[wfoE90]

Decided to get my 335 dyno'd yesterday on a whim...and this was the result, needless to say, both the shop owner and I were completely stunned at the numbers.



As you can see....it was ~370 hp, 377 ft-lbs.

This is at the crank. Performance wise, my car ONLY has a BMW Performance exhaust. Stock tune, stock IC (as is very evident from the intake temps on the graph...), stock dp's.

The run was done on a Maha dyno. For those not familiar, this is bar-none the best dyno available. It is the brand of dyno used by BMW, Porsche and Audi at their factory and testing facilities. Each Maha dyno costs over $300,000.

Each Maha dyno accurately calculates drivetrain loss for each car on the dyno. After the run is completed...the operator places the car into neutral, and based on how much effort it takes to slow the wheels to a stop, it will calculate the drivetrain loss for your specific vehicle. It's very interesting to watch...when the car reaches the redline at the run, and the car goes into neutral, the drivetrain loss is calculated from redline down to idle as the rollers slow the wheels. The green line on the bottom is the drivetrain loss. As you can see, drivetrain loss varies based on vehicle speed/RPM. So when most people go on a DynoJet and the operator says "oh your car has about a 15% drivetrain loss on this dyno"...that is horribly inaccurate. Proof of how accurate a Maha is....this shop see's tons of stock E46 M3's and all day long they will dyno in the 331 -334 range...right on the money with what BMW says.

It can also do just wheel horsepower, and we did a run with just wheel horsepower, it was 302 whp, 341 ft-lbs. It is also important to note, that unlike a DynoJet or DynoDynamics, the operator has no control over correction factors. So numbers can't be artificially inflated. The only corrections it makes are standard SAE, DIN, ISO....etc corrections.

The shop owner has seen a ton of 335's, modded and stock, and he was blown away by my numbers. He begged me to let him take it around the block to see if his butt dyno corresponded to the actual dyno....needless to say it did! He got out of the car, and said "this car has to have some sort of tune on it!"

No tune!!!!! An interesting tidbit though...I just had the car into the dealer and got the most recent software update, maybe it's stronger than everyone thought!

[vgame64]

I was tempted to say

...but seriously, congrats! Add a tune, FMIC, and DPs if you want to be blown away further.

[JayKay335i]

Not to be a buzz kill but I'm going to call BS. Exhausts for these cars barely provide any HP. Maybe 5, 10 if your real lucky. Dyno #s are worthless or anything but comparisons and seeing how much power new mods give you. Plus, your im tempe, which means youre only on 91 octane.

[ToadHollow]

Nice man.

I used GoodSpeed for services on my 996 & an earlier Vette when living in Mesa & Chandler. They know their stuff, no doubt.

Start modding & then post the results.

[335e92tx]

what altitude you at I in AZ?


And you CANT get an ENGINE dyno number with the engine IN the car_ - nomatter how advanced it is

[RevC]

i have to call bs..

[CaptainDang]

Number seems high, but it has been suggested that the 335i is underrated at the factory, some suggest closer to 330-350hp at the flywheel.

Still, 370hp at the flywheel with an exhaust is a lot, sounds like a higher reading dyno.

[onesuperboi]

Wow. Are you sure there isn't a piggyback tune in your car? Sorry, I don't know if you bought it used or new...

BTW, could you tell us what was your drive train loss?

[john boxter]

thats awesome!!!!!

[bmwzimmer]

Only way this is possible is if you bought your car used from someone who had a tune and didn't tell you.

[wfoE90]

Originally Posted by JayKay335i

Not to be a buzz kill but I'm going to call BS. Exhausts for these cars barely provide any HP. Maybe 5, 10 if your real lucky. Dyno #s are worthless or anything but comparisons and seeing how much power new mods give you. Plus, your im tempe, which means youre only on 91 octane.

Yes, I agree with you completely that the numbers really don't mean much other than it is the highest stock tuned 335 that shop has seen...by far. And also, I'm not at all claiming the exhaust is the cause of the high numbers...I'm sure it does very little power wise....but damn does it sound amazing! No one can ever believe that its a BMW made exhaust.

Originally Posted by ToadHollow

Nice man.

I used GoodSpeed for services on my 996 & an earlier Vette when living in Mesa & Chandler. They know their stuff, no doubt.

Start modding & then post the results.

Yea, that was the first time I have been to GoodSpeed, but I know Jon back from the days when he worked at DynoComp. Was very impressed by the shop...they are in the process of making a full, enclosed dyno room/wind tunnel. Going to be amazing when finished!

Originally Posted by 335e92tx

what altitude you at I in AZ?


And you CANT get an ENGINE dyno number with the engine IN the car_ - nomatter how advanced it is

It's roughly 1,100 feet above sea level.

Yes, I know the only true way to get an engine dyno number is to take it out of the car and put it on an engine dyno. However, the unique way that the Maha can calculate drivetrain loss throughout the rev range puts it really damn close. There will always be those who doubt though.

Originally Posted by RevC

i have to call bs..

dude

Believe me, I wanted to call BS myself, but it is what it is. There is no way to "cheat" on this dyno.

Originally Posted by CaptainDang

Number seems high, but it has been suggested that the 335i is underrated at the factory, some suggest closer to 330-350hp at the flywheel.

Still, 370hp at the flywheel with an exhaust is a lot, sounds like a higher reading dyno.

Yea, I was astounded by the numbers myself, thinking that it might just read high. However, he was showing me other 335's they've done in the computer, and all were much lower, pretty much where you'd expect them to be. Thinking my car was definitely a "Wednesday Build"

Just out of curiosity sake, I'm going to get it on a DynoDynamics dyno next week for a comparison.

Originally Posted by onesuperboi

Wow. Are you sure there isn't a piggyback tune in your car? Sorry, I don't know if you bought it used or new...

BTW, could you tell us what was your drive train loss?

Haha, definitely no piggyback here. I hate piggybacks, they are a half-ass solution to proper tuning.

I purchased the car new. And have done no software/tunes/chips/piggybacks on it. I'm waiting for the BMW Performance software...which is part of the reason I went to the dyno, so I could get a baseline before the software.

Like I said though, I did have the dealer upload the most current ECU update...and it made the car drive wonderful. Much smoother than it ever was, and helped to eliminate a lag that I always felt was present.

The drivetrain loss is the green line at the bottom of the graph. It is drivetrain loss in horsepower. At peak hp, there is a 60.9 horsepower drivetrain loss. If you go near the redline on the graph, its in the 70's. If you want a percentage, just divide that into peak horsepower...which is roughly ~16% at peak horsepower.

[MeinBMW]

Why are you using the "Corrected Data"? The uncorrected numbers are 327 Crank and 266 WHP ... that seems like it's a lot closer to what it probably is ... There is no way you are making 70 Crank horsepower over what the car is rated with just an exhaust ...

Most dyno number out there seem to be DynoJet so I'd give it a run on one of those and see where you fall

[wfoE90]

Originally Posted by MeinBMW

Why are you using the "Corrected Data"? The uncorrected numbers are 327 Crank and 266 WHP ... that seems like it's a lot closer to what it probably is ... There is no way you are making 70 Crank horsepower over what the car is rated with just an exhaust ...

Most dyno number out there seem to be DynoJet so I'd give it a run on one of those and see where you fall

Because the "corrected data" is SAE corrected.

It is the North American standard for dyno correction. It takes into account atmospheric conditions and standardizes the numbers, so they can easily be compared no matter what the conditions are. It's not full proof...but there's a reason its called a standard.

Nearly every dyno will report SAE corrected numbers.

[Mr. 5]

I'd like to see the equation for the calculation of crank HP.
There's obviously an equation somewhere since it gets the power from the wheels and transfers it into crank numbers.
I'm not going to go as far as saying BS, but I will say that someone most likely made a mistake somewhere with the process.

[jaysonbmw]

^^+1

[enrita]

When i dinoed on the MAHA i got 260 rwhp stock tune with full bolt ons. Drivetrain loss was 55hp.

[bavarian19]

pics of exhaust?

[wfoE90]

Originally Posted by bavarian19

pics of exhaust?

from my iPhone, so not the best...but you can see it

[Alpina_B3_Lux]

Originally Posted by JayKay335i

Not to be a buzz kill but I'm going to call BS. Exhausts for these cars barely provide any HP. Maybe 5, 10 if your real lucky. Dyno #s are worthless or anything but comparisons and seeing how much power new mods give you. Plus, your im tempe, which means youre only on 91 octane.

Here's mine on a MaHa dyno of the same make. I got 399 hp with almost full bolt-ons (see my sig). Draw your own conclusions.



Alpina_B3_Lux

[MKE_M3]

Call me crazy, but here is a theory...

BMW's ECU is pretty smart. Perhaps it is adding boost to compensate for altitiude, and the other factors to run the normal 300-ish HP that it is designed to do, thus the uncorrected numbers the dyno has being right in line with what they should read, then the dyno "double" corrects the numbers.

In other words, the dyno says "if it were ideal operating conditions the car produce 360HP (or whatever) because right now, it is putting out 310HP (or whatever) in non ideal conditions" even though BMW's ECU already compensated for poor dyno conditions.

I hope this idea makes any sense at all?!?!?

[BrokenVert]

I just got my 135i back from the shop and got the latest N54 software. I also only have the BMW perf exhaust and I noticed the same things you did. My car pulls to redline now, as opposed to the power dropping off at around 6500 RPM like it did before. I also have noticed a power increase on my butt dino.

Anybody know of a good dino in NY so that we can compare numbers?


PS heres the link to my thread about this. The tech who did my software update said that he tailored the software around the fact that I had a perf exhaust.

http://www.1addicts.com/forums/showthread.php?t=315365

[MeinBMW]

Originally Posted by wfoE90

Because the "corrected data" is SAE corrected.

It is the North American standard for dyno correction. It takes into account atmospheric conditions and standardizes the numbers, so they can easily be compared no matter what the conditions are. It's not full proof...but there's a reason its called a standard.

Nearly every dyno will report SAE corrected numbers.

Yes I know this .. however the difference I've seen between corrected and uncorrected number is usually less than 10HP .. not 60