09-30-2020, 08:43 PM | #179 |
Second Lieutenant
107
Rep 284
Posts |
i dunno - that's a question for BMS or someone more knowledgeable than i am on here. all i know is that i'm satisfied with the product.
__________________
Alpine White BMW X2 M35i
|
Appreciate
1
xcelir8bmw405.50 |
10-01-2020, 10:51 AM | #180 |
Major
303
Rep 1,087
Posts |
Wowsers.. so I have some interesting news.
Okay I was trying to take my logs of partial-full throttle with the map2 and custom map6 and did some experimenting. First of all, on a nice steady acceleration onto the highway without punching it, I managed to hit boost limit on map2 and have it bounce into failsafe mode.. yes this is when the boost hits too high, somewhere around 30 from what I gather. The new trick is.. if you unplug that CANBUS OBDII sensor you can run it all the way up with no failsafe! I am looking at my logs right now on the first run and at 75% throttle I managed to get it to spike to 33.1 psi! Fuel trims and AFR remain maxed and at 15. Now I'm assuming that the new car has a sensitive enough O2 sensor (like wideband) that the reading of 15 is true and it still has plenty of FUEL to go. So.... the only concern is: Can the plastic intercooler pipes handle 33 psi? Certainly other older N54/N55 cars don't like that much boost and start popping off pipes/cracking it. This car is obviously designed to start off at let's round it up to 23psi. On the older builds, they weren't meant to go up to 23psi. So.. I'm sure it's over engineered to take more boost.. but at what limit does it stop?? I'm not out for glory drags or HP numbers, just daily driving my car. But I obviously don't ever want it to pop off on the highway where that's the only place I could presumably hit a consistant 33psi. I've sent my logs and my thoughts out to Terry@BMS and maybe we can get some happy middle ground. So far, BMS is way out front though in terms of plugging it in and getting the high boost. I would entertain going back to map1 to see if it stops at 30 or 31psi but in terms of driveability, map2 is definitely much better. For me, I'm back to my custom Map6 because I do not want my boost to spike past 27.5psi. If I wanted a little more gusto I know how to adjust it to get a little higher, but I'm content. I think what would be nice to compare xcelir8bmw is if the JB4 itself in either form of a custom map or map2 is better/worse than the TDI box you have... but the proof is in the pudding that JB4 can put out a ton of boost, which I am still thinking the TDI isn't hitting that much. Driveability is also a big thing though, which you say the TDI feels pretty good compared to stock. *The JB4 drives fine and smooth, but that map2 makes it drive much much better.* |
Appreciate
0
|
10-01-2020, 02:44 PM | #181 | |
Major
406
Rep 1,104
Posts |
Quote:
With that being said, the JB4 sounds a little 'iffy' to me right now. I did receive it via FedEx - but unopened the package. In my last long phone conversation with TDI yesterday, it was made very clear that the MAP on my car, right now, can only get more aggressive with ease. This would be on mode 7. Remember guys, I have modes 1-7, least to most aggressive. So I am tuning to mode 7, most aggressive with hopes (sure I'll get there unless I already am) at 3-4 PSI consistent over stock. And we'll see what happens for max boost, what PSI that is at. The RPM sensor is super important - JB4 doesn't have that (maybe OBDII it does). And that's how TDI helps control boost spike and fuel dump. I'm very happy with the partnership with TDI at this point. Especially with the addition of a real boost gauge. I know in my gut, that this will be the better solution over JB4 at this point - for a plug and play system with the right MAP that has 7 modes + off. That's my hope and promise made by TDI. I'm sure we'll get there, only a few days remaining, probably by Monday night. Worst case, I will install the JB4 in it's place (with the OBDII cable, not happy about that) and rinse/repeat. Last edited by xcelir8bmw; 10-01-2020 at 02:49 PM.. |
|
Appreciate
0
|
10-01-2020, 03:10 PM | #182 |
Second Lieutenant
107
Rep 284
Posts |
okay, so i'll chime in and say that because this car is under warranty and because the device can be easily removed, i'm going to run map 2 only because i don't think that in normal daily driving -- even highway driving where the car is at a constant, let's say 2500rpm -- is going to have any detrimental effect on the internals. but, if it does, all i have to do is take the device off and bam! i have no idea what happened, mr. service advisor. i was just driving along as normal and then suddenly something went wrong.
it's either that, or i create a custom map like rice_rocket has done and if that's the way to go then i'm sure that the drivability of the machine isn't nearly going to be as fun as it is now and going back to stock after running it on map 2 is going to be even worse. it's a shame that map 1 is so poorly done, at least in our application of this variant of the b48 engine. thoughts? am i just a ticking time bomb using map 2 in regular driving where i'm not driving WOT and this car will never see a track day in its lifetime...?
__________________
Alpine White BMW X2 M35i
|
Appreciate
0
|
10-01-2020, 03:32 PM | #183 |
Major
303
Rep 1,087
Posts |
I agree with you Davy you'll be fine as from I gather with your driving behavior and traffic you will almost never see that 30+ Psi which is the only thing I'm worried about. The custom map is a breeze to make.. but I want that extra map2 oomfph!
|
Appreciate
0
|
10-01-2020, 03:45 PM | #184 |
Lieutenant
129
Rep 426
Posts
Drives: 2020 X2 M35i, 2005 Volvo V50T5
Join Date: Sep 2019
Location: Eastern Massachusetts
|
|
Appreciate
0
|
10-01-2020, 04:03 PM | #185 | |
Second Lieutenant
107
Rep 284
Posts |
Quote:
back to BMS the unit goes if they will allow for a return at this point and really they should because this unit isn't optimized for the variant of the b48 engine that we have in our m35is. if not, i guess i took a 650 dollar hit, but i'd rather that than lose an engine with BMW casting a suspicious eye. that aside, i broke a damn clip on one of the sensors - it's the little white thing that latches onto the sensor. like the entire thing itself still snaps on securely so i guess the white thing is superfluous or something? i dunno, but i broke it. oops.
__________________
Alpine White BMW X2 M35i
|
|
Appreciate
0
|
10-01-2020, 04:04 PM | #186 | |
Second Lieutenant
107
Rep 284
Posts |
Quote:
"The general principal of mapping is to run the engine at each of the defined rpm and throttle sites, adjust the fuel and/or spark to the required values and then save these changes in the ECU."
__________________
Alpine White BMW X2 M35i
|
|
Appreciate
0
|
10-01-2020, 07:23 PM | #187 | ||
Banned
550
Rep 949
Posts |
Quote:
From the JB4 FAQ: Quote:
|
||
Appreciate
0
|
10-01-2020, 07:31 PM | #188 | |
Banned
550
Rep 949
Posts |
Quote:
Post up your specific JB4 log here if you want more useful feedback but it sounds like you're misinterpreting the results and spreading unnecessary fear in the process. OBDII is currently required for all but the most basic "RaceChip" style tuning. Why would you ever unplug it? With no OBDII the tuning can't monitor throttle, air/fuel, knock, or anything else useful other than boost. I'll certainly relay to BMS what you are trying to do so they can at least enable the over-boost safety in your firmware for non-CANbus use. Last edited by Fuel-It!; 10-01-2020 at 07:44 PM.. |
|
Appreciate
1
xcelir8bmw405.50 |
10-01-2020, 07:38 PM | #189 |
Major
406
Rep 1,104
Posts |
|
Appreciate
0
|
10-01-2020, 07:41 PM | #190 | |
Major
406
Rep 1,104
Posts |
Quote:
|
|
Appreciate
0
|
10-01-2020, 07:46 PM | #191 | |
Major
406
Rep 1,104
Posts |
Quote:
|
|
Appreciate
0
|
10-01-2020, 07:48 PM | #192 |
Banned
550
Rep 949
Posts |
If you have the app the logging happens automatically. The default setting for the app is to combine all logs in to one file, if you've changed that setting on the logging tab just change it back. Then nothing special needs to be done. While connected the app will record data and from the app you can email the log to BMS or yourself, open in the charting tool in the app, or open in the free windows software, to view it.
|
Appreciate
0
|
10-01-2020, 08:09 PM | #193 |
Major
1606
Rep 1,480
Posts
Drives: 2022 M440xi GC
Join Date: Feb 2019
Location: Atlanta
|
Just out of curiosity, have you guys ever had issues with the alarm going off with something plugged in obd port? If I leave my scanner in and lock it goes off immediately.
|
Appreciate
0
|
10-01-2020, 08:30 PM | #194 |
Major
303
Rep 1,087
Posts |
Not with the JB4.. actually don't think I ever tried to lock it with my scanner in. And my e60 did not set the alarm off with it on.. I accidentally forgot it plugged in.
|
Appreciate
0
|
10-01-2020, 08:42 PM | #195 | |
Major
303
Rep 1,087
Posts |
Quote:
Thanks for popping in on this forum, I am not sure your exact relation with BMS, but I would love extra information. I have been patiently emailing back and forth with Terry since I got this unit, and I am waiting to hear his reply from my findings from today. I am not sure, however, how I am misinterpreting the results... I have proved over and over with logs sent to Terry that map 1 and map2 will freak out and put the car into map 8 failsafe. That is a FACT.. it does it. When I unplugged the OBDII sensor I could full throttle the map2.. which I admit made me a tad uneasy. With my eyes glued to the JB4 interface I could hold it steady way over 30psi. So what other conclusions would you come to? Anyways, I'm glad to put some logs up here.. let me see what I can grab. |
|
Appreciate
0
|
10-01-2020, 09:01 PM | #197 |
Major
303
Rep 1,087
Posts |
Here's a few with the custom map from may when it was pretty hot outside still. Boost add was 1, boost limit set to 27. To note I've managed a peak of 27.5 in this cooler weather with the map6. I was trying to find it, but can't dig it up right now.. I might have deleted it.
And.. if you could even try to explain why Map 2 is some magical map where the car is way more throttle responsive, and even shifts faster I would love to hear your input! |
Appreciate
0
|
10-01-2020, 09:16 PM | #198 |
Second Lieutenant
107
Rep 284
Posts |
okay, so i did install the obdii cable and the car/unit is/are not reading any data. it's as though i have nothing plugged in at all, although everything is clearly ultra mega tightly sealed.
also, i have the carb version of the unit, so i don't quite understand which firmware would protect against an unsafe amount of boost as would be expected with either 17 or 18, i forgot which now, but i don't have either of those, so that's inconsequential. i'm awaiting to hear back from terry from bms. hopefully i'll be able to use more than just map 1 because that would be lame af.
__________________
Alpine White BMW X2 M35i
|
Appreciate
1
xcelir8bmw405.50 |
Post Reply |
Bookmarks |
|
|