[ni8shadow]

forums.bimmerforums.com/forum/showthread.php?t=1356679

"Ye of little faith.". Folks there doubt the gains of a pbx. One member states that when the ecu adapts to the pbx, you probably get a lower gain, or even a loss of power. Anyone dyno a pbx after the ecu fully adapts?

[vachss]

Worth noting that some dyno runs for the PBX not conducted by BMS appear to show significantly less gain: http://www.e90post.com/forums/showthread.php?t=359146 . I think nobody doubts the effectiveness of the throttle remap. The debate on bimmerforums is only about the hp gains of the tune - which I suspect is really the smallest part of what most PBX enthusiasts are feeling.

[ni8shadow]

Maybe need some dynos after ecu adapts to see for sure. I think one guy said he did do one after ecu adapted and he gained 7hp.

[c_jeong89]

well like with any performance mod the ecu needs to adjust...so ideally it would be best to dyno after the cu has adjusted

[zuluZero]

Originally Posted by ni8shadow

forums.bimmerforums.com/forum/showthread.php?t=1356679

"Ye of little faith.". Folks there doubt the gains of a pbx. One member states that when the ecu adapts to the pbx, you probably get a lower gain, or even a loss of power. Anyone dyno a pbx after the ecu fully adapts?

Meh. You'll likely be more skeptical when you're as old as a Z driver too

Seriously, they were asking some good questions, and pointing out rightly that there's been little empirical data beyond butt dyno's from people who'd never tried throttle mapping before. Sure, we're quibbling over peanuts in terms of HP & TQ, but people take a keen interest in the principle of the matter.

I think Terry @ BMS gave an interesting response to the thread, leaving the door open to NA tuning. I may have misunderstood, but essentially saying that the ECU cannot adjust to a tune if it doesn't know about it. (you can fool it's sensor readings, in addition to controlling the F/A mixture and timing, etc)

[Mike@N54Tuning.com]

Originally Posted by vachss

Worth noting that some dyno runs for the PBX not conducted by BMS appear to show significantly less gain: http://www.e90post.com/forums/showthread.php?t=359146 . I think nobody doubts the effectiveness of the throttle remap. The debate on bimmerforums is only about the hp gains of the tune - which I suspect is really the smallest part of what most PBX enthusiasts are feeling.

Another car at our dyno day up here had larger gains of 7-8rw. Keep in mind octane, weather, etc, will all impact the improvement. If it's cold and you're on relatively high octane like 94 you won't see as much as someone who is in hotter weather on 91 octane. But there is definitely an improvement to be had and most will agree the power gains are simply an added bonus with the PBX.

Mike

[AKbmw]

even if its proven that i get 0hp out of it, i would still buy one just because the reviews that i read the car sounds like it will be more fun to drive specially in a 6mt with better throttle response. face it, unless you have big bucks the 328 is not going to be a fast car compared to a 335 (im comming from a jb3 335 to a 328)

[Speedracer07]

Originally Posted by vachss

Worth noting that some dyno runs for the PBX not conducted by BMS appear to show significantly less gain: http://www.e90post.com/forums/showthread.php?t=359146 . I think nobody doubts the effectiveness of the throttle remap. The debate on bimmerforums is only about the hp gains of the tune - which I suspect is really the smallest part of what most PBX enthusiasts are feeling.

that was my pull!! I think the tires were the big problem, I was running Blizzak tires and they are very soft...

I'm actually trying to get a pull on a dynapack to completely eliminate the wheels/tires as a variable and there is a chance it might be tonight... The numbers wont be "true WHP" but hopefully it's enough to conclusively show the gains of the performance tune.

If I get it done tonight I'll post it up immediately.

R

[ni8shadow]

Keep us updated.

[ni8shadow]

Awesome vid Terry! Need to have one of those for the 325i/8i/30i. Shoot maybe I'll try doing it

http://forums.bimmerforums.com/forum....php?t=1356679 It's under post #13

[ghosthi32]

Originally Posted by vachss

Worth noting that some dyno runs for the PBX not conducted by BMS appear to show significantly less gain: http://www.e90post.com/forums/showthread.php?t=359146 . I think nobody doubts the effectiveness of the throttle remap. The debate on bimmerforums is only about the hp gains of the tune - which I suspect is really the smallest part of what most PBX enthusiasts are feeling.

i dont think he was using map 3.

[vachss]

Originally Posted by ghosthi32

i dont think he was using map 3.

No, he was using map 7, which should only differ from map 3 in throttle sensitivity - not in "tune" or hp.

BTW. I would think that poor tires could affect the overall hp measured, but would still allow for a valid comparison between map 0 and map 7.

[Alexander]

A bunch of old farts over there....

[Delta0311]

Originally Posted by ni8shadow

forums.bimmerforums.com/forum/showthread.php?t=1356679

"Ye of little faith.". Folks there doubt the gains of a pbx. One member states that when the ecu adapts to the pbx, you probably get a lower gain, or even a loss of power. Anyone dyno a pbx after the ecu fully adapts?

No offense to you but that makes ZERO sense. You mean to tell me that you lose all your gains once the ECU adapts? That would probably defeat the purpose of a JB3 for the N54 engine.

[ni8shadow]

Originally Posted by Delta0311

No offense to you but that makes ZERO sense. You mean to tell me that you lose all your gains once the ECU adapts? That would probably defeat the purpose of a JB3 for the N54 engine.

That's what I thought as well so I decided to post here to see what the folks here think. I think they believe that once the ECU adapts, then it will try and force the stats back stock.