[jpy97ggg]

Hey guys, I have a 2011 BMW 335i E90 6 speed. I am full bolt on and MHD stage 2+ tuned. I live in California so I get 91 octane gas. I run ACN91 on my tune. I would like for someone to explain what is going wrong with my car. I am new to data logs and any feedback would help, THANK YOU.

What I noticed from my logs are:
- my timing corrections are bad
- over boosting and not close to hitting target boost

I'm sure there are more things wrong but I am still learning how to read these logs. If anyone could give me a solution or pointers on my logs that would be much appreciated.

I just received my GFB diverter valve that I will install soon and data log again.

Modifications:
- BMS intake
- VRSF 5" HD intercooler
- VRSF catless downpipe
- VRSF chargepipe
- VRSF street exhaust
- NGK 97506 1 step colder plugs gapped .22
- Delphi GN10571 ignition coils

1st log:
https://datazap.me/u/jpy97ggg/test-1?log=0&data=3-13

2nd log:
https://datazap.me/u/jpy97ggg/test-2?log=0&data=3-11

3rd log (changed spark plugs):
https://datazap.me/u/jpy97ggg/test-3...og=0&data=3-11

[TheGoodTheBadTheUgly]

Originally Posted by jpy97ggg

Hey guys, I have a 2011 BMW 335i E90 6 speed. I am full bolt on and MHD stage 2+ tuned. I live in California so I get 91 octane gas. I run ACN91 on my tune. I would like for someone to explain what is going wrong with my car. I am new to data logs and any feedback would help, THANK YOU.

What I noticed from my logs are:
- my timing corrections are bad
- over boosting and not close to hitting target boost

I'm sure there are more things wrong but I am still learning how to read these logs. If anyone could give me a solution or pointers on my logs that would be much appreciated.

I just received my GFB diverter valve that I will install soon and data log again.

Modifications:
- BMS intake
- VRSF 5" HD intercooler
- VRSF catless downpipe
- VRSF chargepipe
- VRSF street exhaust
- NGK 97506 1 step colder plugs gapped .22
- Delphi GN10571 ignition coils

1st log:
https://datazap.me/u/jpy97ggg/test-1?log=0&data=3-13

2nd log:
https://datazap.me/u/jpy97ggg/test-2?log=0&data=3-11

3rd log (changed spark plugs):
https://datazap.me/u/jpy97ggg/test-3...og=0&data=3-11

Corrections over many cylinders. When was the last time you changed plugs and coils? Don't exactly know how the fuel is in your area, but if you have higher octane I would suggest trying that.

Another thing I am noticing is that in two of your logs you are hitting 22.3 psi of boost. In reality, I am pretty sure you are hitting more than that, but since the 2.5 Bar sensor caps around 21.3-23 psi it seems like you reached the max, especially since the tendency if the boost doesn't form a peak but a plateau. I suggest you look into investing in a N20 3.5 Bar TMAP sensor as well as the adapter if needed.

[jpy97ggg]

Originally Posted by TheGoodTheBadTheUgly

Corrections over many cylinders. When was the last time you changed plugs and coils? Don't exactly know how the fuel is in your area, but if you have higher octane I would suggest trying that.

Another thing I am noticing is that in two of your logs you are hitting 22.3 psi of boost. In reality, I am pretty sure you are hitting more than that, but since the 2.5 Bar sensor caps around 21.3-23 psi it seems like you reached the max, especially since the tendency if the boost doesn't form a peak but a plateau. I suggest you look into investing in a N20 3.5 Bar TMAP sensor as well as the adapter if needed.

Sweet. Thanks for taking a look, I actually just replaced my plugs yesterday and did a log today. So log 3 was with new plugs. Haven't changed my ignition coils because I figured they were fine but not sure if my coils need to be changed. Had them for like 9k miles but I have a stock turbo and stage 2+ shouldn't require a N20 tmap sensor. I don't think I'm suppose to hit 22psi or more, but could be wrong. Also 91 octane is the highest I got without driving over 100+ miles for gas lol

[jpy97ggg]

Originally Posted by TheGoodTheBadTheUgly

Corrections over many cylinders. When was the last time you changed plugs and coils? Don't exactly know how the fuel is in your area, but if you have higher octane I would suggest trying that.

Another thing I am noticing is that in two of your logs you are hitting 22.3 psi of boost. In reality, I am pretty sure you are hitting more than that, but since the 2.5 Bar sensor caps around 21.3-23 psi it seems like you reached the max, especially since the tendency if the boost doesn't form a peak but a plateau. I suggest you look into investing in a N20 3.5 Bar TMAP sensor as well as the adapter if needed.

What would I do to fix those timing corrections in my cylinders ?

[TheGoodTheBadTheUgly]

Originally Posted by jpy97ggg

What would I do to fix those timing corrections in my cylinders ?

I think the best thing to try would be to put the highest octane fuel in your area if there is one. That way we will be able to pinpoint if the fueling is causing issues.

Concerning the overboost, you are right when you say you shouldn't do more than 22 psi, since the target is much lower around 18 psi, but if you look at the shape of the curve which flattens up at the peak and the fact hat it is pegged at 22.3 psi, it is quite evident that you are boosting above that level and that the range of your current 2.5 Bar sensor is capped.

[Tunafish]

Pulling back to stage 2 from stage 2 plus will help the timing.. Sometimes you just dont have the octane.. The timing is not horrible how it is now, the n55 sees more knock than other but staying under -3 correction is a safe target.. You could look into meth or ethanol if you want to clean up the timing..

There is discussion about over boost, i am in the side saying its due to throttle closure and is not actually the psi going into the cylinders. I am also thinking this is an crap tune passed on to us by MHD.. They worked hard on the n54 tune but the n55 PWG they threw out wanting to move onto the n55 EWG. Thats why you dont hear anything from MHD on e9x forums..
So i am thinking that the solution is to get a custom tune but there doesnt seem to be much knowledge on the n55 PWG (myself included) that i have read..

You also have to think what these overboost are doing to the long term health of our turbo.. Most of the N55 PWG have these major throttle closure and overboost, the few that i have seen that doesnt was leaking boost. I will stay tune to how that GFB diverter valve works out, very interested in those results.

[whyzee125]

I would try mixing in some ethanol. On my old n55 I would do that as I didn't have a way to log just to ensure I had adequate octane. With the crappy 91 California gas, I'd bet that's where your issue lies. I would try about 2.5 gallons to start and see how your logs look from there.

[jpy97ggg]

Originally Posted by Tunafish

Pulling back to stage 2 from stage 2 plus will help the timing.. Sometimes you just dont have the octane.. The timing is not horrible how it is now, the n55 sees more knock than other but staying under -3 correction is a safe target.. You could look into meth or ethanol if you want to clean up the timing..

There is discussion about over boost, i am in the side saying its due to throttle closure and is not actually the psi going into the cylinders. I am also thinking this is an crap tune passed on to us by MHD.. They worked hard on the n54 tune but the n55 PWG they threw out wanting to move onto the n55 EWG. Thats why you dont hear anything from MHD on e9x forums..
So i am thinking that the solution is to get a custom tune but there doesnt seem to be much knowledge on the n55 PWG (myself included) that i have read..

You also have to think what these overboost are doing to the long term health of our turbo.. Most of the N55 PWG have these major throttle closure and overboost, the few that i have seen that doesnt was leaking boost. I will stay tune to how that GFB diverter valve works out, very interested in those results.

Awesome man. Thanks for the feedback, I didn't know the n55 MHD tunes weren't worked on as much. But I'm already thinking about a custom wedge tune. Also I am aware of the overboosting long term problems. I'm gonna try and tune to stage 2 and log and do a stage 2+ then log ! I'll install the GFB diverter valve this weekend

[jpy97ggg]

Originally Posted by whyzee125

I would try mixing in some ethanol. On my old n55 I would do that as I didn't have a way to log just to ensure I had adequate octane. With the crappy 91 California gas, I'd bet that's where your issue lies. I would try about 2.5 gallons to start and see how your logs look from there.

I'm not sure where to even get my hands on ethanol. Sucks that our gas is crap lol but I can't really do much about fuel here. So I'm looking for a solution besides fuel/octane that would help solve or get better results from my log.

[Tunafish]

Looking forward to the after log on the new diverter valve.....

[jpy97ggg]

Originally Posted by Tunafish

Looking forward to the after log on the new diverter valve.....

Yea just have to install it. Wont be able to do till Monday

[jpy97ggg]

Installing GFB diverter valve sometime today. Will be putting up new logs. Hopefully this solved my issue

[jpy97ggg]

Installed GFB diverter valve. Will get logs down tomorrow

[1slow320i]

Originally Posted by jpy97ggg

Installed GFB diverter valve. Will get logs down tomorrow

Has the GFB diverter valve changed anything on the logs?