[persian54]

Well, I was reluctant to move up from Map 3 since I don't really have access to anything but 91 octane, and I'm stock except for the BMS DCI.

But my friend with a 08 e90 has been running map 5 on 91 with DCI for the past few days with no problems.

And since it's pretty chilly (about 50 degrees), I decided to move up to Map 5 to see how it was...

Well, I have to say, it is quicker but something is strange:

for 1, whenever I floor it, when I'm in 2nd and it passes 5k rpm, the car doesn't seem smooth at all.. as if it's not able to really go... so I decided to shift (i have 'chicktronic') into 3rd, and similar thing happens...

And then, later, I decided to floor it again and the same thing happened except I ended up getting a SES light... pulled over, turned the car off, turned it back on, and everything was back to normal.
I was pretty much home already so I didn't really have much room to go WOT and I wasn't sure if I should..

So... is this because I went up to map 5 on 91?
Or is something else a problem here?

Thanks for any help...

[DigiSage]

Plug in your BT tool (which I assume you have because anyone who tunes should...) and tell us what the codes are.

[JayKay335i]

Could be pulling timing when you get up there. But yeah, you need to plug the BT tool in.

[persian54]

Bit on the lazy side right now :P

If the car runs fine tomorrow, great.

If not, I'll just text Terry and see if he's free

Love living so close to him lol

I'll def go back down to Map 3 though before I head out tomorrow

[bimmerlex]

I also just have an intake and on 91 octane. Been running on map 7 on all the beta revisions for past month without any problem... Check your car with BT scanner.

[persian54]

Originally Posted by bimmerlex

all the beta revisions .

I guess I should have mentioned that I have 1.4 Beta

[JayKay335i]

Nope. Doesnt matter. The answer is the same no matter who you talk to. See what codes your throwing.

[Belo]

i don't own a 335 yet, but plan to. I do have a supercharged car currently; and I would guess that maybe your car doesn't have the supporting mods and is retarding the timing so it doesn't knock (which can devastate your engine).

Again, I don't really have a clue about these cars because I don't get mine for a few months, but if it seems hesitant, it's probably too hot at those boost levels and not willing to damage itself. Think of it as a safety feature

[Mr. 5]

Just make sure you log the timing with a BT cable to make sure that things are running smoothly.

[MFKN3]

IMO, with only DCI and tune, the DCI is not really going to equate to anything over stock airbox. I think on 91 oct is pushing it a bit too hard.

[roozie2001]

its most likely timing plus the cali crap gas. Cuz the Vpower 93 that i use here is great for up to map 7 and runs amazing on map 5. only once did i limp on map 7 and thats cuz i was running the hell out of the car. And i have no supporting mods. Gas is the big difference maker not so much the mods. You can go no mods. Hell u can restrict the intake but put 100 octane and still use map 1-7 no problem.

[MFKN3]

ignition retard is likely cause of the erratic power.

imo, you guys are insane pushing your engines like that with no supporting mods.

[DigiSage]

I've been running 91 octane from Shell on map 5 (1.4 betas rev6 through rev8.4) with no problems. The only other mod I have is the DCI as well. Because I read the directions when I installed the JB3, I was fully aware of the fact that I was going against BMS advice by running map 5 since the directions clearly say "use at least 93 octane". Because I was fully aware that I was doing something "unsupported", I made sure I had a BT tool just in case something funny happened, so I could find the actual cause.

Fortunately, I've never actually had a problem with 91 octane on map 5. I got a hidden code, just once, a few weeks ago, and since then, nothing. No CEL, no SES, no limp, no codes, no hidden codes. So, it is definitely possible to do, but I get the feeling I'm riding right on the edge of acceptability, so I wouldn't be surprised if someone else had trouble.

In short: borrow, buy, steal or otherwise obtain a BT tool and plug it into your car and tell us what the codes are. No amount of forum speculation will help you until you do that.

[MFKN3]

I can push my tune to the max as well and it all feels fine and no codes; but when I datalog, I can actually see significant ignition dropouts which is obviously not good news. This is what I am referring to and affects the longevity of your engine and not always worth it at the sake of squeezing out an extra couple ponies.

Then again, I am in no way an expert, but simply offering advice based on my personal experience. A replacement N54 engine here is probably $40k usd, so I am much more conservative

[Jrlelli]

Originally Posted by xsboost

I can push my tune to the max as well and it all feels fine and no codes; but when I datalog, I can actually see significant ignition dropouts which is obviously not good news. This is what I am referring to and affects the longevity of your engine and not always worth it at the sake of squeezing out an extra couple ponies.

Then again, I am in no way an expert, but simply offering advice based on my personal experience. A replacement N54 engine here is probably $40k usd, so I am much more conservative

what are u running? will a JB+ screw up the ignition?

[DigiSage]

Originally Posted by xsboost

I can push my tune to the max as well and it all feels fine and no codes; but when I datalog, I can actually see significant ignition dropouts which is obviously not good news. This is what I am referring to and affects the longevity of your engine and not always worth it at the sake of squeezing out an extra couple ponies.

Then again, I am in no way an expert, but simply offering advice based on my personal experience. A replacement N54 engine here is probably $40k usd, so I am much more conservative

Which BT variables are you graphing to see this? "Ignition angle cylinder" 1-6?

[MFKN3]

Sorry, I should have said I am using the procede software and looking at canbus/actual ignition.

I believe JB3 users will get a similar datalog capability soon.

Jrlelli: I don't really know much about JB+ other than it is a basic entry level tune, so you will be fine

[DigiSage]

No one here mentioned JB+.... I'm using the JB3 and the OP is too.

edit: whoops, I now see the BT+ post above.

[Jrlelli]

Originally Posted by xsboost

Sorry, I should have said I am using the procede software and looking at canbus/actual ignition.

I believe JB3 users will get a similar datalog capability soon.

Jrlelli: I don't really know much about JB+ other than it is a basic entry level tune, so you will be fine

ok thanks for the input.

[GOTHP]

I use map5 daily with dci, and sometimes when i do WOT it feels like car is having hard time to go forward...(clicking sounds coming from under the hood)

I fixed this going from map5 to map3 and put it back on map5.... and I also Bt scanned it no codes at all..

this problem occured to me today again, so after dinner I will change the map setting on my car from 5 to 3 and will do some WOT and see how it goes...

[midlife]

Did you guys know that if your car, mods, and octane cannot support a higher map ( like map 5) your car may still run without codes.

But that does not mean you are running faster. You may actually be faster on a lower map like map 3.
Terry has stated this many times.

For you guys with ocassional car studdering problems on map 5 -
there is a very good chance your car will run smoother AND faster on map 3

[Dvdman]

I have been running map 3 for the last 3 weeks with the jb3 1.3. Last friday I swithed to map 5. I am on 91 oct, with a DCI only as well. I can tell the difference big time. I havent run into any problems so far. Do regular gas stations run 95 oct? I havent seen any here in Chicago but I havent really been looking.