Markert Motor Works Dyno Thread (many inside)

[Jb325is]

Yes, I did a bad job making my exhaust. I think I am going to build something like the Bimmerworld race exhaust next so I can at least keep one of my mufflers

[nando]

You could leave the axle back portion 3.5", making the first section smaller is going to make the biggest difference.

[LJ851]

Yes, I did a bad job making my exhaust. I think I am going to build something like the Bimmerworld race exhaust next so I can at least keep one of my mufflers

It would be nice to tone it down a notch...

[digger]

i wouldnt copy bw, just build your own

[e30polak]

if you put the y-pipe that merges to 3.5" in the right spot you dont lose the bottom end anywhere near as much. seems to be more about length than size in this area of the exhaust.

http://www.m3forum.net/m3forum/showpost.php?p=1066058374&postcount=961

just maintain the twin secondaries (collector) far enough before using a Y or X and you'll be sweet

Correct. The merge is very important, and that's what ruins most s54 exhausts.

i wouldnt copy bw, just build your own

This. BW's exhaust still has consistent dynos showing poor bottom end torque, their merge is too close to the headers.

[328ijunkie]

6/10/15
Another E46M3, this one bone stock. 125k on the clock...

Progression:


Also Tuned a WAR Chiped OBD1 S50. Ended up ripping out war chip and just throwing a regular 413/chip in there when all was said and done. Car had nice headers/midsection, intake and stock other than that.

[ForcedFirebird]

...Ended up ripping out war chip and just throwing a regular 413/chip in there...

Told 'ya so. ;) :p

[nando]

wow.. the installer of that WAR chip must have wired it wrong. ;)

[ForcedFirebird]

wow.. the installer of that WAR chip must have wired it wrong. ;)

Dave hit me up about the WAR, and just happened the day before I ripped one out of a turbo m20 e30 and put in MS. I got fed up with it as well.

[squidmaster]

Whoa that's a funkkkky graph
nice numbers on the m3!

[amcp]

246 from a OBD1 S50??? color me intrigued.......
Any details on it?

[328ijunkie]

Just had generic Intake/3.5MAF/24lb injectors (Stock cams) some nice headers and exhaust.

[328ijunkie]

To continue S54 Exhaust Discussion:
Stock S54 E46 M3 vs JB's S54 E30


Also ironically: BW race Exhaust car (and highest ive ever dyno tuned) vs JB's E30 S54:

[nando]

man, don't make him feel bad about it! lol

but, 344whp is insane. let's presume that the drivetrain loss % decreases as HP goes up (because it's not linear). if it were 10% instead of 15%, that's still 382bhp from 3.2 liters!

[328ijunkie]

I was simply showing the coorelation in exhausts and low end torque....