I've got an 05 Cooper S with just a 15% underdrive pulley and the one ball mod. I'm assuming my car makes no more than 200 hp at the crank now, but I've driven many cars that are supposed to accelerate slightly quicker than my car (0-60 in 5.5-6.0 seconds) and honestly the Mini does feel legitimately stronger than all those cars. Thought I was biased because I love my car, but I had some friends drive mine and they also think it's a little quicker than it's "supposed to be". Even in short side by side pulls, I've been able to keep up with cars with a better power to weight ratio somehow.

I know BMW pretty often underrates the power of their engines, did the same go for these Mini engines? Anyone have any dyno charts?

 

Nowadays, almost every manufacturer will underrate it to prevent claims from being made that the car does not meet the rated power. A guy I know went to a dynoday with only RON 102 gasoline in his BMW 140i and these are the results:

371bhp / 590Nm (31bhp / 90Nm above rated power)

Its a dutch site, so get it through google translate https://driveaholic.nl/bmw-m140i-op-...-eeuwige-roem/



[dit]
I created this video for him back in the day. He swapped it for a Fiesta ST

 

My 2004 (factory hp rating was 168) with 380cc injectors, 15% pulley, MS5150 ECU and one-ball exhaust (tuned by Adrian) pulled 193.50hp at the wheel on a Dynojet. That equates to ~220hp at the crank. It won't come close to keeping up with my son's M340i but it's still a bunch of fun to drive.

 

feel =/= actual

you can dyno it, but a dyno is a tuning device, not a realistic proof of power.
Want to know if your car is actually quicker/stronger, take it to a drag strip.
The trapspeed is a better indication of what kind of real world power your car makes than a dyno, since trapspeed is indicative of the power the car makes moreso than the ET.

Then, you pop the timeslip into this and boom, real world hp:
https://www.ajdesigner.com/fl_horsep...trap_speed.php

I have a modified 2500lb car that trapped at 140mph. Calculator says 540hp.
Dyno says it made 610whp.

I also have a stock 4900lb car that trapped at 115mph. Calculator says 595hp.
Car is advertised with 577hp.

So, basically, dyno numbers are pointless unless you're using it to tune or compare mods.

 

Yet dynos are the industry standard for measuring HP, right? My Mini wasn't tuned on a dyno so I'm going to stick with the 193.5 at the crank reading from the Dynojet run. However, I would be interested to know the mathematic formula you're using with trap speed to calculate HP.

 

In my opinion, european cars can't be underated.I saw a lot of dyno graph made on new cars, and all results was under munufacturer numbers from 3% to 5% .I talk about Audi, BMW,GM Opel,Mercedes.I say that, because most of european car producers , use same engine with different power, only difference is inside DME software.Best example is Mini One R50 with 90hp and Mini Cooper R50 with 115hp.Same engine, no differences, only software downgrade.Same for few BMW diesels.
i can say that a lot of european cars are overated power.

 

Each dyno is different and is more a comparison tool for your own car (before and after)

 

Are you talking vehicle manufacturers? Cause, they use engine dynos... which is different from the discussion here.
Example: 383hp, 3300lb Supra vs a 394hp, 3600lb RS3
12.3 @ 113mph vs 12.2 @ 114mph
Calc above shows, assuming 180lb driver:
402hp vs 437hp
You think dynos / stated figures are honest/accurate?


By all means, you can quote that... doesn't mean your car is faster than someone with a dynojet pull of say, 170whp... or is slower than one with 240whp.
Those numbers are absolutely meaningless in the real world. However, it is extremely helpful to verify whether mods are improving the power output and tuning that power output.

It's in the link:

 

Sorry, there are just too many variables for me using your math example -- weight of the car, weight of the driver and driver ability, for instance, plus your trap speed is going to differ each run. A dyno at least eliminates those variables by employing consistent RPM and atmospheric conditions with no driver input. Under your scenario the same car driven by two different drivers would produce different HP numbers. But I do find this discussion interesting.

 

You may be misunderstanding what's being discussed here.
The discussion is using a dyno to determine acceleration, and its acceleration compared to other cars. It can't be used for either, reliably.

What the car puts down on a dyno, does not determine how fast it will be.

Also, I'm not entirely sure you understand how drag strips work. The Elapsed Time is usually used to determine how well the driver did. This is why in bracket racing, your dial-in is based on the ET, not the trap speed.
The Trap Speed is usually used to determine the power of the car, because math. You could bog the launch and still have a Trap Speed that is 2-3mph within the car's theoretical best. Driver's ability isn't a "variable", assuming the driver is WOT for most of the run. If not, then that same logic can be applied to a dyno.
DA will affect both trap and ET, but less so for boosted vehicles. DA affects dynos too.

Yes, overall vehicle weight with driver plays a role -- how often are you running acceleration tests without a driver?


Not necessarily.
Let's inverse this line of thinking... two cars dyno at 200whp. Which one will accelerate faster -- since this is what the topic is about ? Too many variables?
Ok, two cars run the quarter mile. Car A does 13.8 @ 99mph; Car B does 14.5 @ 103mph. Which car makes more power? [Whispers: it's Car B].

 

Honestly, these motors are pretty weak. Even modded with the standard stuff....200-22hp is about max. Most 4-door family sedans are making 300++hp today....and will leave a modded R53 in a hurry.

These cars are great at handling.....they are fun to drive....they are not speed demons.