N54Tech.com - International Turbo Racing Discussion

N54Tech.com - International Turbo Racing Discussion (https://www.n54tech.com/forums/index.php)
-   N54 (https://www.n54tech.com/forums/forumdisplay.php?f=3)
-   -   JB4 anti-lag feature details & videos (https://www.n54tech.com/forums/showthread.php?t=33028)

omarmarji 08-26-2015 12:37 PM

will this have any negative effect on the motor/turbo? any risk ?

jdm5596 08-26-2015 12:51 PM

Ill be trying this as well. Going to make a run to get the materials

frmtl2_335i 08-26-2015 12:55 PM

Quote:

Originally Posted by Terry @ BMS (Post )
That should still work fine. We'll have to evaluate it. I'm also gravitating towards the brake pedal method for some technical and ease of implementation reasons. It's easier to use and easier to implement.

Brake pedal works best!!!!!
I mean haven't any of you guys brakeboost before????

ba114 08-26-2015 02:14 PM

nevermind

b00st3d 08-26-2015 03:43 PM

any chance that this gets ported over to the n55 platform?

The Leopard 08-26-2015 03:50 PM

Quote:

Originally Posted by b00st3d (Post )
any chance that this gets ported over to the n55 platform?

What's that?

Terry @ BMS 08-26-2015 03:57 PM

Quote:

Originally Posted by b00st3d (Post )
any chance that this gets ported over to the n55 platform?

No there are not sufficient flash tools for the N55 platform yet to allow this sort of more advanced stuff. :(

v8bait 08-26-2015 04:12 PM

Quote:

Originally Posted by str8shot (Post )
I'll beta test for you. Can we modify the JB4 back end flashes for MHD or are they locked somehow?

You can write anything you want as a jb4 backend, before it writes however the app patches the binary to max out at wgdc of 40%, which isn't an issue because you have a jb4 doing boost.

blisstik 08-26-2015 10:20 PM

Can we get some vids in action?

ba114 08-27-2015 12:00 AM

1 Attachment(s)
Terry, your xdfs appear to be defined in Celcius whereas the MHD xdfs and Fahrenheit .
I've attached the relevant table values and breakpoints based on the MHD xdfs.

Can you confirm?

b00st3d 08-27-2015 09:01 AM

Quote:

Originally Posted by The Leopard (Post )
What's that?

is this going to be an n54 only toy....or is the n55 going to get to play too? we would like anti-lag.
-signed n55 guys.

Terry @ BMS 08-27-2015 09:07 AM

Quote:

Originally Posted by ba114 (Post )
Terry, your xdfs appear to be defined in Celcius whereas the MHD xdfs and Fahrenheit .
I've attached the relevant table values and breakpoints based on the MHD xdfs.

Can you confirm?

Seems OK other than the RPM break points which I'll be using later to rebuild the normal IAT timing decay. Next time I'll post them using the hub XDFs.

Donnie and I are working on a few things for i8a0s which has some extra codes we need to disable, table changes, etc, for it to work fully problem free. But he was able to get a taste of it last night. I'll let him post his log. :)

Levan-i 08-27-2015 11:07 AM

so excited!

looking ahead for log

Dmac @ BMS/DMD 08-27-2015 11:32 AM

1 Attachment(s)
So needless to say, this is an AWESOME feature!

Built up lots of boost really quick while just lightly holding the brake. I used to have to hold the brake pedal all the way to the floor and would only build a fraction of the boost in the same amount of time. Car spun really bad in 3rd even with 555Rs so I short shifted in this log, but it should get the idea across.

Have a few minor things to work out, but this is going to help A LOT. Especially you single turbo users. ;)

My GoPro was dead last night while I was testing, but it's charged up today so I'll get a video later.

http://i1332.photobucket.com/albums/...psnrmn9dq5.png

omarmarji 08-27-2015 12:38 PM

Quote:

Originally Posted by Dmac @ BMS/DMD (Post )
So needless to say, this is an AWESOME feature!

Built up lots of boost really quick while just lightly holding the brake. I used to have to hold the brake pedal all the way to the floor and would only build a fraction of the boost in the same amount of time. Car spun really bad in 3rd even with 555Rs so I short shifted in this log, but it should get the idea across.

Have a few minor things to work out, but this is going to help A LOT. Especially you single turbo users. ;)

My GoPro was dead last night while I was testing, but it's charged up today so I'll get a video later.

http://i1332.photobucket.com/albums/...psnrmn9dq5.png


so you built about 18-20psi without glazing your rotors lol? all by this new feature ?

rhm135 08-27-2015 12:42 PM

Will this work on a DCT 335is? Or is this just for the auto guys?

Dmac @ BMS/DMD 08-27-2015 01:06 PM

Quote:

Originally Posted by omarmarji (Post )
so you built about 18-20psi without glazing your rotors lol? all by this new feature ?

Yep. :) I was only on the brake pedal about 30-50%.

PR3CI5N335i 08-27-2015 01:59 PM

Nice to see some results. My buddy just finished making me this anti-lag device and I'll be installing it later tonight to test :burnrubber:

andydna15 08-27-2015 02:00 PM

Ok I was able to make one today.

VegasJD 08-27-2015 02:25 PM

Quote:

Originally Posted by b00st3d (Post )
is this going to be an n54 only toy....or is the n55 going to get to play too? we would like anti-lag.
-signed n55 guys.

i 2nd that i was hoping to get it too;)

omarmarji 08-27-2015 03:52 PM

Aside from making the wires for it, what else is needed ?

amsnow440 08-27-2015 03:59 PM

will this have any funky effects when heel-toe downshifting?

Dmac @ BMS/DMD 08-27-2015 06:57 PM

2 Attachment(s)
Went out and did some more testing to show some friends this anti-lag setup. Video for those interested.



Logs attached. Forgot to start the second one before going WOT though.

musc 08-27-2015 08:07 PM

Quote:

Originally Posted by rhm135 (Post )
Will this work on a DCT 335is? Or is this just for the auto guys?

Good question. When I have tried brake boosting in the past the DCT did not like it and and I ended up throwing some throttle valve codes. Would be cool if this works though.

Terry @ BMS 08-27-2015 09:01 PM

1 Attachment(s)
That video of this in action makes me drool! lol.

We found a little bug we need to work around. Note here at the end of the run IAT is at 140 degrees. When you tap the brake the circuit kicks on and drops temp to 90, and it triggers a 2F09 fault. It's another plausibility fault like 2F0C. But unlike 2F0C this one triggers a 3100 fault we can't seem to disable.

When the JB4 is running the system more intelligently it should be easy to work around. Until then Donnie and I are going to test some circuit modifications to work around it physically. I'll also start working on revised 23k22 firmware that deletes CPS and replaces it with two programmable PWM outputs that we can use to trigger this setup.


All times are GMT -7. The time now is 08:27 AM.


Copyright 2007 - 2020, N54tech.com