E92 m3 headers x pipe

[darkbmw]

Originally Posted by 8500RPM

Thanks for the dyno and your time on this. 6% higher temps is a factor that needs to be taken into account but still not worth the trouble for a stock displacement N/A motor imo.

the other factor is cats vs non cats

[8500RPM]

Originally Posted by darkbmw

the other factor is cats vs non cats

Oh in my mind they were both catless. That does help the argument.

[pbonsalb]

The dyno result is weather corrected, but I don’t think that correction factors in power drops from timing pull due to heat. I’d accept the power gain but agree it might be higher if catless. 3 inch catted midpipe should outflow a 2.5 catted midpipe, but I don’t know about a 2.5 catless.

[wfdeacon88]

it's been posted that 5th gear is the best for Dynoing a DCT... would that make a difference?

[Dave07997S]

These results are pretty much in line what bimmerworld got with their headers. They got 11rwhp more with their headers. The real gain is that it looks like its close to 10rwhp from 5.5k rpm on up.



Dave

[JackieChiles]

Originally Posted by Dave07997S

These results are pretty much in line what bimmerworld got with their headers. They got 11rwhp more with their headers. The real gain is that it looks like its close to 10rwhp from 5.5k rpm on up.



Dave

What are the exact mods on each of the runs on that curve? Assume the first is stock.

[tdott]

Originally Posted by darkbmw

car dyno 361 whp and 278 tq.

The weather was 99.5 degrees and 39 percent humidity.

so to sum it up the car made more power with the outside temp, hotter, more humidity, and now with a cated x pipe. bellow is the dyno sheet.

car is dct
both dyno were in 4th gear

Was this dyno with AA Custom tune for the headers?

[Richbot]

Where are the cats on the ARH catted X? Which tube diameter did you go for?

[frappiculo]

Originally Posted by tdott

Was this dyno with AA Custom tune for the headers?

Yes! I was going to ask this question as well. Because technically you will have to retune the engine in order to adapt to the headers. Maybe that is why gains from the headers is only 9hp.

[darkbmw]

no same tune, i know for a fact there is more still left on the table, with a custom tune.
i just bought the cattless mids and will redyno