Dyno day was fun. Saw some pretty cool cars (not just MINIs)... and some other cars that reinforced the addage "don't judge a book by it's cover". Specificlly a few ratty ricers putting up some scary figures (300hp out af a civic!?! A 450hp older rx7!?!).
Used a Dynojet and Winpep 7 program Other stuff (some I didn't understand): Gear - 3rd Run Type - RO (?) Temp - 53.45 degrees F Humidity - 61% humidity Uncorrected - 1.00 (?) CF - Uncorrected (?) Smoothing - 5 (?) Max power = 180.21(hp) between 5600-5700 rpm Max torque = 204.25(ft-lbs) @ 4400-4500 rpm Power and torque curves were nice and smooth, confirming my seat-of-the-pants opinion of the R56S JCW (or at least MY R56S JCW). Power was a little down from what I had hoped, as I've seen other R56s JCWs topping out between 187hp and 193hp at the wheels. The UK chart first posted was 206bhp!!! (I'm guessing that had to have been a corrected number estimating power "at the crank"... otherwise, we're really getting ripped in the US!!!). I have no idea what factors could have come into effect causing me to be 7-10 hp off from other US hp numbers out there. Then again, the Hawaii car shown earlier was putting out 170hp... so, I don't know. It's all new to me. Maybe someone else can give me a little education and provide some insight. https://www.northamericanmotoring.co...Chart12-15.jpg If this one is too hard to read... the GREAT BIG version is in my gallery. |
The UK figure of 206hp was corrected ( crank ) power. So 180whp is about right.
The power curve is so flat between 4-6k revs. That's the reason the R56 is so quick compared to R53JCW / GP in my opinion. |
I also thought power runs were supposed to be carried out in 4th gear as a near to 1:1 ratio ?. Isn't 3rd gear likely to give a slightly higher figure ?.
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it´s really interesting, another R56 jcw dyno results, thx so much :thumbsup:
Most of the dynos in spain, gear used is 5th (in 6speed cars), 4rd in cases 5speed cars, i´ve never seen 3rd gear used at dynos for a 6speed car :confused: curves and forms are right, more or less, really i was thinking peak power jcw r56 would be at 6k rpm, and the max power looks a bit low (so knowing is whp), sorry. In three weeks i´m going to install jcw kit and i will return my car at the dyno to compare with stock results past june, i´ll post the results, both. regards from spain |
Originally Posted by japper
(Post 1928075)
I also thought power runs were supposed to be carried out in 4th gear as a near to 1:1 ratio ?. Isn't 3rd gear likely to give a slightly higher figure ?.
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Originally Posted by japper
(Post 1928074)
The UK figure of 206hp was corrected ( crank ) power. So 180whp is about right.
180.21 x 1.12 = 201.83 180.21 x 1.13 = 203.63 180.21 x 1.14 = 205.43 OK. I can live with that. :thumbsup: |
So if the average driveline loss is 12-14%, then... 180.21 x 1.12 = 201.83 180.21 x 1.13 = 203.63 180.21 x 1.14 = 205.43 OK. I can live with that. :thumbsup: I have a question. Shouldn't the formula for calculating the crank hp rating be: 180.21 x (1.00 / .86) = 209.55 bhp for 14% drivetrain loss therefore a 12% loss would yield about 204.78 bhp (?) |
This really makes me wonder what kind of numbers the factory kit is going to put out if this is just a few hp down from the 210 or so that is currently being tossed around.
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Originally Posted by curtis0407
(Post 1930104)
I have a question. Shouldn't the formula for calculating the crank hp rating be:
180.21 x (1.00 / .86) = 209.55 bhp for 14% drivetrain loss therefore a 12% loss would yield about 204.78 bhp (?)
Originally Posted by Yucca Patrol
(Post 1930123)
This really makes me wonder what kind of numbers the factory kit is going to put out if this is just a few hp down from the 210 or so that is currently being tossed around.
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I think that it is pretty standard for auto manufacturers to provide the crank hp rating as their spec. Also, I know that BMW is notorious for under-rating their motors.
Soooooo - I think you should be very pleased. :thumbsup: |
Cost
What does the JCW mod cost if you didn't purchase initially?
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Originally Posted by Viper Freq
(Post 1932490)
What does the JCW mod cost if you didn't purchase initially?
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Originally Posted by msh441
(Post 1930585)
Just where, why and how is MINI getting their power figures?
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