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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > BMS Stage1 versus BMS JB4 Map1
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      04-15-2014, 09:53 PM   #1
rickinaz
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BMS Stage1 versus BMS JB4 Map1

When I compare the dyno sheets on their website, I glean the following:
  • BMS Stage1 ($379): bhp is up 30.5 (11%) vs stock; torque is up 50.3 ft-lbs (17%)
  • BMS JB4 Map1 ($529): bhp is up 34.4 (12%) vs stock; torque is up 43.1 ft-lbs (14%)

I am limited to 91 octane in Phoenix, so I would not be able to progress to JB4 Map2. BMS Stage1 seems torquier, which is what will register most on the butt dyno.

Am I missing something? Can I add a downpipe to either and free up more (albeit slightly) power?
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      04-16-2014, 03:40 PM   #2
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If you're adding a dp then get stage 2, otherwise I'd save a but and just go stage 1.

That is if you can use a map other than map 1. I don't think it's recommended to use map 2 without e85 or at least 93 with a dp.
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      04-16-2014, 03:55 PM   #3
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Map Info N55

Map 0: JB4 disabled
Map 1: Peak boost 12.5psi, suggest for most racing applications.
Map 2: Peak boost 14.0psi, suggested for those using exhaust mods and 93 RM2 octane or higher fuels
Map 3: Progressive methanol mapping
Map 4: Stock performance, JB4 on
Map 5: Currently under development
Map 6: User definable map. Suggested for troubleshooting by professionals only.
Map 7: Race gas map. Peak boost 18.5psi. Requires straight unleaded race gas.
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      04-16-2014, 06:15 PM   #4
rickinaz
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Actually, I hoping for answers to:

* If I'm limited to 91 octane, it appears that BMS Stage1 (the basic product) is marginally better than JB4Map1. Am I reading this correctly? Seems counter-intuitive.

* Even with BMS Stage1, use of a downpipe (per their dyno charts) increases power. In fact, it appears that a downpipe would even benefit a total stock (no tuner at all) turbo engine.
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      04-16-2014, 07:19 PM   #5
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Quote:
Originally Posted by rickinaz View Post
Actually, I hoping for answers to:

* If I'm limited to 91 octane, it appears that BMS Stage1 (the basic product) is marginally better than JB4Map1. Am I reading this correctly? Seems counter-intuitive.

* Even with BMS Stage1, use of a downpipe (per their dyno charts) increases power. In fact, it appears that a downpipe would even benefit a total stock (no tuner at all) turbo engine.
Point 1: You're comparing two different cars on different days (if I recall correctly). BMS has said Stage 2 offers more power even on map 1, but I suspect it's negligible. I had stage 1 then upgraded to stage 2 and honestly am not sure there was a seat of the pants difference. I dont believe Stage 1 would produce more power than Stage 2, at worst they'd be equal. Stage 1 is a straight 3 psi (maybe 3.5) boost from stock and map 1 of stage 2 is a slightly more controlled version of that as in it controls a bit more than just the boost.

Point 2: You are correct, even without a tune a DP will give you more power and better turbo response. This is more pronounced when you tune the car for more boost.
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      04-17-2014, 01:12 AM   #6
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Stage 2 handles boost mapping better so there is a lot less wheel spin down low, for me at least. I had a fairly early stage 1 model so it could be different now. There are other perks to stage 2 (code reading/clearing, logging, etc), but it also requires tapping wires which is a little disconcerting.
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      04-17-2014, 09:14 AM   #7
rickinaz
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But...I am still trying to get the answer to my first question regarding BMS Stage1 versus JB4 Map1. As I said, I don't have access to 91 octane so Stage2 is out of the question.
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      04-17-2014, 03:08 PM   #8
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I've got friends with Stage 1 and JB4 running Map 1. Hard to tell the difference with the butt dyno. Not sure I can to be honest. If my eyes were closed, it would be hard to tell.
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      04-17-2014, 03:54 PM   #9
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Quote:
Originally Posted by rickinaz View Post
But...I am still trying to get the answer to my first question regarding BMS Stage1 versus JB4 Map1. As I said, I don't have access to 91 octane so Stage2 is out of the question.
I already answered this for you. If you don't have access to 93, racing fuel, or e85. Get stage 1, simply put.
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      04-17-2014, 04:11 PM   #10
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I was confused by the use of the terms stage and map interchangeably (reread your reply). I now think that by Stage2, you actually meant Map2. Correct? Forgive me, I'm a newbie to the N55 having just come from the dark side (997S). The Porsche world does not have the same power-booster environment. We pay $15K for an X51 option that adds 26 bhp. Ouch.
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      04-17-2014, 04:49 PM   #11
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I run 93 Octane on a stage one and gained almost .5 on the 1/4 mile - that is what counts
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      04-17-2014, 05:06 PM   #12
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I emailed BMS this exact question a few weeks ago, here is Terry's direct response:

"JB4 map 1 is stronger than stage 1 by 15hp or so"

Hope that helps
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      04-17-2014, 05:13 PM   #13
rickinaz
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Quote:
Originally Posted by Cstyles View Post
I emailed BMS this exact question a few weeks ago, here is Terry's direct response:

"JB4 map 1 is stronger than stage 1 by 15hp or so"

Hope that helps
Yes - that helps a lot, and makes intuitive sense. Their dyno charts confuse the issue. The JB4 Map1 is indeed stronger by 15hp, but the baseline (stock engine) for the JB4 Map1 starts 15hp higher. So...the incremental change appears to be almost identical.
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      04-17-2014, 05:39 PM   #14
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Quote:
Originally Posted by rickinaz View Post
I was confused by the use of the terms stage and map interchangeably (reread your reply). I now think that by Stage2, you actually meant Map2. Correct? Forgive me, I'm a newbie to the N55 having just come from the dark side (997S). The Porsche world does not have the same power-booster environment. We pay $15K for an X51 option that adds 26 bhp. Ouch.
Stage 1 does not have maps, it's a set increase in boost over stock and isn't configurable.

Stage 2 is what people normally call the jb4 has multiple maps and can do logs and some customization for different mod set ups.

I did not mean map 2 of stage 2, I was speaking of map 1 since you said you didn't have access to higher octane gas so you'd only use map 1.

Get stage 1 for your needs as described. I think terry may have been taken out of context if he said map 1 of stage 2 is a 15hp increase over stage 1. They're too close to call with no mods on 91 octane. I don't think it's more than a 5 hp difference. Move to more mods, better fuel and change maps then yes the gap is significant but not without changing out of map 1 and using 91 octane.
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      04-17-2014, 06:15 PM   #15
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Quote:
Originally Posted by tdizzle View Post
They're too close to call with no mods on 91 octane. I don't think it's more than a 5 hp difference. Move to more mods, better fuel and change maps then yes the gap is significant but not without changing out of map 1 and using 91 octane.
That's what I thought. Thanks!
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