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Fellow M3/M4 Enthusiasts,

Would be very grateful if some of you could provide the short list of the best ECU tuning options along with HP/TQ gains and the cost. I recently just returned from my Euro Delivery trip of a fully optioned less ceramic brakes '16 M3 Mineral White and Full Silverstone interior. See my mini-trip report here in the EuroDelivery forum.

http://www.bimmerfest.com/forums/showthread.php?t=876177

My current ride is a '13 untuned 335is CV, my prior vehicle was the '11 Z4 35is which I did the Stage 2 ECS flash tune on. Curious to hear from some of you what you recommend most highly for the M3 and the different pros and cons of the various options. In my searching I came across a German based tuner (G-Power) that was claiming some pretty huge gains at what is a pretty steep price ~$3.5k euros. Anyone stateside have experience with this product and the claims? Thanks in advance for any and all replies.

http://www.carscoops.com/2015/06/g-power-offers-substantial-upgrade.html

"Thanks to an in-house developed Bi-Tronik 2 V2 ECU remap, the German tuning specialist was able to extract 552 horses from the 3-litre, 6-cylinder Twin-Turbocharged engine, making it as powerful as the standard M5. Come to think of it, the 700 Nm (516 lb-ft) torque figure surpasses the M5’s output, so that makes the tuned cars mightier than the stock V8-powered monster.

FYI, that’s 127 horses more than the stock engine delivers and if you think a remap on these things is a walk in the park; well, think again! To implement such an upgrade, G-Power had to crack the factory 128-bit encryption and while they were at it, a speed limit bypass was considered a must.

In fact, at the customer’s request, the Germans will raise the top speed all the way to a theoretical 330 Km/h (205 Mph), even if G-Power states that in reality the car will actually achieve only around 310 km/h (192 Mph)."
 

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Couple options out there right now:
JB4
ESS Flash
ESS Piggyback
Dinan Stage 1 and 2
Active Autowerke
Remus Powerizer

ESS Flash requires pretty good amount of labor to get the ECU out and send it off overnight to have it flashed. They offer 1 free reflash if the dealer somehow changes it.

For the most part, I think the majority of the F8X owners run JB4 or Dinan stage 2.

I personally like the JB4 for all the various map options, ability to customize and data log. There is also a bluetooth add on to where you can change all the settings via a phone or tablet. Pretty cool. Custom maps for E85 and Meth too. Requires plugging into the TMAP, MAP, Fuel Mass Sensor and EWG. You only need to plug in certain connectors depending on what you want. One thing I really like about the JB4 is the data logging and boost adjustment. So you can actually see how it's affecting your car.

My recommendation would be the JB4 ($800) if you want to tinker around, log data and eventually run something crazy like upgraded turbos and meth.

Then the Dinan stage 2 ($2700) - set it and forget it. Cant go wrong with this one either.
 

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european auto source
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We're ESS's Authorized installer/tuning facility for SoCal and can flash your M4 at our facility in Anaheim, CA. We're using the ESS T-500 flash on our M4 and couldn't be happier.

Feel free to contact me directly and we'll get you set up.
 

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Comparing Hp and torque to pick the right ECU tune is not the correct approach. All tunes are adjustable based on customer need and goals.

Most popular tune is the JB stage 1 and JB4 (both are piggys). Jb is very popular because it takes 5 minutes to install, offers instant power at an unbeatable price $379

JB4 is for more advanced users who are planning to do catless downpipes now or in the future. JB4 offers 8 different maps, one of the is fully adjustable, ability to read and delete codes, control boost by RPM, control boost by gear, datalogging, etc...
 

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Just read the Car and Driver issue of a modified M4 running the stage 2 upgrade plus exhaust and suspension for about $8k and such car was actually 2 ticks slower and worse handling than a previously tested stocker,I think somebody is being a bit optimist about the gains,I want to see results on paper before I pull the trigger on any upgrade,I would be happy if I got a second off the quarter but that seems not to be happening as of yet and I don't intend to be running exotic fuels and crap to get size able gains.
 

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Just read the Car and Driver issue of a modified M4 running the stage 2 upgrade plus exhaust and suspension for about $8k and such car was actually 2 ticks slower and worse handling than a previously tested stocker,I think somebody is being a bit optimist about the gains,I want to see results on paper before I pull the trigger on any upgrade,I would be happy if I got a second off the quarter but that seems not to be happening as of yet and I don't intend to be running exotic fuels and crap to get size able gains.
Exactly.


I like the sound of more power, but can someone point to legitimate tests that show what happens to the 0-60, 1/4 mile, and 0-100 times for an M3/4 that is tuned by JB/JB4 or Dinan State 2? I did just see the Car and Driver article on their website, and the 5-60 mph times were certainly much better (4.7 versus 4.1). Any info on JB and JB4?

Of course, there are other reasons to get a tune, I suppose. But many of us want real gains in actual real world situations and performance on the street. Not for the racetrack. I track an older 3 series. I'm not going to track my brand new M3 at this point.

:dunno:
 
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