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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 06-06-2014, 01:11 PM
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rdkind62 rdkind62 is online now
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Just go the car off the dyno machine

So, I put a Cobb tune on my car last weekend and had the chance to take it to a dyno shop here in Colorado Springs this morning. I didn't do a baseline prior to putting the tune on it mostly because there are a lot of them floating around out there and I assume mine will fit into the average of all those. Anyway, I pulled 306 HP at the rear wheels with 341 Lb Ft of torque (See attached document). I would like to see more of both, but the best I can do for pump gas around here is 91 octane. Over time I hope to add a FMIC and downpipes along with some suspension parts to control it all, but at least it is a start.
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Last edited by rdkind62; 06-06-2014 at 02:20 PM.
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  #2  
Old 06-10-2014, 02:21 PM
kurt_cobain kurt_cobain is offline
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That does seem a bit low... are you using the stage 1+?

That reeeeally sucks about not having 93 in your area It's everywhere here. Sometimes when I vist oKLANhoma it's a little hard to find too. Ridiculous. But suprised to hear that about colorado...

There have been a LOT of dyno #'s I've seen that show the stage 1+ to be aorund 380hp"ish" and from what I can tell, it sure as hell feels like it. Can't wait to do a 0-60 pull... especially with the AWD!
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  #3  
Old 06-10-2014, 02:29 PM
Alpineweissmatt Alpineweissmatt is offline
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That number seems low to me too. I have an 335is and want to get the COBB but don't have access to 93 and won't be getting the intercooler upgrade (at least for now). I want to know that $900 will get me close to at least 400 crank HP.
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Old 06-10-2014, 02:32 PM
hondo402000 hondo402000 is offline
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does it have to do with the altitude of Colorado Springs
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  #5  
Old 06-10-2014, 02:48 PM
alpinweiss alpinweiss is offline
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Originally Posted by hondo402000 View Post
does it have to do with the altitude of Colorado Springs
Yes. In general, octane ratings are lower in all of the Rocky Mountain states.

Engines (non-turbocharged) produce less power at the higher altitudes. Now that turbocharged engines are much more common, I wonder if they will start increasing the octane ratings of the gasoline.

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Old 06-11-2014, 07:14 AM
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Quote:
Originally Posted by Alpineweissmatt View Post
That number seems low to me too. I have an 335is and want to get the COBB but don't have access to 93 and won't be getting the intercooler upgrade (at least for now). I want to know that $900 will get me close to at least 400 crank HP.
You have to remember if you are adding the Cobb tune to a 335is you are not starting with the 320HP that is the stated HP from a 335is N54 engine. When the flash is installed it is starting from the standard baseline of the N54 which is rated at 300HP. I can certainly feel the additional tq. that is always available now more so than the kick that you get from that temporary overboost you get from the stock version. One additional thing is that the dyno machine that I took my car to says that their readings are always less than any other dyno machine in town and I am OK with that since I am not just looking to play the numbers game but to actually do incremental upgrades. If I added the correction factor that some of the others use I would probably show a higher number. If you have lets say 20% loss in in the drivetrain then I am looking at about 367 at the crank so not too bad for now.
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Old 06-12-2014, 07:38 AM
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MasterYoda MasterYoda is offline
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I'm running a Cobb pro-tune by PTF on my 335is DCT no other mods. I'm about to pick up an ETS FMIC and have Jake re-do the Dyno tune.

Here are the results of the Dyno. Stock, OTS map and pro-tune.

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This Dyno was also reading low.

Definitely a noticeable difference from stock.


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  #8  
Old 06-12-2014, 10:34 AM
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rdkind62 rdkind62 is online now
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Quote:
Originally Posted by MasterYoda View Post
I'm running a Cobb pro-tune by PTF on my 335is DCT no other mods. I'm about to pick up an ETS FMIC and have Jake re-do the Dyno tune.

Here are the results of the Dyno. Stock, OTS map and pro-tune.

Attachment 445377

Attachment 445378

This Dyno was also reading low.

Definitely a noticeable difference from stock.


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Are you running 93 octane because it looks like you were getting about 330HP? I'm thinking the gas and my altitude are keeping my numbers down.
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Old 06-12-2014, 11:08 AM
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MasterYoda MasterYoda is offline
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Originally Posted by rdkind62 View Post
Are you running 93 octane because it looks like you were getting about 330HP? I'm thinking the gas and my altitude are keeping my numbers down.
Yes. I debated about throwing some e85 in the tank for some real fun but I wasn't convinced that I wouldn't have repercussions from it. It my DD so I don't want to go to crazy.


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  #10  
Old 06-12-2014, 10:32 PM
BashedBarrique BashedBarrique is offline
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Turbocharged engines should not loose power due to altitude, like a naturally aspirated engine does. The pressure relief (sometimes called blow off) valve is activated by the internal pressure of the system which is unrelated to atmospheric pressure.

That is why piston engine planes in WWII, designed for high altitude service (like the P-51), were equipped with superchargers.
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Old 06-12-2014, 10:39 PM
BashedBarrique BashedBarrique is offline
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Well, after doing a bit or research I see that due to efficiency issues a turbocharged engine will loose power at altitude but much less so than a NA engine.

I'm not sure that it would be of the magnitude you are experiencing though.
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Old 06-13-2014, 07:36 AM
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rdkind62 rdkind62 is online now
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I really not complaining about the numbers my car showed, and the guys that did the dyno were very impressed with it based on the fact that it was an OTS flash and nothing else. They had done baseline readings on a 135i just a few days before and said they only got a little more than 250 at the rear wheels. I really think they get low readings on their machine, which they readily admit to. They like to call their machine the "Heart Breaker" because it rarely gives you what you expect.
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Old 06-13-2014, 09:22 AM
BashedBarrique BashedBarrique is offline
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Quote:
Originally Posted by rdkind62 View Post
I really not complaining about the numbers my car showed, and the guys that did the dyno were very impressed with it based on the fact that it was an OTS flash and nothing else. They had done baseline readings on a 135i just a few days before and said they only got a little more than 250 at the rear wheels. I really think they get low readings on their machine, which they readily admit to. They like to call their machine the "Heart Breaker" because it rarely gives you what you expect.
306 rwhp is better than most of the "muscle cars" of the 60's and 70's. I'm sure it doesn't feel underpowered.

My 2006 325i is probably putting about half of that to the rear wheels and it is still plenty fun to drive.
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Old 06-13-2014, 12:14 PM
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Quote:
Originally Posted by hondo402000 View Post
does it have to do with the altitude of Colorado Springs
Quote:
Originally Posted by alpinweiss View Post
Yes. In general, octane ratings are lower in all of the Rocky Mountain states.

Engines (non-turbocharged) produce less power at the higher altitudes. Now that turbocharged engines are much more common, I wonder if they will start increasing the octane ratings of the gasoline.

Colorado's regular is 85 Octane. And, WITHOUT getting into an octane debate that has been rehashed so many times, our Owner manuals state that 91 rec, 87 min.
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