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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 > Dyno'd!? V2.02 2-26-08 + UR Catback



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      04-01-2008, 08:45 PM   #45
shiv@vishnu
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Both Mustang Dynos and Dyno Dynamic dynos, calibrated as per the manufacturer will read ~15% less than Dynojet dynos under similar conditions. But both Mustang and DD dynos can be adjusted, by the user, to read higher or lower. Sometimes they are adjusted to read high so that customers don't freak out when their numbers are lower than their misinformed expectations. But often, they are not. This is why you need to see a baseline run before you can come to any conclusion. If the baseline run is 240whp, then the Mustang/DD dyno is set up to read accurately (as per the manufacturer). If the stock baseline reads 275whp, then we know that it's been fiddled with to read like a Dynojet. Regardless of calibration, the importance is the % delta between stock and tuned (just like garygaryh said).

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      04-01-2008, 08:46 PM   #46
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Quote:
Originally Posted by Mr. 5 View Post
I'll take your word for it, but statisticaly speaking, the numbers shouldn't be that different.

Do mustang dynos have SAE or STD correction factors?
If so, did the OP use these factors?
If so, then the elevation should have no affect on this dyno then.
Shouldn't elevation still affect it though because of the N54s 0.2 bar overboost feature for elevation? Or does the PROcede disable that?

I know this is why some guys stock dynos at higher elevations looked grossly overrated when they used correction factors.
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      04-01-2008, 08:49 PM   #47
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Elevation will always effect power to a degree. Corrections factors will always attempt to correct for the power loss. Usually, it will fail miserably in doing so unless your particular car follows the model the correction was based upon (which is unlikely). In the end, you compare stock vs tuned, same dyno, same day. If that is not possible, comparing the results to a reasonably large sample of other stock cars is always helpful.

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      04-01-2008, 09:06 PM   #48
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Originally Posted by Bubbles View Post
Mustang Dynos are frowned upon in these parts.
OP are you happy with the power from the mods?
Yea, the numbers were a little shocking, but after researching and reading a lot of comments on this thread I feel a lot better about them.

I wish that I had dyno'd my car before the exhaust, and chip so that I could have a good base line to compare. They specifically told me that these numbers would be a more realistic projection of what my car actually puts down during everyday street use and that DynoJets are more just for higher numbers and aren't accurate for tuning. I don't know enough about dynos to know weather or not that statement is true, but either way it seems the numbers are good.

But I don't need dyno numbers to tell me that the modifications are doing their job. The car feels amazing!

-Adam
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      04-01-2008, 10:41 PM   #49
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I am at ~3500ft and had to make adjustments well beyond the preset 90% TQ settings to maintain good boost levels above 4500rpm. I suggest that you do some data logging, increase the TQ settings (boost) and head back to the dyno


Quote:
Not super happy with the numbers. But I guess Mustang + Altitude = Lower Numbers??

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Ultimate Racing Catback (Secondary Cat Delete)
91 Octane
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      04-02-2008, 03:03 AM   #50
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Quote:
Originally Posted by Park2670 View Post
Because according to your philosophy my car is much faster up here than at sea level because of air density.
No. I said:

Quote:
Originally Posted by Lane View Post
Our cars are not affected by the elevation as much as NA cars, because DME increases the boost at elevation. Also the thin air means less drag.
DME increasing the boost compensates somewhat the power loss at the elevation meaning that our cars have relatively little of power loss in comparison. My post was a reply to a post from which you could have understood that our cars (especially) would suffer by the elevation.

Now, I also said that thin air means less drag. From that fact you cannot derive a generalisation that it would mean "car being much faster at elevation". Obviously 0-60mph your car is slower at elevation, but when the drag plays a higher role at higher speeds its a different story. Also the turbos are able to compensate to a certain limit after which point the drop in power for each 1000ft of elevation, will be a lot more. The power of 335i as a function of elevation is a kinked curve. So you cannot generalize because it depends on the velocity of the car and the elevation. Neither function is linear as Leftcostman explained already.

However, as a generalization of the performance at the elevation you could say that at lower speeds your car is slower. At high speed your car is fast. And in relative terms when compared to NA cars, your car is really fast. M&M has been able to humiliate some supercars as far as I remember.
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      04-02-2008, 03:14 AM   #51
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the only way to see the REAL difference is same dyno, same day. stock vs after mods
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      04-02-2008, 03:18 AM   #52
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the only way to see the REAL difference is same dyno, same day. stock vs after mods
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      04-02-2008, 10:41 AM   #53
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Well I was checking out Cobb website and, while it's not totally relevant, checked out their Dyno graphs for the new STi. Made me feel a even better that with my two mods I am quicker than their stage 2 setup on a car that has the same HP. (according to their graph a stock STi makes 230ish BHP?)

http://www.cobbtuning.com/products/?id=3750
(assuming they are using their same dyno for their results)
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      04-02-2008, 10:54 AM   #54
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how do you explain one of the member's signatures indicating mustang dyno of 331 rwhp with Dinan tune only. that would tranlate to ~430 bhp or ~365 rwhp according to the earlier posts. (dinan reports 384 bhp).
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      04-02-2008, 10:56 AM   #55
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as previously mentioned.. the dynos can be calibrated to show higher numbers. You can't compare different dynos. the only thing you can do is compare your own baseline on the same dyno.

Quote:
Originally Posted by tomtom View Post
how do you explain one of the member's signatures indicating mustang dyno of 331 rwhp with Dinan tune only. that would tranlate to ~430 bhp or ~365 rwhp according to the earlier posts. (dinan reports 384 bhp).
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      04-02-2008, 12:11 PM   #56
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Quote:
Originally Posted by adrock View Post
Yea, the numbers were a little shocking, but after researching and reading a lot of comments on this thread I feel a lot better about them.

I wish that I had dyno'd my car before the exhaust, and chip so that I could have a good base line to compare. They specifically told me that these numbers would be a more realistic projection of what my car actually puts down during everyday street use and that DynoJets are more just for higher numbers and aren't accurate for tuning. I don't know enough about dynos to know weather or not that statement is true, but either way it seems the numbers are good.

But I don't need dyno numbers to tell me that the modifications are doing their job. The car feels amazing!

-Adam
Well, that's all that matters.

Quote:
Originally Posted by tomtom View Post
how do you explain one of the member's signatures indicating mustang dyno of 331 rwhp with Dinan tune only. that would tranlate to ~430 bhp or ~365 rwhp according to the earlier posts. (dinan reports 384 bhp).
It doesn't make sense to me, but I didn't dyno in California, therefore it likely my figures are grossly inaccurate

I don't think anyone here can say with any sort of accuracy what the OP is actually putting down on the dyno.
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      04-02-2008, 12:18 PM   #57
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the only true test is put a bunch of different 335's with different tunes on the same dyno on the same day. that would be fun
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      04-02-2008, 12:29 PM   #58
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the only true test is put a bunch of different 335's with different tunes on the same dyno on the same day. that would be fun
Park! You want to volunteer?
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      04-02-2008, 12:31 PM   #59
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I'll set one up in CT want to drive down?
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      04-02-2008, 01:41 PM   #60
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15% is definetly on the high side. 12% is probably more the norm.

Being off by 200 pounds on the car weight can make a big difference in a mustang dynos numbers.

Not bad numbers for the altitude and being a mustang dyno
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      04-02-2008, 07:16 PM   #61
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im down for the next dyno day. Can see what a stock car does
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      04-02-2008, 07:57 PM   #62
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have any before-v2 dynos? no delta no care.
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      04-02-2008, 08:43 PM   #63
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if a tuned 335 makes 300 hp on a dyno but then runs a mid-12 second quarter mile does it still make a sound?
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      04-02-2008, 09:05 PM   #64
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Quote:
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if a tuned 335 makes 300 hp on a dyno but then runs a mid-12 second quarter mile does it still make a sound?
what? lol
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      04-02-2008, 10:09 PM   #65
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Quote:
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if a tuned 335 makes 300 hp on a dyno but then runs a mid-12 second quarter mile does it still make a sound?
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      04-02-2008, 10:28 PM   #66
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Wow, there's some huge misconception going on here.

For those of you who merely look at dyno numbers,

Dynomometer is a tuning tool. Depending on the type of dyno, correction factor used, ambient air temp, altitude and various other factors, it can yield different numbers.

Your 1/4mile trap speed will tell you how much power you're putting down.

To Mr.5,

You don't suffer from more drivetrain loss because mustang dyno is giving you lower reading

Mustang dyno is load based dyno and typically gives lower reading than dynojet. Dynodynamics dyno reads similar to mustang or slightly lower.

Here's an example.

My older set up gave me 360whp on dynojet.
Without any change and at similar temp, it dynoed 308whp on mustang dyno.

Just because I had 308whp on mustang dyno doesn't mean I'm making less power than I did at dynojet. It just means it reads lower.

I think the majority of members on this board need alot of catch up reading to do!
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