08-02-2016, 09:15 AM | #23 | |
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I have 47 months left on my lease so I'll eventually see what it does to my X6M. I don't expect to do 1/4 mile race starts at "every" street corner though, so ... I should be ok! It may cost you premature brake wear and your face will hurt from all the smiling you do, however.
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08-02-2016, 09:31 AM | #24 |
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You could be right. The massive amount of torque the V8 TT already makes is impressive. With a 3 psi increase I dropped a full second off my 0-100 mph time. With AWD, I still think going on up another 100ft lbs over that without tire slippage is going to test the BMW factor of safety. Hopefully nobody breaks anything, but I have already heard of 2 drivetrain failures that had custom ECM tunes. Not sure of their power level. Could have been more than 5psi.
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08-02-2016, 11:28 PM | #25 | |
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M3 where are you located?
I was taking to a reputable tuner that uses jb4 and their full DME tuning and he mentioned that they experienced issues on the f85 chassis with jb4 and BCM. BMS states it works but their replies are only by email and very short. Very little details and not enough for me to pull the trigger. My catted high flow downpipes are going to be installed Friday and was really looking for jb4 to be able to generate a little more boost and get rid of the CEL. I am running race chip already Quote:
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08-03-2016, 09:29 AM | #26 | |
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08-03-2016, 09:30 AM | #27 | |
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08-03-2016, 10:31 AM | #30 |
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That's just a small issue for massive power benefits. Trans is used in the HellCat and has options for more strength when you need it. The diffs are more complicated. OEM parts so far. Hammer Down !
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08-04-2016, 09:24 PM | #33 |
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Unless you have the fuel for it
27+ psi is where things get dangerous
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08-05-2016, 05:49 AM | #34 |
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08-05-2016, 07:50 AM | #35 |
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RC and JB4 are two completely different animals. RC will raise the factory boost arc but it is still an arc. Example if factory peaked at 15 psi at 5000 rpm and dropped to 13 psi at 6500 rpm to shift, RC could be adjusted to give you 18psi at 5000 and 16psi at 6500. Increased boost but still an arc. The cel you are referencing most likely is set by exceeding the fuel octane knock threshold with too much boost plus too much ambient air temp, etc.
JB4 BCM opens up a whole new tuning platform where you can adjust the arc out to a flatline commanded boost, plus it will reset your ECM automatically to delete cels if you remove your cats, etc. It can make tremendous power but should only be used by accomplished tuners that understand when they have exceeded pump octane levels and what to do when it is exceeded. |
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08-08-2016, 12:45 PM | #36 | |
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08-16-2016, 12:03 AM | #37 |
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Update:
Got JB4 with BCM installed today, running map 2 with 94 octane. Some thoughts: 1.This thing is stupid (ludicrous is trademarked to Tesla so...). No one really needs an SAV that is this fast. 2.All that Torque made me a little nauseous. Like, roller coaster nauseous. 3.I love it, this vehicle should be like this from factory. Feel like I've finally got an M now, and was previously driving an N63 (the non-M engine).
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08-16-2016, 01:17 PM | #38 | |
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I am not sure if that is suppose to encourage or discourage me from instilling the JB4. Did you do the install your self? were there any videos to guide you? Can you post a video of this "roller coaster" ride?
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08-16-2016, 01:25 PM | #39 |
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How is the transmission behaving with all that extra power? When I put turbos on my Jeep SRT and got to around 600whp, the transmission wasn't too happy. It didn't break, but it was extremely jerky and wasn't fun to drive.
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08-16-2016, 08:45 PM | #40 | |
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At cruising speeds, in comfort mode, it feels stock until I solicit it for more power. In fact anyone, like my wife, who drives 10 over the limit and accelerates softly will never notice it's tuned.
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08-16-2016, 08:58 PM | #41 | ||
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I will happily film a closed course event but I have nowhere I know right now where I could do a good demo without seriously breaking local traffic law (I work in public safety so I can't do stupid stuff).
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08-17-2016, 02:39 AM | #42 | |
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They sent me the link to the install guide... It looked like some serious work... even though someone did the transformation in 1 hour. http://www.n54tech.com/forums/showpo...93&postcount=3 |
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08-17-2016, 06:23 AM | #43 |
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Sounds like a huge difference! Has anyone had a Dinan tune to compare? The install seems to be painful enough that it can't easily be removed for service, so I would be concerned about warranty.
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08-17-2016, 07:26 AM | #44 |
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About the install
It does not take 1 hour, I watched an experienced mechanic do this and by the time the OBD2 port cable is routed inside and everything is done it took two hours. It was his first X6M but he had done it for 3 series and 5 series vehicles on my occasions. If I had to do this on my own it would likely take 3 hours and I would break clips and scratch stuff About taking it in for service I am going to take it for regular service with map 0 on (JB4 off) and disconnect the BCM from OBD2 but I wouldn't take the entire thing off unless I had a big issue with the car and I wanted to avoid senseless finger pointing (or interfering with the technicians diagnosing work). If, for example, I blow a turbo I would be honest about having a piggyback and leave it at BMWs discretion to cover it or not; "You play, you pay". I had an APR stage 3 VW Jetta 2003 back in the day and the tranny blew after 3 years. I was totally honest with the dealer and they replaced it on warranty anyway. Not saying this would always be the case but I would recommend being honest and accountable for one's actions. After all, misrepresenting the facts (the existence of mods) to gain a financial advantage (the repairs and parts) constitutes fraud to some extent and in most jurisdictions.
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