6 members from our club, MetroplexMINIs, got their cars dyno'ed yesterday morning... Dynojet 248c @ ATS Racing in Denton, TX. It was 68 degrees during testing and about 90-95% humidity...

There's a LOT of consistency among the results of the MC's, while the results from the MCS' are different depending on mods.

All Coopers has BMP/Promini intakes and MTH software... two had cat-back exhausts and one had stock...

Cooper results:

http://engr.smu.edu/rcam/cpm3v/minidyno1/dynoday019.htm (my car, BMP intake, Borla cat-back and MTH software)
http://engr.smu.edu/rcam/cpm3v/minidyno1/dynoday015.htm (BMP intake, MTH software, catback)
http://engr.smu.edu/rcam/cpm3v/minidyno1/dynoday018.htm (BMP intake, MTH software, stock exhaust)

MCS results:

http://engr.smu.edu/rcam/cpm3v/minidyno1/dynoday020.htm (stock, JCW and MValant's modded car compared on one graph)

The JCW car made slightly less power than the one modded by Mvalant (pulley, Quicksilver, intake, etc.) but made slightly more torque...

Anyway, just wanted to share these with everyone...

 

Wow! This is a good showing for the regular Coopers. Looks like the MTH s/w makes good hp and torque! :smile:

 

I remember a dyno run that Dandp did on his cooper a while back. Numbers were similar 109 and 103 if I remember right. He had an intake and cat-back with no chip.

 

Its odd that the one with the stock exhaust has the highest HP...do you think that is due to the exhaust? Or do you just think he started out with more HP from the factory...?

I have a Piper-X intake and Borla catback...how much of a difference did you notice on your cooper with the MTH...i was looking at getting the MTH and since we have the same mods, i was interested in knowing how that went

 

I have no idea about the exhaust, really - either my car just made slightly less power from the factory, or we're all in about the same ballpark and some just had slightly better pulls... the more important thing to note is that all 3 cars made more power than stock. We're all really close together, so it could have been all sorts of things that caused the difference...

The MTH software really, really rocks - especially for the price. As a competitive autocrosser, I LOVE the extra mid-range torque and extra few RPM's provided by bumping up the rev limiter. I can now leave my car in 2nd longer before some turns and in slaloms, whereas before I was having to bump the stock rev limiter or shift into 3rd and lose a bit of power... Also, since the car has more grunt down low (look at that NICE torque curve on the dyno chart!), I can avoid downshifting into first gear on really tight corner exits...

Besides on the autocross course, the car is just plain more fun to drive on the street, too... It was well worth the price of admission - more so than the Borla for sure, but not more than the BMP intake (which just sounds wicked at WOT from 5-7K RPM's).

I may move to an RSpeed exhaust in the near future, since I think I may have a buyer for my Borla... if so, I'll go get the car dyno'ed again and see if it makes any difference. My guess is that it really won't! Since hearing one in person, I've decided I kinda like the sound of the RSpeed better than my Borla... shrug...

 

Wow, thanks for all this info...I commend you for getting all this info out to the public.

What is the accepted stock number for coopers? I know its advertised at 115

 

I remember the Grassroots Motorsports project car Dyno'd at 109 and 103lb Ft of tq when they intially dynoed it in stock trim. They were pretty suprised to see their numbers so high. That's close to 140HP at the crank!

Did anyone Dyno their cars before the mods?? Either way, great information. Thanks for sharing.

Stuart

 

Wow that's really great guys! I think it's time I send back the PocketDyno that Asodestrom loaned me. Heh heh, those numbers pretty much confirm my own tests. Wooohooo. Franz and MTH CarTune rocks!!!

 

Is the drivetrain loss for a CVT higher than for a manual tranny?

Alex

 

scobib,

Thank you for dyno MTH Coopers :smile:
I am too wondering how much HP I gain after MTH.
Yep, MTH rocks, but 140 at crank That's more than what I expected

 

I'm not sure what most people are using, but I'd expect the drivetrain loss to be about 14-15% on these cars... Most stock numbers I have seen on the dyno are about 101-102 hp at the wheels, which is about the same as the quoted 116 hp at the crank from the factory...

Our results are about 126-130 at the crank, multiplying our results by 1.15 (15%) for the drivetrain loss... I don't think 140 at the crank is a very realistic number, but that's JMHO...

 

P.S. I forgot to mention one thing...

The wideband O2 results for the Coopers with the MTH software showed that everything's groovy throughout the entire RPM range...

Not sure about the results from the MCS' that were running the MTH software because I didn't see those...

 

Those result do look good, but I'm still waiting to see the MTH isolated from stock, or other mods. I would like to see some before and after runs

 

There was a good article in one of German Car magazines. They test different catback exhaust systems on MCS and then dyno tested them.

All showed like none or extremely small gains and others actually reduced the hp.
I still would like to know if the drivetrain loss of the CVT is the same than for a manual gearbox. That might also have a roll in the outcome.

Alex

 

Why would your car have less low end torque than the JCW? That doesnt make any sense. The 15% pulley gives you more torque than their 13.8%. I don't get it.

I have the Borla Sport Exhaust and it created more HP trust me. I dont care what anyone says. Helix tells me it makes power, I can feel it and that's it.

 

The stock 05 MCS made some huge torque compared to the other two modded cars. They should be really strong after some upgrades!

 

In reality the 15% pulley is only 1% smaller. It does give extra torque but only 1 or 2 lb-fts. You are also forgetting that the JCW has a gas flowed head, which adds torque as well.

 

These aren't technically "official" but here's what I ran on my G-Tech before and after......

Stock....
0-60 = 8.54-8.66
1/4 mile = 16.592 @85MPH

MTH Mod and Mini Mania Intake

0-60 = 8.11
1/4 mile = 16.457 @87MPH

Like I said before, technically this isn't official but it does back up some extra HP produced by the MTH upgrade and Mini Mania intake. Plus, driveability is enhanced and the car is more fun to drive.

BTW- My stock runs were tested in 60 and 66 degree weather while my "modded" runs were tested in 81 degree weather. Either way, once I throw my Rspeed exhaust back on and test the car in some cooler weather I might see a lower 16 in the qtr mile......My opinion, I seriously doubt a Cooper will break into the 15's without some serious mods....including nitrous.

Stuart

 

Thanks Stuart. Low 8's are pretty good times. Does the g-tech do a HP calculation?

 

That DynoJet is reading WAY high on HP, someone didn't do the SAE correction right is my guess

 

11% is the common figure used for the MINI.

 

weaverpsu - good question. My guess is the quicksilver isn't that great of an exhaust. According to that dyno, it looks like it LOSES torque. The JCW head is there to make HP, not torque. The JCW kit only adds 22 lbs of torque. A 15% pulley and a good exhaust ALONE will give you that. Add a even smaller pulley and you'll torch a JCW torque-wise (down low).

 

Which DynoJet reading is way high? For the MC's the results are about what most people seem to be getting with few mods...

As far as the MCS' are concerned, they don't seem too far fetched to me... The bone stock 2003 MCS dyno'ed (and not graphed), which is owned by one of ATS Racing's owners, ran 153-155 hp before the dyno day started...

The 'STD' correction settings were used on both the DynoJet and for these dyno charts, using the files from the DynoJet...

 

I dunno, you'll have to ask Mike Valant who owns that particular MCS... My car is an MC and I do have the Borla on my car - and it made less power than the other MC's, one with a stock exhaust and one with a different aftermarket exhaust...

For the MCS', the Quicksilver isn't the best exhaust system out there, but it is cheap.

 

A bone stock MCS usually dynos at 144-146hp.