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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Dyno Results



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      10-27-2011, 09:53 AM   #23
Mach V Dan
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Here are some graphs from neovb's dyno session.


This is in fourth gear, at 100% and 0% settings.



100% and 0% settings, fifth gear.



100% settings, fourth gear compared to fifth gear.

Note that we use SAE correction, which is going to read a little lower than the STD correction I often see around this forum.

Quote:
Originally Posted by Ron1n
The car is best tested in 4th, in manual (M4). It provides more control and consistency in the test. Testing in 5th is a waste of time...
To me, every dyno pass we do adds to our store of information. It's never a waste of time.

Quote:
...not to mention, I question whether or not it skews the #'s.
It does result in different numbers on turbo cars, because the higher wheel load means there's more time for exhaust gas pressure to build in the manifold. All other things equal, you'll see the turbo spool up lower in the RPM range, and you may see higher boost levels at low RPM in the higher gear. The longer pull also will generally result in more heat buildup at the end of the pull, which can mean lower top-end numbers.

But if the car will see high load conditions on the road (and it will) I do like to get some readings from the higher gear.

--Dan
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      10-27-2011, 12:32 PM   #24
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Those charts look great! It would have been nice to do a run with the JBD removed for a stock baseline. The min setting adds 15-20hp I believe.

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      11-06-2011, 02:13 PM   #25
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267 sounds too much WHP for stock. That would be close to 310-320 crank, which is far more than BMW quote.
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      11-15-2011, 04:28 AM   #26
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Dyno's are kinda useless for relying on their PEAK numbers. Every dyno-be it the same make and model-will read differently(Dynojets usually read the highest of all the brands, and it can be as much as 20% or more). For that reason, you need to pick one, and stay with it. Their uses are many, but for power cataloging, you pretty much want to baseline the car stock, then run it again after each mod, so you can see if you gained or lost, and how much and where(PEAK isn't all that...bottom end and MID-especially on a track, is very important). Despite the peak numbers varying wildly, changes-gains or losses, are valid numbers.
Since you're using the dynojet, you need to keep this in mind, ESPECIALLY if the shop just installed a mod of some sort, and is gonna show you it's improvement.
You'll see at the top of your dyno sheet the word 'Smoothing', and it's setting can be anywhere between 1 and 5. What it is basically is how 'smooth' the plot lines are. A shady tech will set it at 1, because the plot(s) will be so erratic that it'll actually show an additional bogus hp or two.
You WANT your smoothing to ALWAYS be set at 5. If you see the number change(down to 1 or 2 specifically), get your money back and go somewhere else.
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      11-15-2011, 12:58 PM   #27
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Quote:
Originally Posted by YoKev View Post
Dyno's are kinda useless for relying on their PEAK numbers. Every dyno-be it the same make and model-will read differently(Dynojets usually read the highest of all the brands, and it can be as much as 20% or more). For that reason, you need to pick one, and stay with it. Their uses are many, but for power cataloging, you pretty much want to baseline the car stock, then run it again after each mod, so you can see if you gained or lost, and how much and where(PEAK isn't all that...bottom end and MID-especially on a track, is very important). Despite the peak numbers varying wildly, changes-gains or losses, are valid numbers.
Since you're using the dynojet, you need to keep this in mind, ESPECIALLY if the shop just installed a mod of some sort, and is gonna show you it's improvement.
You'll see at the top of your dyno sheet the word 'Smoothing', and it's setting can be anywhere between 1 and 5. What it is basically is how 'smooth' the plot lines are. A shady tech will set it at 1, because the plot(s) will be so erratic that it'll actually show an additional bogus hp or two.
You WANT your smoothing to ALWAYS be set at 5. If you see the number change(down to 1 or 2 specifically), get your money back and go somewhere else.
The shops didnt install the mods, they only ran the dyno tests. I would have stuck to one machine, but sadly the first shop was unable to get a torque reading (couldnt find RPM signal). Smoothing was set at 5 or 6 for all runs.
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      11-15-2011, 10:21 PM   #28
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Quote:
Originally Posted by neovb View Post
The shops didnt install the mods, they only ran the dyno tests. I would have stuck to one machine, but sadly the first shop was unable to get a torque reading (couldnt find RPM signal). Smoothing was set at 5 or 6 for all runs.
5 is the max(on DJ's anyway), so if that's what you have, then you're good to go. Just make sure it's always set there in the future.
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      11-15-2011, 11:43 PM   #29
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Quote:
Originally Posted by dxb335d View Post
267 sounds too much WHP for stock. That would be close to 310-320 crank, which is far more than BMW quote.
He posted the baseline run was on the JBD at the minimum setting. That is not stock output. I don't believe he did any stock runs.

Mike
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      11-17-2011, 09:15 PM   #30
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Quote:
Originally Posted by YoKev View Post
You'll see at the top of your dyno sheet the word 'Smoothing', and it's setting can be anywhere between 1 and 5. What it is basically is how 'smooth' the plot lines are. A shady tech will set it at 1, because the plot(s) will be so erratic that it'll actually show an additional bogus hp or two.
YoKev, most of what you said is correct, but I'll explain a little more about the "smoothing" setting. First of all, the underlying data -- how fast the rollers spun up -- does not change. Smoothing just affects the graph of that data. Secondly, although you are right that lower smoothing settings will generally yield slightly higher peak numbers, that setting isn't shady or anything. It just looks more spiky, and to me we want to look at the larger trend of how the power is being delivered. But there might be times where a lower smoothing setting might be useful, like if you're trying to track down a momentary problem with power delivery.

For baseline dyno sessions, we offer to give our customers the raw dyno data, and the Dynojet software (WinPep) is free to download, so you can take the dyno data home with you and make your own graphs, setting the smoothing and correction factors however you want...

--Dan
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      02-11-2012, 10:31 AM   #31
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Where did you guys get the rpm signal from? I was supposed to go on a dyno jet yesterday but we couldn't find a signal. We tried the injectors too.
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      02-13-2012, 11:23 AM   #32
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anyone?
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      02-13-2012, 12:45 PM   #33
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Since you are planning to get the Evolve tune through VS, I would expect Paul@Evolve would be willing to help you with the info - especially since he has a 335d DD that is going to be the guinea pig for their development work.
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      02-13-2012, 05:58 PM   #34
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I really don't know how to read dyno charts. Does this mean the car is hitting max rear wheel torque of 463 ft lbs in fifth gear at approx. 2,250 rpms and max torque in fourth gear at approx. 2,500 rpms? If this is the case, will it make that kind of rwt at any point in first, second or third gear and if so what rpms?
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      02-13-2012, 10:02 PM   #35
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Quote:
Originally Posted by hammick View Post
I really don't know how to read dyno charts. Does this mean the car is hitting max rear wheel torque of 463 ft lbs in fifth gear at approx. 2,250 rpms and max torque in fourth gear at approx. 2,500 rpms?
Yes.

Quote:
If this is the case, will it make that kind of rwt at any point in first, second or third gear and if so what rpms?
It will probably make less torque in lower gears, because there is less time for exhaust pressure to build up behind the turbos. The lower gears will load the turbos less, and the torque peak will be higher in the RPM band as a result.

--Dan
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      02-14-2012, 09:44 PM   #36
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Quote:
Originally Posted by Mach V Dan View Post
Yes.


It will probably make less torque in lower gears, because there is less time for exhaust pressure to build up behind the turbos. The lower gears will load the turbos less, and the torque peak will be higher in the RPM band as a result.

--Dan
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Makes sense. Thanks.
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