JB4 to BM3

anom3 · 05-29-2018, 12:57 PM

Not going to get a lot of solid technical info out of this post but I just wanted to share my experience going from a JB4 to BM3.

MUCH better.

I run a high flow cat (but not decatted, although 1.5 years later who knows how much of the cat is actually left) with a larger FMIC.

a) Much more predictable. As many have stated, the JB4 at times seamed so unpredictable. Engine warmed up, all the obvious conditions should be "checked" off, but it felt as though it was not even on. Yes I tried Maps 2 and 5. 2 seamed to be the most consistent.

b) MUCH better at lower RPM. It just works RIGHT from the get go. The JB4 seamed to have a specific RPM (2.5k+?) where it kicked on. The BM3 can be felt right from take off, even at slower speeds and lower RPMs.

c) I always had a sort of transmission slip on my first shift of the morning. It was very pronounced and ALWAYS there as I live in a heavily populated area and drive out nice and slow. The first 1 to 2 shift would hold for like 2+ seconds before popping over. This is now gone.

So there it is, a free, real user, advert for BM3

I was hesitant to make the buy as I am now well past the phase of modding the car. Besides an upgraded turbo, its pretty much maxed out so I didn't feel like dumping any more coin into it... But I am GLAD I did.

Don't hesitate, you will be happy

Jay_NYC · 05-29-2018, 02:08 PM

I read your post and then noticed you own an E92 M3. Why the post in the F30 forums?

Steakpizza · 05-29-2018, 03:40 PM

Someone told me that the BM3 voids any warranty! I plan on going JB4 until my warranty is up then switchin to BM3 if I can.

kern417 · 05-30-2018, 03:39 PM

Quote:

Originally Posted by Jay_NYC

I read your post and then noticed you own an E92 M3. Why the post in the F30 forums?

OP might have more than one car

I was posting on the X5 forums and someone asked me the same thing, then realized I hadn't added it to my profile yet. Not really that big of a deal.

Jay_NYC · 06-01-2018, 07:38 PM

Quote:

Originally Posted by kern417

OP might have more than one car

I was posting on the X5 forums and someone asked me the same thing, then realized I hadn't added it to my profile yet. Not really that big of a deal.

Yea definitely not a big deal. Just wanted a clarification before someone decides to buy BM3 based on a review from it installed on a different car.

anom3 · 06-02-2018, 08:13 AM

i used to own the e92 m3, just never updated my sig.

Quote:

Originally Posted by Jay_NYC

Yea definitely not a big deal. Just wanted a clarification before someone decides to buy BM3 based on a review from it installed on a different car.

Bmwman325 · 06-05-2018, 11:21 AM

Quote:

Originally Posted by Steakpizza

Someone told me that the BM3 voids any warranty! I plan on going JB4 until my warranty is up then switchin to BM3 if I can.

Both will.

_bdiddyb_ · 06-05-2018, 12:14 PM

anom3 , thx for that quick review. I've been on the JB4 for 4 months now, and it is as you stated. I'm on map1. Someday (warm,cool,or hot) it would run like a bat out of hell, other days, like a dog on a hot Sunday afternoon. I tried map5, waste of time. You know - the BMS Stage1 was more predictable, with consistent burbles. Which catted-downpipe do you have?

mike@x-ph.com · 06-05-2018, 03:41 PM

Congrats OP

Sea-Tac · 06-07-2018, 05:35 PM

Good product!

madmortar · 06-08-2018, 09:12 AM

Quote:

Originally Posted by Steakpizza

Someone told me that the BM3 voids any warranty! I plan on going JB4 until my warranty is up then switchin to BM3 if I can.

05-29-2018, 12:57 PM	#1
anom3 Captain 260 Rep 955 Posts Drives: F30 335ix Join Date: Apr 2014 Location: Behind the wheel iTrader: (0)	JB4 to BM3 - Thumbs up! Not going to get a lot of solid technical info out of this post but I just wanted to share my experience going from a JB4 to BM3. MUCH better. I run a high flow cat (but not decatted, although 1.5 years later who knows how much of the cat is actually left) with a larger FMIC. a) Much more predictable. As many have stated, the JB4 at times seamed so unpredictable. Engine warmed up, all the obvious conditions should be "checked" off, but it felt as though it was not even on. Yes I tried Maps 2 and 5. 2 seamed to be the most consistent. b) MUCH better at lower RPM. It just works RIGHT from the get go. The JB4 seamed to have a specific RPM (2.5k+?) where it kicked on. The BM3 can be felt right from take off, even at slower speeds and lower RPMs. c) I always had a sort of transmission slip on my first shift of the morning. It was very pronounced and ALWAYS there as I live in a heavily populated area and drive out nice and slow. The first 1 to 2 shift would hold for like 2+ seconds before popping over. This is now gone. So there it is, a free, real user, advert for BM3 I was hesitant to make the buy as I am now well past the phase of modding the car. Besides an upgraded turbo, its pretty much maxed out so I didn't feel like dumping any more coin into it... But I am GLAD I did. Don't hesitate, you will be happy
	Appreciate 1 kern4174449.50 Tweet Quote

05-29-2018, 02:08 PM	#2
Jay_NYC New Member 4 Rep 10 Posts Drives: 2013 335i Join Date: Jan 2017 Location: Queens, NYC iTrader: (0)	I read your post and then noticed you own an E92 M3. Why the post in the F30 forums?
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05-29-2018, 03:40 PM	#3
Steakpizza Second Lieutenant 118 Rep 293 Posts Drives: 320i Join Date: May 2018 Location: Philadelphia iTrader: (0)	Someone told me that the BM3 voids any warranty! I plan on going JB4 until my warranty is up then switchin to BM3 if I can.
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06-05-2018, 12:14 PM	#8
_bdiddyb_ Lieutenant 215 Rep 558 Posts Drives: 2013 335i Join Date: Aug 2013 Location: California iTrader: (1)	anom3 , thx for that quick review. I've been on the JB4 for 4 months now, and it is as you stated. I'm on map1. Someday (warm,cool,or hot) it would run like a bat out of hell, other days, like a dog on a hot Sunday afternoon. I tried map5, waste of time. You know - the BMS Stage1 was more predictable, with consistent burbles. Which catted-downpipe do you have?
	Appreciate 0 Quote

06-05-2018, 03:41 PM	#9
mike@x-ph.com BimmerPost Supporting Vendor 24199 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Congrats OP __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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06-07-2018, 05:35 PM	#10
Sea-Tac Major 1455 Rep 1,487 Posts Drives: 2108 X3 xDrive30i Join Date: Apr 2018 Location: Bellevue, Wa iTrader: (0) Garage List 2018 X3 xDrive30i [0.00] 2016 328i xDrive [0.00]	Good product!
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