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      05-10-2021, 09:21 AM   #45
997CABOVA
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Quote:
Originally Posted by translux View Post
That’s impressive. If my memory serves me that nearly a second faster than a stock G80 M3C.
Can’t wait to get a JB4.
So would it be safe to say a stock M3C would be under 6.5 with just a JB4 +4 PSI only???
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      05-10-2021, 09:44 AM   #46
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Quote:
Originally Posted by 997CABOVA View Post
So would it be safe to say a stock M3C would be under 6.5 with just a JB4 +4 PSI only???
i doubt it, the 6MT is software limited to run less boost than the comp but they are otherwise the same, with the JB4 you are bypassing those limits, the max power that is obtainable should be the same on both models. Differences in times at that point should come down to gearing and shift speed.
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      05-10-2021, 09:57 AM   #47
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Quote:
Originally Posted by chris3g View Post
i doubt it, the 6MT is software limited to run less boost than the comp but they are otherwise the same, with the JB4 you are bypassing those limits, the max power that is obtainable should be the same on both models. Differences in times at that point should come down to gearing and shift speed.
This is incorrect unless I'm misunderstanding how the JB4 works. The JB4 will add the same amount of pre-selected boost to both states of tune (Base vs. Comp). So the discrepancy in power should remain between the two. You are describing a flash tune, not this piggy back unit.
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      05-10-2021, 10:17 AM   #48
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Quote:
Originally Posted by mirob View Post
This is incorrect unless I'm misunderstanding how the JB4 works. The JB4 will add the same amount of pre-selected boost to both states of tune (Base vs. Comp). So the discrepancy in power should remain between the two. You are describing a flash tune, not this piggy back unit.
it's not incorrect, a few of the maps on the jb4 are additive like that, but the more aggressive maps are absolute boost targets. JB4 can do either. The times i posted were run on map 3 (absolute target of 22psi).
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      05-10-2021, 10:36 AM   #49
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Quote:
Originally Posted by chris3g View Post
it's not incorrect, a few of the maps on the jb4 are additive like that, but the more aggressive maps are absolute boost targets. JB4 can do either. The times i posted were run on map 3 (absolute target of 22psi).
Ahhh, I stand corrected. I appreciate the insight.
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      05-11-2021, 09:26 AM   #50
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Quote:
Originally Posted by chris3g View Post
so from some initial tests it does seem that the car limits the throttle in sport mode vs efficient mode especially in the midrange and this appears to result in faster times in efficient mode. EDIT - talking to Terry on email he doesn't think it's the case so don't take this as fact, i'll have to test more to see if the times are really consistently any different.

this is the best run i had and it's definitely possible to go faster as the start was slow on this one. might also be faster to start in 2nd as the car is well out of it's power band starting under 60 in 3rd.

overall this is around a ~ 2sec improvement 60-130 from what i was seeing stock.
You were seeing 10 seconds 60-130 stock?
Aren’t people saying stock is just above 9?
Also this is without downpipes?
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      05-11-2021, 09:45 AM   #51
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Quote:
Originally Posted by Shlomia123 View Post
You were seeing 10 seconds 60-130 stock?
Aren’t people saying stock is just above 9?
Also this is without downpipes?
who is saying that? maybe the comp is just above 9 stock, i don't think the 6MT is doing low 9 stock.

this is 100% stock + JB4.
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      05-11-2021, 09:51 AM   #52
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Actually here is another data point


this stock 6mt does 100-200kph in 9.2 which should be roughly ~ 10.5 60-130.
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      05-11-2021, 09:59 AM   #53
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Quote:
Originally Posted by chris3g View Post
Actually here is another data point


this stock 6mt does 100-200kph in 9.2 which should be roughly ~ 10.5 60-130.
Looks like it's 0-100 is at 4.2 but BMW advertises it as 4.1 altho on the dyno the manual produces more
HP and Torque than claimed.
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      05-11-2021, 12:53 PM   #54
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Quote:
Originally Posted by warcity View Post
Quote:
Originally Posted by chris3g View Post
Actually here is another data point


this stock 6mt does 100-200kph in 9.2 which should be roughly ~ 10.5 60-130.
Looks like it's 0-100 is at 4.2 but BMW advertises it as 4.1 altho on the dyno the manual produces more
HP and Torque than claimed.
.1 second can be the difference of the quality of that asphalt, tire temperature, driver or any small detail.
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      05-11-2021, 01:18 PM   #55
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That's very true.
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      05-11-2021, 01:56 PM   #56
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Quote:
Originally Posted by chris3g View Post
who is saying that? maybe the comp is just above 9 stock, i don't think the 6MT is doing low 9 stock.

this is 100% stock + JB4.
I don’t have data I actually have a draggy and gonna try to see stock what it is
I was always on the assumption of it being low 9 or high 8 I guess I got confused with the 60-130
I am gonna wait for ecu to be cracked and downpipes. I’m hoping the 60-130 can be better than a m5
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      05-11-2021, 02:05 PM   #57
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Quote:
Originally Posted by Shlomia123 View Post
Quote:
Originally Posted by chris3g View Post
who is saying that? maybe the comp is just above 9 stock, i don't think the 6MT is doing low 9 stock.

this is 100% stock + JB4.
I don’t have data I actually have a draggy and gonna try to see stock what it is
I was always on the assumption of it being low 9 or high 8 I guess I got confused with the 60-130
I am gonna wait for ecu to be cracked and downpipes. I’m hoping the 60-130 can be better than a m5
I hope I'm wrong but you might be waiting a really long time. The encryption we are dealing with here is not anything like what has been done in the past, I don't have that kind of patience.
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      05-11-2021, 02:56 PM   #58
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Quote:
Originally Posted by chris3g View Post
I hope I'm wrong but you might be waiting a really long time. The encryption we are dealing with here is not anything like what has been done in the past, I don't have that kind of patience.
Ya it’s gonna be at least a year which I don’t mind as it’s fast enough but more want the downpipes as I need this car louder
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      05-11-2021, 03:25 PM   #59
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Quote:
Originally Posted by chris3g View Post
I hope I'm wrong but you might be waiting a really long time. The encryption we are dealing with here is not anything like what has been done in the past, I don't have that kind of patience.
This is the only reason I think I'm looking at JB4. These newer platforms really take a long time.

With the kind of numbers you posted, I don't even think cracking the ECU on my own car will be necessary. I am sure we can run a custom map on jb4 once someone releases downpipes.
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      05-11-2021, 04:22 PM   #60
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What do you guys think of this instead of JB4 ?

https://www.racechip.us/shop/bmw/x3-...-442lb-ft.html

I am familiar with JB4 from my N54 years, just thinking about the simplest solution, IRC JB4 is a harder install that need a bit more work to remove for dealer visits.
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      05-11-2021, 04:50 PM   #61
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Quote:
Originally Posted by chris3g View Post
First service done and I just got the JB4 in. install isn't too bad, the IAT sensor is a bitch to reach but can be done from the top just removing the airbox. I still need to figure out how to cleanly run the OBD cable, just have it around the outside for now. Hopefully will have some results soon.
Just saw this, what was the time to install best guess?

I am getting an idea of removal just in case something was to occur that required a dealer review.
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      05-11-2021, 05:03 PM   #62
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Quote:
Originally Posted by Vic55 View Post
Just saw this, what was the time to install best guess?

I am getting an idea of removal just in case something was to occur that required a dealer review.
a couple hours the first time, had to figure out how to get to everything and then after it was all working i went back and redid it making the install mostly invisible with the wiring as clean as possible.

i could probably do it in 30 minutes moving forward.
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      05-11-2021, 09:44 PM   #63
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Quote:
Originally Posted by PLF69 View Post
What do you guys think of this instead of JB4 ?

https://www.racechip.us/shop/bmw/x3-...-442lb-ft.html

I am familiar with JB4 from my N54 years, just thinking about the simplest solution, IRC JB4 is a harder install that need a bit more work to remove for dealer visits.
No CANbus, no EWG, isn't going to make as much power or run as smooth. If you want a simpler more limited product though just install the JB4 TMAP + MAP connection and skip the CANbus + EWG connections. Then it's the same thing as a RaceChip but you retain the option to make real power when you're ready.
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      05-13-2021, 09:45 AM   #64
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I have a few specific questions related to my 2021 X3M that I am hoping folks on this forum can answer. Limited activity/success on the X3 forum.

1. Can someone confirm that if I install a downpipe, I can go into the JB4 desktop-based program and adjust the setting to clear CEL's? A link would be appreciated.

2. For 93 octane, are folks running anything other than Map 1? Map 1 feels nice, but nowhere near the power bump you'd expect from a flash tune (or even the JB4 map 1 on my old F80)

3. Would a straight midpipe (no cats/resonator) enable you to run other maps?

Thanks
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      05-13-2021, 02:35 PM   #65
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Quote:
Originally Posted by jgoldsmith729 View Post
I have a few specific questions related to my 2021 X3M that I am hoping folks on this forum can answer. Limited activity/success on the X3 forum.

1. Can someone confirm that if I install a downpipe, I can go into the JB4 desktop-based program and adjust the setting to clear CEL's? A link would be appreciated.

2. For 93 octane, are folks running anything other than Map 1? Map 1 feels nice, but nowhere near the power bump you'd expect from a flash tune (or even the JB4 map 1 on my old F80)

3. Would a straight midpipe (no cats/resonator) enable you to run other maps?

Thanks
You should be able to run maps 2 and 3 with 93 octane. Afaik code clearing is only manual and the car needs to be put in diag mode to do it, there is not any auto clearing of emissions codes.

I suggest you email burger with your questions as Terry is very responsive on email.
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      05-14-2021, 02:58 PM   #66
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My local guy installed JB4 on his new M3C I don't know if he wants anything posted yet waiting for him to respond on FB
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