number in the graph is crank @ gear ratio. In this case it was run in 4th gear so it had a gear ratio of 4.615.

 

That is the power on the ground...he needs to find where to unleash that power.

 

Ah OK, makes sense... then the 178 number is the appropriate one for general comparisons. It's the scale that most people are used to seeing and talking about, anyway. Very impressive though, I didn't mean to discredit your ride... but you must agree that 821 crank would be... just a little bit nuts.

 

Not if you burn tires all the way through the rpm band.
If you don't have traction, power is useless.

 

The initial response after Matts post about the Viper underscores why I wanted to have a Tech session to explain just what is being measured and how. The torque numbers that are usually posted are corrected numbers of flywheel torque. Chassis dynos do NOT measure flywheel anything but rather WHEEL(hub) numbers. For example, if you take a 3000lb Mini and try to accelerate it to 60 mph in 7 seconds do you think you could do that with 150lbft of torque at the wheel? Obviously not. These tests were run in 4th gear which has an overall ratio of 4.615 and produced roughly 830lbft measured at the wheel. If we divide 830 by the overall ratio of 4.615 we get roughly 180lbft at the flywheel. One of the reasons that we don't use lower gears like 2nd or 3rd is that with their overall ratios being so high at 7.793 and 5.651 would overload the torque capability of the dyno.
This Dynapack dyno produces extremely accurate and repeatable numbers. This is the reason that we chose it as this capability is a key factor in being able to measure and tune an operating system as complex as the Mini.
If you have any interest in this subject, please plan to attend our Tech day on March 17th.

 

Good job on plugging the dyno event JB

 

Matt,

How's your gas mileage looking these days? Also, is the ECU still being fine tuned or is the current config the final?

 

Hey Matt

Nice work on your car. Something I would have loved to do.

Very nice

 

If I drive normally my mileage is actually better by about 1-2 mpg.