[bmw_hub]

This weekend I installed JB4 to my '11 335i Xdrive. Im pleased with results however I'm unsure of which map is the best map, the car feels faster with Map 2 as opposed to map 1 however, is running map 2 safe without DPs? I also have a vrsf charge pipe and bms intake.

[mike@x-ph.com]

It is recommended that you have downpipes with map 2.
If you want to run map 2 without downpipes, i strongly recommend logging to make sure car is reacting well to the extra power

[bmw_hub]

What could be the consequences of running map 2 w/o DPs

[mike@x-ph.com]

Originally Posted by bmw_hub

What could be the consequences of running map 2 w/o DPs

Most common would be blown turbo

[bmw_hub]

In that case, would it really be worth investing in a downpipe? It would have to be catted such as a wagner or a cobb since I don't want to deal with emissions and ESPECIALLY the smell!

[mike@x-ph.com]

Originally Posted by bmw_hub

In that case, would it really be worth investing in a downpipe? It would have to be catted such as a wagner or a cobb since I don't want to deal with emissions and ESPECIALLY the smell!

Getting catted DP will not guarantee that you are going to pass inspection.
Sounds like you are better off staying with map 1 and stock DP

Note: Catless DP smell is overrated. I personally would get catless DP because of all the increase in power and sounds that it offers

[jgoens]

Originally Posted by mike@x-ph.com

Most common would be blown turbo

How will it blow a turbo on map 2 when map 5 can be used on stock and is supposed to deliver higher boost?

[mike@x-ph.com]

Originally Posted by jgoens

How will it blow a turbo on map 2 when map 5 can be used on stock and is supposed to deliver higher boost?

Map 5 does not always provide higher boost target than map 2. Map 5 will target boost t that the jb4 sees as appropriate for your mods and fuel .

[Mike@N54Tuning.com]

Originally Posted by bmw_hub

This weekend I installed JB4 to my '11 335i Xdrive. Im pleased with results however I'm unsure of which map is the best map, the car feels faster with Map 2 as opposed to map 1 however, is running map 2 safe without DPs? I also have a vrsf charge pipe and bms intake.

Maps:

Map 0: JB4 disabled.
Map 1: 12.5psi. Suggested for most racing applications.
Map 2: 14psi. Suggested for those with a high flow exhaust and 93 RM2 or higher octane.
Map 3: Progressive meth mapping with flow sensor failsafe. Refer to BMS meth installation PDF for setup directions.
Map 4: Stock map w/ CAN active.
Map 5: Autotuning. Adjusts boost curve from 11psi peak to 16psi peak based on octane, mods, climate, etc. For those running E85 fuels up to a 40% mix can be used along with the flex fuel add on connector.
Map 6: Custom tuning map.
Map 7: 16psi race gas map. 100+ RM2 octane race gas required.

[mike@x-ph.com]

jgoens
As Mike mentioned above
Map 5: Autotuning. Adjusts boost curve from 11psi peak to 16psi peak based on octane, mods, climate, etc. For those running E85 fuels up to a 40% mix can be used along with the flex fuel add on connector.

If your car is stock and you are using 91 or 93, JB4 is probably targeting similar boost as map 1

[n55e90]

I've been running on map 2 for the past 2 weeks but just last night i tried map 5 and it ran better. it was holding 14psi map 2 was only holding about 12 or 13psi. i run 93 pump gas. with just a intake.

[mike@x-ph.com]

Originally Posted by n55e90

I've been running on map 2 for the past 2 weeks but just last night i tried map 5 and it ran better. it was holding 14psi map 2 was only holding about 12 or 13psi. i run 93 pump gas. with just a intake.

Map 5 is the best in my opinion for daily driving. The only problem i find is that power is not consistent.

[drmdvl]

I would highly recommend a catless DP if it's something you are considering. I too have XDrive, you will not notice the smell since we have mid cats. Definitely my favorite mod

[bmw_hub]

Originally Posted by drmdvl

I would highly recommend a catless DP if it's something you are considering. I too have XDrive, you will not notice the smell since we have mid cats. Definitely my favorite mod

Yes, however I want the bmw performance exhaust which don't have secondary cats, and then I will smell it, so maybe I should just keep the exhaust stock, and go for VRSF dps

[Mike@N54Tuning.com]

Originally Posted by bmw_hub

Yes, however I want the bmw performance exhaust which don't have secondary cats, and then I will smell it, so maybe I should just keep the exhaust stock, and go for VRSF dps

Catless downpipes with stock exhaust are a great combo!

Mike

[mike@x-ph.com]

^^ Agree

I have been running that set up ( catless DP + stock exhaust ) for 3 years

bmw_hub Start with getting catless DP, and if you are still looking for a louder sound we can discuss exhausts

[bmw_hub]

Originally Posted by mike@x-ph.com

^^ Agree

I have been running that set up ( catless DP + stock exhaust ) for 3 years

bmw_hub Start with getting catless DP, and if you are still looking for a louder sound we can discuss exhausts

How do you pass emissions?

[Dhillon92]

Catless dp has real gains and a sound increase, whereas the PE is just sound, and very minimal gain.

Emissions is sacrificed. I'm running catless dp and stock exhaust with mid cats, debating to remove those as well, maybe replace them with resonators.

[Jeff@TopGearSolutions]

OK so to clear up some erroneous remarks.

The problem with map 2 without downpipes would be running too much boost and potentially too much ignition timing for your modification or lack there of. As a result you can potentially be riding the knock sensor, have excessive timing correction and consequently inconsistent performance.

If you were to run race gas or some e85 you could get away with map 2.

The first step is logging your vehicle as conditions are a factor too.

If you are on 91 octane I would not recommend map 2 without downpipes, period.

On 93 octane with a few gallons of e85, you should be fine.

Also with map 2 on stock downpipes, you have excessive back pressure in the exhaust so egt's will be elevated. This kind of falls back to the whole timing correction and inconsistent performance as well as running everything hot.

Is this issue a little exaggerated, perhaps. The moral of the story, run the right map for your mods or deal with potential consequences of not.

I'm more then happy to educate should there be any further questions.

If you wanted to skip downpipes and go with a fmic, I'd feel more comfortable recommending map 2 with at least an fmic.

Your turbos would be happy as well as your engine going at least that route.

[Turbod]

[QUOTE=Mike@N54Tuning.com;18547301]Maps:

Map 5: Autotuning. Adjusts boost curve from 11psi peak to 16psi peak based on octane, mods, climate, etc. For those running E85 fuels up to a 40% mix can be used along with the flex fuel add on connector.

I have seen Map 5 target 18.2 once but more consistently mid to high 17's. I don't know if Terry made any changes since that map guide was made.

[jgoens]

Originally Posted by Jeff@TopGearSolutions

OK so to clear up some erroneous remarks.

The problem with map 2 without downpipes would be running too much boost and potentially too much ignition timing for your modification or lack there of. As a result you can potentially be riding the knock sensor, have excessive timing correction and consequently inconsistent performance.

If you were to run race gas or some e85 you could get away with map 2.

The first step is logging your vehicle as conditions are a factor too.

If you are on 91 octane I would not recommend map 2 without downpipes, period.

On 93 octane with a few gallons of e85, you should be fine.

Also with map 2 on stock downpipes, you have excessive back pressure in the exhaust so egt's will be elevated. This kind of falls back to the whole timing correction and inconsistent performance as well as running everything hot.

Is this issue a little exaggerated, perhaps. The moral of the story, run the right map for your mods or deal with potential consequences of not.

I'm more then happy to educate should there be any further questions.

If you wanted to skip downpipes and go with a fmic, I'd feel more comfortable recommending map 2 with at least an fmic.

Your turbos would be happy as well as your engine going at least that route.

Thanks for the explanation...makes sense
So what about map 5? Higher boost here? Why is that better for otherwise stock than map 2?

[dannyle27]

Can you run map 2 with intercooler and downpipe with 91 gas?