[Shmoked]

Originally Posted by Fuel-It!

It's been out since 2008 lol. If you want a lot of power and features without having to void warranty with a flash the JB4 is the best way to get there. If you want exhaust pops and bangs you're going to have to bite the bullet and reflash it.

I ran it on my old 340i was very impressed with it, just wasnt sure if i wanted to do it again or try something new

[M340_pilot]

Originally Posted by Fuel-It!

It's been out since 2008 lol. If you want a lot of power and features without having to void warranty with a flash the JB4 is the best way to get there. If you want exhaust pops and bangs you're going to have to bite the bullet and reflash it.

Can I manipulate the oil and coolant temperatures and/or disable the cold start procedure with the JB4?

[Fuel-It!]

You can adjust the exhaust flappers in dash to be full time open or full time closed. You can't change the oil or water temperatures.

[chenry]

Originally Posted by Shmoked

I ran it on my old 340i was very impressed with it, just wasnt sure if i wanted to do it again or try something new

try something new Whether it be MHD, Carbauhn, PTF or Mission Performance (my personal pick based on personal experience but others are good too) IMHO you will be most impressed.

Piggyback can not hold a candle to what you get with a flash - while some may show numbers (and show draggys and dynos) the linear power delivery of a flash is just like it was given to you by the factory.

And if someone claims "warranty" of a flash vs a piggyback - I would strongly encourage you to investigate their motives (point is some will start a warranty conversation while they are in fact selling a product)

I've had both - no comparison :-)

ps- you are in new york several members here from NY are running flash tunes-maybe hit up your local regional forum (here) to connect and ride.

[Fuel-It!]

Warranty isn't a selling point just a difference to consider before you take the plunge on flashing as you can't go back after: https://f80.bimmerpost.com/forums/sh....php?t=1739110

In terms of JB4 potential if properly setup you can make pretty good power, this is a dyno of our Z4 running JB4, exhaust, 40% E85 fuel. Almost 500whp. That said there are things you can only do by adding in a flash map like exhaust burbles, speed limiter, and a few others.

[Fuel-It!]

Saw this posted recently, looks like they are auto detecting the flash maps now during service and voided proactively.

[Gdiddy23]

Originally Posted by Fuel-It!

Saw this posted recently, looks like they are auto detecting the flash maps now during service and voided proactively.

This doesn't surprise me but I'm sure the tuners will eventually find a way around this too. Can't really blame BMW for implementing this either.

I still don't know if I'd trust a piggyback tune until it's 100% confirmed the new software won't pick that up either. This is the exact reason I haven't tuned mine.

If bmw would come out w an MPPSK for the M340 (which I seriously doubt), I would have absolutely opted for this 100% tho

[Fuel-It!]

Originally Posted by Gdiddy23

This doesn't surprise me but I'm sure the tuners will eventually find a way around this too. Can't really blame BMW for implementing this either.

I still don't know if I'd trust a piggyback tune until it's 100% confirmed the new software won't pick that up either. This is the exact reason I haven't tuned mine.

If bmw would come out w an MPPSK for the M340 (which I seriously doubt), I would have absolutely opted for this 100% tho

Yes it's always cat and and mouse, I haven't heard of piggybacks being detected with the new BMW software but who knows what they've changed. Worst case BMS will have to counter adjust. Doing the same for flash tuning is going to be very difficult due to how the flash tuning itself is implemented and works.

[possible335i2008]

So as a thinking experiment how would a piggy back be detected if it is uninstalled correctly prior to a dealer visit?

[nola2atx]

Originally Posted by possible335i2008

So as a thinking experiment how would a piggy back be detected if it is uninstalled correctly prior to a dealer visit?

My guess would be checking logs for abnormal boost levels and such

[chenry]

Originally Posted by possible335i2008

So as a thinking experiment how would a piggy back be detected if it is uninstalled correctly prior to a dealer visit?

Just passing on info here that maybe can help...do not ask me for a deeper dive because I will not be able to help you HA - I am not that talented

I asked this question of a current BMW dealer mechanic (who is running a piggyback on his F80) a week or so ago who happened to be at a friends house doing some work - and his response included terms like "fuel trim" and "fafsta data." I don't really understand on a deep technical level what that means. Basically said while of course he could not prove something had been installed and physically removed the evidence of engine performance manipulation by some non-factory force left tell tale signs somewhere (again don't ask me)

Going on that I did a quick search and came up with some information that may also help you. It's not really one-sided which is good but in that it is consistent with what was verbally shared with me I found it of interest - perhaps you will too :-)

Anyhoo hope this helps....

The screen shot was posted several years ago and while it touches on uninstalling things incorrectly it also touches on those items that were shared with me and I think gets to your question in terms of discovery methods. Also came across a post that had some good back and forth (link provided)- there are others but these are the two I booked marked that helped me better understand both sides of the discussion.

Link to thread: Debate: Can BMW detect a Piggyback and will they void your warranty for it
https://f80.bimmerpost.com/forums/sh...osely%20enough.

Screen shot of comments from tech/forum member (from a different thread)

[possible335i2008]

Saw some more information regarding this basically all flash tunes are being detected now even after removal and those cars are being flagged, which could pose an issue for anyone leasing. There is a big thread on Facebook regarding this

[Fuel-It!]

Originally Posted by possible335i2008

Saw some more information regarding this basically all flash tunes are being detected now even after removal and those cars are being flagged, which could pose an issue for anyone leasing. There is a big thread on Facebook regarding this

They could always detect flash tunes before but the change now is that they are auto flagging cars. So that great relationship you have with your service advisor or technician is no longer useful. When they plug in for their standard scope it automatically determines if the car has been flashed, even if the flash was removed, and tags the VIN in BMWs system with a "suspected tuning" warning resulting in power train warranty denial. Most likely will result in lease return being refused also but not sure if that is true or rumor.

[Gdiddy23]

Gonna be like navigating a mine field for those looking to buy used F80's lol

I've been tempted to tune my 340 but after reading these posts I'm just gonna keep mine stock as long as I lease. If anything would go Dinan or Carbahn for warranty

[possible335i2008]

Originally Posted by Gdiddy23

Gonna be like navigating a mine field for those looking to buy used F80's lol

I've been tempted to tune my 340 but after reading these posts I'm just gonna keep mine stock as long as I lease. If anything would go Dinan or Carbahn for warranty

Thinking the same thing too, I feel bad for the guys with leases.