[edo]

Hi,

dynoed my car two days ago.

My mods are in my signature.
Pump gas - 98 RON (93-94 AKI), +14 degress Celcius.
8-17 maps, firware 28. Autotuned settings (max boost - 16.8 psi, but just @ 4.5-5.1k rpm, most of the time - 14-16 PSI).

The first run -385whp (440 crank), 570Nm. I was a bit dissapointed with the torque. I was also expecting ~395-400+ whp, but it wasn't too bad.



Then a friend of mine dynoed his E92 M3 with an aftermarket drop in air filter and catless aftermarket exhaust. His results - 330whp (370 crank). He couldn't believe that was true. Then I realized our cars were dynoed in 4th gear, but the 5th gear is a direct one. So we redynoed our cars.

Results of the second run - 439whp (495 crank), 670Nm. This time I was satisfied with the numbers, but the torque graph looks weird though:



Does anyone know what the pump gas power record was so far?

I was logging the runs, but I don't know (and couldn't find any documentation on Vishnu forum, Shiv didn't answer my question) what debug byte, debug word and other stupid channel names mean.

The M3 put down 340whp (385 crank), 370Nm.

And now some questions:
1) Why oh why my dyno graphs look like a big single turbo car's? Almost all the graphs that I've seen before look different - max torque is reached much earlier. And what's up with that dip between 3 and 3.5k rpm? Could it be due to wheel slippage?
2) How come despite the huge difference in power my car is just a little bit faster than the M3 (almost neck and neck)? Could it be because of my big, wide and heavy wheels?

Thanks in advance for your thoughts.

And here are some pics from the evening:

[UltimateLurker]

Nice "Numbers" but what makes you think your bolt on 335i is faster than the hundreds of others with the same parts? A dyno operator can manipulate numbers to read whatever makes you happy, but what does it really mean? Run a 1/4 and lets see your trap speeds.

[edo]

Originally Posted by UltimateLurker

Nice "Numbers" but what makes you think your bolt on 335i is faster than the hundreds of others with the same parts? A dyno operator can manipulate numbers to read whatever makes you happy, but what does it really mean? Run a 1/4 and lets see your trap speeds.

LOL.
Well, he didn't manipulate anything as there were at least 8 other cars whose numbers were +- OK.
And where did I say my car was faster than others? I didn't.
I don't care about stupid 1/4 runs. 100-200 km/h or 60-130 mph times represent much more. Buy a Vbox.

[jblackwell]

Originally Posted by edo

100-200 km/h or 60-130 mph times represent much more. Buy a Vbox.

+1. I love the vbox.

[dzenno]

Vbox ftw!

[klipseracer]

Those dynos read high. :P

[Mike@N54Tuning.com]

If you convert your Torque to North American Torque numbers you are getting a peak torque of 500 ft.lb which is very high. Do you have a baseline dyno you can post up?

Mike

[R1000K3]

The engine power (and wheel power) is the same on all gears minus differences such as the tyres may spin on the dyno drum on low gears, or cause high IAT on high gears when more time is needed for a sweep.

It is better to present wheel figures, which is what the dyno measures than speculate in crank power. A lot more come into play in real life as well. I huge mobil home with a N54 engine would present the same figures on a dyno as a 355i but may be a bit slower from 100-250 km/h just to give en example.

If you really want to know how a change of the car effects the performance it is more reliable to use a Vbox. Dyno runs are better suited for development (or bragging) than telling the actual difference between 335 individuals.

Nice pictures

[BrianMN]

So nobody else thinks its very strange he dymoed in 5th gear? In the States, 4th is our 1:1, And not sure why gearing would change for different countries if that's what's being implied?? The first run in 4th gear looks to be more accurate numbers. That dyno curve looks a bit abnormal too

[JayKay335i]

Means nothing without a base line on the same dyno.

[R1000K3]

Originally Posted by BrianMN

So nobody else thinks its very strange he dymoed in 5th gear? In the States, 4th is our 1:1, And not sure why gearing would change for different countries if that's what's being implied?? The first run in 4th gear looks to be more accurate numbers. That dyno curve looks a bit abnormal too

+1

And it is not terribly convincing the maximum power is higher on 5th gear vs. 4th. In case this is shown I would suspect the operator changed the calibration on purpose or indirectly by making a fault. At least it shows he may not know how the engine works and dyno operates.

[cstmx_ryder]

I call BS......No offense

[hun77777]

before we say anything, did u only have 2 runs? if 1st one is 385whp, 2nd is 440whp, then wouldn't u want to dyno couple more times just to make sure calibration is set right for that run? never had the dyno you were on (dynamometers?) personally so i can't comment on that...

[edo]

Originally Posted by klipseracer

Those dynos read high. :P

Oh really? How do you know without seeing the baseline runs?

Originally Posted by Mike@N54Tuning.com

If you convert your Torque to North American Torque numbers you are getting a peak torque of 500 ft.lb which is very high. Do you have a baseline dyno you can post up?

Mike

Yes, I do. Here's a beseline run on the same dyno 2 years ago (280 whp, 319 crank, 401 Nm):



And here's a baseline dyno run from another dynamometer (262whp, 328 crank, 450 Nm), but it operates on another principle:

Originally Posted by maxnix

Also, 100 KM/h - 200 KM/h = 62.5 mph - 125 mph

I can't quite get why you wrote this. Could you elaborate?

Originally Posted by R1000K3

If you really want to know how a change of the car effects the performance it is more reliable to use a Vbox. Dyno runs are better suited for development (or bragging) than telling the actual difference between 335 individuals.

I have a Pbox (Performance box), but I don't know how much exactly my car weighs. I'm planning to weigh it in a week or so.

Originally Posted by R1000K3

Nice pictures

Thanks, photography is one of my many hobbies

[edo]

Originally Posted by BrianMN

So nobody else thinks its very strange he dymoed in 5th gear? In the States, 4th is our 1:1, And not sure why gearing would change for different countries if that's what's being implied?? The first run in 4th gear looks to be more accurate numbers.

Originally Posted by R1000K3

1

Take another guess. USDM 335i specs:

Originally Posted by R1000K3

In case this is shown I would suspect the operator changed the calibration on purpose or indirectly by making a fault. At least it shows he may not know how the engine works and dyno operates.

Sorry, but this "conspiracy" BS is just laughable. How and why in the world he could/would change calibration just for me? Sorry, but your post shows you don't know anything. The operator (and owner) of the dyno has made at least 1000 dyno runs, tuned hundreds of cars and he doesn't know how an engine or dyno works.

[edo]

Originally Posted by cstmx_ryder

I call BS......No offense

I call your post rubbish. No offense.
Why so many haters and non-believers? Why would I/operator of the dyno lie?

Please, post just if you have something valuable to say.

Originally Posted by hun77777

before we say anything, did u only have 2 runs? if 1st one is 385whp, 2nd is 440whp, then wouldn't u want to dyno couple more times just to make sure calibration is set right for that run? never had the dyno you were on (dynamometers?) personally so i can't comment on that...

First of all, do you understand that different gears were used? The M3 also made more power on the 5th gear run. Secondly, we have to pay for each run. Thirdly, they were closing their shop. I'll upload a video (I have to edit it) from the evening and you'll see it was already dark when my last run was done.
I'm definitely going to dyno my car shortly, but on another dyno.

[edo]

Still waiting for your thoughts on these questions:

Originally Posted by edo

And now some questions:
1) Why oh why my dyno graphs look like a big single turbo car's? Almost all the graphs that I've seen before look different - max torque is reached much earlier. And what's up with that dip between 3 and 3.5k rpm? Could it be due to wheel slippage?
2) How come despite the huge difference in power my car is just a little bit faster than the M3 (almost neck and neck)? Could it be because of my big, wide and heavy wheels?

I believe the M3 is lighter (hope to find that out soon), but this doesn't explain similar performance in a straight line. I will also try to change the wheels and do some Pbox runs as my whells (Iforged Emotion) are really heavy.

[R1000K3]

Originally Posted by edo

Sorry, but this "conspiracy" BS is just laughable. How and why in the world he could/would change calibration just for me? Sorry, but your post shows you don't know anything. The operator (and owner) of the dyno has made at least 1000 dyno runs, tuned hundreds of cars and he doesn't know how an engine or dyno works.

You are probably right and no need to feel sorry. I don't understand anything about why it is expected that the power should increase on 5th gear, in this case a difference of 55 whp between 4th and 5th gear. Why is the engine putting more power on 5th gear? Especially since the torque on the rear wheel is lower on 5th gear? I'm eager to learn

[themyst]

Plus there's no baseline.

[edo]

Originally Posted by themyst

Plus there's no baseline.

Are you blind?

[edo]

Originally Posted by R1000K3

You are probably right and no need to feel sorry. I don't understand anything about why it is expected that the power should increase on 5th gear, in this case a difference of 55 whp between 4th and 5th gear. Why is the engine putting more power on 5th gear? Especially since the torque on the rear wheel is lower on 5th gear? I'm eager to learn

Well, I'm not a mechanic, but as far as I understand everything works like this:
The engine is putting the same amount of power in each gear, BUT you don't connect dynamometer directly to engine, right? Power is measured to the wheels and engine power goes to the wheels through transmission, right? That is why the most accurate results are acheived when dynoing a car in a gear which is the closest to 1:1. In our case the 5th gear is a direct one.

[enrita]

if you do pull with the M3 50-200 you should get at least 5 cars . What are your 100-200 times?
I must say that your highest figures are really a bit too high. The first pull 385 whp should be more aligned with the mods you have.