E9x M3 Dyno Curve?

[M3SQRD]

I came across this e9x M3 dyno curve on a forum vendor’s website. It was used to define peak hp and torque values as well as typical gains across the rpm band from a S65 ECU tune being sold by this vendor.

Peak Power: 20 whp @ 8300 rpm
Peak Torque: 20 lbf-ft (not specified)

Typical gains (copied directly from the website):
25hp @ 5000-6500rpm, 20lb.ft @ 4000-6000rpm

Do you see any issues with this before-after e9x M3 dyno comparison plot?

Crap - resolution is too low (fixed)

[Green-Eggs]

Without the X-axis, it's hard to tell if anything is wrong with it. The X-axis doesn't always have to be RPM, sometimes in can be speed. If the X-axis were speed, and the runs were in two different gears, then nothing is wrong (other than running in two different gears). If the X-axis is RPM, then yes, there are some obvious problems like the baseline not being a full run to max RPM. But without the X-axis, you can't really tell much.

[M3SQRD]

Originally Posted by Green-Eggs

Without the X-axis, it's hard to tell if anything is wrong with it. The X-axis doesn't always have to be RPM, sometimes in can be speed. If the X-axis were speed, and the runs were in two different gears, then nothing is wrong (other than running in two different gears). If the X-axis is RPM, then yes, there are some obvious problems like the baseline not being a full run to max RPM. But without the X-axis, you can't really tell much.

Sorry..I quickly uploaded a new picture. I’ll fix it. Thanks!

[M3SQRD]

Originally Posted by Green-Eggs

Without the X-axis, it's hard to tell if anything is wrong with it. The X-axis doesn't always have to be RPM, sometimes in can be speed. If the X-axis were speed, and the runs were in two different gears, then nothing is wrong (other than running in two different gears). If the X-axis is RPM, then yes, there are some obvious problems like the baseline not being a full run to max RPM. But without the X-axis, you can't really tell much.

Fixed

[Green-Eggs]

It mostly looks normal now that we can see it in context. HP=TQ at 5252 right where it should. The tuned clearly had the RPM limiter raised. Even the numbers are right in line with the s65dynos.com database. The only thing I see is that the stock pull didn't got above 7900/8000 RPMs.

[DrFerry]

http://www.s65dynos.com/

[M3SQRD]

Originally Posted by Green-Eggs

It mostly looks normal now that we can see it in context. HP=TQ at 5252 right where it should. The tuned clearly had the RPM limiter raised. Even the numbers are right in line with the s65dynos.com database. The only thing I see is that the stock pull didn't got above 7900/8000 RPMs.

Is the shape of the torque curve typical for a s65? I haven’t looked at that many but I’ve seen a torque curve similar to this one.

[M3SQRD]

Originally Posted by DrFerry

http://www.s65dynos.com/

Yes, I’m aware of the database and the 15 stock curves I randomly looked at all had similar torque curves and none looked like the torque curve above.

[Redd]

Torque looks like my own car - peak at 4k, largely flat, and starts to drop at 7k.

[M3SQRD]

Originally Posted by Redd

Torque looks like my own car - peak at 4k, largely flat, and starts to drop at 7k.

Really? I haven’t seen a s65 torque curve that has a double hump at low rpm and then starts to drop off at 4.5k rpm. I’m used to seeing torque curves that look similar to the ones below. Also, it’s odd no additional power/torque developed in a tune until around at 4.5-5k.

[gh0stE92M3]

Here’s mine