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chilam1019 chilam1019 is offline
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Default 03-14-2011, 12:12 PM

Great will wait for that Idrive radio off.
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JHOOPS2 JHOOPS2 is offline
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Default 03-14-2011, 12:22 PM

Exhaust Flapper FTW! You will make a lot of people giddy with that one T!


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GbreeE90 GbreeE90 is offline
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Default 03-14-2011, 02:38 PM

Terry I have a quick question about JB4 and fueling. If I understand correctly, the JB4 lets the stock DME adjust fueling. Obviously however it is set up works fine, but does the MAP sensor have a maximum anticipated pressure? I know in a lot of other vehicles with MAF sensors they have to upgrade the MAF sensor when running increased boost because it has a maximum anticipated airflow which causes static flow. I am just wondering how you achieve correct AFR.

Thanks!
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is online now
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Default 03-14-2011, 03:06 PM

Not quite following you. But the N54 uses wideband o2 sensors so always targets the programmed air/fuel ratio. We alter that ratio but the DME does the targeting.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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GbreeE90 GbreeE90 is offline
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Default 03-14-2011, 03:10 PM

Quote:
Originally Posted by Terry @ BMS
Not quite following you. But the N54 uses wideband o2 sensors so always targets the programmed air/fuel ratio. We alter that ratio but the DME does the targeting.
Okay, I was just confused. I know DME uses the O2 sensors but I thought it used multiple inputs to target the correct AFR. Thanks for clearing that up for me.
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(#1756)
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Blue Streak Blue Streak is offline
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Default Map 5 / 2 - 03-14-2011, 09:07 PM

I've been on map 5 exclusively for about 3 or 4 weeks now and have been very happy with it. I'm using Shell CA 91 with a mix of about 4 gal of Sunoco GT260 100 oct race gas. (intake/3"DP). But I switched back to map 2 tonight and there seemed to be much more power and stronger at lower rpm. I really haven't had a chance to do any strong pulls in map 5 in 3rd/4th gear in several weeks, so I just wanted to go back to map 2 and hit it hard on the freeway for a bit. It was great, but I'll probably keep it on map 5 most of the time and switch to map 2 on the fly once in a while when I want to hit it hard. That is as long as I've got some race gas in the tank.
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5soko 5soko is offline
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Default 03-14-2011, 09:09 PM

+1 i switched to map2 last night just for kicks, but it def felt like it had more punched compared to map 5.


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Blue Streak Blue Streak is offline
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Default 03-14-2011, 09:16 PM

I think I'll have time his weekend to take a long freeway drive with my laptop to do some data logging. I'll try several pulls with each map and the same blend of gas and see what's going on (and ask T's opinion of course). I want to stay safe, but maximize performance within reasonable parameters. If it looks worth while, I'll share on this thread or maybe let T decide if he want's to post it here after I e-mail the files to him.
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Dirty Dog Dirty Dog is offline
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Default 03-14-2011, 09:17 PM

Map 2 definitely stronger for me too but map 5 is the brains.


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(#1760)
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Blue Streak Blue Streak is offline
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Default 03-14-2011, 09:35 PM

Quote:
Originally Posted by Dirty Dog
Map 2 definitely stronger for me too but map 5 is the brains.
Yes, I agree. It's smoother and has a more deliberate surge in power that uses the whole RPM range, more like a N/A V8 than anything. (map 5). I enjoy both maps a lot, just depending on what I want at the time. Thank T for the on the fly map switching!
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(#1761)
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twinscrewcaddy twinscrewcaddy is offline
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Default 03-14-2011, 09:40 PM

what would be an equal or better JB4 map compared to JB3 Map 7 on 93oct and DCI'ed car?

thinking of doing the upgrade... i also have DO meth kit to add soon.
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(#1762)
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Bash Bash is offline
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Default 03-15-2011, 02:18 AM

Quote:
Originally Posted by JHOOPS2
Exhaust Flapper FTW! You will make a lot of people giddy with that one T!
What is the exhaust flapper? What does it do and will it give more power or something? Excuse my ignorance on the subject.
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(#1763)
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DCTepper DCTepper is offline
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Default 03-15-2011, 09:11 AM

Quote:
Originally Posted by Bash
What is the exhaust flapper? What does it do and will it give more power or something? Excuse my ignorance on the subject.
Someone please correct me if I'm wrong, but it's my understanding that the 'exhaust flapper' opens when vacuum pressure is high enough, such as during heavy engine load/wide open throttle. This allows it to remain closed and quiet the exhaust while cruising around town and rids the 'drone' some may experience on the highway. Having it closed also provides additional back-pressure which some suggests increases low-end torque response. However, under heavy engine load/WOT it opens up to reduce back-pressure and provide a more open exhaust, resulting in a louder exhaust and more power.

Regardless of the science behind it, most unplug it because they like the way the exhaust sounds (like me ), almost as if you have an aftermarket exhaust.
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mikeyt13 mikeyt13 is offline
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Default 03-15-2011, 09:21 AM

HOw do you unplug it?
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(#1765)
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DCTepper DCTepper is offline
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Default 03-15-2011, 09:26 AM

Quote:
Originally Posted by mikeyt13
HOw do you unplug it?
There is a vacuum actuator near the driver's side muffler with a black vacuum line running to it. Most unplug it and plug the vacuum line with a golf tee, thus why it's sometimes referred to as the 'golf tee mod.' The proper way to do it would be to also cap the actuator as well.

Back on topic - I took the time to throw down some solid 3rd/4th gear runs in Map 5 and I must say it now feels STRONGER than Map 2. I am in the process of compiling my datalogs and will post results once completed.
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(#1766)
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mikeyt13 mikeyt13 is offline
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Default 03-15-2011, 09:28 AM

Thank you
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(#1767)
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dirtyballoonot dirtyballoonot is offline
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Default New Install - 03-15-2011, 10:49 AM

My buddy is installing while I'm at work. He's being a bit overly cautious and claiming that I shouldn't "get on it" as soon as he's done. It was my understanding that it needed to be "opened up" to adjust. The instructions say "drive as you normally would", well, I drive like a maniac most of the time, so, what's the verdict?
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(#1768)
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alpinedevil335 alpinedevil335 is offline
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Default 03-15-2011, 10:55 AM

You'll need to do a few WOT pulls for it to adapt. So your driving like a maniac style is perfect. Just please be carefull.
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(#1769)
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dirtyballoonot dirtyballoonot is offline
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Default 03-15-2011, 11:35 AM

Careful, funny
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Larry Larry is offline
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Default 03-15-2011, 01:18 PM

I have the JB4 on order. When I get it can I update the firmware w/o it being installed in my car (someone else is installing it)?
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is online now
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Default 03-15-2011, 01:22 PM

It will ship with the latest. But has to be installed to update firmware. Have them install the USB cable and route it under the ECU cover so its accessible in the engine bay.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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(#1772)
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DCTepper DCTepper is offline
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Default Map 2 vs Map 5 - 03-15-2011, 01:53 PM

Like many others, I was curious whether I was missing out on some extra power by switching to Map 5, so I finally took an opportunity to log some 3rd and 4th gear pulls this weekend to compare the two maps. The results may surprise you, I know they did me!

Car: 2007 335i Steptronic
Mods: JB4 and BMS DCI (all else stock)
Fuel: 93oct
Air Temp: 40F

Map 2



Although boost peaked as high as 15psi, it seemed to taper from 14psi down to 13psi.

Map 5




What you can identify in these graphs is the system "learning." The first run starts out quite conservative (as it should), between 11-13psi. Run 2 was much smoother at 12-13psi. Finally, run 3 pulled HARD, starting from 15psi with a nice taper down to 13psi. I also notice that Map 5 pulls much harder than map 2 while driving around town, more low and mid-range torque in lower gears. Map 5 FTW!
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VictorFranko VictorFranko is offline
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Default 03-15-2011, 03:50 PM

Quote:
Originally Posted by twinscrewcaddy
what would be an equal or better JB4 map compared to JB3 Map 7 on 93oct and DCI'ed car?

thinking of doing the upgrade... i also have DO meth kit to add soon.

That would be the equivalent of somewhere between Map2 and Map7 on the JB4.

All of which would be over aggressive for just a DCI and pump gas.
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(#1774)
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dirtyballoonot dirtyballoonot is offline
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Default 03-15-2011, 05:11 PM

Ok...so, first impressions there's definitely more power...map 5 seems more like stock than 1 or 2...definate traction issues...I'll likely have to limit the boost on 1 and 2...

Odd issue though...in map 2 I hit the limiter and it engaged limp mode and got a CEL after bogging down...I've hit the limiter in the past with no issues...
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(#1775)
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prelude2perfect prelude2perfect is offline
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Default 03-15-2011, 07:54 PM

Quote:
Originally Posted by dirtyballoonot
Ok...so, first impressions there's definitely more power...map 5 seems more like stock than 1 or 2...definate traction issues...I'll likely have to limit the boost on 1 and 2...

Odd issue though...in map 2 I hit the limiter and it engaged limp mode and got a CEL after bogging down...I've hit the limiter in the past with no issues...
Have you done some WOT runs in 3rd and 4th gear in map 5 to let it adjust? It definitely shouldn't feel like stock once it hones itself in.

Why are you hitting the limiter on this car anyway? The stock turbos are so small that you're only hurting your car by going that far up the tach. You make more power underneath the redline so it makes more sense to shift before you even go into the red.


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