BMW E92 335I 17 HYRBID N54 Boost Issues: IM STUCK
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- Опубликовано: 31 май 2021
- BMW E92 335I 17 HYRBID N54 Boost Issues: IM STUCK
I forgot to mention in the video increasing duty bias in the JB4 doesn't seem to affect this issue at all. WGDC increases but boost seems to stay that 1psi below target.....
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I forgot to mention in the video increasing duty bias in the JB4 doesn't seem to affect this issue at all. WGDC increases but boost seems to stay that 1psi below target.....
Take a look at your rear inlet where it bends going onto the turbo. It's a tight bend/space. The heat weakens the silicone. If it's not in there perfect it will get over bent and reduce flow to the rear turbo and decrease boost.
Check your 3.5 bar tmap sensor, could be out of sync, I was losing boost because of my dvs, was one of the first issues I had, good luck for roll racing!
Check your PCV system. Also Smoke check the turbo's, sometimes after turbo install the metal turbo outlet pipes can sometimes leak and its very hard to see. I had this issue with the aftermarket outlets and had to switch back to stock. Wouldn't run your max boost until you sort this out.
Im having a similar issue, i believe it started when i installed the 3.5 bar sensor. Ebay quality of course.
Can’t wait for next video!
This boost issue also happens with my car, when I put my first tune that targets 24psi with 186 load it was only boosting to ~21psi and 170 actual load, but then after a week of driving it started to hit load and boost targets with a little bit of trottle closure. I decide to update my tune file to increase the load target to 187 and now it's underboosting again. This could be a tune issue or the ECU needs some time to adapt
6:15
The boost should always be controlled by the wastegates. So the best way to go would be using the aftermarket diverter valves and do some serious port work on the wastegate channels.
Just get a good charge pipe and BOV set up get ride of that diverter set up. You’ll appreciate it I promise
You should through a 6 speed manny instead. The dual clutch maybe not as good as a 8 speed? The dct to much time since I don’t have the n55 and is extremely expensive , also got the gs6x53bz but the problem I came up with is that the fly wheel changes and I need 6 hole and it’s stupid expensive . But the 6 speed sounds so cool! I wish I could of done the conversion :/
Boost pressure sensor, hose fallen off or kinked, check all the basics. Just a thought, if the amount of boost under target increases at a similar rate to the boost pressure increasing (e.g. you mentioned target of 25psi, it was hitting 23.8psi, if say at 30psi it's hitting 28.4psi) then I'd be leaning towards either the pressure sensor being out of calibration, or a boost leak somewhere. Absolute left-field problem, if you've already checked every single hose and connection, could be a tiny hole/split in the intake manifold, which would leak more with higher boost. Do you have access to a smoke machine? Get some smoke into the intake while it's under boost, see if you can see any coming out in the engine bay. I mean, you could try that with coloured water too, could be a good way to clean your pistons at the same time 🤣🤣
Did you try measure exhaust back pressure before turbo? 🤔
I always like to work from a clean slate when diagnosing issues like this on my car. So my first step would be to remove the JB4, run the stock map and log to see if the car hits target, if it does then I would load a MHD stage 1 or 2+ map on the car and log that and see if it hits target. If both of those hit target perfectly then JB4 is at fault or the settings on the JB4 are at fault so I would then reset everything on the JB4 to factory settings and start with a low boost map 1 and see if it hits boost on that map perfectly and work my way up from there.
Funny thing is I'm battling the exact same thing!! So battle of the boost leaky, target thingy not working properly N54s Saturday night it is 🤣🤣
I reckon try a different JB4 and see if its that. It's weird that you can change the target psi and and the actual boost remains consistently below. Could be a fault on the board or connections that's causing an error in the signals being sent out to the car.
Now that sucks... but I've seen 2 cars with the same issue but different reasons...a friend had this issue it turned out the wastgate wasnt sealing tight enough.. he adjusted the rod and was done... the other was my car... which turned out to be the DVS... switch to aluminum charge pipe and a tial BOV and it was fixed... mind you we don't have e85 here so we are not targetting that high boost levels... but hey boost is boost and you are leaking 🙂
audi RS6 diverter valves will fit too, if you want something slightly cheaper
Old video but ive hard boost target is not actually a target but more of a ceiling(max) boost. If boost hit it or go over it then it overboost.
And try tightening the wastegate arms a couple turns it might help with getting that target boost. It’s pretty easy