[SeanWRT]

Originally Posted by amw896

Sean, I have this exact car with downpipe and IC installation date set for middle of May. I'm actually driving to PTF HQ for BM3 install and dyno run soon after. I will definitely report back on my results. Should be around early to mid June, work schedule pending. stay tuned!

In for the update.

[HKD126]

Same!

[wjjkoevoets]

Any updates on this? Would love to see a run with FMIC.

I'm considering going BM3 next year with:
- Mods mentioned in my signature
- Wagner EVO2 Competition FMIC
- AKI95 / RON102

Sounds like it could be fun

[wjjkoevoets]

proTUNING Freaks bump!

[BimmerFan]

Originally Posted by sicmadek

Must be on stock fuel system

Nah, Stage 2 LPFP from Fuel-it! but the port injection was inactive.

[amw896]

Originally Posted by wjjkoevoets

Any updates on this? Would love to see a run with FMIC.

I'm considering going BM3 next year with:
- Mods mentioned in my signature
- Wagner EVO2 Competition FMIC
- AKI95 / RON102

Sounds like it could be fun

I have one posted in the 2 series forum. Not sure how to link from mobile.

[wjjkoevoets]

Originally Posted by amw896

I have one posted in the 2 series forum. Not sure how to link from mobile.

Thanks, I should be able to find it

[digisides]

what BM3 tune was used on the car in this thread? Was is a Stage 1 93 octane tune?

per my discussions with protuningfreaks an FMIC is REQUIRED before you can run stage 2.

My question- I plan to use BM3 on my m235i with MPE. Is there any benefit to installing a catted downpipe and running Stage 1 or will the gains be nominal?

[JaredG_F30]

gains will be minimal with between stage 1 stock cat and stage 1 cat hi flow dp. If you're running stage 1 don't worry about spending $800 on a catted hi flow dp, just run stock.

Originally Posted by digisides

what BM3 tune was used on the car in this thread? Was is a Stage 1 93 octane tune?

per my discussions with protuningfreaks an FMIC is REQUIRED before you can run stage 2.

My question- I plan to use BM3 on my m235i with MPE. Is there any benefit to installing a catted downpipe and running Stage 1 or will the gains be nominal?

[EDWYER]

Originally Posted by FSociety

https://bootmod3.atlassian.net/wiki/...ons+-+bootmod3

Updated bootmod3 FAQ page.

https://bootmod3.atlassian.net/wiki/...-+bootmod3+FAQ

[enemigo13]

aftermarket FMIC is never 100% required. If you're doing pulls e.g. in minus 10 degrees C ambient, your IAT probably will be ~25 degrees C at the end of the long pull, considering stock IC has less pressure drop, probably you will do pull even in shorter time. If you'll do the same pull at 25-30 degrees C ambient, you will get 70-80 degrees C at the end of the pull which is not acceptable (average aftermarket will have 35-40C IAT after same pull) and result 30-40hp power loss. One more disadvantage of aftermarket IC that it will heatsoak much more than stock in the stop-go city traffic as its fully metal and some guys use not only metal CP but also metal boost pipe going from turbo which catches heat from engine bay more. Check that most car manufacturers don't do intercoolers with metal connections, most of them are plastic and it's not because of saving money lol. To summarize all of this- big aftermarket IC is not always win/win situation, like some of their sellers trying to convince you in this forum stock m2 with stock ic (which is 1:1 the same for all F2x/F3x series N55 engines) and stock dp does Nordschleife in 7 seconds better than e92 m3, so it heatsoaks, but not that bad like IC sellers try to tell you ) if you're running under M2 power (like pwg stage 2), probably you don't need aftermarket IC at all. aftermarket FMIC basically does not add power it just keeps power for a longer time than stock OEM FMIC.

Originally Posted by digisides

what BM3 tune was used on the car in this thread? Was is a Stage 1 93 octane tune?

per my discussions with protuningfreaks an FMIC is REQUIRED before you can run stage 2.

My question- I plan to use BM3 on my m235i with MPE. Is there any benefit to installing a catted downpipe and running Stage 1 or will the gains be nominal?

[skarimi]

Sorry to post to an old thread..
M235i MT has a ZF S6-45 transmission which I believe is rated for max 470Nm(346 ft.lbs) of torque. Has this ever been looked at and/or investigated?
I have been wanting to do the same Stage 2 flash on my 435i and I have the same transmission so I have been looking around to find answers to the torque rating limitation.

[DreamerJoe]

Originally Posted by skarimi

Sorry to post to an old thread..
M235i MT has a ZF S6-45 transmission which I believe is rated for max 470Nm(346 ft.lbs) of torque. Has this ever been looked at and/or investigated?
I have been wanting to do the same Stage 2 flash on my 435i and I have the same transmission so I have been looking around to find answers to the torque rating limitation.

you might see some clutch slip in stage 2, I'm running MHD stage 2+ and my clutch is holding up okay. you're more likely to slip in the e maps. if you do upgrade your clutch, look into the 335is clutch, it is a direct replacement and will hold the power, even up to PS2 if I'm not mistaken.. beyond that you will need a spec clutch and single mass flywheel, higher HP tends to throw faulty misfire codes with the stock DMFW. and although you may see some benefits to getting a SMFW just being FBO, you introduce chatter during idle without the clutch depressed.

[thejeremyman9]

Originally Posted by skarimi

Sorry to post to an old thread..
M235i MT has a ZF S6-45 transmission which I believe is rated for max 470Nm(346 ft.lbs) of torque. Has this ever been looked at and/or investigated?
I have been wanting to do the same Stage 2 flash on my 435i and I have the same transmission so I have been looking around to find answers to the torque rating limitation.

Post above is correct in the sense that the clutch is the weak link and not the actual trans. The BM3 OTS tunes are right around the limit of what a worn stock clutch can hold, but the transmission/gears/etc can hold significantly more power. Depending on your cars history (launches, etc), your clutch may slip immediately under high load in higher gears, or it may hold up OK for a while.

[skarimi]

Originally Posted by DreamerJoe

you might see some clutch slip in stage 2, I'm running MHD stage 2+ and my clutch is holding up okay. you're more likely to slip in the e maps. if you do upgrade your clutch, look into the 335is clutch, it is a direct replacement and will hold the power, even up to PS2 if I'm not mistaken.. beyond that you will need a spec clutch and single mass flywheel, higher HP tends to throw faulty misfire codes with the stock DMFW. and although you may see some benefits to getting a SMFW just being FBO, you introduce chatter during idle without the clutch depressed.

Thank you for the information. I will look into different clutch options. Are there any advantages to go with spec stage 2 DMFW over the 335is clutch? I would be curious to find out the torque ratings of each.

Originally Posted by thejeremyman9

Post above is correct in the sense that the clutch is the weak link and not the actual trans. The BM3 OTS tunes are right around the limit of what a worn stock clutch can hold, but the transmission/gears/etc can hold significantly more power. Depending on your cars history (launches, etc), your clutch may slip immediately under high load in higher gears, or it may hold up OK for a while.

Thank you. I had seen/read that people are talking about only the clutch upgrades and not the transmission, so I had thought that possibly clutch would be the limiting factor but couldn't verify it. It is strange that torque rating on a transmission would be de-rated because of an accompanying clutch. One would think that the rating on the transmission would be reported accurately and rating for the clutch separately leaving the user to realize there is a bottle neck. Out of curiosity, do you know if there is solid documentation supporting the higher torque ratings of the transmission itself?

[thejeremyman9]

Originally Posted by skarimi

Thank you for the information. I will look into different clutch options. Are there any advantages to go with spec stage 2 DMFW over the 335is clutch? I would be curious to find out the torque ratings of each.



Thank you. I had seen/read that people are talking about only the clutch upgrades and not the transmission, so I had thought that possibly clutch would be the limiting factor but couldn't verify it. It is strange that torque rating on a transmission would be de-rated because of an accompanying clutch. One would think that the rating on the transmission would be reported accurately and rating for the clutch separately leaving the user to realize there is a bottle neck. Out of curiosity, do you know if there is solid documentation supporting the higher torque ratings of the transmission itself?

I am not aware of any official documentation of the "actual" torque rating of the transmission. You could look it up by model number and see if ZF has anything, or another option would be to see what other cars/models it is used in and what their factory power rating is. Your best bet is probably anecdotal evidence. I wouldnt be worried until well over 500HP since plenty of people run PS2 on it. I am not sure if its the same trans as the N54 but i have seen 700+ whp on the N54 manual trans.

[skarimi]

Originally Posted by thejeremyman9

I am not aware of any official documentation of the "actual" torque rating of the transmission. You could look it up by model number and see if ZF has anything, or another option would be to see what other cars/models it is used in and what their factory power rating is. Your best bet is probably anecdotal evidence. I wouldnt be worried until well over 500HP since plenty of people run PS2 on it. I am not sure if its the same trans as the N54 but i have seen 700+ whp on the N54 manual trans.

Fair Enough... I appreciate the info anyways. From the anecdotal evidence as you put it , I am leaning towards the 335is Clutch (21-20-7-603-248) since I have read it is rated up to around 500 ft-lbs of torque. I have seen that people have posted that they have easily swapped this over on their F30/F32 with no issues.

However, I am not sure if I should keep my OEM flywheel (I would probably replace it with a new one when I am changing the clutch) or should I also get the flywheel for 335is. They are different part numbers:
F32 435i: 21-20-7-640-733
E92 LCI 335is: 21-21-7-603-616

Not sure if you know the about the differences or anyone else can chime in