dual fuel disables ign map 3 and trans brake stays active

Testing and development of Megasquirt 3

Moderators: jsmcortina, muythaibxr

Post Reply
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

dual fuel disables ign map 3 and trans brake stays active

Post by 93supercoupe »

I had my car on the dyno this weekend on ethanol and noticed something wierd.

I enabled dual fuel based of flex so i can have a different accel enrichment table. When i did this, it disables my ignition map 3, even though alternate ignition maps is set to Off but still referenced it in the log (luckily). The fuel maps arent effected until you turn on alternate fuel maps.

Also, when using the trans brake function, with the input pin set to "same as launch", the trans brake is still active above the shut off MPH in the launch settings. This is incredibly dangerous.

Ill update the post with a MSQ and log in a bit, but i will not have a log capturing the transbrake issue.

In other news, the car did great. Made 775 on 24ish PSI with soft soft timing on a mustang dyno.

6.0LS
Twin turbo
Turbo 400 trans
MS3 Ultimate

Edited for more info
Last edited by 93supercoupe on Mon May 22, 2017 5:35 pm, edited 1 time in total.
BootlegTuned
nathaninwa
Super MS/Extra'er
Posts: 2637
Joined: Tue Sep 14, 2004 4:17 pm
Location: Aberdeen, Wa

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by nathaninwa »

May I ask how you found out about the trans brake? I posted about this before and have been meaning to unhook my brake and put a test light on the output and see what happens. My brake and bump are steering wheel mounted
Volvo 940, 2jzge, MS3Pro, daily
240Z, 2JZ, MS3Pro boost control
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

Because i accidentally hit the button driving down the road and it began to lock up. For whatever reason it wasnt instant and i felt the car begin the slow down and i let go. Im sure my transmission wasnt happy.
BootlegTuned
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

updated with tune and MSQ although the dual fuel and transbrake is turned off, but turning them on with the current settings inside would yield my results
BootlegTuned
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by jsmcortina »

93supercoupe wrote:Also, when using the trans brake function, with the input pin set to "same as launch", the trans brake is still active above the shut off MPH in the launch settings.
That's the launch settings, they aren't linked.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by jsmcortina »

93supercoupe wrote:I enabled dual fuel based of flex so i can have a different accel enrichment table. When i did this, it disables my ignition map 3, even though alternate ignition maps is set to Off but still referenced it in the log (luckily).
Is this in the MSQ you posted? I don't seem to be seeing it.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

Yea, this MSQ. In the tune posted "dual fuel" is off because i needed to continue to tune the car, but simply turning it on will disable ign map 3 (even with out turning on alternate ignition)

Ill post a screen shot
BootlegTuned
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

Screen shots
BootlegTuned
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

Is this a glitch or this intended?

Also, should i make a new thread about the trans brake? That seems pretty obvious that it should shut off above a certian VSS
BootlegTuned
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by jsmcortina »

93supercoupe wrote:Is this a glitch or this intended?
It is a greying error corrected for the next beta.
Also, should i make a new thread about the trans brake? That seems pretty obvious that it should shut off above a certian VSS
Nobody else has mentioned this before. Surely you'd have the same issue with a regular standalone transbrake ?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

jsmcortina wrote: Nobody else has mentioned this before. Surely you'd have the same issue with a regular standalone transbrake ?

James
Surely i would, but hardly a reason to not have a vss based shut off for a device that could stop you dead in your tracks at speed.

And great news on the greying error fix!
BootlegTuned
nathaninwa
Super MS/Extra'er
Posts: 2637
Joined: Tue Sep 14, 2004 4:17 pm
Location: Aberdeen, Wa

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by nathaninwa »

There was this thread here where I meant to get some data, but have been dealing with a boost creep issue since the car got on the road I forgot about it

http://www.msextra.com/forums/viewtopic ... ilit=Trans
Volvo 940, 2jzge, MS3Pro, daily
240Z, 2JZ, MS3Pro boost control
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by jsmcortina »

For the next beta, transbrake will only activate at very low speeds (< 1ms-1)

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
nathaninwa
Super MS/Extra'er
Posts: 2637
Joined: Tue Sep 14, 2004 4:17 pm
Location: Aberdeen, Wa

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by nathaninwa »

Thankyou James
Volvo 940, 2jzge, MS3Pro, daily
240Z, 2JZ, MS3Pro boost control
93supercoupe
Master MS/Extra'er
Posts: 581
Joined: Sat May 10, 2014 4:57 am
Location: New Haven, Ct, USA

Re: dual fuel disables ign map 3 and trans brake stays activ

Post by 93supercoupe »

Fantastic.

Is it worth just having it use the Launch settings when "same as input" is selected for the input?

Or maybe just a user defined VSS?
BootlegTuned
Post Reply