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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 > JB+ at 100% vs. JB3 on Map 5? Anyone?



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      07-29-2009, 01:16 PM   #1
1slow335
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JB+ at 100% vs. JB3 on Map 5? Anyone?

Guys I need a little advice here. I have been running my JB+ at 100% for a few months on 94 octane and while it's loads of fun I have gotten used to the power. That and I want to beat my buddy in his C6 LS3 Corvette. lol

If I upgrade to a JB3 running maps 4 or 5 on 94 octane will I feel or get much more power vs running the JB+ at 100%?

Thanks in advance!
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      07-29-2009, 01:46 PM   #2
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as far as JB+ goes it cant hold a candle to the jb3 map 4 or 5. it can be competitive against map 3 at best but still doesnt do all that map 3 does for your car. Especially Since your running 94 octane u can easily run map7 with no problems cuz i run map 7 with no mods and 93 octane and im in a lot hotter climate than you are being in Houston, TX.

Now to the second part of your question/comment. You can get a JB3, FMIC, catless DPs and exhaust. Run Map 8 with Race Gas and race a LS3 Vette stock. You'll keep up with him if not get him by a car til 100mph but then you can kiss your @$$ goodbye. You'll look at C6 taillights. Now if he does any thing like a header down exhaust, intake or even worse cams, dont even race him cuz hes gonna embarrass you. That car is on a whole different level.
hope that helps
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      07-29-2009, 01:54 PM   #3
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there really is a night and day difference between a JB+ and JB3. I made the switch and couldn't believe it.
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      07-29-2009, 02:44 PM   #4
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Quote:
Originally Posted by JeffL View Post
there really is a night and day difference between a JB+ and JB3. I made the switch and couldn't believe it.
+1

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      07-29-2009, 02:55 PM   #5
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JB+ vs. JB3 map 1 maybe...
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      07-29-2009, 04:04 PM   #6
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damn all these houston guys on the forums, but no one ever comes to the meets!
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      07-31-2009, 07:49 PM   #7
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Originally Posted by avantix View Post
Thanks for the insight guys. Time to upgrade to a JB3 when I get back from vacation. lol
Since you're in Canada just send me a PM when you are ready and I will hook you up with the upgrade You won't be disappointed for sure...

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      07-31-2009, 08:53 PM   #8
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To be honest, JB+ at 100% on 94 Octane is pretty strong.
It's stronger than JB3 on Map 4 or 5 on 91 Octane.
It's probably very equal to JB3 on Map 4 or 5 on 93 Octane.
However, with 93-94 Octane you can run Map 6 or 7 on JB3.

That should give you about 10 rwhp/rwtq peak advantage over the JB+ at 100%
But you'll probably get closer to 15 rwhp more at 6500 rpms though.

I have not dyno tested the JB3 1.3 or 1.4 on 93 or 94 Octane.
I did dyno test JB3 1.2 on 93 Octane though.

Here's that graph.
**So you know, JB3 1.2 had a stronger top end than all versions of 1.3 of equal maps and I believe has every bit as strong (maybe a touch stronger) top end than 1.4 too.
1.2 was not quite as smooth as 1.3 or 1.4 though.

JB+ is a pretty strong off the shelf tune.
JB3 is surely stronger, especially up above 5500 rpms.

As you can see JB3 1.2 on Map 6 is stronger than the JB+ at 100% but not a huge amount.
I'd say JB3 1.4 on Map 4 with 93 octane would be slightly stronger than the JB+ at 100% on 93 octane, but it would be VERY CLOSE (within a few ponies up to 5500 rpms and then the Map 4 might be 5-6 rwhp more from 5500 to redline).

Bottom line, get the JB3. If you have access to 94 Octane you can run Map 6 or 7 which will give you 355-360 rwhp on an otherwise stock 335i.
But you won't get nearly enough to hang with a C6 LS3 Vette.
Those suckers trap 116-117 stock.

You need intake, exhaust, FMIC and 100 Octane and run Map 9 to hang with that (and even then past 120 the vette will probably still slowly pull away).
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