[OpenFlash]

Dyno'd our new 335i today. The dyno actually reads a bit low for a dynojet. Other dynojets in the area usually read 8-12whp higher. Regardless, the results were better than expected. Yes, the car is grossly under-rated from the factory.


All results were taken in 4th gear, btw. A 3rd gear pull made a few more ponies but the run was very short.

Best Regards,
Shiv
Vishnu Performance Systems

Results:

[Zeroday]

af is a little lean no?

[ase2dais]

thks thats helpful, now if someone can just post their e46M3 dyno
we'll be set!

[LWL]

Shiv, check your PM

[OpenFlash]

Originally Posted by Zeroday

af is a little lean no?

I think there is an airpump in the exhaust system somewhere that is contaminating the tail-pipe mounted wideband sensor. There's no way the factory would run it leaner than stock under boost. Plus, I've logged AFR just after the turbo (before any chance of airpump contamination) and things looked nice and rich under boost.

Shiv

[Zeroday]

Originally Posted by shiv@vishnu

Plus, I've logged AFR just after the turbo (before any chance of airpump contamination) and things looked nice and rich under boost.

Shiv

that says it all i guess. any timeframe on an ecu from you guys?

[OpenFlash]

Originally Posted by Zeroday

that says it all i guess. any timeframe on an ecu from you guys?

I'm not too crazy about offering an ECU upgrading on a brand new car with a 5 year warranty and free servicing. There is waay too much stored info on this car (in the keyfob, in the ecu, etc,.) to risk having your warranty voided for abnormal logged engine data (extra boost, higher rev limits, etc,.) And that is even if you get your ecu flashed back to stock. We're looking at other, more riskless, means to get the job done.

-shiv

[E90Boy]

Nice, I rather spend some extra money towards the 335i than the fake reflash gains for my 325i.

[fibercus]

Spacers and springs and im calling it done. gaps in the wheel well bug me - i like em tight.

[picus]

This post makes me very happy.

[noro]

Did you say it was in 4th gear??? Isn't the 5th one with 1:1 ratio? Of course you gonna get results like that.

[John]

great results man, this car is a beast. can't wait to start seeing some modd'd 335's

[GAaaAR]

+1 For the most accurate reading the car should be dynoed at 5th gear since its 1:1 ratio. Although the results are still pretty good even for a 4th gear dyno.

[ska///235i]

Now we're talking.......

this thing is fast

[Shinobi]

Originally Posted by shiv@vishnu

Dyno'd our new 335i today. The dyno actually reads a bit low for a dynojet. Other dynojets in the area usually read 8-12whp higher. Regardless, the results were better than expected. Yes, the car is grossly under-rated from the factory.

Best Regards,
Shiv
Vishnu Performance Systems

Cool . Its good to see a second dyno validate the numbers that Automobile mag posted. Could you possibly dyno an e90 330i if you have one handy, to compare the drivetrain loss? Automobile mag used 20%, but I was very disappointed when I found out how that number was actually determined, among other things. On e46s, the drivetrain loss was 12-15% vs. manufacturer stated numbers...based on dynos I've observed.

Wow, those are amazing numbers for a non-M stock 3-series. The next few years will be very interesting for this car. By then, I might trade-up.

[Jason]

Thanks for sharing the results. And welcome to the site.

[OpenFlash]

Originally Posted by noro

Did you say it was in 4th gear??? Isn't the 5th one with 1:1 ratio? Of course you gonna get results like that.

The "golden rule" of dyno testing a car in its 1:1 gear doesn't really apply to most long legged cars these days. Dyno this car in 5th gear, for instance, would have wheel and dyno rollers speeds well above 150mph. In 4th, the wheel speeds were already 140mph which is actually a bit higher than I'd prefer. Usually, we pick a gear that would keep wheelspeeds below 120mph. Above that, frictional losses get a bit out of hand and the shape of the power curve gets distorted (falls off) at high rpm. Conversely, too low of a gear and a good chunk of the power is being used to distort the tire sidewall (think drag slicks during a launch) instead of spinning the rollers. The key when dyno testing a car is to keep wheel speeds in their "sweet spot" where no loss component (frictional, thermal, inertial, windage, etc,.) is too excessive.

Regards,
shiv

[OpenFlash]

Originally Posted by Shinobi

Cool . Its good to see a second dyno validate the numbers that Automobile mag posted. Could you possibly dyno an e90 330i if you have one handy, to compare the drivetrain loss? Automobile mag used 20%, but I was very disappointed when I found out how that number was actually determined, among other things. On e46s, the drivetrain loss was 12-15% vs. manufacturer stated numbers...based on dynos I've observed.

Wow, those are amazing numbers for a non-M stock 3-series. The next few years will be very interesting for this car. By then, I might trade-up.

Unfortunately, driveline loss can't be expressed as a static % loss. Driveline losses are a funny thing. There are many different loss components (as mentioned in my previous post). Some are fixed (insensitive to power output) and some are variable (increase as power increases). If we keep power output with a reasonably small range (say 200-300whp), thinking of drivetrain loss as a fixed number (ie. say 55whp) is going to be more accurate than thinking of it as a factor (% of total power). This approach is even more realistic since the 330 and 335 share basic drivetrain components (apart from wheels, rotors, etc,.) The loss components that are power output sensitive aren't going to be *too* different among the two cars.

So if a 255bhp 330 were to dyno at 200whp, we'd conclude that the dyno results suggest a 55whp driveline loss. This, of course, assumes that BMW was accurate in how it rated the 330.

So we can, albeit somewhat conservatively, assume that the 335i also has ~55whp driveline loss when tested in similar conditions, on the same dyno. In this case, we'd get 278+55 for a grand total of 333bhp. Not too shabby and heaps more realistic that the 350+bhp that Automobile mag claimed when they assumed the ever-popular 20% driveline loss approach

Cheers,
shiv
Vishnu Performance Systems

[Shinobi]

Originally Posted by shiv@vishnu

Unfortunately, driveline loss can't be expressed as a static % loss. Driveline losses are a funny thing. There are many different loss components (as mentioned in my previous post). Some are fixed (insensitive to power output) and some are variable (increase as power increases). If we keep power output with a reasonably small range (say 200-300whp), thinking of drivetrain loss as a fixed number (ie. say 55whp) is going to be more accurate than thinking of it as a factor (% of total power). This approach is even more realistic since the 330 and 335 share basic drivetrain components (apart from wheels, rotors, etc,.) The loss components that are power output sensitive aren't going to be *too* different among the two cars.

So if a 255bhp 330 were to dyno at 200whp, we'd conclude that the dyno results suggest a 55whp driveline loss. This, of course, assumes that BMW was accurate in how it rated the 330.

So we can, albeit somewhat conservatively, assume that the 335i also has ~55whp driveline loss when tested in similar conditions, on the same dyno. In this case, we'd get 278+55 for a grand total of 333bhp. Not too shabby and heaps more realistic that the 350+bhp that Automobile mag claimed when they assumed the ever-popular 20% driveline loss approach

Cheers,
shiv
Vishnu Performance Systems

Very interesting...thank you for the info. I'd still like to see a dyno of an e90 330i on the same machine in similar conditions to compare. I would expect the 330i to put down more than 200HP at the wheels.

[OpenFlash]

Originally Posted by Shinobi

I would expect the 330i to put down more than 200HP at the wheels.

So would I. But magazines never print inaccurate info, right

Shiv

[07-335i]

wow i didnt understand that chart!!! so would you just throw up the numbers (hp) please???

[arcrox]

Originally Posted by 07-335i

wow i didnt understand that chart!!! so would you just throw up the numbers (hp) please???

They're at the top of the graph...