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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > E90 Jb4 Boost Issues



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      08-07-2015, 11:56 PM   #1
IvansE90
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E90 Jb4 Boost Issues

Hey guys so I've finally insured my e90 335i.
However, when I floor it on map 1 or 2 my fuel/boost gauge only goes to half.
Which I think is 10psi for half way right? Anyways a lot of the time on map 2 it will only go to half, but sometimes it will boost way earlier and hit 3/4 on the gauge and spin tires in second. Why does this happen? I've only driven the car for less than 25km could that be why? But it makes no sense since map 2 is a constant 14.5 psi. By the way I have dci, vrsf dp and jb4 g5 is. Also when I parked the car and put it in neutral it randomly went into max cool, but oil temp were at 90-100 but I think that was just an accident in the settings.
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      08-08-2015, 12:38 AM   #2
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Running 91 shell octane btw
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      08-08-2015, 02:31 AM   #3
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JB4 is inactive until oil temp hits 160F. Stop going WOT until your car is properly warmed up. If you oil temp is above this and it is still doing it, get a log.
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      08-08-2015, 10:19 AM   #4
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<Keyshawn Johnson> going WOT in a cold car? COME ON MAN!
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      08-08-2015, 10:22 AM   #5
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Don't use map 2 if you aren't fbo
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      08-08-2015, 05:26 PM   #6
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The cat was completely warmed up at absolute running temperature. I drove it for 35 Min's before going WOT with outside temp of 25C
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      08-08-2015, 10:35 PM   #7
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Quote:
Originally Posted by IvansE90 View Post
Hey guys so I've finally insured my e90 335i.
However, when I floor it on map 1 or 2 my fuel/boost gauge only goes to half.
Which I think is 10psi for half way right? Anyways a lot of the time on map 2 it will only go to half, but sometimes it will boost way earlier and hit 3/4 on the gauge and spin tires in second. Why does this happen? I've only driven the car for less than 25km could that be why? But it makes no sense since map 2 is a constant 14.5 psi. By the way I have dci, vrsf dp and jb4 g5 is. Also when I parked the car and put it in neutral it randomly went into max cool, but oil temp were at 90-100 but I think that was just an accident in the settings.
Have you tried map 5? I don't even know why people drive in map 1 or 2.
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      08-09-2015, 01:53 AM   #8
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Yes in map 5 i get 15+ psi and it runs great.
I have cat back exhaust, dci, jb4 g5, vrsf dp isn't that almost FBO so I can run map 1,2 or 5?
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      08-09-2015, 12:13 PM   #9
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You are missing the most important part. An intercooler keeps iats down so you don't get timing pulled and can hit target boost levels
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      08-09-2015, 01:49 PM   #10
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So should I be running map 1 or map 5 with my current mods, I really prefer map 5.
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      08-09-2015, 06:07 PM   #11
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IvansE90 I suggest you learn more about what you have. Visit
http://www.n54tech.com/forums/showthread.php?t=10605
There it tells you what all the menus on your JB4 do, what maps do what, and links to learn how to fine-tune your car.

I would also suggest that you leave it on Map5, since you are not completely bolt-on yet, and you still need to do some learning before you can start playing around with Map3 and really turning up the boost.

I use Map3, but I'm FBO, stg2 LPFP, VTT Single Barrel Shotgun, 70%e85/30%91, TFT Inlets, and my list goes on.

I'm putting down 516rwhp-537rwtq with some room to spare on the tuning side.
Your safest bet to figure out what's going on is to do some logs in Map1, Map2, and Map5. You'll get the most power right now out of Map5 because it auto-tunes to conditions constantly so you're always running at "optimal" settings.
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      08-09-2015, 06:24 PM   #12
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Quote:
Originally Posted by IvansE90 View Post
Running 91 shell octane btw
You should not be running map2 on 91 octane. Map down to map1 or map5

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      08-09-2015, 08:41 PM   #13
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The thing is, I get EXTREMELY better performance on map 5 vs map 1 or 2. Unfortunately, I can't do any logs as I have yet routed my usb cable, and I don't know where I can redline 3rd gear as it most likely is at 160km/hr? I am not worried about map 1 or 2 as I am completely happy with map 5. In the near future I am planning to get a fmic and cp and backend flash to complete my build. I just want to make sure that I won't hurt my car by running/dailying my car on map 5 with the upgrades that I currently have. P.S. I will definitely research the JB4 much more in depth as I clearly have a lot to learn!
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      08-10-2015, 12:11 AM   #14
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Quote:
Originally Posted by IvansE90 View Post
The thing is, I get EXTREMELY better performance on map 5 vs map 1 or 2. Unfortunately, I can't do any logs as I have yet routed my usb cable, and I don't know where I can redline 3rd gear as it most likely is at 160km/hr? I am not worried about map 1 or 2 as I am completely happy with map 5. In the near future I am planning to get a fmic and cp and backend flash to complete my build. I just want to make sure that I won't hurt my car by running/dailying my car on map 5 with the upgrades that I currently have. P.S. I will definitely research the JB4 much more in depth as I clearly have a lot to learn!
All I use is map 5...I don't even know why map 1 or 2 exists..why not get the best boost you can--it's like buying a 335 and putting a throttle limiter on the pedal....If your ecu box is like mine routing that cable is a snap...just a little wire fishing.
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      08-10-2015, 01:28 AM   #15
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I don't get why lets say map 2 is 14.5 psi and I cant run it in my car, but map 5 I get a tad more than 15psi and I can run it? That doesn't make sense to me.
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      08-10-2015, 01:52 AM   #16
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You know to really be definitive you need to hook up that usb and do some logs and then you can see the real boost number..it's hard to get the exact number from the gauge...and you could send that to jon@bms.Com or post at n54tech for advice.
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      08-10-2015, 08:25 AM   #17
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Verify firmware/settings are correct. Isn't there new firmware/settings that can make map 1 15psi and map 2 17psi for back end flash users. Just brainstorming possibilities of why map 5 would work and not map 2. Also running map 2 without intercooler is fine. Your not FBO without it but that's not the requirement. DPs are the requirement as it keeps EGTs down significantly by removing the choke (close coupled factory cats). 14.5 peak boost is still pretty conservative IMO. Map 1 and 2 exist because they are absolute targets and some people want consistency or an absolute target all the time.
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      08-10-2015, 08:54 AM   #18
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So when I dyno my car this saturday, should i keep it on map 5 or map 2?
P.S I will use Chevron 94 from now on!
What rwhp numbers should I be expecting with my mods?
catback,vrsf dp, dci, jb4
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      08-10-2015, 09:27 AM   #19
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390ish whp
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      08-10-2015, 10:33 AM   #20
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Quote:
Originally Posted by IvansE90 View Post
I don't get why lets say map 2 is 14.5 psi and I cant run it in my car, but map 5 I get a tad more than 15psi and I can run it? That doesn't make sense to me.
It depends on where the boost is. Down in the mid range you can run higher boost without a concern, for the most part. Where the concern comes in is how much boost you are running on the top end of the RPM range.

Depending on your mods, elevation, octane and temperatures will determine how much you can run on the top end.
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      08-10-2015, 01:32 PM   #21
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I don't know why but my car doesn't feel nothing like 390whp
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      08-11-2015, 10:21 AM   #22
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take logs. map 1 is probably the best map for you with those mods. map 2 is usually too aggressive on the stock flash without a fmic or e85, as is map 5, they'll pull a lot of timing.
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