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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Just Dynoed stock LCI 335I.. 302WHP 336WTQ



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      07-21-2009, 06:19 PM   #45
MACH V
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Maybe he really did dyno those numbers stock, not all 335i are the same. I dynod 287rwhp stock... Nice numbers!!!
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      07-21-2009, 06:27 PM   #46
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Quote:
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Maybe he really did dyno those numbers stock, not all dynos are the same. I dynod 287rwhp stock... Nice numbers!!!
fixed
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      07-21-2009, 06:29 PM   #47
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Quote:
Originally Posted by Tortfeasor 335xi View Post
Those numbers are bogus. You make peak torque at 3100 rpm which is right before your HP line crosses it. HP is actually calculated: HP = (Tqe x RPM) / 5250. Which means that when you get to 5250 rpm TQE has to equal HP mathematically. In your case, the graph does not cross at 5250, but around 3500 rpm. Thus some sort of bogus correction factor was used bumping power up a high enough percentage to push the graph intersection all the way back to 3500 RPM.
If you take into account that the scales on the left and right are different, HP and Torque are both 300 at 5250...
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      07-21-2009, 08:56 PM   #48
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Quote:
Originally Posted by Tortfeasor 335xi View Post
Those numbers are bogus. You make peak torque at 3100 rpm which is right before your HP line crosses it. HP is actually calculated: HP = (Tqe x RPM) / 5250. Which means that when you get to 5250 rpm TQE has to equal HP mathematically. In your case, the graph does not cross at 5250, but around 3500 rpm. Thus some sort of bogus correction factor was used bumping power up a high enough percentage to push the graph intersection all the way back to 3500 RPM.
for someone that knows this much,why cant you understand that these curves would meet at the 5250 mark if they were scaled the same?
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      07-21-2009, 10:03 PM   #49
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Here's my 'guess'... these either are the 'corrected' numbers... or their not SAE and the 'altitude' is above say 4,000 feet or so.

In other words... since Turbo cars add their own air... they can dyno significantly higher at altitude after correction factor then a non-turbo would... since the correction factor is 'assuming' power should be lmiited at the high elevation.

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      07-22-2009, 03:33 AM   #50
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Would like to see what another stock 335i puts down on the same dyno.
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      07-22-2009, 04:27 AM   #51
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What was the ambient temperature? My guess for these numbers, at most 40 degrees F..
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      07-22-2009, 05:39 AM   #52
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Quote:
Originally Posted by xPaulBaiLeyx View Post
There is no way you're at 302WHP stock.
That is what you're at the crank, not the wheels.
If you're at 302 stock and the wheels then you're at like 350 crank stock. . .
Which is ridiculous!

Edit: And now looking at your dyno chat, it says 302.6HP not WHP.
And if i recall correctly, it should say WHP or RWHP.
+1. Come on you can see clearly the dyno graph! It reads Hp and it is Crank. If it was on the wheels it would have read Whp or Rwhp!!!
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      07-22-2009, 09:23 AM   #53
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even if its crank readings, isnt the torque still too high?
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      07-22-2009, 10:21 AM   #54
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Maybe he got his car with a JB+ or some mild tune pre-installed
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      07-22-2009, 10:31 AM   #55
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Maybe he got his car with a JB+ or some mild tune pre-installed
HOW? He's advertising it's stock... Unless BMW installed it's soon to be released performance pkg into his new car... But i doubt that's the case...
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      07-22-2009, 10:53 AM   #56
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Quote:
Originally Posted by chiefsotos View Post
+1. Come on you can see clearly the dyno graph! It reads Hp and it is Crank. If it was on the wheels it would have read Whp or Rwhp!!!
The dyno is rwhp, unless the shop is messing with me. Not all graphs show a w for wheel hp.
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      07-22-2009, 10:55 AM   #57
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Quote:
Originally Posted by Malaka1 View Post
What was the ambient temperature? My guess for these numbers, at most 40 degrees F..
Low 50's.
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      07-22-2009, 11:30 AM   #58
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Quote:
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I intend to take the car down the track at some point in the next two weeks to see what sort of numbers I am getting, and we will see if these hp numbers are accurate or way of depending on my ET's

When comparing dyno'd hp results vs. track results, shouldn't you be more concearned with your trap speed rather than your ET? Trap speed is the indicator of actual output of power.
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      07-22-2009, 11:35 AM   #59
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When comparing dyno'd hp results vs. track results, shouldn't you be more concearned with your trap speed rather than your ET? Trap speed is the indicator of actual output of power.
Of course, but at the same time when I wrote that I didn't think someone would pick it apart and dissect what I said.
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      07-23-2009, 12:03 AM   #60
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lol

calm down guys

it doesnt matter if this dyno was calibrated to show his car putting down 900whp. If no other stock 335's are being dyno'd on it then its probably just a high reading dyno.

The OP said all he wants is a baseline for future mods, which is great! As long as he keeps using this dyno and not switching around, then all is good.

Enjoy your car OP, but dont go around racing a jb+ car thinking you'll be neck and neck.
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      07-23-2009, 01:21 PM   #61
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What teh fuh
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      07-23-2009, 01:24 PM   #62
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This might explain why I've done well against a 550i...
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      07-23-2009, 02:31 PM   #63
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Its a LCI. Maybe BMW turned up the boost a tad?
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      07-23-2009, 02:34 PM   #64
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Its a LCI. Maybe BMW turned up the boost a tad?
Obviously not, otherwise they would not be selling the Performance package for 2000 EUR.

I got an E90 LCI myself and had a dyno baseline of quite exactly 305 hp (crank). I would only trust a MaHa dyno (the same that BMW uses themselves), the rest is not accurate enough. My guess would also be someone confused power at crank and at the wheels.

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      07-23-2009, 02:49 PM   #65
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Quote:
Originally Posted by Alpina_B3_Lux View Post
Obviously not, otherwise they would not be selling the Performance package for 2000 EUR.

I got an E90 LCI myself and had a dyno baseline of quite exactly 305 hp (crank). I would only trust a MaHa dyno (the same that BMW uses themselves), the rest is not accurate enough. My guess would also be someone confused power at crank and at the wheels.

Alpina_B3_Lux
I'm not talking about a 4-5psi increase, but a very slight one. That or the more likely reason is the dyno is just reading high.
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      07-24-2009, 12:01 AM   #66
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Quote:
Originally Posted by SCCAForums.com View Post
Here's my 'guess'... these either are the 'corrected' numbers... or their not SAE and the 'altitude' is above say 4,000 feet or so.

In other words... since Turbo cars add their own air... they can dyno significantly higher at altitude after correction factor then a non-turbo would... since the correction factor is 'assuming' power should be lmiited at the high elevation.

Dave
Ummm, turbo's don't/can't "add" air.
They can only compress what's available.
They don't magically create, add, or produce air.
They can compress available air so that more air can be pushed into the combustion chamber at greater than atmosphere, vs a NA engine that can only rely on atmosphere and the vacuum created in the combustion chamber.

If that is what you meant, then your wording is odd.
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