pugguy2001

As I was searching the boards, as I always do, I came across these 2 dyno results. Both are from the M271 engine, both have the Kleemann pulley kits with the k-box, now here is the differnce, the first picture attached has the Kleemann header & the second picture attached has the MGHeader. Which dyno results are better? Which dyno shows more torque. I personally would rather have more torque than horse power.

white_w203

obviously there isn't a lot of fluctuations on the kleemann tuned vehicle whereas the second dyno is jumping all over the place.

you want a steady climb like the kleemann one where hp and torque is used efficiently.

the second dyno has power as well but not throughout all RPM's where it drops then goes up and then drops again.

e1000

The broad torque plateau is very desireable as seen in the first pic. The "area" under the curve is as important, if not more important than peak torque/hp numbers. It dosen't look like the second car is tuned properly or it was a bad dyno run.

pugguy2001

Oh ok that does make sense. So you are saying even thought it looks like the MGHeader has more vroom ( so to say), you are actually losing that constancy of throughout power. Also I was told Kleemann is still working on there ECU upgrade so dyno results should be even better.

e1000

actually, there is something VERY wrong about the second dyno chart. the torque and hp curves are supposed to cross at 5252rpm just like both of the runs done on the first dyno chart. The second chart shows that they cross at well below that, which should not happen.

nuclearhappines

they only corss @ 5252 if power is displayed in horsepower and torque is displayed in ft-lbs.

when torque is displayed in N-m or when hp is displayed in KW or BHP ..or when the hp and torque axes aren't equaly (like one is showing 0-200hp and torque is showing 0-150 for example) they won't cross @ 5252 ...

5252 is the magic number that comes from the math that relates horsepower to foot-lbs... if you use inch lbs then there's a factor of 12 in there and thus they'll cross @ some other rpm that is a function of 5252 rpms and 12 inches per foot)

make sense ?


the two dynos don't compare... the kleeman one was done on a C230 which is a low compression ratio car... the mg one was done on a c200 which has a higher static compression ratio

in other words...

c230 + kleeman kit = ~203 hp
c200 + kleeman kit = ~210 hp

as long as you stay out of detonation, the car with higher static compression ratio should make more power on the same engine setup ...

that's probably why it peaks higher...

e1000

oops - didn't notice that the bottom dyno was done in n-m instead of ft-lbs.