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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Procede or ecu detect octane?



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      06-15-2007, 10:41 AM   #1
Cookiemonster
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Procede or ecu detect octane?

does procede detect octane?
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      06-15-2007, 10:53 AM   #2
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The ECU won't adjust to any higher octane without being reprogrammed to do so. Using higher octance fuel requires a specific tune to utilise it. If your tune was programmed for pump gas then it won't take advantage of the benefits of higher octane fuel. It allows for high boost and more advanced timing without detonation. The engine will only build boost to the level the Procede tune wants it to and thus it will only add the necessary fuel for such boost levels. The ECU will pull out boost and timing if it detects problems, like a lot of activity detected by the knock sensor, but it will not advance timing or boost beyond their original programmed levels.
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      06-15-2007, 11:02 AM   #3
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The ECU won't adjust to any higher octane without being reprogrammed to do so. Using higher octance fuel requires a specific tune to utilise it.
That's not correct if you are running 91 Octane.
Both the stock ECU and the PROcede recognize the difference between 91 and 93 Octane and adjust/adapt accordingly.

Now for the OP, if you are running 93 Octane in your car, adding the 100 Octane will not do much as the PROcede at this point won't adjust much above 93 Octane.

If you are on 91 Octane, you can dump in 100 Octane and you'll get more power. It won't be necessary to dump 5-7 gallons of 100 Octane in though.
Make a mix of 93-95 Octane and you'll be set.
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      06-15-2007, 11:03 AM   #4
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The ECU won't adjust to any higher octane without being reprogrammed to do so. Using higher octance fuel requires a specific tune to utilise it. If your tune was programmed for pump gas then it won't take advantage of the benefits of higher octane fuel. It allows for high boost and more advanced timing without detonation. The engine will only build boost to the level the Procede tune wants it to and thus it will only add the necessary fuel for such boost levels. The ECU will pull out boost and timing if it detects problems, like a lot of activity detected by the knock sensor, but it will not advance timing or boost beyond their original programmed levels.
Factory ECU will adjust between 91 and 93 octane. You will make more power with having 93 octane or in your case if you were to poor 100 octane mixed with 91 octane you will make more power. You do not need any special tune to utilise it, just add 93 octane or higher, do about 3-4 WOT pulls in 3rd or 4th gear to let the ECU adapt, and you will make more power. unless your already running 93 octane.

you are right in the fact that the ECU will pull back timing if it does detect any type of knock and with 93 or 100 octane it will pull a bit more timing with the reduced knock.
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      06-15-2007, 11:06 AM   #5
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Originally Posted by merritt View Post
The ECU won't adjust to any higher octane without being reprogrammed to do so. Using higher octance fuel requires a specific tune to utilise it. If your tune was programmed for pump gas then it won't take advantage of the benefits of higher octane fuel. It allows for high boost and more advanced timing without detonation. The engine will only build boost to the level the Procede tune wants it to and thus it will only add the necessary fuel for such boost levels. The ECU will pull out boost and timing if it detects problems, like a lot of activity detected by the knock sensor, but it will not advance timing or boost beyond their original programmed levels.
The big secret is the procede actually induces knock retard, so by increasing octane the knock retard is reduced, and the engine makes more power.
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      06-15-2007, 11:21 AM   #6
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Cookiemonster,
According to shiv running 100oct will help even if you are running 93. It wont be a HUGE difference but it will be an improvement... throw a few gallons in there no need to fill up. It will help the engine run smoother too.
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      06-15-2007, 11:25 AM   #7
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Ok within a narrow range the ECU will adjust things. Since fuel up to 94 is readily available throughout different parts of the country the ECU is probably programmed to make use it. Going from 94 to 100 won't have a significant difference however.

As for what maps the Procede has I don't know. If it comes with a 91 octane map that is different from a 93 octane map I have no idea. I honestly haven't paid any attention to the thing.
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      06-15-2007, 12:22 PM   #8
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I am going to Island Dragway ISLANDDRAGWAY.com

This Drag strip is usually about .2 to .3 tenths slower than ATCO or EnglishTown.
So your saying its a normal track ?
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      06-15-2007, 12:39 PM   #9
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Wish we had one close to here. all our tracks suck.
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      06-15-2007, 01:07 PM   #10
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Run 100 octane. You're car will love it. Especially in this heat that we're getting here in CA these last few days.

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      06-15-2007, 01:15 PM   #11
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Im going to Famoso tonight!! 6 gallons of 100oct and 10 gallons of 91... Should be some fun! Only bad part is im back to RFT's on the heavy 18's.
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      06-15-2007, 01:19 PM   #12
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Im going to Famoso tonight!! 6 gallons of 100oct and 10 gallons of 91... Should be some fun! Only bad part is im back to RFT's on the heavy 18's.
nice what event do they have going on this weekend? is it just test n tune and do they have it going on tomorrow as well?
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      06-15-2007, 01:20 PM   #13
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Im going to Famoso tonight!! 6 gallons of 100oct and 10 gallons of 91... Should be some fun! Only bad part is im back to RFT's on the heavy 18's.
Sounds fun, I wish I could go but its the wifes bday. Let us know how you do!
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      06-15-2007, 01:23 PM   #14
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Yeah its just a test and tune, there is nothing tomorrow. There is no test and tune for a while there on saturday from what i can see on the calendar. I dont expect to do as good as i did in Palmdale, Its a better track but at LACR i was on light wheels with an ok 275 tire, now im on the stock 18's with the RFT's so we will see. Either way it will be fun! My friend is going to try and hit 11's with his STI, thats why im going.
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      06-15-2007, 01:24 PM   #15
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when will we be seing a 100 octane map from you shiv????
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      06-15-2007, 01:53 PM   #16
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Yeah its just a test and tune, there is nothing tomorrow. There is no test and tune for a while there on saturday from what i can see on the calendar. I dont expect to do as good as i did in Palmdale, Its a better track but at LACR i was on light wheels with an ok 275 tire, now im on the stock 18's with the RFT's so we will see. Either way it will be fun! My friend is going to try and hit 11's with his STI, thats why im going.
trust me you will do a lot better than you did at LACR even with your stock 18's with RFT's.

just feather that clutch and dont launch it so hard.... that track is hard to launch at, they dont prep the launch pad that well and its slippery.
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      06-16-2007, 01:47 AM   #17
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here ya go! I am right lane #129
Nice MPH... Get some better traction and you should do much better.
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      06-16-2007, 04:45 PM   #18
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I wish we had good tracks out here in socal!!
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      06-16-2007, 04:51 PM   #19
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I wish we had good tracks out here in socal!!
No kidding! So how did you do last night?
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