COBB AccessPORT Updates for Europe, Z4i, Z4is, 1M and New Stock Throttle Stage2+ Maps

[Texas F1]

But wait, there's more. I also was going to mention that the stock exhaust weighed only 26.2 lbs compared to about 34.6 lbs for the Eisenmann. So, I'm carrying around an additional 8.4 lbs.

[ADVANT123]

I'm curious as to why the 1M stage I map makes more torque than the 135/335i Stage I map...

[robertm]

So, what exaclty have you done to the exhaust system? No cats at all now and free flowing axle back? Meaning catless DPs, catless midpipe and free flowing axleback? Just trying to clarify what you did exactly. Also, are both dyno runs on the same software (beta 1) or is Cobb tuning the software for your new setup?

[RnmEvo9]

Originally Posted by Texas F1

I have some dyno results now after swapping the cat-back system. With the stock tune (prior to the AccessPORT), the car made 294 WHP (max), 381 ft-lb (max), at 13.95 PSI. With the AccessPORT stage 1 tune, max horsepower increased to 308 WHP, torque was 429 ft-lb (max), at 18.69 PSI. With the addition today of the Eisenmann race cat-back exhaust, figures were 324 WHP (max), 410 ft-lb (max), at 17.99 PSI.

Net effect of swapping the cat-back looks like it was an increase of 16 WHP, but a loss of peak torque. The torque curve actually improved; that is, the average torque across the dyno pull was higher, although it didn't spike as much around 2800 RPM as it had earlier. The power really picks up around 4,000 RPM and is sustained until redline. Car feels very strong with this setup.

I'll see if I can figure out a way to scan and post the actual report. Next project for the spring will likely be a FMIC.

What kind of dyno was this on?

[ADVANT123]

Originally Posted by robertm

So, what exaclty have you done to the exhaust system? No cats at all now and free flowing axle back? Meaning catless DPs, catless midpipe and free flowing axleback? Just trying to clarify what you did exactly. Also, are both dyno runs on the same software (beta 1) or is Cobb tuning the software for your new setup?

From what I understand, the eisenmann exhaust replaces everything except for the downpipes.

[Texas F1]

Originally Posted by RnmEvo9

What kind of dyno was this on?

It's a Mustang Dynamometer.

[Texas F1]

Originally Posted by ADVANT123

From what I understand, the eisenmann exhaust replaces everything except for the downpipes.

The only thing replaced was the cat-back system. In other words, just the muffler and the pipes that bolt up to the connecting flange.

Eisenmann also offers a "full" system that replaces the cats and the resonator. I just bought the rear portion.

[Texas F1]

Originally Posted by robertm

So, what exaclty have you done to the exhaust system? No cats at all now and free flowing axle back? Meaning catless DPs, catless midpipe and free flowing axleback? Just trying to clarify what you did exactly. Also, are both dyno runs on the same software (beta 1) or is Cobb tuning the software for your new setup?

The dyno runs were using the same software--the "stage 1" which was installed in November. No additional tuning was done to accommodate the exhaust. My understanding is that the stock tune doesn't really recognize things like exhaust swaps--this tune was able to adapt to the increased flow.

[robertm]

Wasn't it Cobb that was saying they thought the axle back factory exhaust was very restrictive? This definitely proves them right. 16 whp, especially on a Mustang dyno, is huge power increase for just muffler change!

I can't wait to see what happens when the cats go away, a better FMIC is installed and better air intake added! I wouldn't be surprised if the car is gets close to 375 whp on the Mustang

[ADVANT123]

What's interesting is that HP Autowerks also saw a 15ish who gain on their 1M when they switched out the midpipes and Borla catback muffler. I wonder if the N54 midpipes are as restrictive as everyone thinks.

[M1one1M]

When will Cobb release their finalised Stage 1 tune not just the beta? and is there any longevity issues with running 16-18psi on the stock turbo's?

Thanks

[robertm]

Originally Posted by ADVANT123

What's interesting is that HP Autowerks also saw a 15ish who gain on their 1M when they switched out the midpipes and Borla catback muffler. I wonder if the N54 midpipes are as restrictive as everyone thinks.

That is interesting. I went back and found the post and they are running GAIC stage 1 tune so the two cars are reasonably apples to apples. Honestly, even less restricted back pressure from the free flow midpipes probably doesn't matter until you get into the stage 2 level of tune. Then you are running an FMIC as well and increasing the boost pressure through out the entire system.

Possibly with a stage 1 level of tune you reach a certain level of reduced back pressure and anything less than that doesn't create extra hp. Not certain if this is right or not, just thinking (typing) out loud here. Seems reasonably plausible though..

[ESC OFF]

I finally got around to installing the Cobb tune, my M is stock except for the Remus Sport exhaust, the tune really added a lot of low end torque. The tune in combination with the new exhaust makes the car very strong, I'm very pleased with the result.

[MrRoboto]

Originally Posted by ESC OFF

I finally got around to installing the Cobb tune, my M is stock except for the Remus Sport exhaust, the tune really added a lot of low end torque. The tune in combination with the new exhaust makes the car very strong, I'm very pleased with the result.

Doesn't the Cobb tune 'smooth' out the torque so it more linear as in a NA power plant?

[ESC OFF]

Originally Posted by MrRoboto

Doesn't the Cobb tune 'smooth' out the torque so it more linear as in a NA power plant?

There's 2 versions of the Sport and Agressive maps available, stock and linear. The linear map smooths out the throttle response and is more linear than stock. So, yes.

[M1one1M]

Does the 'M' button still function?

[ADVANT123]

Originally Posted by M1one1M

Does the 'M' button still function?

M button is fully functional like stock

[M1one1M]

Originally Posted by ADVANT123

M button is fully functional like stock

So even if you are using the aggressive 'stock' throttle map on the COBB tune not the 'linear' throttle map and you press the 'M' button it still sharpens up the throttle response over and above the COBB throttle maps?

Thanks

[M1one1M]

Anyone know why most of the 135i in COBB's dyno database are making more power than the 1M by 30-50hp yet are not making the same amount of torque?
Link to COBB Dyno graph below.
http://accessecu.com/dyno/index.php?...rgb2=204000000

[ADVANT123]

Originally Posted by M1one1M

So even if you are using the aggressive 'stock' throttle map on the COBB tune not the 'linear' throttle map and you press the 'M' button it still sharpens up the throttle response over and above the COBB throttle maps?

Thanks

Correct. The difference isn't as drastic as the "stock" tune vs the "M-Sport mode" since the Cobb tune enhances the response of the engine even in non "M-Sport" mode.

[MrRoboto]

Originally Posted by ADVANT123

Correct. The difference isn't as drastic as the "stock" tune vs the "M-Sport mode" since the Cobb tune enhances the response of the engine even in non "M-Sport" mode.

Is the M button programmable in any way? It would be cool to have the 'linear' map activated as normal but when you hit the M button the aggressive map kicks in. Not sure if this is doable.

[ADVANT123]

Originally Posted by MrRoboto

Is the M button programmable in any way? It would be cool to have the 'linear' map activated as normal but when you hit the M button the aggressive map kicks in. Not sure if this is doable.

Not sure what can be done here - best to shoot an e-mail to Rob@Cobb.