Does the JB4 map2 really require exhaust mods?

[rezilient]

Just wondering if anyone knows what the JB4 map2 actually requires, the documentation just says exhaust modifications (like dp) but what I've been reading that those dont make a huge difference anyway since the stock M4 exhaust is already pretty effective. Just wondering if i can try map2 so i can compare to the map1 that im running now, or if i should wait. Thanks.

[mike@x-ph.com]

Originally Posted by rezilient

Just wondering if anyone knows what the JB4 map2 actually requires, the documentation just says exhaust modifications (like dp) but what I've been reading that those dont make a huge difference anyway since the stock M4 exhaust is already pretty effective. Just wondering if i can try map2 so i can compare to the map1 that im running now, or if i should wait. Thanks.

BMS removed this requirement from their latest map guide

JB4_S55 Map Guide as of v1_8_4 firmware:

Map 0: Disable JB4 / Full Pass Through Mode
Map 1: Stage1 map adding approximately 40whp and 40wtq across the power band on pump gas. Suitable for all stages and fuel mixtures.
Map 2: Slightly more aggressive version of map 1 intended for vehicles with bolt on modifications and 93+ octane fuel. Can also be used with E85 and racing fuel mixtures. Fuel pressure connector suggested.
Map 3: Slightly less aggressive version of map 1 intended for vehicles running on lower grade fuels such as 91 octane.
Map 4: Low boost / VALET / Safety Map
Map 5: //M low torque ramp power up to redline
Map 6: User defined map generally only used for diagnostics or troubleshooting.
Map 7: Race gas map. Requires 100 octane unleaded fuel and for the fuel mass connector to be installed. Can be used with or without the EWG connectors but will make more power with the EWG connectors installed. This map can also be used with up to 35% E85 but in some vehicles & conditions this may cause a high fuel pressure drop and resulting stuttering. If this occurs drop down to map 2.
Map 8: WMI map. Requires FSB controller for progressive mapping and safety systems. For pump gas a meth additive of 30-40 is suggested while for race gas/E85 + meth up to a 75 additive can be used. The higher the meth additive the more aggressive the boost curve. A meth additive of 60 would be roughly equivalent to map 7.

[Marioec]

Originally Posted by mike@x-ph.com

BMS removed this requirement from their latest map guide

JB4_S55 Map Guide as of v1_8_4 firmware:

Map 0: Disable JB4 / Full Pass Through Mode
Map 1: Stage1 map adding approximately 40whp and 40wtq across the power band on pump gas. Suitable for all stages and fuel mixtures.
Map 2: Slightly more aggressive version of map 1 intended for vehicles with bolt on modifications and 93+ octane fuel. Can also be used with E85 and racing fuel mixtures. Fuel pressure connector suggested.
Map 3: Slightly less aggressive version of map 1 intended for vehicles running on lower grade fuels such as 91 octane.
Map 4: Low boost / VALET / Safety Map
Map 5: //M low torque ramp power up to redline
Map 6: User defined map generally only used for diagnostics or troubleshooting.
Map 7: Race gas map. Requires 100 octane unleaded fuel and for the fuel mass connector to be installed. Can be used with or without the EWG connectors but will make more power with the EWG connectors installed. This map can also be used with up to 35% E85 but in some vehicles & conditions this may cause a high fuel pressure drop and resulting stuttering. If this occurs drop down to map 2.
Map 8: WMI map. Requires FSB controller for progressive mapping and safety systems. For pump gas a meth additive of 30-40 is suggested while for race gas/E85 + meth up to a 75 additive can be used. The higher the meth additive the more aggressive the boost curve. A meth additive of 60 would be roughly equivalent to map 7.

Those that mean I could run Map 2 with 93 octane and no DP without any problems ? occasionally adding 3 to 4 gal of e85 when available. I do have AA EL Mid pipes on my ZCP and K&N drop in air filters with charcol filters removed.

I always thought DP was a most with Map 2 according to BMS but some people do it without DP .... When did BMS removed this requirement ?

[mike@x-ph.com]

Originally Posted by Marioec

Those that mean I could run Map 2 with 93 octane and no DP without any problems ? occasionally adding 3 to 4 gal of e85 when available. I do have AA EL Mid pipes on my ZCP and K&N drop in air filters with charcol filters removed.

I always thought DP was a most with Map 2 according to BMS but some people do it without DP .... When did BMS removed this requirement ?

BMS intentionally do not mention downpipes on any of their sites.

Bolt-on modifications means downpipes, charge pipes

[Marioec]

Originally Posted by mike@x-ph.com

BMS intentionally do not mention downpipes on any of their sites.

Bolt-on modifications means downpipes, charge pipes

But could I run Map 2 with 93 octane and no DP without any problems ? occasionally adding 3 to 4 gal of e85 when available. I do have AA El mid pipes though

[mike@x-ph.com]

Originally Posted by Marioec

But could I run Map 2 with 93 octane and no DP without any problems ? occasionally adding 3 to 4 gal of e85 when available. I do have AA El mid pipes though

its not recommended but a lot of people run it anyways and they show clean logs

[Marioec]

Originally Posted by mike@x-ph.com

its not recommended but a lot of people run it anyways and they show clean logs

Thats what I wanted to hear. I'm going to give it a try and post the logs for review. I would hate to do DP I HATE THE SMELL !!!

Thanks !!!

[Info@mad-us.com]

Originally Posted by Marioec

Thats what I wanted to hear. I'm going to give it a try and post the logs for review. I would hate to do DP I HATE THE SMELL !!!

Thanks !!!

Could go with our Dp's.



https://mad-us.com/mad-bmw-s55-catte...-flex-section/

[Marioec]

Originally Posted by Info@mad-us.com

Could go with our Dp's.



https://mad-us.com/mad-bmw-s55-catte...-flex-section/

Any dyno graphs

[Info@mad-us.com]

Originally Posted by Marioec

Any dyno graphs

No dyno at the moment.

[Marioec]

Originally Posted by Info@mad-us.com

No dyno at the moment.

You should get some Dyno # It will help knowing how much more flow they have compared to stock DP

[rezilient]

Originally Posted by Info@mad-us.com

No dyno at the moment.

What's the difference between your "fat boy" and normal DPs for the S55? Does the fat boy work with stock exhaust? Is that one available for immediate shipping? Any discount for board members? thx

[Info@mad-us.com]

Originally Posted by rezilient

What's the difference between your "fat boy" and normal DPs for the S55? Does the fat boy work with stock exhaust? Is that one available for immediate shipping? Any discount for board members? thx

The diameter is 3.5 instead of 3 inch. Yes the flanges are oem size will connect to factory exhaust and aftermarket as well.

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