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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Quarter Mile Times



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      07-17-2013, 08:12 PM   #45
v1nc86
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Usually I think I'm about 2500 rpm, not sure if able to launch at 3000 rpm...
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      07-18-2013, 10:33 AM   #46
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anyone notice a difference launching at 2000 vs 2500 vs 3000, shifting at 6000 vs 7000?
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      07-31-2013, 10:17 PM   #47
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1st run of my life.
Mods:In signature
Map: 5
Weather: maybe 75 degrees F and humid
Fuel: 3/4 tank of 93 + 2 Gal of e85
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08 335xi - JB4 G5 - BMS DCI - VRSF DPs - CXRacing FMIC, SteveAZ Inline Opt. 3, BMS e85 AT Flash - All Season Tires - 140k miles - 11.762 @ 118.40 (335xi Stock Turbo WR)

Last edited by knissel; 08-01-2013 at 08:17 AM. Reason: Added some details
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      08-01-2013, 01:20 PM   #48
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Yesterday night at Napierville Dragway (Quebec, Canada).

2008 BMW E90 335xi
Trans: 6AT
Mods: Alpina B3 TCU Flash, JB4 G5, BMS Speed Delimiter, BMS DCI, Cyba Air Scoops
JB4 configs: Map 5 (Autotuning), Boost on fuel, CANflap ON, Shift light 6000 RPM
Fuel: 94 octane
Outside Temperature: 22 Celsius (72 F)

60 Foot ET: 1.745
1/8 Mile ET: 8.074
1/8 Mile MPH: 85.76
1/4 Mile ET: 12.649
1/4 Mile MPH: 107.91

Video:



Time slip:

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      08-01-2013, 05:18 PM   #49
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Quote:
Originally Posted by v1nc86 View Post
Yesterday night at Napierville Dragway (Quebec, Canada).

2008 BMW E90 335xi
Trans: 6AT
Mods: Alpina B3 TCU Flash, JB4 G5, BMS Speed Delimiter, BMS DCI, Cyba Air Scoops
JB4 configs: Map 5 (Autotuning), Boost on fuel, CANflap ON, Shift light 6000 RPM
Fuel: 94 octane
Outside Temperature: 22 Celsius (72 F)

60 Foot ET: 1.745
1/8 Mile ET: 8.074
1/8 Mile MPH: 85.76
1/4 Mile ET: 12.649
1/4 Mile MPH: 107.91

Video:



Time slip:

Awesome time! Especially for only running 94 octane
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      08-01-2013, 05:23 PM   #50
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Thanks man!
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      08-11-2013, 12:22 AM   #51
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Any one try out the 2-step rev limiter on the jb4 ? The Xi should launch like crazy, I played around with it, it's pretty cool.
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      08-14-2013, 10:20 PM   #52
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which wheel sizes and width do you guys use for 1/4 mile racing and how much did afect your timing?
Did anyone tried ultra light wheels such as OZ ultraleggera?
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      08-15-2013, 06:39 AM   #53
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don't think we have to care about wheels, as long as you have proper tires... Stef (BobVader on this forum, 2008 e90 335xi 6mt) is doing 11.7 @ 118 with stock sport wheels and conti dw tires.
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      08-15-2013, 06:50 PM   #54
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Quote:
Originally Posted by v1nc86 View Post
don't think we have to care about wheels, as long as you have proper tires... Stef (BobVader on this forum, 2008 e90 335xi 6mt) is doing 11.7 @ 118 with stock sport wheels and conti dw tires.
11.7 my car was running 14.2 but it is 231hp remapped to 270hp diesel and automatic plus it was on 235/275 19'' wheels...(that is why I am asking whic wheels do you use)
I will have to remap to 290... but i have X drive problems and or A/T problems with slipping feeling... I am not sure which one is fucked as both of them is giving alarms lately ....
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      08-23-2013, 10:34 PM   #55
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2009 335xi
Trans: MT
Mods: JB4 G5 integrated, everything else stock
JB4 configs: Map 5
Fuel: E85 40%
Outside Temperature: 75F

Best times were 12.649, 12.671 and 12.749. This was my second time at the track, first time I was running 13s flat. My launches can still use improvement. I only had one good launch (12.649 run) where the car didn't bog down. I seem to either bog or burn the stock clutch...

Something happened with the JB4 on the first run because I was hitting 17.5 psi but my ignition was retarded by 7 deg. At the beginning of the run the IAT was 135deg so that may have been the cause (extensive idling before running is a bad idea!) or maybe false knock caused by the launch?

I basically had to do a couple of 3rd gear pulls afterward to let map 5 re-adjust. Due to the timing being pulled on the first run, the boost lowered to 14.5psi on the next run. I never got the car running 100% right because I was only hitting 16psi towards the end of the night. Unfortunately my laptop died after the first 2 runs so I couldn't continue logging.

Anyway, I think I can run low 12s with a better launch and a fully working tune next time.
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Last edited by Jewber; 08-23-2013 at 10:56 PM.
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      08-24-2013, 12:35 PM   #56
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1) 09 335XI AUTO
2) 80 degrees ohio
3) JB4, Map 5, 93oct - no ethanol (next time at track will do this!)
4) half tank
5) No weight reduction
6) novice, 3-4 times a year

13.01 at 106ish

What am i doing wrong? I see ppl with just a jb5 running 12.5-12.7? That seems like a huge difference just for upgraded software.
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      08-24-2013, 07:47 PM   #57
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Sounds like your 60' needs some work or you need to add some E85 or race gas. Most of my 60's are 1.6-1.7 with my 335XI setup.

Last edited by LQQKOUT; 08-24-2013 at 07:55 PM.
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      08-24-2013, 07:51 PM   #58
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What's ur 60 foot?
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      08-24-2013, 07:52 PM   #59
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Quote:
Originally Posted by dk79 View Post
thanks.
I will be trying the cobb e30 maps soon. hope that will give atleast 30-40 more awhp

I think bmw awd system is pretty solid as compared to audis. my friend had lots problems with his awd car. plus audis now have torque vectoring that causes a lot of understeer. I never heard of any awd system failing in an xdrive car or suv. also I have not seen any other car with this much tuning potential as the n54 platform.
Good luck with the COBB. I tried it once and sold it because it was way slower than the JB4, than tried it again when they came out with the E85 maps and it was still at least .2 slower than the JB4. You will need a custom tune for the COBB to keep up. Just my experience.
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