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      05-15-2013, 09:33 PM   #1
Maxspeed
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Question: Cobb and e85

I have a 2009 335i coupe.
Cobb stage 2: downpipes, intake, hpf exhaust, scoops.

Are there any maps for e85? I should note that I'm in California and using the wonderful 91 octane we have here.

And what mix should I run? 50/50?

Last but not least, how much more power will I make?
Any estimates on horses to the wheels on stage 2 Cobb on 91? What about e85?
Thanks!
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      05-15-2013, 09:39 PM   #2
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e30 race map load it try 40/60 log it and don't forget to change scalar if you go 50/50
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      05-16-2013, 12:38 AM   #3
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Quote:
Originally Posted by cwarren View Post
e30 race map load it try 40/60 log it and don't forget to change scalar if you go 50/50
+1,

and you don't really need an E85 map to run a low mix. with 91 you are stuck to drive or sport flavors at best. Mix in ethanol, and run aggressive maps. if you want a lot more then as cwarren mentioned go for E30. without an intercooler you will heatsoak quickly and lose power, but then you know that
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      05-16-2013, 01:12 AM   #4
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Yep, intercooler is on my to-do list. Also deciding if 265 PSS's are enough for traction in the rear. Or maybe a softer tire. Limited slip sounds tempting but is it worth it on stock snails?
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      05-16-2013, 08:27 AM   #5
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Quote:
Originally Posted by Maxspeed View Post
Yep, intercooler is on my to-do list. Also deciding if 265 PSS's are enough for traction in the rear. Or maybe a softer tire. Limited slip sounds tempting but is it worth it on stock snails?
I have 265 Conti's on mine and I put the Stage 1+FMIC Aggressive on the other day for a quick spin. Clutch is slipping pretty bad, but in first gear, those tires are no match. When you lay into it and the turbos spool, it'll just waste the tires. Not sure about second, as I didn't want to beat on a slipping clutch to bad, but I feel sure the 265s will have a hard time with 2nd too. It sucks that we can't put wider tire than that on these cars
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      05-16-2013, 10:25 AM   #6
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Quote:
Originally Posted by Maxspeed View Post
Yep, intercooler is on my to-do list. Also deciding if 265 PSS's are enough for traction in the rear. Or maybe a softer tire. Limited slip sounds tempting but is it worth it on stock snails?
I am in the same situation I have 255 PSS in the rear. I can deal with the small amount of spinning on map 2 (I run JB4), but when I run E30 I break traction easily in 2nd and in 3rd as well if its not above 60 degrees. I am getting the BMS flash and will be running +50% E85, because of this I will most likely be pulling the trigger on a LSD. I just couldnt see the point of having all the power and not being able to use it, lucky for me VAC motorsports is local
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      05-17-2013, 01:44 AM   #7
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Yeah it seems like FBO, these cars really need an LSD. I just don't have the money right now. Along with the LSD, don't people usually do like the sways or bushings or something, I remember hearing that the LSD mod is almost always accompanied by another mod, just can't remember what it is.
And yeah how many gallons of e85 and Cali 91 to run the e30 map?
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      05-17-2013, 01:57 AM   #8
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What I do is put $10-15 on e85 which should be 3-4 gallons and the rest 91.
LSD is really needed on this car Idk why BMW didn't include an option for that wtf? And try heating up your tires after a quick pull or two. That should help warm the tires up to be nice and sticky
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      05-17-2013, 02:06 AM   #9
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^ well if thats all your putting in thats def not going to add up to a E30 mix. Our fuel tanks hold 16.1 gallons (if im not mistaken) and remember 91 or 93 has up to 10% ethanol in it. I think if the fuel tank is empty you should run atleast 5 gallons of E85 and the rest 12 gallons 91. Me personally would run 6 gallons of E85 and 10 gallons 91. I think thats closer to a E30 mix. there is plenty e85 ethanol calculators out there and all you do is plug in the numbers and it calculates exactly for you.
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      05-17-2013, 02:10 AM   #10
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Well, I don't run my tank all the way down because I fill up Shell/Chevron at one station and the E85 station is 10 miles away so I just do the same fill up everytime around 50-75mls left.
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      05-17-2013, 02:16 AM   #11
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Yeah bmw should include the diff as an option on non-M cars. They would definitely make money on them.
And thanks for the mixture ratios!
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      05-17-2013, 04:20 AM   #12
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Ok, I think you might have mos-understood me....To me empty is when the first gas light goes off...And if I'm not mistaken, thats at 50 miles till empty, which is two notches under the quarter tank marker so the mixture is basically as good as its going to get since I literally fill up everytime with about 10 gallons of E85/93. And after I fill up at the E85 station then leave, go accross the street and fill up with Chevron/Shell/Exxon. .E85 in Texas is mainly at Krogers. The reason I go accross the street is because there regular gas at Krogers (93octane) is watered down gas and unbranded gas hopefully have to NEVER use it...In fact I dont even think if I was stranded I think I would go
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      05-17-2013, 11:29 AM   #13
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Quote:
Originally Posted by Maxspeed
Yep, intercooler is on my to-do list. Also deciding if 265 PSS's are enough for traction in the rear. Or maybe a softer tire. Limited slip sounds tempting but is it worth it on stock snails?
Pss grip well brand new, i will try it out on the e30 map once I get a new rear set. I might be running bigger than a 265 though. I've been running e30 map but my pss are almost bald so it's hard to get traction. LSD is always beneficial even on stock turbos
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      05-17-2013, 12:44 PM   #14
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Quote:
Originally Posted by BadassBlaze View Post
I have 265 Conti's on mine and I put the Stage 1+FMIC Aggressive on the other day for a quick spin. Clutch is slipping pretty bad, but in first gear, those tires are no match. When you lay into it and the turbos spool, it'll just waste the tires. Not sure about second, as I didn't want to beat on a slipping clutch to bad, but I feel sure the 265s will have a hard time with 2nd too. It sucks that we can't put wider tire than that on these cars
Say what? Why wouldn't you be able to put wider tires on your 335i than that? I have 275/30/19 MPSS in the back, FBO, no worries...
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      05-17-2013, 12:56 PM   #15
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Quote:
Originally Posted by OB
Quote:
Originally Posted by BadassBlaze View Post
I have 265 Conti's on mine and I put the Stage 1+FMIC Aggressive on the other day for a quick spin. Clutch is slipping pretty bad, but in first gear, those tires are no match. When you lay into it and the turbos spool, it'll just waste the tires. Not sure about second, as I didn't want to beat on a slipping clutch to bad, but I feel sure the 265s will have a hard time with 2nd too. It sucks that we can't put wider tire than that on these cars
Say what? Why wouldn't you be able to put wider tires on your 335i than that? I have 275/30/19 MPSS in the back, FBO, no worries...
Stock wheels/ fenders?
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      05-17-2013, 01:18 PM   #16
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Probably stock height too.

I have 19x10 VMRs and 265s and you ain't going much wider. Already rolled the fenders as tight as could without deforming the fender and it is extremely tight
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      05-17-2013, 03:35 PM   #17
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M-stock suspension, not stock wheels...
19x9,5

Of course it can be tight, dunno what et you guys are running either.
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      05-17-2013, 04:07 PM   #18
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I'm running 275/30-19 on a 9.5 inch wheel. No rubbing.
I did a 4 gallon mix of e85 just to see how the car runs. Now I think I'll switch to the aggressive map. E85 is pretty cheap her in Ca. It's about 40-50 cents cheaper than premium where I live.
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      05-17-2013, 04:56 PM   #19
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Quote:
Originally Posted by techwhiz
I'm running 275/30-19 on a 9.5 inch wheel. No rubbing.
I did a 4 gallon mix of e85 just to see how the car runs. Now I think I'll switch to the aggressive map. E85 is pretty cheap her in Ca. It's about 40-50 cents cheaper than premium where I live.
Why not run the e30 map? Is it not running good? And what tires are you running?
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      05-17-2013, 07:41 PM   #20
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For you guys running E85 mixtures, I'd definitely recommend adjusting the fuel scaler tables using ATR for the ethanol mixture you plan to run. Yes, the fuel trims are there and can correct to a certain extent, but I wouldn't be relying on that for proper fueling.

Since I also am in CA and have our garbage 91 octane pump gas, I started mixing in around 2 gallons of E85 (E20 blend) to boost my octane to run the stage 2+ aggressive map. But I also went in and modified the fuel scalers for the E20 fuel. That's my advice.

The other (more aggressive) option is Cobb's E30 race map. Just use one of the excellent ethanol calculators online to get your mixture right. I wouldn't go much further than E30 on the stock fuel pump, but that's just my opinion.
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      05-17-2013, 10:03 PM   #21
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A big part of why you all can fit a 275 tire (I'm guessing) is your car isn't that low. Mine is just really low and has a 10" wheel in the rear. Wish I could fit a 275, but don't want to trash my fenders
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      05-18-2013, 11:29 AM   #22
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Quote:
Originally Posted by BadassBlaze View Post
A big part of why you all can fit a 275 tire (I'm guessing) is your car isn't that low. Mine is just really low and has a 10" wheel in the rear. Wish I could fit a 275, but don't want to trash my fenders
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