[MasterWang]

I found this on the Jb4 command list, but not sure what it does.
I tried looking it up, but couldn't find any information about it.

Does anyone have any experience with this function?
What does it do exactly?

[2Times]

Probably like with Cobb, they have Stock Throttle vs Linear Throttle maps. LT always made my car feel slow but several people like it.

[iturbo_bmw]

hhm interesting. i didn't notice this was changed. previously it was ignore dme boost or something. maybe it does the same thing?

[Indo Rider]

Originally Posted by iturbo_bmw

hhm interesting. i didn't notice this was changed. previously it was ignore dme boost or something. maybe it does the same thing?

OK, good, thought I was going crazy... No way it should be the same thing because I only set it to ignore DME target recently and it definitely does that as evidenced by the car not boosting over 8psi before it warms up even though I'm running the E85 backend flash.... Wonder if Terry snuck in some changes without changing firmware filename or what. Need to post over on Terry's forum to get to the bottom of this.

I downloaded the dash commands file on March13 and is says ignore DME boost target. Can't find a link to the .xls file today...

[Mike@N54Tuning.com]

By default the JB4 will give you the higher of the factory boost target and the JB4 boost target. When adding a back end flash if the flash is a "high load" flash, meaning greater than factory boost targets, then you get that boost happy flash tune gas pedal mapping along with it. For those that find it unsettling the 4/2 option allows you to ignore the DME boost target all together and always run the JB4 boost target which is linearly mapped to gas pedal input.

Mike

[Iceberg3232]

Originally Posted by Mike@N54Tuning.com

By default the JB4 will give you the higher of the factory boost target and the JB4 boost target. When adding a back end flash if the flash is a "high load" flash, meaning greater than factory boost targets, then you get that boost happy flash tune gas pedal mapping along with it. For those that find it unsettling the 4/2 option allows you to ignore the DME boost target all together and always run the JB4 boost target which is linearly mapped to gas pedal input.

Mike

+1. 4-2 FTW.

[Indo Rider]

Originally Posted by Mike@N54Tuning.com

By default the JB4 will give you the higher of the factory boost target and the JB4 boost target. When adding a back end flash if the flash is a "high load" flash, meaning greater than factory boost targets, then you get that boost happy flash tune gas pedal mapping along with it. For those that find it unsettling the 4/2 option allows you to ignore the DME boost target all together and always run the JB4 boost target which is linearly mapped to gas pedal input.

Mike

Thanks. That makes sense I suppose. Combined with all the other weird things since the CARB incident I was running in conspiracy theory mode.

[Rotary Rasp]

wow, all I can say is wow.

The car is soooooo much smoother under heavy partial throttle acceleration now. Night and day difference!

Thanks!

[tc535i]

is this for the standard backend flash, or something more aggressive? I'm going to do the basic backend in a month so I can run a nice e85 mix, will this be something I'll want to adjust at the same time to maintain driveability?

[Rotary Rasp]

My car was jerky under partial throttle (60-70%) even before I got the backend flash.

Originally Posted by tc535i

is this for the standard backend flash, or something more aggressive? I'm going to do the basic backend in a month so I can run a nice e85 mix, will this be something I'll want to adjust at the same time to maintain driveability?

[rborane]

So with the pump gas backend or race backend, do you set 4-2 or 4-3??? Im confused