Stage 1 Aggressive Dyno - too aggressive for stock ?

[jjo213]

Hi,

my name is jens and i am a 335i coupe driver from germany. I just got my AP these days and did a dyno run today to see how much power stage 1 is. Here are the facts:

335i, manual shift, completely stock running Stage 1 Aggressive (93 octane) V3.01

http://imageshack.us/photo/my-images...iapstage1.jpg/

I think the torque is way too high for stock hardware, especially around 2.500rpm -> 580nm is 427 lb/ft

Is there any option / map which reduces this bump of torque around 2.500 rpm? From 3,5k til almost 5k the torque is around 400 lb/ft which is still very much...or should i just go back to sport map?

Thanks,
Jens

[Henry@COBB]

Hi,

my name is jens and i am a 335i coupe driver from germany. I just got my AP these days and did a dyno run today to see how much power stage 1 is. Here are the facts:

335i, manual shift, completely stock running Stage 1 Aggressive (93 octane) V3.01

http://imageshack.us/photo/my-images...iapstage1.jpg/

I think the torque is way too high for stock hardware, especially around 2.500rpm -> 580nm is 427 lb/ft

Is there any option / map which reduces this bump of torque around 2.500 rpm? From 3,5k til almost 5k the torque is around 400 lb/ft which is still very much...or should i just go back to sport map?

Thanks,
Jens

Hi, Jens,

Those numbers look about right. These motors are very stout from the factory and are more than capable of handling this tune. For those who would prefer to be more cautious, the sport and drive maps are perfect.

Let me know if I can answer any more of your questions!
-- Henry

[jjo213]

Yes you can :-)

Are there any maps that don´t have that bump of torque around 2,5 - 3 rpms and build up power smoother? I think that would make it more driveable

[Henry@COBB]

Yes you can :-)

Are there any maps that don´t have that bump of torque around 2,5 - 3 rpms and build up power smoother? I think that would make it more driveable

It sounds like the aggressive map is more intense than you want. Were you dissatisfied with the performance of the sport or drive maps? Are you using a linear throttle map or a stock throttle map?

Modulating the throttle differently may provide a preferable driving experience as well.

-- Henry

[jjo213]

Throttle response is okay form me, I´m lookling for a map with reduced boost around 2 - 3k rpms so that you don´t get that bump of torque

[Henry@COBB]

Throttle response is okay form me, I´m lookling for a map with reduced boost around 2 - 3k rpms so that you don´t get that bump of torque

I spoke with our tuners, and it seems that we do not have plans for developing a less aggressive version of the Aggressive Map. I think you will be satisfied with our Sport maps, but if you would like to pursue a pro-tune, one of our pro-tuners may be able to help tune your car to your specifications. Would you like me to point you to your nearest pro-tuner? Please send me a private message with your zip code, and I will respond with the nearest pro-tuner to you.

Alternatively, once we release AccessTUNER Race, you could try to adjust the load targets to reduce the boost pressure for your RPMs. Be sure to read the tuning guide, as it can give you more detailed instructions for doing so. It will also help you more fully understand your car and its tuning strategy.

-- Henry

[Ian1973]

Sorry guys for taking this off on a tangent, but I've been confused what exactly "stock" vs "linear" throttle maps mean?

Personally I love the torque the tune/motor builds on the 93 stage 1 aggressive map. Though I do know that Europe has much more stout fuel than the US, perhaps this is partially the reason for the bump in torque? Not that I would be complaining with 430 ft-lbs.

I own a 2009 335i coupe with 13k miles and have been running the 93 stage 1 aggressive maps since I bought the car 6000 miles ago. Great product.

The only thing I would mention is the throttle seems a bit indecisive or having a mind of it's own. I attributed to partial throttle, getting off the throttle for a millisecond and back, it's like the pressure the turbos produce doesn't have anywhere to go and the throttle plates(?) can't hold back the pressure. TO be honest I never put any miles on this car with the stock tune to know the difference.

[krim]

The stock throttle maps have untouched throttle mapping, meaning it is the same way that BMW programmed it from the factory. The stock throttle mapping is very aggressive and will give you full throttle position at relatively low pedal positions (sometimes as low as 40%).

The linear throttle maps are our version of throttle mapping. It is closer to a 1:1 ratio on the throttle position versus the pedal pedal position. This means at 30% pedal position you should see roughly 30% throttle position. It has more of the feel of an older drive-by-cable car with a mechanical throttle body.

One version is not faster than the other. Try them both to see which one fits your driving style better. In my opinion, here are the pros and cons of each.

Stock Throttle
Pros:
- It's what you are used to. The linear throttle mapping can "feel" different so some people interpret as bad.
- You don't have to push the gas pedal very far to make the car go fast, but keep in mind that even though the pedal is not being pushed far, the throttle blade is opening a disproportionally large amount.

Cons:
- Inconsistent and unpredictable power delivery. Since there is a big disconnect between the gas pedal and the throttle blade, it's hard to dial in the exact amount of power you want.

Linear throttle
Pros:
- Very predictable. If you want 50% throttle, push the gas pedal 50%. Done.
- Easier to modulate power.

Cons:
- Some people say it feels slower because you actually have to push the gas pedal to get the throttle to open and get into boost/power.

Here's a graph that will illustrate the differences as well. Let us know if you have any other specific questions about the throttle mapping.
N54 Throttle Mapping.jpg

Chris
COBB Tuning

[Ian1973]

Good post, thank you. I just moved over to the linear throttle yesterday, haven't driven it much to make a determination. I have used linear before, but not with the version 4.xx maps you now have.

Great product though.

[MarkAngelo]

Just came across this thread. I'm even more excited about receiving my COBB for our BMW. I have experience with COBB on the boosted RX8 platform tuning with ATR, but this is a totally new adventure with BMW.

I'm hoping to stay as stock as possible, with only a DCI. So I'm trying to figure out what MAP I can use to get the most power without getting an FMIC.

Thanks,
Mark

Good post, thank you. I just moved over to the linear throttle yesterday, haven't driven it much to make a determination. I have used linear before, but not with the version 4.xx maps you now have.

Great product though.