[aaaugustine29]

I am about to go stage 2 Cobb on my n55, and I am a technical guy, and I noticed something. The stage 2 aggressive and stage 1 aggressive maps seem to be almost identical in terms of parameters and load request. I was curious if there is something I was missing and somebody could clear that up, or if im correct and there really is no difference. Thanks! and if this has been addressed before, I couldn't find it, so sorry.

[olivojoe]

Originally Posted by aaaugustine29

I am about to go stage 2 Cobb on my n55, and I am a technical guy, and I noticed something. The stage 2 aggressive and stage 1 aggressive maps seem to be almost identical in terms of parameters and load request. I was curious if there is something I was missing and somebody could clear that up, or if im correct and there really is no difference. Thanks! and if this has been addressed before, I couldn't find it, so sorry.

Not sue about technical parameters and performance gains, but I know it does keep the DME from searching for the O2 sensor fault that comes with the Cat-less DP, so you won't get the SES light every time you touch the throttle...

[feignaw]

I don't have ATR in front of me right now to compare the maps, but check out the map notes to see what each was designed to do:
https://cobb.app.box.com/BMW-N55-Map-Notes

It says stage1 and stage2 are designed to make close to the same boost levels and their expected power improvements are the same.

[aaaugustine29]

Thats really interesting to me. Why have the downpipe if both of the maps are the same? I had always heard that a downpipe unlocked a decent amount of horsepower with the proper map (20+whp). Any possibility this is a mistake from cobb?

[Longdoggy]

That is a bit odd. But I suppose it's just easier on the turbo with the DP due to improved flow.

Stage 1 aggressive does have some nice kick to it.

[Longdoggy]

So I was driving around this morning and my cobb OTS stage 1 aggressive map peaked at 15.4 psi of boost. And I really was not gunning it.

[mike@x-ph.com]

Cant check the map on my ATR because i have an N54 but go to boost control table -> WGDC -> and check the main table , P and I and D.
These 4 tables control boost, i am positive that for the stage 2 they are more aggressive.

[classyfast]

Great question Op was thinking the same thing when i saw the parameters. Now my question is if I'm stock dp and fmic then chose to run the stage 1+ fmic (or if that's stage 2) with just a cp, 93 Oct, and exhaust......would I have problems?

My mode of thinking is that stage 1+ fmic ups the boost a bit to compensate for fmic pressure drop, but since the stock fmic is decent I was thinking that would just up my boost for a bit more power?? Was going to experiment with that or protune!! What do you guys think?

[Longdoggy]

Originally Posted by classyfast

Great question Op was thinking the same thing when i saw the parameters. Now my question is if I'm stock dp and fmic then chose to run the stage 1+ fmic (or if that's stage 2) with just a cp, 93 Oct, and exhaust......would I have problems?

My mode of thinking is that stage 1+ fmic ups the boost a bit to compensate for fmic pressure drop, but since the stock fmic is decent I was thinking that would just up my boost for a bit more power?? Was going to experiment with that or protune!! What do you guys think?

I'm curious on this too. Can I run FMIC Stage 1+ with stock FMIC. I mean it is a decent FMIC I suppose. So why not for a little extra boost?

Try it and let me know how it goes. Lol

Also I was doing some driving and testing last night. Stage 1 aggressive peaked at 16.6psi

[Aaron_N55]

Are those peaks because of throttle closure? Because sometime I data log and the peak due to throttle closure would be like 17PSI. However in reality the logs show like 10ish-12ish.

[Longdoggy]

Originally Posted by Aaron_N55

Are those peaks because of throttle closure? Because sometime I data log and the peak due to throttle closure would be like 17PSI. However in reality the logs show like 10ish-12ish.

Yea peaks

[surfcali]

I've been running Cobb Stage 1 Sport + FMIC without an aftermarket FMIC. Much more power. You'll love it.

[classyfast]

Originally Posted by Longdoggy

I'm curious on this too. Can I run FMIC Stage 1+ with stock FMIC. I mean it is a decent FMIC I suppose. So why not for a little extra boost?

Try it and let me know how it goes. Lol

Also I was doing some driving and testing last night. Stage 1 aggressive peaked at 16.6psi

I tried it tonight, pretty awesome on stg 1 aggressive + fmic (with stock fmic)! Try it

[akerns429]

I have been doing some research and chatted with Cobb as well. It sounds like the difference between Stage 1 Aggressive and Stage 2 (Which the downpipe is recommended) would be the torque. Looking at a couple of their dyno charts, they are only getting maybe 1 more HP with Stage 2, but the torque is around 400 ft. lbs.

I just installed stage 1 aggressive yesterday and you can definitely feel a difference compared to stock! The throttle response is much more responsive and it feels like it pulls much harder throughout the entire power band. I used the built in 0-60 and quarter mile time and my 0-60 was 4.6 seconds with a 13.2 sec. 1/4 mile time @ 106 mph. Not sure how accurate it is, but I'm sure it's close. I think with the downpipe and stage 2, I'll be under 13 seconds.