Author Topic: Starting issue Cold or Hot.  (Read 7856 times)

Offline Tony C

  • Hero Member
  • *****
  • Posts: 650
  • BHP: 8
    • Capriracing
Starting issue Cold or Hot.
« on: October 27, 2009, 01:47:23 am »
just got a few bugs i need help ironing out,
Cant keep bothering poor dave via email.  ::)

when you try to start the car when cold if you dont touch the throttle it just cranks over and over and over, it may cough a few times but you also get a pop in the intake or exhaust every so often,
if you floor it it dont do anything,
but i tried feathering the throttle lightly on the 4th attempt this evening and it seemed to help and it fired near on instantly while lightly feathering the throttle,
when hot you have to crank it over a few times to, but it will cough a few times as above with the pop but will then fire and then run,

im running 1.1.44 firmware

any ideas?
Engine is stg3 high comp (around 10.5:1cr) 4.6 v8 with stg3 heads and a crower high lift cam,
Dave has done a sterling job getting the ecu repaired and the car to run,
just need help ironing a few things out,
Have the latest MSQ and datalog of the cold starting tonight if you want it posting up?

Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74

Offline MWfire

  • Hero Member
  • *****
  • Posts: 721
  • BHP: 35
Re: Starting issue Cold or Hot.
« Reply #1 on: October 27, 2009, 02:56:17 am »
Post you msq and i will send new msq.

Offline Tony C

  • Hero Member
  • *****
  • Posts: 650
  • BHP: 8
    • Capriracing
Re: Starting issue Cold or Hot.
« Reply #2 on: October 27, 2009, 04:10:19 am »
email sent ,
thanks.

Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74

Offline MWfire

  • Hero Member
  • *****
  • Posts: 721
  • BHP: 35
Re: Starting issue Cold or Hot.
« Reply #3 on: October 27, 2009, 04:37:14 am »
Sent back.

Offline Tony C

  • Hero Member
  • *****
  • Posts: 650
  • BHP: 8
    • Capriracing
Re: Starting issue Cold or Hot.
« Reply #4 on: October 28, 2009, 01:08:14 am »
wow
it started within a few seconds of cranking when cold. and it idled reasonable too,
didnt like it when hot though,
have sent you the cold and hot start datalogs from tonight mate along with the msq,

Thanks for the help,

Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74

Offline Tony C

  • Hero Member
  • *****
  • Posts: 650
  • BHP: 8
    • Capriracing
Re: Starting issue Cold or Hot.
« Reply #5 on: December 04, 2009, 11:05:09 pm »
thought i should update this post as MWfire has done a cracking job off forum assisting in getting the car starting from hot/cold,
starts a treat only prob i need help with is, while cranking from cold, if it does not catch and you need to crank it over again im getting terrible kick back from the engine as if its locking up,
its fine when hot,
any ideas? is it somethimng to do with the cold settings?

Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74

Offline rob@vems.co.uk

  • Hero Member
  • *****
  • Posts: 3115
  • BHP: 49
    • VEMS Forum
Re: Starting issue Cold or Hot.
« Reply #6 on: December 06, 2009, 12:24:29 am »
I'm betting cranking advance on that one, what's it set at currently?
I've seen 4deg on cranking before.

Rob

Offline Tony C

  • Hero Member
  • *****
  • Posts: 650
  • BHP: 8
    • Capriracing
Re: Starting issue Cold or Hot.
« Reply #7 on: December 06, 2009, 12:46:14 am »
Hi Rob,
its set at 7.00deg mate,

Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74

Offline Sprocket

  • Hero Member
  • *****
  • Posts: 867
  • BHP: 29
Re: Starting issue Cold or Hot.
« Reply #8 on: December 06, 2009, 12:57:43 am »
I suffer the same. I doubt the crank advance has anything to do with it as it doesnt happen in 1.0.xx firmwares with the same crank advance. Its a bug the firmware.

http://195.159.109.134/vemsuk/forum/index.php/topic,683.msg7829.html#msg7829

http://195.159.109.134/vemsuk/forum/index.php/topic,1037.0.html
« Last Edit: December 06, 2009, 01:01:43 am by Sprocket »

Offline Tony C

  • Hero Member
  • *****
  • Posts: 650
  • BHP: 8
    • Capriracing
Re: Starting issue Cold or Hot.
« Reply #9 on: December 06, 2009, 03:59:26 am »
this is the first version i used with a 36-1 set up,
the previous version 1.0.79 (i it think) was only used for the fuel side as was still using a dizzy,

Vems Ecu, Twin Plenum efi and N2o
13.314 @ 104.39 mph (10/06/07 3.9 v8)
Sponsored by: www.caprisport.com & www.interpart.biz
Web site: http://www.capriracing.co.uk

Vems Firmware: V1.1.74

Offline Denmark

  • Hero Member
  • *****
  • Posts: 542
  • BHP: 7
Re: Starting issue Cold or Hot.
« Reply #10 on: December 06, 2009, 06:21:29 pm »
yes that a speciel vems feature, with subaru trigger, and cold, that makes it impossible to start  >:(
working on the boxer

Offline Denmark

  • Hero Member
  • *****
  • Posts: 542
  • BHP: 7
Re: Starting issue Cold or Hot.
« Reply #11 on: February 02, 2010, 10:18:09 pm »
Did any og you cure the cranking/Kickback  problem ?

/Skassa
« Last Edit: February 02, 2010, 10:22:28 pm by Denmark »
working on the boxer