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      03-11-2012, 03:06 PM   #1
Ktm.Moto
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Smile My JB4 Experience

Hey guys, so I know there are threads everywhere on this site about reviews and comparisons, but I just wanted to share my experience.

I bought my 335 a month ago to this day actually and instantly fell in love with it. Coming from a G35 coupe, this car felt like a beast. I instantly got bit by the mod bug and started looking for things to do. Got my DCI right away and started making a list for what to do next. I knew I wanted a tune but I was stuck on Cobb for ease of install. After looking at this forum for hours on end each day, I came across a JB4 PnP for a great price and decided to just go with it.

I was nervous about the install even though people told me it was easy. Well, I really shouldn't have been. The install wasn't bad at all. Took a little over an hour, but that was mostly because I had a hard time getting the clips off the ECU. As for actually installing the JB4, piece of cake!

After getting it installed, I took it out for a ride on Map 5. HOLY CRAP! This thing is ridiculous. I was expecting a difference but nothing this big.

So I guess the moral of the story is if your worried about getting a JB4 vs Cobb for install purposes, don't be! I was the same way, but don't regret it all. The functions on the JB4 are fantastic and the tune is great. I can't speak for the Cobb, but I have heard it is also an awesome tune. So this isn't a comparison telling you which one is better, but rather some input from someone who was on the fence purely for install reasons.
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      03-11-2012, 05:30 PM   #2
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Congrats.. Yup install is realli easy i can do it start to finish in 15 believe it or not..

And u get all the great features and in Dash commands that u dont get with the cobb flash, ur gonna love it!
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      03-11-2012, 05:34 PM   #3
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Nice write up. My story is gonna sound a lot like yours in about a week when I do my install

Cnt wait!
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      03-11-2012, 07:48 PM   #4
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Thanks guys. Still not sure whether to run map 1 or map 5. Seems like there are a lot who think one is better than the other.
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      03-11-2012, 07:55 PM   #5
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Quote:
Originally Posted by Ktm.Moto
Thanks guys. Still not sure whether to run map 1 or map 5. Seems like there are a lot who think one is better than the other.
Well map one is when you're completely stock. I would assume its more of a generic tune. Map 5 tunes to what you have on the car...so if you just have an intake(getting more air or colder air) I'm assuming map 5 would be a better choice cuz it'll regulate fuel to match that air, fix AFR's with the DME and essentially make more power?

Well at least that kinda sounds like common sense...but what do I know hahaha
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      03-11-2012, 07:56 PM   #6
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Quote:
Originally Posted by Ktm.Moto
Thanks guys. Still not sure whether to run map 1 or map 5. Seems like there are a lot who think one is better than the other.
Every car will feel different on Map 1 vs Map 5...at least from my experience and others as well...

Try both maps and keep it on the one you feel is better...for me Map 5 was a lot smoother but your results may vary..
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      03-11-2012, 08:02 PM   #7
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Map 5 should be fine for you, since it auto tunes to whatever mods you have...
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      03-11-2012, 08:23 PM   #8
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Thanks for the help guys, I'll probably just leave it on map 5 since it seems to be running great. Now I need to get some DP's and and FMIC, but I'm too scared to go FBO with warranty.
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      03-11-2012, 08:34 PM   #9
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Quote:
Originally Posted by Ktm.Moto
Thanks for the help guys, I'll probably just leave it on map 5 since it seems to be running great. Now I need to get some DP's and and FMIC, but I'm too scared to go FBO with warranty.
With dci dps and intercooller, the car will be a beast, (that is fbo btw lol exhaust doesnt do much)
Imo, you should do meth over fmic...
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      03-11-2012, 09:19 PM   #10
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How is the reliability of meth? To be completely honest, I really don't know much about it at all. I'll have to look into it.
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      03-11-2012, 09:36 PM   #11
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How is the reliability of meth? To be completely honest, I really don't know much about it at all. I'll have to look into it.
It runs more octane, so the car is less likely to knock. It also helps cool down the engine by having lower iats.

I would do that over fmic, because it gives more power and similar benefits.
But look into it and see whats best for you.
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      03-12-2012, 10:14 AM   #12
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Yeah I will definitely look into, thanks!
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      03-12-2012, 10:24 AM   #13
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Quote:
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With dci dps and intercooller, the car will be a beast, (that is fbo btw lol exhaust doesnt do much)
Imo, you should do meth over fmic...
Beyond a doubt, meth is your next biggest bang for the buck. Downpipes and intercooler will bring marginal benefit. With the ability to run higher boost safely, meth will bring you 40+ HP gains.
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      03-12-2012, 11:10 AM   #14
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Beyond a doubt, meth is your next biggest bang for the buck. Downpipes and intercooler will bring marginal benefit. With the ability to run higher boost safely, meth will bring you 40+ HP gains.
Hey Hotrod, which meth kit were you running?
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      03-12-2012, 12:56 PM   #15
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Hey Hotrod, which meth kit were you running?
I had the basic Coolingmist/BMS trunk mount kit with the JB4 FSB controlling it.
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      03-12-2012, 03:41 PM   #16
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Congrats... I came from a fbo 350Z. Big difference! My 335i stock would probably walk around my modded Z and now that it's modded, my Z could have never came close to this without spending" thousands of thousands" of dollar on a turbo kit.
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      03-13-2012, 01:31 AM   #17
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Thanks for the write up. I came from an 06 g35 coupe as well. Just pickeed up my e92 335I (big difference from the g35) a few weeks ago was a little worried about breaking into the ecu for the JB4 install. This makes me feel a little better about the install and it will be going on soon. BTW, I see your car is an 07 as well. How many miles do you have on it and were there any negative effects with the jb4, ie misfires??
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      03-13-2012, 08:05 AM   #18
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My e90 has 56k miles on it and so far so good. Running just as good as it was stock. I'll keep you updated if anything changes!

Btw, good luck with the install. You're going to LOVE it
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Last edited by Ktm.Moto; 03-13-2012 at 08:10 AM.
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      03-13-2012, 01:04 PM   #19
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That's what I was hoping to hear!! I'm at 46k so I'm gonna change the plugs, install it, and hope for the best. Yea, please keep me updated with anything problems or any maps you find work best. Like I said, I'll be getting mine in a coupkle weeks so any info is greatly appreciated.
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      03-13-2012, 02:44 PM   #20
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Quote:
Originally Posted by Ktm.Moto View Post
After getting it installed, I took it out for a ride on Map 5. HOLY CRAP! This thing is ridiculous. I was expecting a difference but nothing this big.
Love the quote

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      03-13-2012, 02:59 PM   #21
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That's what I was hoping to hear!! I'm at 46k so I'm gonna change the plugs, install it, and hope for the best. Yea, please keep me updated with anything problems or any maps you find work best. Like I said, I'll be getting mine in a coupkle weeks so any info is greatly appreciated.
Will do. You're going to wonder what it would be like with FMIC+DP and meth. I can't get it off my mind...the mod bug sucks!....actually, I take that back. Love the mod bug

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Love the quote

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      03-13-2012, 05:41 PM   #22
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Haha, yea was planning on stopping with DCI and JB4 but something tells me I won't stop there!
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