Drivetrain (Cooper S) MINI Cooper S (R53) intakes, exhausts, pulleys, headers, throttle bodies, and any other modifications to the Cooper S drivetrain.

Drivetrain HP: At the flywheel vs. at the wheels

Old Apr 23, 2003 | 09:10 AM
  #1  
DavidR.'s Avatar
DavidR.
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For Randy or anyone,

I am a new Mini owner, in fact this is the non-truck that I have owned since 1984! One of the things I have learned here is that there is a difference between what the machine reads at the flywheel and what you actually get on the pavement.

I am planning on geting the pulley from Randy in SoCal in June or July, the quicksilver exhaust, and some brand of intake. How much of an increase in HP will I see at the wheels?

I realize that it may vary given the road surface, weather, and driving style, but there must be some kind of conversion. In my business we deal with water pressure and there is always a big difference in pressure between the source and the spigot once you get through all the pipes and backflows and such. Is this kinda the same case?

Thanks for your indulgence and information

David
 
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Old Apr 23, 2003 | 09:18 AM
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greatgro's Avatar
greatgro
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>>I am planning on geting the pulley from Randy in SoCal in June or July, the quicksilver exhaust, and some brand of intake. How much of an increase in HP will I see at the wheels?
>>

My ballpark guess would be about 25HP.

Madness intake + Quicksilver gives about 15.
Pulley mod only gives about 15.

15+15 (in car mods)~ 25HP.

The 15 from the pulley, however, will blow away the madness + quicksilver. But all three should be really sweet - you'll have to adjust to driving a completely different automobile! But somehow, I'm sure you'll adjust!
 
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Old Apr 23, 2003 | 09:30 AM
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Think about it this way: When the "power" is made in the engine, it has to go somewhere. By the time the "power" is put thru the crank/tranny/etc it loses some of it's force. Typical front/rear wheel drive cars will see a 15% driveline loss, an AWD car can see 30-40% driveline loss. Our beloved MINI appears to have around a 11-12% loss

I've got the Madness intake/pulley/Quicksilver and the car is freaking transformed. My partner calls it a caged beast now.

Greatgro's figures should be about right. Figure a baseline dyno of around 144-147hp and then go from there.

R
 
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Old Apr 23, 2003 | 01:02 PM
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Antranik
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From: Calabasas, Los Angeles
>>Typical front/rear wheel drive cars will see a 15% driveline loss, an AWD car can see 30-40% driveline loss. Our beloved MINI appears to have around a 11-12% loss
>>
>>R

Hey that 11-12% sounds great, maybe the MINI's with CVT's may have more drivetrain loss? Normally they associate automatics with a 15% loss and manuals with 12.5%. I wonder if the CVT isn't as bad as a regular automatic. I dont have one, but am still wondering about it, hehe. How does one go about figuring out the exact difference, don't all dyno's take the reading at the wheels (i dunno)? Then I wonder how much a lighter flywheel would help more power get down to the wheels.
 
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Old Apr 23, 2003 | 03:22 PM
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RandyBMC
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Davbret gave a good explanation.

We won't really know what the real drivetrain loss is until someone does a flywheel dyno pull then uses the same motor on a chassis dyno. I think 11-15% is reasonable.

Randy
 
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