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Why do a MHD backend flash on Jb4?
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05-15-2018, 01:40 PM | #1 |
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Why do a MHD backend flash on Jb4?
Ive looked around a bit and cant seem to find answers although I see many people doing it. Given the mods in my signature, what benefit comes with doing an MHD backend flash? Within the coming months I'll have inlets and FMIC and that would mark my build complete...unless I get power hungry again and get a e85 fuel pump or upgrade turbos..
************************ 5/19/18 UPDATE AFTER MHD PUMP BEF: Editing this post because this needs to be said. A few hours ago I did the pump bef via mhd and all I have to say is: My. God. After a little driving and giving the car time to re adapt map 5 and dial everything in, I am in shock at the difference this made. Responsiveness, smoothness, faster spool + a couple more pounds of boost, and the car throws me even further into the back seat! If anyone ever is on the fence about doing a BEF, there is no reason to wait or debate it. The outcome is UNREAL! Couldnt be happier!
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2013 335is Manual
JB4 G5 ISO - MHD E85 BEF - E45 - Fuel-it Stage 1 - BMS DCI - ECS Chargepipe & BOV - VRSF 3" d0wnp1pes - Muffler Delete w/ 3.5in Magnaflow Tips Last edited by MSully96; 05-19-2018 at 06:47 PM.. Reason: WOW |
05-15-2018, 03:03 PM | #2 |
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I am FBO and just did this. It's so much smoother than with just the jb4. I'm hitting 17psi on map2 and it feels just like stock except I look down and I'm going twice as fast as I thoguht. I'm going to get on a dyno soon and see the difference.
I'm sure there's a more technical answer about what it does but based on the smoothness, I'm sure it's much healthier for the car as well vs just using a jb4 map 2 or 5. |
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05-15-2018, 06:54 PM | #3 |
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Two of the biggest benefits from the BEF that you'll experience are proper timing adjustments and proper management of the fuel system, the latter is especially useful for running e85 blends so you don't lean out the afr but will still both be beneficial even without e85.
Instead of the JB4 tricking the dme into thinking the car is running at different parameters, the DME itself will be tuned for them and handle control of it which is both a bit safer and will give you some extra power, plus the "smoothness" everyone notes when flashing an MHD map. My recommendation if your fuel pumps are healthy and you have access to e85 would be to run a BEF setup for e25 or e30, ethanol is a lot less likely to knock and will keep your engine temps down which both allow you to run more timing and can potentially prolong the life of your engine. Not only that but the extra low end torque and high end HP is a blast and extremely noticeable |
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05-15-2018, 07:56 PM | #5 | |
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From the FAQ:
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05-16-2018, 10:41 AM | #6 |
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Thank you all for the input and the article Mike. Definitely convinced and going to give it a shot. Assuming I have the right device, a kdcan cable, Im sure I can find a quick guide for how to do it. Im running e25 now and with my current setup the car feels great but knowing it can get even better just with a BEF before inlets and FMIC, insane.
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05-16-2018, 01:12 PM | #7 | |
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05-18-2018, 01:54 PM | #10 |
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Yeah not sure what you meant by that but okay.
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2013 335is Manual
JB4 G5 ISO - MHD E85 BEF - E45 - Fuel-it Stage 1 - BMS DCI - ECS Chargepipe & BOV - VRSF 3" d0wnp1pes - Muffler Delete w/ 3.5in Magnaflow Tips |
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05-18-2018, 02:39 PM | #11 |
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Somehow he posted in this thread but he thought he was in this one.
http://www.e90post.com/forums/showthread.php?t=1496354 |
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05-19-2018, 06:46 PM | #12 |
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Edited the OP, take a look.
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2013 335is Manual
JB4 G5 ISO - MHD E85 BEF - E45 - Fuel-it Stage 1 - BMS DCI - ECS Chargepipe & BOV - VRSF 3" d0wnp1pes - Muffler Delete w/ 3.5in Magnaflow Tips |
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08-17-2018, 05:45 PM | #13 | |
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08-17-2018, 06:45 PM | #14 | |
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08-18-2018, 03:54 PM | #15 |
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thanks for your reply man. I appreciate it. I will go with upgrading to JB4 to G5, THEN do the JB4 BEF with MHD. Since I did see some tunes stating it added 1-1.5 psi throughout each JB4 map.
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08-18-2018, 08:28 PM | #16 | |
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08-18-2018, 09:39 PM | #17 |
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Have the day the car feels night and day with the BEF and the JB4. Throttle response is definitely different, not in a bad way but car feels much happier and the power is much better in every map
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*big single (eventually)* For now... MHD tuned VRSF Race IC DCI ATM exhaust |
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08-19-2018, 10:46 AM | #18 |
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Can you explain to me how it works? You load the jb4 bef, but then run map 5 only?
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08-19-2018, 10:47 AM | #19 | |
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Also, general mhd question for those in thread. will I need dp fix for inspection, I've read mhd can pass inspection. PA allows one monitor unready, and jb4 only always have me a hard time with monitors |
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08-19-2018, 11:16 AM | #21 |
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No expert here at all but from what I've read I believe BEF is just designed to work in conjunction WITH JB4. It let's JB4 handle the target boost loads while BEF works in the back end to take care of vanos/timing/AF/ etc.etc. OTS Map does all of the tuning alone without JB4S features (gauge controls, safety, etc.)
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02-13-2019, 07:53 PM | #22 |
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I was also iffy about the backend flash for about 4 months. Your thread helped me decide whether to do it or not and I have no regrets since! I will never go back to the stock flash.
I’m in IL and ran 93 for premium and e30-e40 for e85 mix before fuel pump upgrade. I now run e60 with a stage 2 pump My experience so far is that on stock flash, car felt great, but very inconsistent. You also felt like you were really “pushing” the car to its limits everytme you floored it. Gas mileage was around the same as stock and it was fun, but flashing really did make a difference. I was eating injectors as well (index 8) and would constantly be logging to make sure everything was okay. On Pump flash, the powerband felt so much smoother. You didn’t have that strong “kick” feel you did with the stock map, but the speed was essentially the same and the cars powerband felt much more natural. Definitely had no regrets doing the flash. My main problem with pump flash was that I couldn’t see peak boost levels over 15ish on map 5 and I felt that timing was a bit low for the fuel I was running. Gas mileage was also far much worse than with the stock flash for some reason. Worth it for pump users forsure! Car felt like it came with 15psi from the factory. On Race flash, my car ran amazing. I usually run about a e40 mix and keep it on map 5, and my logs are pretty much perfect. I got that nice kick feeling back that I had with the stock flash, but my powerband felt 10x more smooth and the car pulls consistent everytime. Timing is much more aggressive and I’m seeing nice boost levels on map 5 that were very similar to the stock map setting and much better than pump settings (16-18psi peak on map 5). It was definitely better than both the pump and stock flashes. There were even a few times where I was forced to run just 93 and the car detuned itself safely. The only downside was that on map 1 and map 2, timing was still real low, close to pump flash timing, and I really just saw a gain with map 5. Still worth it though! On the e85 flash, I was expecting a huge difference since timing was suppose to be more aggressive and I had a stage 2 fuel pump now with more E content. Honestly though, it was very similar to the race flash. After the car fully retuned itself, I did feel a slight power increase and I am very happy with the flash, but if you’re running the race flash it is not TOO much of a difference. Every little bit counts though so I am still on the e85 flash . You can also run map 7 safely with the e85 flash and e60+ fuel so that is another advantage, although I love my map 5. I’m dynoing my car Friday so I will also share those results for people who are curious. To wrap up, I agree with the OP. Do the FLASH! If you have that special Bavarian tech cable or whatever it is, you can do it free with Windows. If not, all you have to do is pay like $60 bucks for MHD flasher license and you’re good to go! Worth it. I even passed IL emissions with the flash on. Hope this thread and my post helps someone make a decision like it helped me! |
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