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      09-23-2011, 03:57 PM   #23
sluflyer06
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Someone may, I'll eventually certainly have FBO #s for the cobb, after the fmic gets put on I'll re-dyno on Stg1, then again with downpipes on stg2+. Unless they come out with Stage 1+ before I get downpipes then I give that a shot.

Jeff- According to Cobb's site the maps are indeed available to the Public but are still in Beta. I'm not sure what you mean by lowballed, cleraly the JB4 is not performing as intended but nothing was done to artificially lower its #s.
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      09-23-2011, 04:03 PM   #24
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
The maps are actually available to the public, final release not beta.
***

On another note:
These Jb4 dyno graphs seem to be low balled in some aspect.


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      09-23-2011, 06:45 PM   #25
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Want to see. Tests done on a dynojet not a mustang ..
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      09-23-2011, 08:23 PM   #26
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Wow! Thanks for posting this!!

I am sooooooo glad I got a flash tune on my N54 - ESS. I was close to buy JB4 but having done my research I settled on a flash-at-home solution. When I take the car in for a service and all I have to do is hook it up and flash back to stock.

As for DCI I think Cobb recommend using the stock intake as per their testing. I am very happy Cobb did this research and made it public (note: INDEPENDANT TESTS - they gain no $$$ out of it). Again, less hassle come service time and warranty INTACT!
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      09-23-2011, 09:26 PM   #27
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Originally Posted by Gunzaro View Post
Wow! Thanks for posting this!!

I am sooooooo glad I got a flash tune on my N54 - ESS. I was close to buy JB4 but having done my research I settled on a flash-at-home solution. When I take the car in for a service and all I have to do is hook it up and flash back to stock.

As for DCI I think Cobb recommend using the stock intake as per their testing. I am very happy Cobb did this research and made it public (note: INDEPENDANT TESTS - they gain no $$$ out of it). Again, less hassle come service time and warranty INTACT!
Dci makes more power then the stock restrictive air box
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      09-23-2011, 10:25 PM   #28
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Quote:
Originally Posted by sluflyer06 View Post
Its really in the title, JB4 felt about as good as the dyno looks which is all over the place, big timing corrections in 46F ambient or 95F didn't matter, running map 1. Its peak # is even misleading beacuse it was just a momentary peak. Cobb map looks smooth and power is way up.

Next up is a intercooler upgrade and see how much top end we pick up, start of run was 86F IAT end of run 136F (58% rise!!!)
Why do nearly all of these dyno show nearly no power below nearly 3000rpm?
These engines are known for low RPM torque yet these graphs don't show this.
Why?

I can't see these tunes creating that much lag given they are using the same small turbos.
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      09-23-2011, 10:30 PM   #29
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They're in line with stock numbers.

Automobile Mag Numbers



Another odd graph.

Peak torque doesn't occur at what BMW claims. There is quite a bit of lag there.

Also, the N55 supposedly builds it's torque a bit lower than the N54, and that graph shows the opposite.

Even with the high tech servotronic intake, the N54's torque curve is broader and smoother.
The N55 has a higher "peak" but it's more of a spike, and it dies quicker, which is contrary to what BMW claims about the N55.
These graphs don't support the claim that twin scroll has better low rpm torque build, nor that it has better high rpm torque.
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      09-24-2011, 08:38 AM   #30
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Quote:
Originally Posted by RPM90 View Post
Why do nearly all of these dyno show nearly no power below nearly 3000rpm?
These engines are known for low RPM torque yet these graphs don't show this.
Why?

I can't see these tunes creating that much lag given they are using the same small turbos.

Sometimes doing that will cause knock !! Having the ramp up to hard on the low rpm is not healthy !There's a reason for this tuning aspect.also note,all turbos have lag on the low end..
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      09-24-2011, 09:23 AM   #31
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BMW's peak torque RPM claims have always mystified me...they must do it in 6th gear and go WOT at 1K rpm to get it to spool so early.
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      09-24-2011, 03:35 PM   #32
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sluflyer06... you need to meet up with me and some of the other 1er guys in the area (Bogart, onefastman, RxBMW, dawild1, etc.) sometime.

Also, thanks for the dyno, it further justifies my Cobb AP purchase over the piggy tunes... how much did that shop charge you for dyno time? I'm thinking of organizing a bunch of local BMW guys for a dyno day sometime in the future.
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      09-24-2011, 04:26 PM   #33
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Quote:
Originally Posted by thebigragu99 View Post
Sometimes doing that will cause knock !! Having the ramp up to hard on the low rpm is not healthy !There's a reason for this tuning aspect.also note,all turbos have lag on the low end..
Automobiles dyno did it.
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      09-24-2011, 08:42 PM   #34
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Quote:
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sluflyer06... you need to meet up with me and some of the other 1er guys in the area (Bogart, onefastman, RxBMW, dawild1, etc.) sometime.

Also, thanks for the dyno, it further justifies my Cobb AP purchase over the piggy tunes... how much did that shop charge you for dyno time? I'm thinking of organizing a bunch of local BMW guys for a dyno day sometime in the future.
Definitely, I didn't see the thread for the last meet until the day after or I'd have been there. Dyno time was $75 for 3 pulls w/wideband, I'm sure we could probably organize a dyno day, they seem to be pretty cool guys even if they're clueless with Euro cars but at least they will say outright they don't know a thing about them and they mostly work on/tune GM/Ford.
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      09-24-2011, 09:06 PM   #35
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Quote:
Originally Posted by sluflyer06 View Post
Definitely, I didn't see the thread for the last meet until the day after or I'd have been there. Dyno time was $75 for 3 pulls w/wideband, I'm sure we could probably organize a dyno day, they seem to be pretty cool guys even if they're clueless with Euro cars but at least they will say outright they don't know a thing about them and they mostly work on/tune GM/Ford.
I was also thinking of contacting ET Tuning (Union, MO - bit of a drive) for a dyno day... they have Eurocar expertise and are a Cobb ProTuner. There's also Adrenaline in St. Peters (I think) but I've always thought of them as really JDM.

If you're on Facebook we have a pretty large StL BMW group... PM me if you want the link to the group (good way to get updates on meets, etc.).
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      09-24-2011, 09:27 PM   #36
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Originally Posted by thebigragu99 View Post
Dci makes more power then the stock restrictive air box
Hate to say it champ but: http://www.1addicts.com/forums/showt...ock+intake+dci

Cobb stage 1 bear in mind, but still...

This is INDEPENDANT testing. And with 5 runs a piece to boot.

See also: http://blogs.cobbtuning.com/2011/06/...ir-box-vs-dci/

I have DCI too but I removed them in favor of the stock setup with a drop-in filter.

Note: ESS ALSO recommend the stock setup + drop-in. They do not actively sell DCI.

Higher boost levels + meth etc then yes, there is a benefit to DCI.
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      09-24-2011, 09:30 PM   #37
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Quote:
Originally Posted by Kamal View Post
I was also thinking of contacting ET Tuning (Union, MO - bit of a drive) for a dyno day... they have Eurocar expertise and are a Cobb ProTuner. There's also Adrenaline in St. Peters (I think) but I've always thought of them as really JDM.

If you're on Facebook we have a pretty large StL BMW group... PM me if you want the link to the group (good way to get updates on meets, etc.).
Ohhhh Adrenaline lol, I won't even get started on that place, but yes its a JDM place, guy name Chuck and his wife Suzy own it, they've got a pretty awesome R33 Skyline GT-S actually.

PM coming your way.
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      09-25-2011, 11:27 PM   #38
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interesting .. might have to sell the JB4 now
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      09-26-2011, 08:22 AM   #39
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11.9@114 looks like your making some great power so why sell? Cobb doensn't have meth maps yet anyway. Assuming everything is good. If it ain't broke don't fix it.
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      09-26-2011, 09:14 AM   #40
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Quote:
Originally Posted by Gunzaro View Post
http://www.e90post.com/forums/showthread.php?t=588574

everyone always gets different results. it all depends on how much power you're looking to make, ambient temps, air pressure, altitude, etc
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      10-13-2011, 11:54 PM   #41
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Quote:
Originally Posted by 1speedbike View Post
http://www.e90post.com/forums/showthread.php?t=588574

everyone always gets different results. it all depends on how much power you're looking to make, ambient temps, air pressure, altitude, etc
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      10-14-2011, 02:19 AM   #42
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What were the AFR's for the Cobb Vs. jb4?
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      10-14-2011, 10:56 PM   #43
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Not a whole lot of info here...

What map was the JB4 on? How many adaption runs did you give each tune, stock, JB4 and Cobb? What tune did you drive to the dyno on?
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      10-17-2011, 08:54 AM   #44
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Originally Posted by FORCED AIR View Post
Not a whole lot of info here...

What map was the JB4 on? How many adaption runs did you give each tune, stock, JB4 and Cobb? What tune did you drive to the dyno on?
Map 1. Adaptation runs? I'd been running Map 1 for at least a week+ as a daily driver, so countless WOT runs. Stock didn't get any adaptation and doesn't show it needed any either. Drove to the dyno on Map 1.
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