[Ryanfknt]

2014 f30 335i xdrive (n55 ewg)

My wgdc goes down the higher my rpm. Wgdc is as low as 71% at 6.3k rpms.
At 6.3k rpm, my boost is as low as 10 psi, with the target being 17.3 psi.
I don’t believe I have a boost leak because it reaches and maintains target boost until roughly 5k rpms. And if I did have a boost leak, i believe the wgdc would be increasing in attempt to reach the boost target.

If there is any error with my thoughts, I would like for someone with more knowledge to chime in. Any opinion on this relation between wgdc and reaching boost target would be greatly appreciated.

(I understand this log has a bit of knock, I have since tuned down to 91 and is showing perfect timing now, with the same issues of not holding boost target)

https://www.bootmod3.net/log?id=6000...0b431ee282cd85

[thejeremyman9]

You need to do a 4th gear pull not a 3-4. There's probably not enough load in 3rd to maintain the boost target and i can see its getting much closer in 4th.

I recommend reading my thread then recollecting ~2-3 4th gear pulls from 2000/2500-6500 on your current map and reporting back.

https://f30.bimmerpost.com/forums/sh....php?t=1732327

[Ryanfknt]

I am driving a 6mt. 6mt is datalogged 3rd to 4th gear. 8at (automatic) would datalog just 4th gear.
In my log, I am unable to go above 5.8k rpm in 4th gear because at that point I was going 120 mph.
What you said “it’s closer to hitting target in 4th” is not true. In 4th gear, 5.8k rpms I was at 13.3psi. The log shows 3rd gear at 5.8k rpms was also 13.3psi.

Thank you for the input, I will read your link now!

[Ryanfknt]

Altitude - 1,000’
120k miles on the car
Brand new NGK 97506 plugs gapped .022
Intercooler, high flow catted down pipe..

My concentration now is why isnt my wgdc climbing upwards in attempt to reach boost target? Is there wear items that need replacing? I know the pwg has a boost solenoid that is #1 reason for loss of boost similar to my problem. If I had a pwg, that would be the first item I would cross off the list. But ewg doesn’t have a boost solenoid.

What does ewg have that would cause my wgdc to remain low when I’m not reaching target boost?
Could it be the wastegate needs to be replaced? Could the turbo be tired? I don’t know.

[thejeremyman9]

Originally Posted by Ryanfknt

I am driving a 6mt. 6mt is datalogged 3rd to 4th gear. 8at (automatic) would datalog just 4th gear.
In my log, I am unable to go above 5.8k rpm in 4th gear because at that point I was going 120 mph.
What you said “it’s closer to hitting target in 4th” is not true. In 4th gear, 5.8k rpms I was at 13.3psi. The log shows 3rd gear at 5.8k rpms was also 13.3psi.

Thank you for the input, I will read your link now!

Youre right, i didnt look at the log close enough earlier to see you stopped at a earlier RPM in 4th.

Originally Posted by Ryanfknt

Altitude - 1,000’
120k miles on the car
Brand new NGK 97506 plugs gapped .022
Intercooler, high flow catted down pipe..

My concentration now is why isnt my wgdc climbing upwards in attempt to reach boost target? Is there wear items that need replacing? I know the pwg has a boost solenoid that is #1 reason for loss of boost similar to my problem. If I had a pwg, that would be the first item I would cross off the list. But ewg doesn’t have a boost solenoid.

What does ewg have that would cause my wgdc to remain low when I’m not reaching target boost?
Could it be the wastegate needs to be replaced? Could the turbo be tired? I don’t know.

Its relatively small, but your ambient pressure is -0.6 psi. From what ive seen its not really 1:1 so that can contribute to about 1-1.2 psi lose compared to most people with SL or better DA.

WGDC doesnt always do that, it depends on the map. For example when i had a massive boost leak my WGDC didnt spike to compensate, i just didnt reach boost target. There's limits on how far it will go. It's not a purely reactive parameter, there are default tables it goes off of as well AFAIK.

It could in theory be a hardware issue but i would read too much into it at this point. I would collect a couple logs from the 91 map and post those up and well take a look. Also scan for codes to be safe. Resetting adaptations could be worth a shot to see if it makes any difference.

[Ryanfknt]

Originally Posted by thejeremyman9

Youre right, i didnt look at the log close enough earlier to see you stopped at a earlier RPM in 4th.



Its relatively small, but your ambient pressure is -0.6 psi. From what ive seen its not really 1:1 so that can contribute to about 1-1.2 psi lose compared to most people with SL or better DA.

WGDC doesnt always do that, it depends on the map. For example when i had a massive boost leak my WGDC didnt spike to compensate, i just didnt reach boost target. There's limits on how far it will go. It's not a purely reactive parameter, there are default tables it goes off of as well AFAIK.

It could in theory be a hardware issue but i would read too much into it at this point. I would collect a couple logs from the 91 map and post those up and well take a look. Also scan for codes to be safe. Resetting adaptations could be worth a shot to see if it makes any difference.

I did some more logs today on the 91 tune. I reached higher rpms in this log to show the extent of the problem. At 6,726rpm, I am down to 9psi boost. I understand the stock turbo has a hard time keeping up at high rpms, but it shouldn’t be letting me down by that much right??

https://www.bootmod3.net/log?id=609e...729b039708b8c0

Maybe it is tune related. I will do some logs on the stock tune now and see what it can put down for boost.

[ctt300]

Looks like its the tune dropping load in the higher RPM's. Is this a BM3 Stg 2 91 Oct tune or another?

Try another tune and see if it exhibits the same behavior.

[Ryanfknt]

The log i just posted was bm3 stage 2 91.

I just flashed back to stock and took a log (posted below)
The stock log holds all boost targets easily because the boost targets are so low. The targets here are lower than what my stage 2 tune dropped down to.

https://www.bootmod3.net/log?id=609e97dbc090c6308eb1adf8

[thejeremyman9]

Originally Posted by Ryanfknt

I did some more logs today on the 91 tune. I reached higher rpms in this log to show the extent of the problem. At 6,726rpm, I am down to 9psi boost. I understand the stock turbo has a hard time keeping up at high rpms, but it shouldn’t be letting me down by that much right??

https://www.bootmod3.net/log?id=609e...729b039708b8c0

Maybe it is tune related. I will do some logs on the stock tune now and see what it can put down for boost.

What version of the tune are you running? It doesnt seem to show in the log... 6.4? 7.1?

Your boost does seem to drop more than other EWGs, but need to know what version of the tune for an apples to apples comparison. Your IATs are also quite high but that's a separate issue.

Try stage 1 tune also and let us know what version(s) you are flashing

[Ryanfknt]

Version 7.1.. just reflashed stage 2 91 and this is what I got.
https://www.bootmod3.net/log?id=609e...729b039708b9db

Then I wanted to try the new multimap tunes that bm3 just released. So here I flash into stage 2 multimap, set it to 91, and the logs look SIGNICANTLY better!!
https://www.bootmod3.net/log?id=609e...90c6311b3d1eb2

Is the generic 7.1 stage 2 maps just total garbage? The new map that they just dropped (multimap stage 2) set to 91 octane seems to have fixed my problem.

The timing on the stage 2 multimap 91 also seems much more conservative.. any correlation??
What do you guys think??

[thejeremyman9]

Originally Posted by Ryanfknt

Version 7.1.. just reflashed stage 2 91 and this is what I got.
https://www.bootmod3.net/log?id=609e...729b039708b9db

Then I wanted to try the new multimap tunes that bm3 just released. So here I flash into stage 2 multimap, set it to 91, and the logs look SIGNICANTLY better!!
https://www.bootmod3.net/log?id=609e...90c6311b3d1eb2

Is the generic 7.1 stage 2 maps just total garbage? The new map that they just dropped (multimap stage 2) set to 91 octane seems to have fixed my problem.

The timing on the stage 2 multimap 91 also seems much more conservative.. any correlation??
What do you guys think??

You're the only person ive seen with this boost issue on the stage 2 91 v7.1 map. Not sure why. But yes i agree the multimap log looks much better in terms of boost control, so not sure what they changed there.

Timing and boost are inversely related. You run more boost with less timing and vice versa. 11.5 degrees of timing in your "old" logs is actually very high for a 91 map, but i suspect thats just because your boost was only like 10 psi in the upper RPM. You typically only see that much timing in ethanol or race gas maps when you are running high boost.

Your IATs are insanely high in your "new" log, especially in 4th gear, so i am not surprised at all you can't hold timing. I wouldn't even drive in boost with IATs at 150F!! Your IC is undersized for what you are doing because you get 40F IAT rise in 2 gears.

[Ryanfknt]

Originally Posted by thejeremyman9

You're the only person ive seen with this boost issue on the stage 2 91 v7.1 map. Not sure why. But yes i agree the multimap log looks much better in terms of boost control, so not sure what they changed there.

Timing and boost are inversely related. You run more boost with less timing and vice versa. 11.5 degrees of timing in your "old" logs is actually very high for a 91 map, but i suspect thats just because your boost was only like 10 psi in the upper RPM. You typically only see that much timing in ethanol or race gas maps when you are running high boost.

Your IATs are insanely high in your "new" log, especially in 4th gear, so i am not surprised at all you can't hold timing. I wouldn't even drive in boost with IATs at 150F!! Your IC is undersized for what you are doing because you get 40F IAT rise in 2 gears.

Apparently I did size too small on the intercooler.. I only spent like $350 on it.. I wouldn’t have known to look at the IAT’s if it wasn’t for you. So thank you for that! You think I definitely need to buy a new one??

here is 2 more logs I decided to try the multimap stage 2 93 this time. These logs look cleaner than any of the other ones.. holding better boost than the multimap stage 2 91, and holding incredible boost compared to the version 7.1 stage 2 91 bm3 tune.

I think the timing looks pretty conservative on these 93 logs too right? I should be able to run these safely?

https://www.bootmod3.net/log?id=609f...0b430f3683dd8c

https://www.bootmod3.net/log?id=609f...729b0a04db21f6

[thejeremyman9]

Originally Posted by Ryanfknt

Apparently I did size too small on the intercooler.. I only spent like $350 on it.. I wouldn’t have known to look at the IAT’s if it wasn’t for you. So thank you for that! You think I definitely need to buy a new one??

here is 2 more logs I decided to try the multimap stage 2 93 this time. These logs look cleaner than any of the other ones.. holding better boost than the multimap stage 2 91, and holding incredible boost compared to the version 7.1 stage 2 91 bm3 tune.

I think the timing looks pretty conservative on these 93 logs too right? I should be able to run these safely?

https://www.bootmod3.net/log?id=609f...0b430f3683dd8c

https://www.bootmod3.net/log?id=609f...729b0a04db21f6

Took a quick look through and yeah the logs look OK (except for crazy high IATs), and timing targets do look pretty conservative unless you are just getting equal corrections across all cylinders (BM3 logs dont show like MHD do).

As to the IC, well VRSF 5'' is basically that same price lol. But in any case yeah, your IC isnt up to the task for 15+ psi. I dunno what ambient temps were but 150F is way too high for IATs. If you are going to get a new one i would go big, like a 6'' rather than the typical 5'' stepped.

[Ryanfknt]

Originally Posted by thejeremyman9

Took a quick look through and yeah the logs look OK (except for crazy high IATs), and timing targets do look pretty conservative unless you are just getting equal corrections across all cylinders (BM3 logs dont show like MHD do).

As to the IC, well VRSF 5'' is basically that same price lol. But in any case yeah, your IC isnt up to the task for 15+ psi. I dunno what ambient temps were but 150F is way too high for IATs. If you are going to get a new one i would go big, like a 6'' rather than the typical 5'' stepped.

Thanks dude you’ve been super helpful, you should put your Venmo tag in your bio 😉

I am currently running the BMS Burger Tuning 5" Stepped HD Intercooler.. so to those interested, apparently we just proved that it is junk... oh well that’s what I get for cheaping out 😌

I just found the VRSF 6.5" Stepped Competition HD Intercooler for only $420 at
https://topgearsolutions.com/vrsf-6-...-435i-n20-n55/

I will be buying that vrsf intercooler now for sure considering I will likely upgrade the turbo in the near future.. I currently have the dorch stage 1 hpfp sitting in the garage with 55 gallon drums waiting to be filled with e85... stage 2+ e30 here I come 😁😁😁

[AsianBill]

Yeah the bms intercooler isn't great. I am actually replacing mine with the same vrsf 6.5" so this should solve those IAT issues.

[thejeremyman9]

Agree with both posts above going for the VRSF 6.5''. I got the 5'' HD a few years ago when i didnt know any better and its adequate for my application but barely and i wish i paid $40 more for the 6.5''. Oh well.

[n55david]

Originally Posted by thejeremyman9

Agree with both posts above going for the VRSF 6.5''. I got the 5'' HD a few years ago when i didnt know any better and its adequate for my application but barely and i wish i paid $40 more for the 6.5''. Oh well.

same, I didn't even know about the 6.5" at the time.