[Osirisman]

Local performance shop had a dyno day.
Figured what heck I'm going to get some stock dyno numbers.
It was a hot day 92degrees.
Pretty happy with results.
Did 2 runs
First 303whp 344tq
Second 302whp 351tq

[uberbeast21]

Those are some impressive numbers on a 92 degree day

[Patronus86]

@Osirisman, 303 whp?!

That seems a bit high for a stock 335is. The stock horsepower is supposed to be around 320hp, but I know everyone says that BMW underrates their engines, so let's suppose a it really is 330hp. With a theoretical 20% power loss through the drivetrain, you're making at least 370 hp. Is my math right on that?

If the math is right, can someone explain to me how the 335is' stock engine can make horsepower that high?

[Osirisman]

Originally Posted by Patronus86

@Osirisman, 303 whp?!

That seems a bit high for a stock 335is. The stock horsepower is supposed to be around 320hp, but I know everyone says that BMW underrates their engines, so let's suppose a it really is 330hp. With a theoretical 20% power loss through the drivetrain, you're making at least 370 hp. Is my math right on that?

If the math is right, can someone explain to me how the 335is' stock engine can make horsepower that high?

I think the numbers are pretty legit.
There was another member here who dynoed at around 305.

There was a stock 2011 n55 335i which put down 281whp today as well.

[idrift4wd]

Originally Posted by Patronus86

@Osirisman, 303 whp?!

That seems a bit high for a stock 335is. The stock horsepower is supposed to be around 320hp, but I know everyone says that BMW underrates their engines, so let's suppose a it really is 330hp. With a theoretical 20% power loss through the drivetrain, you're making at least 370 hp. Is my math right on that?

If the math is right, can someone explain to me how the 335is' stock engine can make horsepower that high?

its very good numbers, but its more like a 12-15% loss. so on an engine dyno i would expect 340-350 on overboost. probably had some good fans lol.

[Patronus86]

Originally Posted by idrift4wd

its very good numbers, but its more like a 12-15% loss. so on an engine dyno i would expect 340-350 on overboost. probably had some good fans lol.

Yeah, but even at 15% loss, the engine is making at least 356hp, well above the theoretical 320hp. Maybe the fans help out a bit, but still, that's a high number for stock, isn't it?

[foghat]

Originally Posted by Patronus86

Yeah, but even at 15% loss, the engine is making at least 356hp, well above the theoretical 320hp. Maybe the fans help out a bit, but still, that's a high number for stock, isn't it?

Dynojets read fairly high when compared to some other dynos out there.

It is kind of hard do that sort of math. Right after he could have gone next door and done a run on a different dyno and only pulled 280whp.

[BQTuning]

Originally Posted by Patronus86

@Osirisman, 303 whp?!

That seems a bit high for a stock 335is. The stock horsepower is supposed to be around 320hp, but I know everyone says that BMW underrates their engines, so let's suppose a it really is 330hp. With a theoretical 20% power loss through the drivetrain, you're making at least 370 hp. Is my math right on that?

If the math is right, can someone explain to me how the 335is' stock engine can make horsepower that high?

I live in Florida also and my stock base was 303 whp and 333 wtq on RENNtech's dynojet that reads low. The similar numbers I got on a Mustang I got on RENNtech's dynojet. So the OP's dyno reading is correct and not over exagerated like most dynojest I have seen

The numbers are accurate for the sea level and DA we live in.

Please note: The 335is has overboost up to 7 second till 4500-5000 RPMs

[Jklad]

Originally Posted by Patronus86

@Osirisman, 303 whp?!

That seems a bit high for a stock 335is. The stock horsepower is supposed to be around 320hp, but I know everyone says that BMW underrates their engines, so let's suppose a it really is 330hp. With a theoretical 20% power loss through the drivetrain, you're making at least 370 hp. Is my math right on that?

If the math is right, can someone explain to me how the 335is' stock engine can make horsepower that high?

The IS cars have a 7 second overboost feature, I believe, which should explain this.

[junniior95]

Wow great numbers, i dynoed my stock e90 335i xdrive N55 on a mustang dyno and pulled 255whp 255tq....then got my Cobb protuned and pulled 301whp 365tq...again your twin turbo while im twin scroll, beautiful car man

[Patronus86]

Originally Posted by BuraQ

Please note: The 335is has overboost up to 7 second till 4500-5000 RPMs

Originally Posted by Jklad

The IS cars have a 7 second overboost feature, I believe, which should explain this.

Yeah, i'm familiar with the 7 sec overboost function, but I thought that only affected the torque.

[derryck]

That's just a very optimistic dyno...dyno numbers can vary greatly. It's a good baseline if future dynos will be on the same machine.

[Tiago@VRSF]

Looks like a healthy car, doesn't look to far off compared to other IS dynos I've seen on a dynojet.

[Jeff@TopGearSolutions]

Originally Posted by Patronus86

Yeah, i'm familiar with the 7 sec overboost function, but I thought that only affected the torque.

Increased boost would increase torque and HP as well.

[idrift4wd]

Dynojet number are pretty standard. If you want inflated number run your car on a dynapack (measures at the hub). Mustang dynos are the heart breakers.

[Spoolin1]

Originally Posted by BuraQ

I live in Florida also and my stock base was 303 whp and 333 wtq on RENNtech's dynojet that reads low. The similar numbers I got on a Mustang I got on RENNtech's dynojet. So the OP's dyno reading is correct and not over exagerated like most dynojest I have seen

The numbers are accurate for the sea level and DA we live in.

Please note: The 335is has overboost up to 7 second till 4500-5000 RPMs

Actually, Dynojets are the most accurate you can get on a chasis dyno due to the large drum (inertia) that has to be spun up. You can not manipulate a dynojet like you can a Mustang, Dyno Dynamics, etc., the numbers are what they are and are the closest you can get to real world (what it's putting down on the street).

[Ingeniator]

Originally Posted by idrift4wd

Dynojet number are pretty standard. If you want inflated number run your car on a dynapack (measures at the hub). Mustang dynos are the heart breakers.

Since this has turned into a dyno war. I'm sure some/most of you know the difference.

FYI for the rest Dynojet measures hp via acceleration of the rollers and calculates torque. Mustang measures torque via the energy required to resist the car and calculates the effective torque when factoring in vehicle weight and air resistance at 50mph.(If these numbers are off your dyno numbers can be high or low) then calculates HP from effective torque. The dynapack is another inertia dyno same as mustang but it eliminates the losses from tire/roller contact that occurs on both mustang/dynojet. The best dyno to tune on in my experience is an inertia dyno because you can do sustained pulls.

[Evooooo]

It's a dyno who cares what it reads. It is a tuning tool. Stop looking at the numbers and look at the curve, that is what matters. This back and forth dyno shit needs to just stop once and for all. All car enthusiasts know this so why do we always head down this path?

[mike@x-ph.com]

Nice