[L8APEKS]

I've read through some of the threads about dyno days but haven't noticed much in the way of posted results. I'm particularly interested in SAE corrected, stock MCS numbers at the front wheels and not just peak numbers. I'd really love to see someone's posted dyno graph to see what the TQ curve looks like.

Have enough MCS' on this message board been to the dyno to establish whether the published numbers (163 crank HP @ 6000 RPM & 155 crank TQ @ 4000 RPM) are close to reality. I read something in one of the threads which suggested that perhaps the published numbers were a bit conservative but I wasn't sure if that was an isolated dyno run or the general, dyno proven feeling.

As an aside, what is the commonly accepted % of HP/TQ loss for a FW drivetrain vehicle? My background is RWD where we'd estimate 15% driveline loss of HP & TQ.

Lots of questions from a newbie, but thanks for any answers!

[Gisby]

From an italian magazine:

crank 163.7 hp at 6730
drivetrain loss 18.5%(IV gear at max hp rpm)
wheels 133.4 hp at 6730

Torque 21.1 kgm at 3850 (declared 21.4 Kgm) I don't know the exact conversion

Ciao

[L8APEKS]

Quote:

Originally posted by obehave

General agreement seems to be 150 -155 ft/lbs at the wheels. These are corrected numbers.

There's a couple of torque/HP graphs here, too lazy to search (Performance and Tuning hint hint)

Am I missing something here? Are MINI's advertised numbers measured at the wheels and not the crank/flywheel? I wonder what kind of dyno was used if that's the case (just for apples to apples comparisons sake).

I did take your advice (thanks) and searched P&T and found the 2 dyno runs. Interesting. Unfortunately they're on 2 different types of dyno so not much in the way of comparison or consistent results. I was hoping to see a few more graphs.

The one done on the dynojet was especially useful as I'm familiar with that dyno. The numbers were SAE corrected and looked pretty promising. If I saw a 1/2 dozen or more similar results I'd be feeling better about the HP/TQ numbers.

The torque curve is very encouraging looking though.

Quote:

Loss % seems to hover between 15 -20%

Edit: Before you ask, here's a good one on shift points
http://www.mini2.com/forum/showthrea...ighlight=graph

Ah, you read my mind. Thank you, "obehave".

[L8APEKS]

I've been through the mod fests with previous cars. This one is built strictly for racing in a spec series:

http://www.mini2.com/forum/showthrea...threadid=20571

As someone stated in a thread somewhere else on this message board, "If the car isn't 90% what you want from the factory, then its probably not the right car for you".

The love of tinkering aside, these days I find much greater satisfaction (& far less headaches WRT reliability issues) from learning to drive the car I have well, rather than compensating with mods.

Don't get me wrong, I'm most definetly NOT trying to convince folks from tinkering with their car. The above is strictly my personal opinion. To each his own .

The main thing I was after in this thread was a look at some real life dyno graphs and, naturally, to gauge some shift point data. As a suggestion, you might want to check out this method of shift point calculation:

http://www.bgsoflex.com/auto.html

Click on optimum shift points. The results may surprise you.

[minimini36]

L8APEKS

Try these links to a German article on the MCS powertrain. The first one is the English version and the second one is the German version with all the graphs and figures. There is a horsepower and torque graph (fig 9) for the MC and MCS. There is also a graph (fig 2) showing the boost pressure (in Bars) into and out of the intercooler as a function of rpm. The input pressure is red, the output is black and the rpm lines are yellow. Accross the bottom is cubic meters per hour of airflow.

http://www.apqv05.dsl.pipex.com/m07-02-11.pdf English
http://www.apqv05.dsl.pipex.com/m07-02-08.pdf German with figures

[L8APEKS]

Quote:

Originally posted by minimini36

http://www.apqv05.dsl.pipex.com/m07-02-11.pdf English
http://www.apqv05.dsl.pipex.com/m07-02-08.pdf German with figures

Fantastic reference! Thanks minimini36. The oil cooled pistons are pretty trick!

[retroom]

Finding the optimum shift points may be nice to know but are you going to drive the car that way all the time?

Make sure you shift a few MPH before optimum shift point because by the time you release the clutch to the next gear the car would have increased those extra few MPH.

retroom

[L8APEKS]

Quote:

Originally posted by retroom
Finding the optimum shift points may be nice to know but are you going to drive the car that way all the time?

Um, why yes, indeed I am . I bought the car for the Belgian MINI Challenge race series. I posted some of the details in the Racing MINIs & Cooper S forums. I just placed my order yesterday and should take delivery in mid-February.

[retroom]

You are one one of the luck ones who get to thrash the car on a regular basis. I'm a little jealous...

retroom

[Andy@Ross-Tech.com]

I dyno'ed a little over 140 whp yesterday at www.helix13.com . That works out to:

160 crank hp (12.5% loss)
165 crank hp (15% loss)

Sounds just about right for a stock vehicle rated at 163 hp at the crank. BTW, to go from wheel hp or tq to crank, use the following formula:

wheel / (100% - loss%) = crank
140 / (1 - 0.15) = 165
140 / 0.85 = 165

The torque curve is extremely flat and looks similar to the curve for the Cooper, except the curve is of course shifted upwards.