02-11-2016, 09:41 AM | #1 |
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B58 JB4 Customer Dyno Compilation Thread - Show us your Dynos!
As more and more of these cars are getting into customer hands I wanted to start a modding thread for the B58, specifically to get some end user data with the JB4 and any other mods you may have.
I'll start the thread with the BMS JB4 dyno, but can't wait to see some user data.. Last edited by Mike@N54Tuning.com; 02-11-2016 at 09:55 AM.. |
02-12-2016, 07:38 AM | #2 |
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STD correction, Smoothing at 5, and running far too lean on that dyno chart......
Let's see what BMS's test car makes with a more widely used SAE correction, less smoothing (to really see the curve spikes/dips), and a much safer 11.8-12.2:1 AFR??? |
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02-12-2016, 08:22 AM | #3 |
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All of these engines run lean. N55 is the same way. That's about par for the course.
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02-12-2016, 08:33 AM | #4 |
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The chart in post # 1 is BMS' test car and AFR's look normal given its beta map 1 stage just now and based on JB4's running for years on N54/N55
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02-12-2016, 08:37 AM | #5 |
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02-12-2016, 08:48 AM | #6 | |
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AFR: The AFR (Air Fuel Ratio in Lbs air/ Lbs gasoline fuel) trend displays for each bank under AFR1 for bank1 (1,2,3) and AFR2 for bank2 (4,5,6). Typical values are 15:1 at light engine loads decreasing to around 12.5:1 under heavy engine loads and high rpm. Note: The N54 is a direct injection motor and as such will run much leaner air/fuel ratios than many who have worked with older platforms are used to seeing. It's common to target 14:1 at peak torque and 13:1 at peak HP for example. It is also normal to have the AFR display 20:1 when car is coasting in gear or under a misfiring condition where the DME will cut off fuel to the misfiring cylinder(s). |
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02-12-2016, 08:53 AM | #7 |
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That's nuts..... I just don't see why it would be able to get away with it that lean. Lean is lean. We run our 550hp 10:1 NA engines at 12.7-13.0:1, and our 700-800hp Boosted ones at 11.7-12.0:1...
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02-12-2016, 09:27 AM | #8 |
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02-12-2016, 10:31 AM | #9 |
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Notice that the stock run shows the same lean AFR. They're right, all these new motors run much more lean that what we're used to seeing.
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02-12-2016, 10:34 AM | #10 |
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No wonder the canned tunes in my COBB V3 weren't great... I was seeing 11.6-11.9:1 AFR on most of the maps....
So if 13.0-13.8 is ok for N54/55, what would be approaching danger zone? Anything over 14.5:1? |
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02-16-2016, 10:10 AM | #11 |
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02-16-2016, 05:18 PM | #13 | |
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Mike |
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02-16-2016, 10:30 PM | #16 |
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Wow. So the B58 is running close to 15 PSI stock while the N55 is running 9 PSI. Do the power output differences between the two make sense with a boost delta of 6 PSI? Must be very different tuning strategies for the two different engines.
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02-17-2016, 12:41 PM | #17 |
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02-17-2016, 01:07 PM | #18 | |
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02-18-2016, 01:49 PM | #20 | |
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Also that graph has to be the tuned run... look at the throttle closures and the timing drops... thats not stock Im guessing you basing the power comment off of the graph. |
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02-22-2016, 03:14 PM | #21 |
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On a tuned vs tuned basis, isnt the N55 a better platform to start with vs the B58, due to the B58 being limited as far as added power ?
Whats the compression on either motor ? |
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02-23-2016, 11:49 AM | #22 | |
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Ecu tuning will come, they're getting closer and closer. N55=10.2:1 B58=11:1 B58 is leaving power on the table with the super lean mixture. |
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