[Tungtr09]

So I just ordered my jb4 today and I was wondering does anyone here have any of the Jb tunes installed onto their car and have had a problem with the engine? And if you did what did BMW say when you brought the car in? Did they do the work under warranty or did they void the warranty? I'm just wondering cause I just bought a extended warranty for my car and still have 60k left before it's up.

[materialdistractions]

I've had the JB3/JB4 for almost 2 years on my car and loved every minute of it. Had no engine problems what so ever and my car is my daily driver. However, I was only running the lower maps (map 5 on JB3 and map 1 on JB4) since I only have dci and exhaust.

[JayKay335i]

If you bring the car to the dealer with the tune they will void your warranty.

[chili36]

Thousands of miles with said tune, no problems to report. Still under warranty. Lots of fun!

Edit:
Remove ALL mods before dealer visits!

[Tungtr09]

Originally Posted by chili36

Thousands of miles with said tune, no problems to report. Still under warranty. Lots of fun!

Edit:
Remove ALL mods before dealer visits!

When you say remove all mods do you mean intake bov exhaust and tune? Or just the tune?

[Tungtr09]

Oh I'm also asking this because my car has had 3 hpfp replacements, 5 injectors replace and 2 electrical thing replaced and water pump and oil pump replaced. So I just want to know if adding this will cause more problems.

[rgpwr]

It's up to the SA when it comes to mods. Some will look past some (most) mods, while others will start raising hell for aftermarket wheels.

Never had a single issue with the JB4 in 13000 miles.

[Tungtr09]

Oh and do I need the bms cable for the jb4 cause I didn't buy that.

[rgpwr]

Originally Posted by Tungtr09

Oh and do I need the bms cable for the jb4 cause I didn't buy that.

You do for updates, logging, and some user adjustment. But not necessary for basic operation.

[Tungtr09]

Originally Posted by rgpwr

You do for updates, logging, and some user adjustment. But not necessary for basic operation.

Oh ok thanks. And is there a cheaper one I could buy? Cause they was selling it for like 40 bucks.

[XDEEDUBBX]

came from jb+ to jb4 now. Dealer has seen my dci's no problem but removed the tune every time. The jb4 will allow you to clear codes from the steering wheel buttons. But like everyone always says, remove all mods if you can. Other than that, no problems. I'm only running DCI's on jb4 map 5.

[Tungtr09]

Oh last question so I have on my car ultimate racing 2.5" catback exhaust, hks bov, and ultimate racing cold air intake. And I pump 92 octane. So what map should I run?

[bigdog34uz]

map 5 and buy the USB cable dont be cheap with the car!

[SteveMD]

I have been running JB3/JB4 for 12000 miles with no problems.

Take the thing out whenever you take the car to the dealer. Clear you codes. If you have a JB4, it will clear the codes for you. If you have a JB3 you will need a BT tool if you want to do it yourself.

[Tungtr09]

Originally Posted by bigdog34uz

map 5 and buy the USB cable dont be cheap with the car!

Map 5? Are you sure cause I read in some other post that if your car have some mods run on map 1 and maybe map 2. And if your car is fully mod run map 4-6? Correct me if I'm wrong please.

[chili36]

Originally Posted by Tungtr09

When you say remove all mods do you mean intake bov exhaust and tune? Or just the tune?

If you value your warranty Don't take any chances. EVERYTHING!

[bigdaddycane]

Map 5? Are you sure cause I read in some other post that if your car have some mods run on map 1 and maybe map 2. And if your car is fully mod run map 4-6? Correct me if I'm wrong please.

Map 5 is the "auto tuning" (sort of) map. You don't need to be fully modded to run this map. Map 5 optimizes most settings to YOUR car and target boost is a higher priority. Map 2 actually requires some mods whereas Map 1 and 5 do not.

I run Map 5 as I feel better performance on it than Map 1.

[Alpine Whiteboy]

Intake/BOV and exhaust shouldn't be a problem. All they are doing is increasing airflow. Just call your dealer anonymously and say "hello I was wondering, I just bought a 335i and will I void warranty if I put an intake and exhaust on it?". BAM problem solved.

I have intake (a HUGE 3.5" piping), Diverter Valves, and AR Downpipes on my car and nothing is voided. I just make sure I take out my JB4 before I take the car in.

[Slops]

Originally Posted by Alpine Whiteboy

Intake/BOV and exhaust shouldn't be a problem. All they are doing is increasing airflow. Just call your dealer anonymously and say "hello I was wondering, I just bought a 335i and will I void warranty if I put an intake and exhaust on it?". BAM problem solved.

I have intake (a HUGE 3.5" piping), Diverter Valves, and AR Downpipes on my car and nothing is voided. I just make sure I take out my JB4 before I take the car in.

so what do you do with the dp SES light when you take it in? I just bought the CAN tool from BMS again just for this reason, and i've tested it by driving around without my tune just to see how long you can drive the car before the light comes on... and its not very far.

[Tungtr09]

Originally Posted by bigdaddycane

Map 5 is the "auto tuning" (sort of) map. You don't need to be fully modded to run this map. Map 5 optimizes most settings to YOUR car and target boost is a higher priority. Map 2 actually requires some mods whereas Map 1 and 5 do not.

I run Map 5 as I feel better performance on it than Map 1.

So how does auto tune work?

[bigdaddycane]

Straight from Terry at BMS

"Adaptive PID is not the same as full "autotuning", but it's an important component to it. It's an algorithm to adapt the boost control to your cars specific wastegate stiffness, mods, local conditions, etc. We'll be building upon it in future releases while we simultaneously add the other components needed.

As you do subsequent WOT pulls you'll see the FFMAX value under user settings adjust itself between 0-130. This represents how much of the duty cycle increase is fixed/hits instantly and how much is variable through the PID process. Ideally you want most of the increase to come through the fixed/feed forward as it will result in you hitting your target much faster than waiting for the PID to integrate to it. But if the value is overly aggressive you'll get overshoot and throttle closure. So the adaptive PID ranges FFMAX based on historic data collected during WOT runs. Right now its ranging one value which scales the entire 3D curve but the next step on adaptive PID will be to have it learn on a cel by cel basis (rpm, gear, target)."

Again, Map 5 is PID, but not full auto tuning (that's why I said "sort of" in my original post.

[rmdvrs]

Originally Posted by bigdaddycane

Straight from Terry at BMS

"Adaptive PID is not the same as full "autotuning", but it's an important component to it. It's an algorithm to adapt the boost control to your cars specific wastegate stiffness, mods, local conditions, etc. We'll be building upon it in future releases while we simultaneously add the other components needed.

As you do subsequent WOT pulls you'll see the FFMAX value under user settings adjust itself between 0-130. This represents how much of the duty cycle increase is fixed/hits instantly and how much is variable through the PID process. Ideally you want most of the increase to come through the fixed/feed forward as it will result in you hitting your target much faster than waiting for the PID to integrate to it. But if the value is overly aggressive you'll get overshoot and throttle closure. So the adaptive PID ranges FFMAX based on historic data collected during WOT runs. Right now its ranging one value which scales the entire 3D curve but the next step on adaptive PID will be to have it learn on a cel by cel basis (rpm, gear, target)."

Again, Map 5 is PID, but not full auto tuning (that's why I said "sort of" in my original post.

Your half right. Map 5 is not solely the adaptive PID map. Adaptive PID has been active on all maps since about the 2/1 update. Map 5 is the autotuning map. Terry enabled map 5 with a basic adaptive/autolearning algorithm. Peak boost ranges between 12psi and 16psi based on historic knock sensor activity. Learning is enabled from 4700-6800rpm in 3rd and 4th gear. That was on the 2/1 update and on the most recent 2/21 update Revised map 5 algorithm from 0-20 steps down to 0-15 steps but with each step representing more of a boost change. Among other improvements of course.