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10-04-2015, 03:37 PM | #89 | ||
Sameet
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The JB4 has had its fair share of problems, I am not saying it's perfect but then again, no tune is. Here's a good point Mike@N54Tuning pointed out, you hear more problems with the JB4 why? Because more people happen to actually use it. The people who have problems with the JB4, are the people who try to go above and beyond with power. Just like the guy who was running map 7 and detonated. It's an absolute targeting map, if you don't have the proper octane to run it, of course bad shit is going to happen. The DME can only pull timing so much. If you did the same shit on a flash tune designed for race gas and put 91, the exact same shit will happen. Like I said before, go back to your corner where you came from and come post when you think you have something knowledgable to say instead of starting shit. |
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10-04-2015, 08:10 PM | #90 |
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Join dates don't mean...well, they only mean when you joined the forum. Not a reliable indicator of anything else. That said, I've learned to ignore some folks, like M4 CSL, for good reasons.
Also, the reason you hear about more issues with JB4 is because the type of person who would use a JB4 is also the type of person more likely to post on car forums. Me, I'm very happy with my flash tune, but the JB4 seems to be a great piece of equipment, as well. Either way, in my non-expert opinion, I think neither one has anything to do with spinning a crank hub.
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10-05-2015, 06:03 AM | #91 | |
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It is definitely possible for the original design work with enough interference and or clamp load without a key way, even though the keyway is a good solution. Since this appears to be happening on stock, tuned, manual and DCT cars and given the mechanics of the forces applied to it I don't think we can attribute it to tuned cars making more power and over coming it, like a clutch. They may be more prevalent because their owners likely drive them harder but, who knows at this point. I'd say it's likely the torque to yield bolt either gives up or there is not sufficient stack up to get enough clamp load. I wonder if a solution might be as simple as an ARP fastener for the crank snout. |
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10-05-2015, 07:04 AM | #92 | |
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Again, IF this is a true issue, them knowing of the potential and not doing something would be quite nefarious, given the potential outcome. They did not understand that this could happen, or engineers would have taken care of this, for the pennies it woud have cost to enginner, amortized through production. |
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10-05-2015, 11:27 AM | #93 | |
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Drives: 2015 F82 M4 Blk on Blk, DCT
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2015 F82 DCT M4. Max PSI Built Motor, Ported head, Full Bolt Ons, Upgraded fuel system, Motiv Reflex and flex hardware for flex fuel, Max PSI Crank Hub Fix, Pure PS2+ Turbos, SSP Spec X clutch, xHP Trans Flash, DSS Axles. Custom Ecutek tune by Ian @bend calibration. 780whp & 700+ ft lbs torque, 18" HRE R101s.
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10-05-2015, 11:54 AM | #94 |
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You are adding absolutely nothing to this conversation. I don't believe you even understand the mechanical forces on this part or what it even does. I am here, like most others, trying to find out what is actually going on with this issue and you are only clogging up the thread.
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10-05-2015, 12:34 PM | #95 | |
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I believe the engineers completely understood the potential outcome of what would happen if this part allowed the timing of the rotating assembly to slip, if they didn't they shouldn't be engineers. I think they felt confident they had a good design that made production cheaper and easier while still being very reliable. Unfortunately for whatever reason there seem to be several cars both tuned and stock, manual and DCT experiencing this issue. Possible reasons range from poor design, manufacturing, QC to modifications or abuse by the owners. There are pictures in this thread of the aftermath so, I would say the "is it an issue" part is pretty well put to bed. How much of an issue and what cars does it effect is yet to be determined. |
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10-05-2015, 02:01 PM | #97 |
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10-05-2015, 02:54 PM | #98 | |
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Preliminary results are pointing to my initial suspicion that they spun the timing gear on the crank hub. |
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10-05-2015, 03:54 PM | #99 | |
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1. The piggy creed, If something goes wrong -Take it off and pretend you are STOCK. (Fact) 2. The cars that have said they spun cranks had JB4 (Fact) 3. We have had zero post here about STOCK cars, please refer to Number 1. In my opinion, this thread will not get anyone posting on it about a spun crank, as they won't want it pointed out that on previous occasions they had JB4. My contribution to this thread is, I think this is an issue CAUSED by screwing up the boost, and STOCK cars have nothing to Fear. (Unless 6MT and Money Shift) Why, because if you truly were always STOCK, you are covered by warranty. Any Stock owner that had this happen and was being refused warranty would scream their head off and cry LEMON law. I don't think anyone who is stock should worry about this. Just my opinion.
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///M4 | AKRA Evo & DP's | Brembo GT BBK | MSR CAI & CP's | MPSC2 |
Suspension : | KW CS 3-way | Dinan Toe Links | GC ARWJ & End links | IND Shims | SPL Control arms & End links | aFe Bars | Last edited by M4 CSL; 10-05-2015 at 04:06 PM.. |
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10-05-2015, 03:54 PM | #100 |
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One of my close friend's is a tech at a BMW dealer. He has personally fixed TWO cars that have had this problem. Both 6MT.
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10-05-2015, 03:57 PM | #101 |
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Was it a money shift, and did they happen to have a JB4?
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///M4 | AKRA Evo & DP's | Brembo GT BBK | MSR CAI & CP's | MPSC2 |
Suspension : | KW CS 3-way | Dinan Toe Links | GC ARWJ & End links | IND Shims | SPL Control arms & End links | aFe Bars | |
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10-05-2015, 03:59 PM | #102 | |
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I'm not against JB4. I wont put it on my car. But I would like to know the cause of the spun crank, so Stock owners or ones without JB4 can at least breath easy.
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///M4 | AKRA Evo & DP's | Brembo GT BBK | MSR CAI & CP's | MPSC2 |
Suspension : | KW CS 3-way | Dinan Toe Links | GC ARWJ & End links | IND Shims | SPL Control arms & End links | aFe Bars | |
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10-05-2015, 04:01 PM | #103 |
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Interesting I would think it would be more of a problem w/ DCT the way it shifts so fast, holds boost during shifts, and has more torque multiplication.
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10-05-2015, 04:02 PM | #104 | |
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And fucking BULLSHIT. 1. TRUE. But that is for ANY of the piggybacks. (fact) 2. FALSE! Two 6MT cars had this problem and they were guess what.. STOCK! 3. We have a post on STOCK cars. Please refer to number 2 In my honest opinion, this thread will not get anyone posting about a spun crank because you happen to be blaming a JB4 which does the same thing as every other piggyback out there but w/more features, and just like any flash out there which INCREASES boost. |
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10-05-2015, 04:04 PM | #105 | |
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10-05-2015, 04:09 PM | #106 | |
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And Yes 2 = Money Shift is the exception., I did put that in their to clarify. ' 3. We only have Money Shifts....so far.
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///M4 | AKRA Evo & DP's | Brembo GT BBK | MSR CAI & CP's | MPSC2 |
Suspension : | KW CS 3-way | Dinan Toe Links | GC ARWJ & End links | IND Shims | SPL Control arms & End links | aFe Bars | |
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10-05-2015, 04:11 PM | #107 |
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If you made a poll right now on this forum and listed all the piggybacks and how many people use which one.. You will find your answer.
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10-05-2015, 04:17 PM | #108 | |
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I'm not anti- JB4.....If I were to get a piggy, which I won't, it would probably be JB4. I prefer flash. Just my preference. I want to know the limits of the car like anyone else, and I want to know its weaknesses. If this truly is a weakness, then I would like to get this Mod. I don't want to Flash and Go BOOM either. Were are all on the same team. I love to mod, I just choose different ones, and I sure as hell want to know if we need this crank mod or not. If its a must I will do it.
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///M4 | AKRA Evo & DP's | Brembo GT BBK | MSR CAI & CP's | MPSC2 |
Suspension : | KW CS 3-way | Dinan Toe Links | GC ARWJ & End links | IND Shims | SPL Control arms & End links | aFe Bars | Last edited by M4 CSL; 10-05-2015 at 04:22 PM.. |
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10-05-2015, 04:24 PM | #109 | |
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10-05-2015, 04:30 PM | #110 |
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Exactly, its 100% why I want to know if this is a Boost problem. Screwing up the boost via flash is no different to the crank timing gear hub, than screwing it up via JB4 or any other piggy. So if it is more power creating the problem, I want this mod, before I flash.
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///M4 | AKRA Evo & DP's | Brembo GT BBK | MSR CAI & CP's | MPSC2 |
Suspension : | KW CS 3-way | Dinan Toe Links | GC ARWJ & End links | IND Shims | SPL Control arms & End links | aFe Bars | |
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