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ferocity02 ferocity02 is offline
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Default 02-13-2015, 02:00 PM

I had my turbos replaced and they rattled even more than those with 81k miles on them. My solution was to remove the JB4 and install Cobb/Wedge flash. No rattle whatsoever now.
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suprchrgd suprchrgd is offline
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Default 02-13-2015, 02:04 PM

Quote:
Originally Posted by ferocity02
I had my turbos replaced and they rattled even more than those with 81k miles on them. My solution was to remove the JB4 and install Cobb/Wedge flash. No rattle whatsoever now.
my turbos were replaced at 70k, im now at 98k and no rattle with the jb4. jb4 has been on for 25k mile now, which is pretty much the entire life of the new turbos.


JB4G5 ISO/BMS E85 Flash, vrsf dp's, vrsf 7" fmic, vrsf cp with tial, 255 walbro inline,e60,alpina trans flash
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ferocity02 ferocity02 is offline
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Default 02-13-2015, 02:16 PM

Quote:
Originally Posted by suprchrgd
my turbos were replaced at 70k, im now at 98k and no rattle with the jb4. jb4 has been on for 25k mile now, which is pretty much the entire life of the new turbos.
"Results may vary" I suppose. I noticed with the JB4 uninstalled the turbos never rattled. Something about how the JB4 was controlling the wastegates caused the rattling, even when on Map 0. I spent probably hours in total adjusting menus 10 and 12 and could never get rid of it. Removed the JB4 and it's totally gone. Strange.
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black535xi black535xi is offline
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Default 02-13-2015, 02:52 PM

Quote:
Originally Posted by ferocity02
"Results may vary" I suppose. I noticed with the JB4 uninstalled the turbos never rattled. Something about how the JB4 was controlling the wastegates caused the rattling, even when on Map 0. I spent probably hours in total adjusting menus 10 and 12 and could never get rid of it. Removed the JB4 and it's totally gone. Strange.
Has to be a coincidence. Jb4 has no control in map 0, which is why you switch to map 0 for flashing, dealer visits etc. I could see it in map 4, but not 0


2010 535xi
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ajsalida ajsalida is offline
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Default 02-13-2015, 02:57 PM

Quote:
Originally Posted by ferocity02
I had my turbos replaced and they rattled even more than those with 81k miles on them. My solution was to remove the JB4 and install Cobb/Wedge flash. No rattle whatsoever now.
I had no rattle at all running Cobb Stage 2+ for couple of years. Switched to JB4 + meth (no backend flash) and immediately got WG rattle. Went through the stated procedure for menu 10 and 12 etc. Fixed the rattle but then got excessive lag at low rpm's and various other minor headaches. Long story short, I reset ECU adaptations and set all JB4 parameters back to default, also loaded newest firmware (28.5) no more issues no rattle.

I think given the various functions being shared/split with ECU & JB4, it may be stuff the ECU has previously adapted to is not playing well with initial JB4 settings, and going back to square one may be a good idea. Worth trying at least.

Getting ready to run backend flash here soon, interested to see how the WG's behave.
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ferocity02 ferocity02 is offline
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Default 02-13-2015, 03:03 PM

Quote:
Originally Posted by black535xi
Has to be a coincidence. Jb4 has no control in map 0, which is why you switch to map 0 for flashing, dealer visits etc. I could see it in map 4, but not 0
According to Post 13 above, the JB4 still affects the wastegates on Map 0, although with stock boost targets.
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black535xi black535xi is offline
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Default 02-13-2015, 04:26 PM

Quote:
Originally Posted by ferocity02
According to Post 13 above, the JB4 still affects the wastegates on Map 0, although with stock boost targets.
I would love to hear terry or russell's input on that... i always understood that map 4 was exactly what post 13 describes, jb4 controls boost but at stock targets, and map 0 completely disables jb4


2010 535xi
ALL black, murdered out FBO jb4+flash
Fuel It! stage 2 LPFP on the way

12.400@112.16/1.731 60'
4205lbs
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black535xi black535xi is offline
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Default 02-13-2015, 04:31 PM

Check out 0-4 (map 4) and 0-0 (map 0)
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2010 535xi
ALL black, murdered out FBO jb4+flash
Fuel It! stage 2 LPFP on the way

12.400@112.16/1.731 60'
4205lbs
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(#34)
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ferocity02 ferocity02 is offline
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Default 02-13-2015, 04:53 PM

Quote:
Originally Posted by black535xi
Check out 0-4 (map 4) and 0-0 (map 0)
"entirely" might be used loosely there. Anyways, on two separate occasions I removed the JB4 and the rattle disappeared, then reinstalled and rattle came back, even on Map 0. So I don't think that is coincidence. I'm not complaining, just telling my experiences. Rattle seems to vary from car to car. I'm currently running Cobb/Wedge and am very happy, and no rattle.
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knissel knissel is offline
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Default 02-23-2015, 08:57 AM

I would also like to hear input from Terry on this subject.

Thank you,
Kenny


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(#36)
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Russell @ BMS Russell @ BMS is offline
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Default 02-23-2015, 11:37 AM

If running ISO software JB4 is totally in control of WG even in map 0.


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Fuman Fuman is offline
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Default 02-24-2015, 08:24 PM

Quote:
Originally Posted by ajsalida
I had no rattle at all running Cobb Stage 2+ for couple of years. Switched to JB4 + meth (no backend flash) and immediately got WG rattle. Went through the stated procedure for menu 10 and 12 etc. Fixed the rattle but then got excessive lag at low rpm's and various other minor headaches. Long story short, I reset ECU adaptations and set all JB4 parameters back to default, also loaded newest firmware (28.5) no more issues no rattle.

I think given the various functions being shared/split with ECU & JB4, it may be stuff the ECU has previously adapted to is not playing well with initial JB4 settings, and going back to square one may be a good idea. Worth trying at least.

Getting ready to run backend flash here soon, interested to see how the WG's behave.
I'm running latest ISO firmware with backend flash. Menu 10 at 4.6 and 12 at 3.8. Rattles at around 2800 rpm. Best setting thus far but I'm still very frustrated.

Menu 12 seems to be the only one that helps with cold rattle and rattle while driving. No rattle if I'm flooring the car. But ain't how I normally drive.

I did have a hunch that it might be software related as I recalled only getting this rattle after some point of software upgrade. But really I still don't know the causes.

Car drives extremely well with meth and e85 mix, except for the squeal from the hawk pads that I can't seem to get rid off. But the rattle has been doing my head in.

I've been refraining from doing this reset due to having to go through learning on the roads here. But will give it a go.


E92 N54 6AT, JB4 G5 ISO, FBO, METH, E85 FLASH, PI, S2 LPFP
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ratapeludismo ratapeludismo is offline
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Default 02-28-2015, 03:21 PM

Quote:
Originally Posted by Spxxx
10 = DWP = default wastegate position
- this is where the WG sits at 0% open throttle
- settings range from 0-100% (0-5 on tach)
- 0 = wide open , 5= almost closed? I think
- 0 = wastegate further from closing and less chance of rattling but longer time to close and more lag.
- 5 = WG almost closed = better throttle response = more likely to rattle (but all cars vary)
Hello;
In my case it is the opposite;
More low (0), more rattle the wastesgate.
Louder (100) no rattle.

Why does my car works well?

A greeting and thanks.
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alaa1435 alaa1435 is offline
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Default 03-20-2015, 06:24 AM

Hi guys i have bmw 335i n54 with jb4 iso 5,bms dci,hks bov,vrsf 7 inch intercooler and vrsf v2 *********.
car has 192k kilos on it the rattle is so annoying so i took it to a mechanic he adjusted the actuator and put a c clip after i drove the car waw its like a beast now no more rattle and boost increased 20 minutes later something went wrong car is boosting 1psi or 2 it says turbo charge pressure too low. Checked all vaccume lines no problem with them he changed them but still no boost anyone knows wat might happen?
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Fuman Fuman is offline
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Default 03-20-2015, 06:45 AM

Quote:
Originally Posted by suspenceful
I have wastegate rattle pretty bad.

Default settings are:
Menu 10 - 4K RPMs
Menu 12 - 2.8K RPMs

I can get rid of my rattle by changing menu 10 to 1K RPMs.

I no longer care about it. I'd rather have performance. Does anyone know if running menu 10 maxed out at 5K or 100 is bad?
I've been running menu 12 at 4 for a long time. It's the lowest rattle I get but when going from cold to hot there's what I believe its called oscillation.

I run menu 10 at 4.4 or 88 - it's just what I like.

Unfortunately I've not heard any replacement applicable in Australia. I must admit I've frustrated for years. It's also right hand drive so not easy to adjust myself. I'll be getting the garage to calibrate the waste gates next week. I can't take it anymore.


E92 N54 6AT, JB4 G5 ISO, FBO, METH, E85 FLASH, PI, S2 LPFP
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Osiris Osiris is offline
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Default 12-21-2019, 09:44 AM

So it seems I am not going mad.

I fitted my JB4 at the beginning of this year 4 months after brand new turbos from bmw, instant waste gate rattle the night I fitted the JB4 to my car. Couple months later I fitted hybrid turbos to my car with a waste gate repair kit to make sure no rattle could be heard and no difference, Waste gates rattled with the JB4. I have been living with this for months.

Last week I decided to remove the JB4 in its entirety to see if my turbos still rattled and the rattle in its entirety was completely gone, for the first time my car sounded amazingly crisp and smooth. I put the JB4 back in last night and went for a test drive and the rattle is back.

Explain please why JB4 is causing rattle as this seems to be a widespread problem and many people have said that they have done exactly what I have done with the same results. Two brand new sets of turbos that rattle cannot be anything but the JB4.

Furthermore I did try run MHD as well and also no rattle. So its 100% definitely the JB4. I have tried the JB4 with and without back end flash.
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