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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Stock-ish Dyno Sheet to be followed by more

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      08-01-2019, 05:57 PM   #1
Gepeto
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Stock-ish Dyno Sheet to be followed by more

Attached is the dyno sheet coming from a 2015 M235i with approximately 66,000KM (41,000 Miles).

5th gear pulls

Max HP is 290 and max torque is 338.

The car right now has no tune, only mods are an axle-back (Remus) and Active Autowerke charge pipe and intercooler, but without a tune (and in the case of the exhaust, even with) Iím sure those donít add any significant power.

In a few weeks I hope to post a sheet from the same car, with a Wagner downpipe and an intake, followed by the whole thing with bootmod3 OTS maps and maybe a custom tune.
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      08-02-2019, 06:49 AM   #2
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seems low, no?
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      08-02-2019, 10:09 AM   #3
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I don’t think so no? It was a super hot day, maybe I could’ve hit 295 in better conditions but on 91 octane, no tune, this is pretty much in line with what I’ve seen in the past. In any case, you can’t really compare different dynos so the goal is more to compare this baseline VS wagner catted + bootmod3 OTS and then bootmod3 custom tune.
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      08-02-2019, 10:39 AM   #4
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Nice OP!

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Originally Posted by delvec03 View Post
seems low, no?
Low compared to what? this is his baseline which he will be using for comparison.

You cant compare different dynos with different cars.
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      08-07-2019, 12:56 PM   #5
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In for updates
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      08-07-2019, 06:37 PM   #6
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Saw this on a google search. Subbed.
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      08-09-2019, 07:42 AM   #7
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Nice bro! Canít wait to see the results.
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      08-17-2019, 08:17 PM   #8
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Quote:
Originally Posted by mike@x-ph.com View Post
Nice OP!

Quote:
Originally Posted by delvec03 View Post
seems low, no?
Low compared to what? this is his baseline which he will be using for comparison.

You cant compare different dynos with different cars.
stock advertises 320 hp. bmw specs are usually low to begin with....I just expected more?
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      08-17-2019, 08:22 PM   #9
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Quote:
Originally Posted by delvec03 View Post
stock advertises 320 hp. bmw specs are usually low to begin with....I just expected more?
BMW rates the M235 at 320hp at the flywheel. Dynos measure power at the wheels. The M235s are underrated. They make closer to 360hp in stock form based on numerous dynos done over the years.
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      08-18-2019, 07:02 PM   #10
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I just did my FBO stage 2 93 BM3 OTS dyno. 342/384.
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      08-18-2019, 07:11 PM   #11
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Quote:
Originally Posted by XutvJet View Post
Quote:
Originally Posted by delvec03 View Post
stock advertises 320 hp. bmw specs are usually low to begin with....I just expected more?
BMW rates the M235 at 320hp at the flywheel. Dynos measure power at the wheels. The M235s are underrated. They make closer to 360hp in stock form based on numerous dynos done over the years.
exactly....so why is OP pulling 290?
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      Yesterday, 12:20 AM   #12
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Quote:
Originally Posted by delvec03 View Post
exactly....so why is OP pulling 290?
Every brand of dyno measures power a bit differently. The way to calculate flywheel power from measured wheel power (a dyno), you take the wheel power and divide .85 to .83 to account for drivetrain loss as the flywheel power gets a bit consumed by spinning the transmission, the driveshaft, differential, axles, wheels, and rotors.

So take 290 and divide by .83 (assuming an auto) and you get 350hp at the flywheel.
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      Yesterday, 09:43 PM   #13
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Quote:
Originally Posted by delvec03 View Post
stock advertises 320 hp. bmw specs are usually low to begin with....I just expected more?
Dynos are not meant to be used for absolute power. Some read high, others read low. The car makes the same power no matter what the dyno is showing.
Its used to compare delta between stock and once mods are installed
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      Today, 10:55 AM   #14
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Quote:
Originally Posted by mike@x-ph.com View Post
Dynos are not meant to be used for absolute power. Some read high, others read low. The car makes the same power no matter what the dyno is showing.
Its used to compare delta between stock and once mods are installed
I'll also note that Dynojets are by far the most consistent in terms of the way power is measured as it's such a simple power measuring device. It's simply a free spinning weighted drum, an RPM pickup on a coil pack, and a full throttle timed run. From there, the power numbers are calculated from how quickly the tires spin the drum over the time of the run. Crazy simple and repeatable.

They are not the best dynos for tuning as you can't vary load on the drum (i.e., Mustang dyno and the like), but when it comes to "the numbers" they are extremely consistent and within 2% to 3% of the same model car dynoed on a Dynojet in CA vs one dynoed on a Dynojet in NY assuming the same correction factor standards are used and the car is in a good state of tune and not super heat soaked.

It's also nearly impossible to manipulate the data on a Dynojet. You could make wild changes to the correction factors but it would be very obvious that you're doing that.

When it comes to companies showing power gains for mods, a Dynojet is the best tool for the job, IMO.

For tuning, a load-based, brake style dyno is the only way to go.
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      Today, 05:38 PM   #15
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Quote:
Originally Posted by XutvJet View Post
I'll also note that Dynojets are by far the most consistent in terms of the way power is measured as it's such a simple power measuring device. It's simply a free spinning weighted drum, an RPM pickup on a coil pack, and a full throttle timed run. From there, the power numbers are calculated from how quickly the tires spin the drum over the time of the run. Crazy simple and repeatable.

They are not the best dynos for tuning as you can't vary load on the drum (i.e., Mustang dyno and the like), but when it comes to "the numbers" they are extremely consistent and within 2% to 3% of the same model car dynoed on a Dynojet in CA vs one dynoed on a Dynojet in NY assuming the same correction factor standards are used and the car is in a good state of tune and not super heat soaked.

It's also nearly impossible to manipulate the data on a Dynojet. You could make wild changes to the correction factors but it would be very obvious that you're doing that.

When it comes to companies showing power gains for mods, a Dynojet is the best tool for the job, IMO.

For tuning, a load-based, brake style dyno is the only way to go.
Most newer dynojets have a load based drum I thought.
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