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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 > Cobb Stage 1 race gas maps?



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      05-14-2013, 02:01 PM   #1
Malaka1
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Cobb Stage 1 race gas maps?

I am currently running the Stage 1 aggressive map all I have is a dual cone intake and the Cobb AP. So if I go to the track and throw in 5 gallons of MS109 are there any maps to take advantage of the race fuel? Or should I just go pump 93 for consistent runs I imagine running more boost without intercooler and downpipes would just heatsoak the motor.. Any advice?
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      05-14-2013, 02:13 PM   #2
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I would strongly advise you to not use the race mapping with a dci as your only mod, the advance and boost characteristics will not play nice with your motor. As you speculated, the OE downpipes and intercooler aren't up to the task, an enormous amount of heat and backpressure will build up. The race map requires a FBO car to be in pretty good shape to run well, so a more or less stock motor won't fair well. You could easily nuke your primary cats, or worse.

Edit: Great call with SB as the interior though!
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      05-14-2013, 02:23 PM   #3
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If you have ATR, you could copy over the timing table from the race map, onto Stage 1A and reflash to take advantage of the higher octane.
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      05-14-2013, 02:27 PM   #4
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Quote:
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If you have ATR, you could copy over the timing table from the race map, onto Stage 1A and reflash to take advantage of the higher octane.
That's a good point, but will the car be able to hit those timing targets on OE downpipes and intercooler? I'd imagine it will fall flat on its face quite quickly if the ambient temps aren't frosty.
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      05-14-2013, 02:39 PM   #5
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Quote:
Originally Posted by 135Pats View Post
That's a good point, but will the car be able to hit those timing targets on OE downpipes and intercooler? I'd imagine it will fall flat on its face quite quickly if the ambient temps aren't frosty.
Shouldn't be too much of a problem. You normally need to worry about that when you start playing with load targets (boost), as that will have an effect on IAT/backpressure. I'd say it's worth the OP giving it a shot, might as well take advantage of the octane
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      05-14-2013, 02:43 PM   #6
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Only way to know is to do a log. Start conservative.

We've seen guys trap 115 or so on Race Gas Tune only cars before.
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      05-14-2013, 03:07 PM   #7
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you can copy aggressive timing if you are running over 100 octane no problem.

With that said, at the track, you will quickly heat soak your intercooler and what happens is your DME will start pulling timing (based on IAT timing compensation tables), so basically you won't be hitting your timing targets anyway.

If you are going for multiple laps, I suggest you run the race fuel anyway for consistency and to protect your engine. We tend to forget that one or two pulls on a highway are very different then the hell we put the engine through on a track.
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      05-14-2013, 03:08 PM   #8
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Wait a second are you going for a drag strip or a closed loop track?
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      05-14-2013, 03:10 PM   #9
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Quote:
Originally Posted by 135Pats View Post
I would strongly advise you to not use the race mapping with a dci as your only mod, the advance and boost characteristics will not play nice with your motor. As you speculated, the OE downpipes and intercooler aren't up to the task, an enormous amount of heat and backpressure will build up. The race map requires a FBO car to be in pretty good shape to run well, so a more or less stock motor won't fair well. You could easily nuke your primary cats, or worse.

Edit: Great call with SB as the interior though!
+1! great advice here. The race gas map is VERY extreme. Works fine with the right hardware, but will probably murder a stockish set up like op's.
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      05-14-2013, 03:32 PM   #10
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1/4 mile track, so from what I gather don't go beyond Stage 1 Aggressive. I live in FL so it will be hot out already. I will just save the money I would waste on race fuel and put that towards an intercooler. I just had my water pump and thermostat fail so there goes $1,200..
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      05-14-2013, 03:36 PM   #11
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Quote:
Originally Posted by Malaka1 View Post
1/4 mile track, so from what I gather don't go beyond Stage 1 Aggressive. I live in FL so it will be hot out already. I will just save the money I would waste on race fuel and put that towards an intercooler. I just had my water pump and thermostat fail so there goes $1,200..
I would definitely raise the octane of my mix before heading there.
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      05-14-2013, 04:24 PM   #12
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if ur worried about heat soak just bring one of these with some cold water water/rubbing alcohol mix and spray down the IC before each run - super cheap haha.

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      05-14-2013, 09:36 PM   #13
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if ur worried about heat soak just bring one of these with some cold water water/rubbing alcohol mix and spray down the IC before each run - super cheap haha.

kindda causes surface rust after awhile. Use pure cold water for the same effect- the rust.
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