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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications '14 550i X w/JB4 Dyno numbers
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      07-23-2014, 01:18 PM   #1
Sum1.
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'14 550i X w/JB4 Dyno numbers

Got up on the dyno yesterday. Hot and humid in the shop and ran on a Mustang which typically puts out lower numbers than a Dynojet. Guys say there's a 15% difference between them...who knows? Does seem low compared to what other cars are putting down for numbers both with and without the JB4 installed.

Stock: 341/389
JB4 set to 4:00: 406/444
JB4 set to 3:00 (where I'm running daily): 397/435
Interesting note: the AFR is consistent with and without the black boxes hooked up.

Not thrilled by the scatter of the curve at high RPM. Looks like maybe the car is pulling timing up high.

Would like to know which dynos the other guys around here are running on? If I add 15% to my numbers (467/510) and chalk it up to the type of dyno, my car is in line with others around this board. If you guys are putting down your numbers on a Mustang, I have a huge issue.
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      07-23-2014, 01:38 PM   #2
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I can't speak with absolute certainty, but I believe 4th gear is your closest 1:1 transmission ratio. I assume yours is the 8 speed auto like mine. I wonder what effect that would have on the numbers, I would think they would be lower.

I don't have a TU, so apples to oranges, but I did all my runs on a Dynojet.
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      07-23-2014, 01:57 PM   #3
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Hi,

I had checked on this before. 6th is actually the closest to 1:1. That seems kind of high for a dyno pull, so 5th is probably fine (130 MPH!). When I dynoed my Evo and my Integra GSR 5 speeds, we generally used 3rd even though 4th was closest to 1:1.

Their dyno does read lower than a dynoyet. Evo VIIIs would read about 200 or so stock while dynojets would read 220-230.
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      07-23-2014, 02:10 PM   #4
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Looked at the graphs. I've mentioned this before, but I'm surprised how lean our cars can run. I guess newer cars with direct ignition can do this for emissions and to be more green or something, but I'm used to Evo VIIIs where the A/F is down around 11 on pump and still under 12 with E85.

Is redline still 6500 in the 2014 N63tu cars? They were only revving to 5700 RPM max and the TQ and HP were done climbing for a bit. I guess that's why short shifting can be faster. Does look like it may be pulling timing up top?
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      07-23-2014, 02:20 PM   #5
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berkel,

I looked it up, and you're 100% correct on the transmission ratios. What am I missing about the 4th gear pulls? Does the community stick to those for consistency?
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      07-24-2014, 08:35 AM   #6
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Terry always did the 550 cars in 4th and M5 in 5th not really sure exactly why.
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      07-24-2014, 09:19 AM   #7
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Pulled in 4th and 5th with each adjustment. Think 6th would have been asking a lot of the car at 6000 RPM...maybe destructive. Posted the 5th gear graphs here (obv higher numbers) in Sport and manual shifting.

Still curious what dynos others are being tested on...
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      07-24-2014, 09:45 AM   #8
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Did this come from just the Stage 1 setup? The car seems pretty lean even in stock form..are you sure their A/F setup was reading correctly?
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      07-24-2014, 10:40 AM   #9
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Quote:
Originally Posted by Sum1. View Post
Pulled in 4th and 5th with each adjustment. Think 6th would have been asking a lot of the car at 6000 RPM...maybe destructive. Posted the 5th gear graphs here (obv higher numbers) in Sport and manual shifting.

Still curious what dynos others are being tested on...
i use AWD mustang dyno.
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      07-24-2014, 11:19 AM   #10
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BB,

Terry ran the M5's in 5th because of the DCT I thought. I still think I'm missing something for why 4th gear was used, because looking at the transmission gear ratios 6th is the closest to 1:1.

Sum1,

Did you let it shift during the pull? Starting in 4th, shift, finish in 5th? I was having all sorts of blips and false information the times they let it shift on the Dynojet. Not sure, the Mustang may be more consistent and not have similar issues.

For the group, do you think the standard used on the Dynojet leads to the belief that they read higher than the Mustang? A lot of folks use STD, where I believe SAE is considered more accurate. What I could find showed the STD readings were 2.6% higher than SAE (ex. 500 whp STD = 487 whp SAE). In my opinion a lot of the "Mustang is more accurate" stuff comes from that. Even BMS puts up dyno graphs using STD on a Dynojet.
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      07-24-2014, 11:46 AM   #11
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BB- What does your car pull on a Mustang? Asking because I remember a thread where someone thought their numbers were low and they found some warranty-type issues under the hood which needed to be addressed...was that yours?

GCL- That was recording after shifting from fourth into fifth so, no shift point on the graph. Still can't imagine pulling in 6th but if others are doing it, and that's where the higher numbers are coming from, I'd like to know.

As for the reading differences, I thought it happens because the Dynojet rollers are free to gain more inertia but the Mustang rollers are weighed to simulate the gravity of being on the road. ...how it was explained to me...

EB'r- The boxes for the new (TU) motors have an adjustable dial inside which looks similar to a clock. They are delivered at an 11:00 setting and can be turned up to ~5:00.

Still unsure if there may be something lacking under the hood. If my numbers are really as low compared to others as they seem to be...+/-40hp is a big swing.
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      07-24-2014, 11:53 AM   #12
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Quote:
Originally Posted by Sum1. View Post
BB- What does your car pull on a Mustang? Asking because I remember a thread where someone thought their numbers were low and they found some warranty-type issues under the hood which needed to be addressed...was that yours?
this is on my 2013 N63 engine

Stock Numbers: 354.9 / 394

BMS Stage 1 as it comes stock: 390/ 412.4

BMS stage 1 + 4 PSI: 421.5/ 467.9
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      07-24-2014, 12:46 PM   #13
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I went back and read threads on various forums about what gear to use, and people are all over the place, but one decent rule of thumb is to use the highest gear that is relatively "safe". For example, you may not want to spin 6th gear on our car to 150+ MPH on the dyno, even if it's 1:1 ratio. More load on the car as well. The 1:1 thing may or may not matter, depending on dyno, config, etc.

Here's an old thread with various viewpoints:

http://forums.nasioc.com/forums/show....php?t=1478091

For tuning, the gear and type of dyno may have an impact. For example, one argument is that Dynojets are not load based, so dynoing in a lower gear, like 3rd vs 4th in a 5sp Evo, will show a "higher" HP. If you're just getting numbers for comparison (for the same car on the same dyno), it probably doesn't matter. However, running a lower gear may not achieve the same "load" on the car, so your tune adjusted in 3rd gear may result in too much boost/load in a higher gear, like a 4th gear highway pull. I had a tune like this on my Evo at one point. 3rd gear was great, I couldn't do a long WOT pull in the higher gears without misfiring.

The Mustang dyno is load based, and when this shop (Dynotech) tuned my Evo, it was set for different boost in different gears, different maps for pump 93 vs E85, etc.. Cool stuff and car was a blast. Hope some smart person can crack our ECUs so we can get some custom tunes and unlock the potential in our 550s.

Regarding the a/f ratio, the posted ones I've seen have been around 13, which is much leaner than I would expect, but it appears to be consistent with or without mods. I think the old rule of thumb was ~12.5 A/F for an all motor car, but closer to 11 for a forced induction car on pump gas. With E85, you can run leaner. However, I'm guessing modern cars run leaner for emissions and efficiency sake?
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      07-24-2014, 02:28 PM   #14
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Quote:
Originally Posted by badblack550xi View Post
this is on my 2013 N63 engine

Stock Numbers: 354.9 / 394

BMS Stage 1 as it comes stock: 390/ 412.4

BMS stage 1 + 4 PSI: 421.5/ 467.9
Tried sending you a PM but your inbox is full. Can you shoot me a message sometime regarding what you had to do besides the tuner to run the extra 4 psi?
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      07-24-2014, 02:28 PM   #15
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Quote:
Originally Posted by e46beater View Post
Tried sending you a PM but your inbox is full. Can you shoot me a message sometime regarding what you had to do besides the tuner to run the extra 4 psi?
Race gas that's all.
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      07-25-2014, 11:26 AM   #16
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Quote:
Originally Posted by badblack550xi View Post
Race gas that's all.
Ok cool good to know thanks
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