[Taskmaster]

Originally Posted by Ruddigger

Thanks. Before I email them, are there any steps I can take to troubleshoot a possible physical cause possibly unrelated to the tune?

Reset adaptations and make sure maintenance is up to date.

[Ruddigger]

I did, and it is. My mileage has gone pretty bad lately too.

Anyway, I dont want to clutter up the dyno thread with non dyno related talk. I'll have headers and the header tune on soon, if the richness really is due to cat protection, maybe it will go away then. Somehow I doubt it though

[tlow98]

Shows solid gains. Thanks for posting.

What made you go AA over BPC? Just wondering. Contemplating similar.

[Ruddigger]

The BPC tune wasnt really known about when I bought the tune. Now I would have gone wih them.

[Kgolf31]

Meh. I'm bored so I'll contribute.

[RyanDavies]

Still can't believe you lost all that power putting the merge so far forward! Gosh!

.

[hassmaschine]

I'll bet the torque drop is due to the merge placement - way too close to the headers. put it closer to the rear axle and you'll get all that torque back. the size after the merge isn't that important.

[Taskmaster]

Originally Posted by hassmaschine

I'll bet the torque drop is due to the merge placement - way too close to the headers. put it closer to the rear axle and you'll get all that torque back. the size after the merge isn't that important.

That's verbatim what I stated. Kgolf had to compromise because of the way he was routing his exhaust - but he gained power, and lost nothing. Everyone wins.

[Kgolf31]

Originally Posted by TheAxiom

That's verbatim what I stated. Kgolf had to compromise because of the way he was routing his exhaust - but he gained power, and lost nothing. Everyone wins.

Zero Torque loss though. I don't call that a compromise

[hassmaschine]

yeah on my other car, I put it right by the headers. that was a mistake. It didn't lose much torque but I ended up not gaining anything either. I'll redo it with the new motor though and put it as far back as possible.

[Taskmaster]

Originally Posted by hassmaschine

yeah on my other car, I put it right by the headers. that was a mistake. It didn't lose much torque but I ended up not gaining anything either. I'll redo it with the new motor though and put it as far back as possible.

Well, it doesn't have to be THAT far back.

[Kgolf31]

I think people forget that one company merge =/= other company merge

[hassmaschine]

Originally Posted by TheAxiom

Well, it doesn't have to be THAT far back.

somewhere close to the rear subframe is actually pretty good for an inline BMW 6 cyl. I mean, a bit closer to the engine doesn't hurt too bad, but you can have a better torque curve without sacrificing much top end power.

Theoretically you could put it further back but it gets a lot more difficult once you get past the subframe..

[Taskmaster]

Originally Posted by Kgolf31

I think people forget that one company merge =/= other company merge

That merge pipe on the Z4 was mine, I got it from Burns stainless.

[RyanDavies]

Uh, we have the same design. It's immediately after the headers, before the location of stock secondaries / before the bend. Still fine . Obviously a huge torque loss!

[RyanDavies]

Ours merge immediately after the header flange. Maybe 4in back, before any other bend, well before trans tunnel.

[Taskmaster]

Originally Posted by RyanDavies

Ours merge immediately after the header flange. Maybe 4in back, before any other bend, well before trans tunnel.

Not from what I saw on the pictures.

[RyanDavies]

You're wrong then.

[3002 tii]

Originally Posted by TheAxiom

No, I'm not.
http://www.e90post.com/forums/showth...1232716&page=6



Pretty sure that's right at the first bend, like I stated.

You're such a prick about this lol. Who cares who places what where? People mod their cars how they want, why do you care?

[Taskmaster]

Originally Posted by 3002 tii

You're such a prick about this lol. Who cares who places what where? People mod their cars how they want, why do you care?

Please tell me you're not serious.

[3002 tii]

Originally Posted by TheAxiom

Please tell me you'renot serious.

I am to the extent I meant what I wrote but not in the sense you are with merge placements. But I'm sure if we took a quick poll we'd see if others felt the same way or not.

[RyanDavies]

Originally Posted by TheAxiom

No, I'm not.
http://www.e90post.com/forums/showth...1232716&page=6



Pretty sure that's right at the first bend, like I stated.

The merge starts immediately after the header flange. You can see the bracket that is *right* after the flange in the front of your picture. You could not physically make it any closer to the header flange.

Were you expecting the merge inside of the header on mine or what? You were on about it being back probably 5 feet from this or "zomgztorqueloss", which clearly doesn't happen on the dyno.