Need help with over boost

[Bmw5150]

Hi I have a 335i n55 e93. FBO jb4 I keep getting thrown to safety map 4 from maps 1,2,and 5 for over boost can someone help me figure out this issue here is a log from this morning.

[Steve @ BMS/Fuel-It!]

Lower FF to 50 and do a few proper 3rd and 4th gear pulls so it can adapt.

[Bmw5150]

Thank you for the suggestion
I set the FF to 50 and did some pulls it didn't kick me into map 4 as fast but still did and noticed it changed the FF to 80 again how many pulls will it take you think?

[Bmw5150]

Here are some logs

[Steve @ BMS/Fuel-It!]

It appears when you underboost up top it raising FF and then you underboost down low. Might need to do a little duty bias tuning to prevent this.

JB4 Duty Bias FF Tuning Info - N54Tech.com - International Turbo Racing Discussion

[Bmw5150]

Thank you for your suggestions.
I dont really know much about tuning so I'm a little intimated by map 6. But I followed the settings from the link you sent. It seemed to help but still got thrown into map4 and FF was set at 50 but went to 67 here is a log

[Bmw5150]

Here more logs with proper pulls this time had half engine light come on also

[Steve @ BMS/Fuel-It!]

The user adjustment values aren't for just map 6, they are for all maps.

You didn't do any actual DB tuning, you just set them all to 50 which is the same thing as leaving them all at zero.

Try something like this...

[Bmw5150]

Thank you very much for your help.
Oh ok I didn't realize that was for all maps nor did I know duty bias 50 was the same as 0
I did the settings you posted seemed to run a little better but still got pushed to map 4 and no error codes

[Cannon @ BMS]

Definitely need to get a 3.5 Bar TMAP. You are limited to 20.9 PSI. Looks like you are running into your boost safety (20 psi) and it's kicking you to safety (Map 4). The link below will take you to the proper TMAP for your car
https://burgertuning.com/products/jb...=2104065523736

[Steve @ BMS/Fuel-It!]

What flash are you running? That looks like a hybrid flash but you're on a stock turbo so the DME BT is very unrealistic. Consequently you are underboosting up top and WGDC is maxed out. This will cause the JB4 to increase FF and then you'll overboost down low.

Load the proper BEF and enable bit 6 under additional options for the BEF.

[Bmw5150]

I'm on the stock turbo I was under the impression that the safe limit is around 20 to 21 psi should I adjust the limit to 21?
I'm running MHD BEF 98GOB_E85.bin

[Bmw5150]

Here's another log with bit 6 and boost safely set to 21.0

[Cannon @ BMS]

This log looks much better. Make sure to update to the latest firmware as well!

[RVA_N55_Fan]

Here's another log with bit 6 and boost safely set to 21.0

What fuel are you using?

[Bmw5150]

All but the last log has been Chevron CA 91oct
Last log was Chevron CA 91 with E85 about 40%

[RVA_N55_Fan]

Have you upgraded hpfp, coils or plugs?

[Bmw5150]

Here is a log after updating firmware from 17 to 18
Boosting is lower for some reason
I haven't upgraded hpfp but I did buy new oem coils and ngk 2 step colder plugs

[RVA_N55_Fan]

Here is a log after updating firmware from 17 to 18
Boosting is lower for some reason
I haven't upgraded hpfp but I did buy new oem coils and ngk 2 step colder plugs

Which OEM? Eldor? Did you regap the ngk plugs? (Just asking to help folks know all the impactful details).

[Bmw5150]

NGK SILZKBR8D8S (2 Step colder) Plugs
Gap .022
Eldor coils

[Steve @ BMS/Fuel-It!]

FF is too low, set FF to 80 and do another log.

[Bmw5150]

Ok I set FF to 80 but it went to 106 after this pull and to map 4 here is the log

[Steve @ BMS/Fuel-It!]

Going to have to be very aggressive with the duty biases to resolve this. You are still underboosting too much up top so FF keeps rising and then creates overboost down low.

Try this...

[Bmw5150]

I changed the settings to what you suggested and didn't get thrown into map4 from 5 but did from map 2 and 6

[Steve @ BMS/Fuel-It!]

Put your FF back to 80 and disable FF learning. You're continuing to underboost up top and its driving FF up.

[Bmw5150]

Setting changed didn't get thrown into map 4 from maps 1,2,5, or 6 but still seems like I'm under boosting

[RVA_N55_Fan]

Setting changed didn't get thrown into map 4 from maps 1,2,5, or 6 but still seems like I'm under boosting

Are map 6 WOT pulls throwing any codes?

[Bmw5150]

Only did a few pulls on map 6 but no codes

[Steve @ BMS/Fuel-It!]

Man this car is a PITA.

You're underboosting up top but your DB's are about maxed out up top so let s try this.

[Bmw5150]

Well I'm glad you think it is too I thought it was just me this is my first time tuning so I was thinking I had a lot to learn think I still do but couldn't figure it out for the life of me here is the new log feels like stock performance

[Steve @ BMS/Fuel-It!]

I think there is likely something else going on here that may be hardware related but at least the WGDC and FF curves match now. Bump your FF up to 120.

[Bmw5150]

Hopefully my issue is not too bad here is a log with FF @ 120 not proper log but all I could due til tonight

[Bmw5150]

Here is proper log

[Steve @ BMS/Fuel-It!]

Okay, the stock turbo isn't going to hit target up top but that's fine because your fuel won't support that much boost as you are getting quite a few timing corrections.

Can you add a couple gallons of E85 or some octane booster? We're getting pretty close but on this fuel, you'd have to drop you boost target a couple #'s.

[Bmw5150]

Ok here is a log with e85

[Steve @ BMS/Fuel-It!]

That looks better and turbo is pretty much maxed out, stick with map 5.

[Bmw5150]

Ok great thank you very much for all of your help very much appreciated

[Bmw5150]

Do you think I should flash mhd E 85 map

[Cannon @ BMS]

Are you currently on "Pump" or "Race" flash?

[Bmw5150]

I'm on MHD BEF pump. I don't see a race flash. I have mhd super license but don't know where to find a race flash.

[Cannon @ BMS]

The MHD BMS BEF's for N55 can all be found here. Look through what each BEF is designed for, and select the most suitable BEF for your car.

[Bmw5150]

I found the bef files not sure what the difference is from the 98GOB PUMP. THE 98GOBSTOCK AND THE 98GOB PUMP USA FILES. I still fill like my car is under boosting. Here is a log

[RVA_N55_Fan]

I'm on MHD BEF pump. I don't see a race flash. I have mhd super license but don't know where to find a race flash.

I don't know the mhd maps but he may have been referring to their BMS bef flash options they offer for free. Just a thought.

[Bmw5150]

Oh ok I didn't realize they also had bef maps where are they at ?

[RVA_N55_Fan]

Oh ok I didn't realize they also had bef maps where are they at ?

E Chassis N55 MHD Back End Flash Maps - N54Tech.com - International Turbo Racing Discussion

[Bmw5150]

Car hasn't given be too much trouble since. But feels like its underboosting. Today I got a half engine light with codes
38A4
38B4
2906
Does anyone have any suggestions?
Thank you in advance

[Cannon @ BMS]

Upload a log please. Thanks!

[Bmw5150]

I dont have a log with the engine light nor is this a proper log but its all I can do f0r now. Dont have time the Mexico drive

[Bmw5150]

Here is another log I took right after the code popped up and I cleared it but didn't happen during the log

[Bmw5150]

Here is a log when the have engine light comes on but this time it cleared itself
Does anyone have any suggestions?