[enrita]

Originally Posted by JStang

I am running the Cobb V4.01 maps and experienced code 2A17 (DMTL diagnosis module tank leakage, system failure) and misfire on cylinder 4. I tried getting on it from about 2,500 RPM's in third gear and the car didn't accelerate at all then I threw a CEL and the car was shaking under throttle. I turned the car off at the next stop light and fired it back up and the CEL was gone as was the shaking.

Not sure if the new maps are to blame or something else but just wanted to get some input from you guys.

there are many threads about 2A17.

for the missfire is the usual suspects.

[JStang]

Originally Posted by enrita

there are many threads about 2A17.

for the missfire is the usual suspects.

I did some reading on the 2A17 and I suspect a coil is to blame for the cylinder 4 misfire. I was just curious if others have had these issues with the new maps.

[Cozy]

Originally Posted by gboop

What made you think that you were running rich?

A little more soot, worse MPG and on cold start (actually cold outside temps) I swear I smelt fuel briefly.

[enrita]

Originally Posted by JStang

I did some reading on the 2A17 and I suspect a coil is to blame for the cylinder 4 misfire. I was just curious if others have had these issues with the new maps.

i have done 3800 hard miles in 2 weeks including 4 laps at the ring on the V400-V401 and 0 missfires

[rooringhusky]

Originally Posted by COBB Tuning

There are no tuning differences between v400 and v401, just the fix for the error code some were getting. The extra soot at idle on the tailpipes is odd though. I'll pass that info on to our calibration team though.

Ian

Originally Posted by crypticc

Maybe we are just 'enjoying' the tune a little. Personally I am not noticing or bothered by soot. but do notice alongside the upside of quicker response compared to v 301 that I perceive less mpg on constant but speed cruising. Say at 80 where i used to get easy 30 mpg is now close to 26. Maybe without realising it I am driving less conservatively even when I think I am.

Originally Posted by JamJay

A little more soot, worse MPG and on cold start (actually cold outside temps) I swear I smelt fuel briefly.

Ian, I can assure you there HAS to be a difference between something on v400 vs v401...

I have run v401 for almost two weeks now...Previously was on v400 just so you know..And although I have not had any check engine lights or thrown any codes on the new maps...I have noticed a HEAVY decrease in highway mileage per gallon...This is also experienced even during part throttle situations..

I havent noticed the soot on my tips as much as others have..but regardless there is still a big difference in mpg that is unexplainable?

I will be going back to v400 tomorrow and staying with it until a fix or change is made...Please keep us updated bc it doesnt seem like im alone with the issues..Thanks in advance

[Ferruccio]

How up to date are the dynojet numbers with the COBB tune in the Tune Comparison Chart sticky? It looks like JB4 is still offering higher peak numbers, but COBB keeps updating their software so much, and I'm still leaning towards the COBB in principle (I like flashes better than piggybacks).

[Bash]

Originally Posted by rooringhusky

Ian, I can assure you there HAS to be a difference between something on v400 vs v401...

I have run v401 for almost two weeks now...Previously was on v400 just so you know..And although I have not had any check engine lights or thrown any codes on the new maps...I have noticed a HEAVY decrease in highway mileage per gallon...This is also experienced even during part throttle situations..

I havent noticed the soot on my tips as much as others have..but regardless there is still a big difference in mpg that is unexplainable?

I will be going back to v400 tomorrow and staying with it until a fix or change is made...Please keep us updated bc it doesnt seem like im alone with the issues..Thanks in advance

what is your ROM, i experienced a decrease in mileage, ive since changed to stock and mileage has improved as much as 35%, but loss of performance.

[Pseudo Nim]

Where can I find v4.00? I think it has been removed from the site, right?

[enrita]

Originally Posted by Pseudo Nim

Where can I find v4.00? I think it has been removed from the site, right?

yes removed since caused some codes on certain ECU. just use the V401 beta.

[Lulz_M3]

I just went from stage 1 V301 to V401 Stage 2+ (after installing the supporting mods)and partial throttle cruising is definately eating the gas, about 2-3mpg difference with the cruise set at 80mph.

[marv85]

Originally Posted by Bash

what is your ROM, i experienced a decrease in mileage, ive since changed to stock and mileage has improved as much as 35%, but loss of performance.

barke 3am bitkazder ktir :P

man, you never sent out that invite on gmail. ba3dak newe teje 3al USA?

[O HELLA BMW]

This Sunday in going to get the following installed

Agency power fmic
Er charge pipe with hks bov
Injen true dual intakes

now what map and stage should I install with my mods??
Btw I have a ac shnitzer axle back exhaust

[rader1]

Stage 1+ fmic aggressive (assuming you have 93, sport if 91)

[marv85]

Originally Posted by rader1

Stage 1+ fmic aggressive (assuming you have 93, sport if 91)

+1

Rader1 buddy don't hold out on updates

[rader1]

Originally Posted by marv85

+1

Rader1 buddy don't hold out on updates

Unfortunately it is taking longer to do the install of the meth kit due to some tedious fab work having to be done to mount the tank in the trunk as I requested. HOWEVER, the install is being finished as I'm typing this. Believe me, I want to be able to give updates more than you want them lol
Work on the "foundation" of the map will begin this afternoon and dyno tuning will be begin tomorrow morning. Its actually raining at my location now so I'm not too dissapointed because I wouldn't be able to push it anyway.

[marv85]

Originally Posted by rader1

Unfortunately it is taking longer to do the install of the meth kit due to some tedious fab work having to be done to mount the tank in the trunk as I requested. HOWEVER, the install is being finished as I'm typing this. Believe me, I want to be able to give updates more than you want them lol
Work on the "foundation" of the map will begin this afternoon and dyno tuning will be begin tomorrow morning. Its actually raining at my location now so I'm not too dissapointed because I wouldn't be able to push it anyway.

hahaha

so are they going to use an OTS map as a base?

[rader1]

Originally Posted by marv85

hahaha

so are they going to use an OTS map as a base?

Honestly, i dont know. Thats something i completely forgot to ask about.

[rooringhusky]

Originally Posted by Bash

what is your ROM, i experienced a decrease in mileage, ive since changed to stock and mileage has improved as much as 35%, but loss of performance.

I have ROM I8A0S

[rooringhusky]

Originally Posted by rader1

I recieved word from the shop that my car/build/tune will be featured on www.motoiq.com

It's about time the N54 starts getting some respect in the automotive community and hopefully that'll help spread the word.

Hey rader1 I'm excited to see the results and coverage on your car!! Really happy for you buddy

Really look forward to more updates..dont hold back im with marv on this one

[rader1]

Originally Posted by rooringhusky

Hey rader1 I'm excited to see the results and coverage on your car!! Really happy for you buddy

Really look forward to more updates..dont hold back im with marv on this one

Thanks man, the car should be on the dyno early tomorrow morning and i'll update ASAP

[AU335i]

Originally Posted by rader1

Thanks man, the car should be on the dyno early tomorrow morning and i'll update ASAP

good luck on dyno results!

[Beachside Boostin]

My new cobb just arrived. I am running bone stock and I am looking for the safest option and I'm not overall concerned about the latest and greatest (beta, etc.) b/c I drive a lot for my job and I'm doing what I can to stay away from the mod bug until I am out of warranty in a couple years. I'm in FL running 93 and after countless hours of thread reading I am thinking v301 is my best option? Stage 1 agressive, sport? I have no plans of FMIC at this point.