07-02-2023, 01:42 PM | #45 | |
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07-24-2023, 12:05 PM | #48 |
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Congrats!
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07-31-2023, 11:16 AM | #50 |
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Learning about modding my new G42. Just got it a week ago. Coming from VW/Audi land where upgrading the downpipe is a part of going “stage 2”, and also typically involves an ECU tune.
It seems like it’s mostly a sound improvement option here, somewhat cheaper than a rear exhaust section upgrade. I may be wrong. Is there no tune involved/necessary when upgrading the dp on these cars? Are you not more likely to have warranty claim issues with a dp upgrade vs say an axle back upgrade? |
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07-31-2023, 11:26 AM | #51 | |
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2. No tune required if not wanted. You thinking old school. 3. Absolutely |
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07-31-2023, 12:09 PM | #52 | |
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I'm guessing BMW has locked down the ECU/TCU as well as they have with iDrive 8, making piggybacks like JB4 the only tuning option? Sorry for the thread hijacking... |
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07-31-2023, 12:24 PM | #53 |
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the piggybacks are the only option if you are not willing to ship your DME to Finland
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07-31-2023, 10:14 PM | #54 | |
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The o2 and knock feedback in the platform is obviously very robust. Hence people can use devices like JB4 and crank the boost for big power gains while their MAP sensors are voltage clamped to prevent the ECU from even seeing actual boost; yet still the stock tuning is able to keep the motor in 1 piece, at least so long as the knock and wideband sensors are working right. So consider that people can get away with doing that... the airflow gains from a downpipe are nothing but a drop in the bucket in comparison.. so I wouldn't worry one bit. |
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08-01-2023, 02:07 PM | #55 | |
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the jb4 is certainly a tuner, not a simple boost controller. the BMS stage 1 or JB+ is a boost controller, a lot of the piggybacks on the market are boost controllers. the JB4 is not one of them. Its got so many more features. It also can make the ECU alter the timing to make more power, not just boost.
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08-01-2023, 02:14 PM | #56 | |
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The JB4 is just an electronic wastegate boost controller. You aren’t actually “tuning” anything… only in the BMW world have I seen adjusting piggyback boost tables referred to as tuning. |
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08-01-2023, 06:01 PM | #57 | |
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If you looked at the wiring for installation you can see for yourself that it would not be possible (assuming you understand how these things work). It’s using knock feedback. Engine knock is detected and the ECU is capable of individual cylinder knock retard. It’s completely reactive self protection; not tuning. |
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08-02-2023, 10:49 AM | #58 | ||
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If you wish to continue the conversation, please keep it respectful. If not then you are entitled to your opinion, and i am to mine. We don't need to be responding to each other. One of the ways is called max cooling, where the Jb4 alters IAT, which makes the DME increase timing. I have a full thread on this where I tested the results on my car. And you can control it using the boost limiter + the lowest IAT you wish to post. I'm not trying to make a case that the JB4 is superior to a flash tune. My point is that the JB4 has unique features that a basic boost controller cannot replicate because its functions are limited to controlling boost alone. Putting the Jb4 and your regular boost controller in the same category does not make sense, given how advanced the JB4 is to, let's say, the JB+. you do not need to be a tuning genius to see the difference.
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08-02-2023, 11:50 AM | #59 |
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Ok you got me.
It’s not a boost controller. It’s a boost controller that *also hacks up your IAT*. That’s not tuning. It’s not a tuner. Installing a system that leans MORE into knock feedback and o2 feedback is bringing you further from a state of “tuned”, not closer. You’re simply misleading the less technical people here. |
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08-02-2023, 12:16 PM | #60 | |
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Is a flash tune ideal? Of course, but here we are with some Vikings in Finland demanding ransom for our ECU. |
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08-02-2023, 12:17 PM | #61 | |
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I have to agree with everyone else. Hacking a hack inside of a hack to crudely pull 2 maybe 3 degrees of timing by lying to the DME about air temps is not tuning. It’s putting you further yet away from a state of properly tuned. You’re still leaning on your knock sensors for all your live ignition tuning. Your DME logged parameters are further and further from accurate or meaningful. It’s literally a joke to call this tuning. |
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08-02-2023, 12:27 PM | #62 | |
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The JB4 offers logging of the DME parameters, and if it notices knock or lean conditions that are beyond the DMEs range of closed loop feedback control, it may try to correct it by adjusting boost. That’s another boost control function. Of a boost controller with optionally hacked IAT. |
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08-02-2023, 12:38 PM | #63 | |
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Is it a flash tune? No Does it change some of the parameters of the OEM tune? Yes, therefore it's a modified tune from the tuning parameters being requested. |
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08-02-2023, 12:39 PM | #64 | |
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Whether one prefers the JB4 is a different conversation and i agree with you a proper flash tune is superior. but again, that's not our conversation here. To reiterate your statement: "it is only a boost controller." Although you are not going to admit it, this statement is wrong. The JB4 is undoubtedly more than a basic boost controller.
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08-02-2023, 12:44 PM | #65 | |
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What you’re failing to understand is that the JB4 is not a piggyback tuner. It literally does not tune. It’s literally a boost controller. Just because it has some extra boost control tables doesn’t make it more than a boost controller. Boost controllers have never been referred to as tuners anywhere in the industry until BMS marketing. JB4 is not tissue papers to Kleenex. JB4 is like calling a box of bandaids an EMT. You have been grossly mislead. You seem to not know that there is such thing as a piggyback tuner, that actually tune. Well there are, I’ve used them. I am not here to argue if the JB4 is better or worse than tuning with a flash tune. I am here to tell you that a JB4 does not even tune! It isn’t a form of tuning at all! |
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08-02-2023, 12:48 PM | #66 | |
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To me, that makes it just a boost controller. If it’s extra gimmicks have you feeling like you need to hold it in higher regard, well whatever.. you go right ahead. Fact remains, the DME is using knock and o2 feedback to clean up after the JB4 took what tuning was there and threw it all out of wack. |
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