JB4 and Cobb Dyno Charts!

Mike@N54Tuning.com · 10-03-2011, 07:22 PM

I thought I would share this as there has been a lot of discussion lately on the different tunes and boost levels, and power output. So enjoy and hopefully this won't go down the tubes like some recent threads. As you can see from the dynes both tunes performed very well.

Quote:

The test car is our 2008 135i, 30k miles, 100% stock other than a dual cone intake and BMS oil catch can. Fuel is 91 octane with a can of NOS octane boost added to the full tank. Basically, 93 octane.

I have around 65 emails staring me down right now so some quick comments.

1) The JB4's low end approach of running less boost, less fuel, but more advance resulted in similar torque figures.
2) The JB4 map 1 is a little less aggressive up top than the Cobb "Aggressive" map and JB4 map 2 a little more aggressive up top.
3) I don't think a piggyback will be able to touch their air/fuel ratios below 5000rpm, but with less boost and more advance I don't think they need to either.
4) Just my personal opinion but I find the Cobb "linear" maps horrible to drive and the "normal" maps extremely too boost happy. Half throttle 12psi happy. I prefer the mapping we've setup in the JB4 which is around 8psi at half throttle. But, these things can always be adjusted.
5) Overall, I don't foresee JB4 owners trading in for the Cobb for improved drivability or power but the install process itself is easier which is very important to quite a few. I suspect Cobb will take over Vishnu's business on the top end of the market and then the question for many customers will be become whether the extra install time is worth the lower cost and additional features the JB4 offers.

1speedbike · 10-03-2011, 07:48 PM

Mike these are great graphs and a great comparison. Cobb and JB4 achieve very similar numbers, but do so in different ways. I was always apprehensive seeing some forum members' comments about how high the boost is using Cobb.. like 20 psi! Especially because of how conservative the dyno numbers were compared to a JB4 considering the relatively high boost. Now I know it's the timing. Iiiinteresting.

I also guarantee that this thread will go in a terrible direction very fast.

miro2296 · 10-03-2011, 08:53 PM

bignico_05 · 10-04-2011, 09:09 AM

Is this Cobb stage 1 or two?

Dhunckyn · 10-04-2011, 12:34 PM

Stage 1

Brian@bavarianx · 10-04-2011, 12:57 PM

Thank you for posting this!!!

M_BYEEE · 10-04-2011, 01:18 PM

Mike@N54Tuning.com · 10-05-2011, 09:03 AM

Quote:

Originally Posted by bignico_05

Is this Cobb stage 1 or two?

Stage1

Mike

10-03-2011, 07:48 PM	#2
1speedbike Brigadier General 732 Rep 3,274 Posts Drives: 2022 X4 M40i, 2008 135i Join Date: Jun 2008 Location: MKE iTrader: (15)	Mike these are great graphs and a great comparison. Cobb and JB4 achieve very similar numbers, but do so in different ways. I was always apprehensive seeing some forum members' comments about how high the boost is using Cobb.. like 20 psi! Especially because of how conservative the dyno numbers were compared to a JB4 considering the relatively high boost. Now I know it's the timing. Iiiinteresting. I also guarantee that this thread will go in a terrible direction very fast. __________________ 2022 X4 M40i - 2008 135i - 2015 F700GS On Order - 2024 i4 M50 Scruffy's gonna die the way he lived... Mmhm.
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10-03-2011, 08:53 PM	#3
miro2296 Colonel 57 Rep 2,251 Posts Drives: '08 Montego Blue BMW 135i Join Date: Nov 2008 Location: Round Rock, TX iTrader: (1)	__________________ ------------------------------------- BMW 135i/6 Speed/Montego Blue/Formula One Ceramic Tint/JB4 G4/AA Sport Intercooler/19 inch Iconz 880Z(19X8.5 & 19X10)/PSS 225/35 & 265/30/E93 M3 front sway bar/TRW front and rear Control Arms/BMS Drop In Filter/Dinan Exhaust/BlackLines/Upgraded \\\M RSFB
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10-04-2011, 09:09 AM	#4
bignico_05 First Lieutenant 78 Rep 368 Posts Drives: aw 135i m sport Join Date: Dec 2009 Location: montreal iTrader: (0)	Is this Cobb stage 1 or two?
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10-04-2011, 12:34 PM	#5
Dhunckyn Private 3 Rep 61 Posts Drives: 2008 135i Join Date: Feb 2011 Location: Albuquerque, NM iTrader: (0) Garage List 2008 BMW 135i [6.50] 1964 Chevy C10 [10.00]	Stage 1 __________________ -Brian 08 135i BSM \| Coral Red \| Dinan Stage 2 Software \| Burger OCC \|Berk Technology Mid-Pipe \| VMR 701 Wheels 225/255 Michelin PSS
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10-04-2011, 12:57 PM	#6
Brian@bavarianx Banned 170 Rep 2,268 Posts Drives: E36 M3 Join Date: Feb 2011 Location: Brea, CA iTrader: (8)	Thank you for posting this!!!
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10-04-2011, 01:18 PM	#7
M_BYEEE Brigadier General 145 Rep 3,269 Posts Drives: BSM X5M Join Date: Oct 2009 Location: Camarillo, CA iTrader: (7)	__________________
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