[inevitab1e]

Title says it all, I want to try the F-series N55 PWG bef on my E82. I'd assume I'd have to update the JB4 to F-series fw as well as the BEF.

[C2YT]

I'm going to go out on a limb here and say that they are designed for E/F individually for a reason. There might be some cross over with the F-Series PWG, but I wouldn't personally take a risk. This is a question I would send straight to Terry at BMS.

Why are you looking at the F-Series BEF anyways?

[Kevin39]

Yeah that just sounds like a bad idea. Can't really think of any good reason to try it anyways

[inevitab1e]

Originally Posted by C2YT

I'm going to go out on a limb here and say that they are designed for E/F individually for a reason. There might be some cross over with the F-Series PWG, but I wouldn't personally take a risk. This is a question I would send straight to Terry at BMS.

Why are you looking at the F-Series BEF anyways?

The issue is there are 2 types of engines for the 135i.

The N55 in my vehicle matches those listed for the F-series BEF. The E-series BEF lists vehicles like the regular 135i.

It appears this engine needs the F-series tune, not the E-series tune.

N55B30 - (my engine, same N55 in F-series)
N55B30M0 - (normal N55 135i engine for E-series)

[C2YT]

Ah I see, but it is still an E-series. Interesting find though. You might bet more support posting to n54tech where Terry and his team monitor.

[inevitab1e]

Originally Posted by C2YT

Ah I see, but it is still an E-series. Interesting find though. You might bet more support posting to n54tech where Terry and his team monitor.

Ya, this is a very rare scenaio. This 135is version has a different engine than the E92's and E82's. So I've got essentially a F20 engine in my E82.

When you look at the JB4/MHD applications, the F-series lists the M135i, not the 135is. This car is listed under the E-series applications, but the engine is different?

So the question is, how do you flash an E-series vehicle that has the engine application that matches the F-series N55 PWG?

I tried flashing the Fseries BEF, but the app wouldn't allow me.

[lucasmiller2015]

Can you post or PM me the last 7 of your VIN?

[inevitab1e]

Originally Posted by lucasmiller2015

Can you post or PM me the last 7 of your VIN?

VM13862

It's definitely the "is" version of the 135. And the "is" version is the only 135i to have a different N55 engine code.
I think the version I have is higher output than the normal 135i N55.

[weehe126]

It should come down to what DME you have. Not the engine version.

[lucasmiller2015]

Originally Posted by inevitab1e

VM13862

It's definitely the "is" version of the 135. And the "is" version is the only 135i to have a different N55 engine code.
I think the version I have is higher output than the normal 135i N55.

The page on Wikipedia isn't quite correct, there is no "N55B30" variant. All engine designations are 8 characters (the 7th is performance class and can be "K" ["smallest"], "U" ["lower"], "M" ["medium"], "O" ["upper"], "T" ["top"], or "S" ["super"]). According to ISTA/D (BMW dealer software) you have the N55B30M0, which is the same as my 2011 E90 N55. The F20 has the N55B30O0 variant.



You have the same DME as the rest of the Exx N55's (I know it says 135i, not 135is, but this page is correct for your VIN):



The early F-chassis N55 uses the same MEVD1726 DME, but it's a different part number:



All that aside, I don't think the F-chassis JB4 firmware and/or BEF is the correct solution. Both the JB4 and MHD are the same for all performance variants of the N55, as the hardware is the same. The only difference is a setting in the DME that specifies which power level to have (and this parameter can only be set once - when the engine/DME are brand new).

Is there a specific issue you're trying to solve? Is the E-chassis JB4 / MHD not working properly?

[inevitab1e]

Originally Posted by lucasmiller2015

The page on Wikipedia isn't quite correct, there is no "N55B30" variant. All engine designations are 8 characters (the 7th is performance class and can be "K" ["smallest"], "U" ["lower"], "M" ["medium"], "O" ["upper"], "T" ["top"], or "S" ["super"]). According to ISTA/D (BMW dealer software) you have the N55B30M0, which is the same as my 2011 E90 N55. The F20 has the N55B30O0 variant.



You have the same DME as the rest of the Exx N55's (I know it says 135i, not 135is, but this page is correct for your VIN):



The early F-chassis N55 uses the same MEVD1726 DME, but it's a different part number:



All that aside, I don't think the F-chassis JB4 firmware and/or BEF is the correct solution. Both the JB4 and MHD are the same for all performance variants of the N55, as the hardware is the same. The only difference is a setting in the DME that specifies which power level to have (and this parameter can only be set once - when the engine/DME are brand new).

Is there a specific issue you're trying to solve? Is the E-chassis JB4 / MHD not working properly?

Thanks for the detailed information. It is strange how Wiki had my vehicle completely separate from the normal 135i's. I wonder what would happen if I flash the N55B30O0 tune. Not even sure it's available.

Problem I've been having since getting my DME unlocked and loading MHD is that my Trims are sticking at 25 when WOT. Sending my AFR's super rich on tip-in. After a few seconds, the TRIMS signal goes to normal and sends my HPFP crashing.

I've replaced all fueling parts and upgraded. Everything has been attempted to rectify this problem. Trying to have a custom BEF done by trebila and we're all stumped as to why this vehicle is acting differently.

This may be the first 135is that's been setup for a BEF w/ JB4. So not sure there's been any testing. I'd love to try a late E-series BEF that's setup for the M135i N55 PWG engine. Just to rule it out. I've tried everything and we're at a dead end road.

[WeekendWarriorz]

Originally Posted by inevitab1e

Thanks for the detailed information. It is strange how Wiki had my vehicle completely separate from the normal 135i's. I wonder what would happen if I flash the N55B30O0 tune. Not even sure it's available.

Problem I've been having since getting my DME unlocked and loading MHD is that my Trims are sticking at 25 when WOT. Sending my AFR's super rich on tip-in. After a few seconds, the TRIMS signal goes to normal and sends my HPFP crashing.

I've replaced all fueling parts and upgraded. Everything has been attempted to rectify this problem. Trying to have a custom BEF done by trebila and we're all stumped as to why this vehicle is acting differently.

This may be the first 135is that's been setup for a BEF w/ JB4. So not sure there's been any testing. I'd love to try a late E-series BEF that's setup for the M135i N55 PWG engine. Just to rule it out. I've tried everything and we're at a dead end road.

I think I know what's going on with your car, You're a Late E series which we share the same fuel system as the F series, in terms we have the hpfp that's weaker since it's more reliable. Which BEF are you using the pump or e85? and I'm assuming that you've played around with the FOL? Has trebila played with your fuel scalers? My car I've had the BMS pump and E85 BEF adjusted slightly so it can run fine. Our cars fueling situation is the issue. And your car has the same DME as any other e series n55 that's made past 03/2012. Nothing different than that. Using a F series PWG flash could work but I'm not sure if there are any other settings that need to be altered, we have the same exact turbo/hardware as the PWG models only.

[inevitab1e]

Originally Posted by WeekendWarriorz

I think I know what's going on with your car, You're a Late E series which we share the same fuel system as the F series, in terms we have the hpfp that's weaker since it's more reliable. Which BEF are you using the pump or e85? and I'm assuming that you've played around with the FOL? Has trebila played with your fuel scalers? My car I've had the BMS pump and E85 BEF adjusted slightly so it can run fine. Our cars fueling situation is the issue. And your car has the same DME as any other e series n55 that's made past 03/2012. Nothing different than that. Using a F series PWG flash could work but I'm not sure if there are any other settings that need to be altered, we have the same exact turbo/hardware as the PWG models only.

I've been using the E85 BEF. I've got a new HPFP, upgraded stage 2 LPFP, new fuel filter/regulator, etc.

The issue I'm experiencing is my TRIMS are sticking at WOT sending my AFR's all over the place

[WeekendWarriorz]

Originally Posted by inevitab1e

I've been using the E85 BEF. I've got a new HPFP, upgraded stage 2 LPFP, new fuel filter/regulator, etc.

The issue I'm experiencing is my TRIMS are sticking at WOT sending my AFR's all over the place

How much boost are you trying to run? Can you post some logs? E85 bef is too aggressive for late E series cars without changing some stuff.. when Terry developed them they where made on Steve's 2011 e90 335i and a 2011 135i DCT that they had in shop, both with the n54/early N55 hpfp that flows much more. Also, is your JB4 ISO? Is the diode cut and are you on the newest firmware?

[inevitab1e]

Originally Posted by WeekendWarriorz

How much boost are you trying to run? Can you post some logs? E85 bef is too aggressive for late E series cars without changing some stuff.. when Terry developed them they where made on Steve's 2011 e90 335i and a 2011 135i DCT that they had in shop, both with the n54/early N55 hpfp that flows much more. Also, is your JB4 ISO? Is the diode cut and are you on the newest firmware?

I just received the JB4 v.2 board and it didn't change anything. I've normally run around 16-18psi on the JB4 before going to the BEF.
Log from today, E85 BEF on Map 5. Notice trims, HPFP, AFR, boost.

I've had multiple tuners looking at this issue for a month now and no one can figure it out. Lost of parts replaced that probably didn't need to be replaced. Won't allow me to attach csv log.

[WeekendWarriorz]

Originally Posted by inevitab1e

I just received the JB4 v.2 board and it didn't change anything. I've normally run around 16-18psi on the JB4 before going to the BEF.
Log from today, E85 BEF on Map 5. Notice trims, HPFP, AFR, boost.

I've had multiple tuners looking at this issue for a month now and no one can figure it out. Lost of parts replaced that probably didn't need to be replaced. Won't allow me to attach csv log.

Open up your JB4 board and see if the diode is cut/ if it's ISO, also what firmware do you have on it? Should be 5.17 or something, update that to start. What gear is the log in is this 5th gear? Also I responded to your post on n54tech, PM me a CSV on there