Author Topic: Nearly stalling when starting from cold  (Read 46246 times)

Offline Tony C

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Re: Nearly stalling when starting from cold
« Reply #60 on: July 10, 2007, 06:52:05 pm »
right been playing again,
she fires up when cold then stalls after a few seconds and then on restart fires and idles around 800-1000 rpm,
which is better than before,
im heading the right way slowly :D

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 dnb

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Re: Nearly stalling when starting from cold
« Reply #61 on: July 10, 2007, 09:04:53 pm »
Increase the size of the afterstart parameters...  They do seem to need to be large.

Offline Tony C

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Re: Nearly stalling when starting from cold
« Reply #62 on: July 10, 2007, 09:43:09 pm »
which bits Dave?

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 dnb

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Re: Nearly stalling when starting from cold
« Reply #63 on: July 11, 2007, 11:12:38 am »
In MT in priming/cranking/afterstart in the settings menu there are 2 parameters called afterstart enrichment added value and and afterstart enrichment scaling.  These need to be fairly big, otherwise you risk actually adding LESS fuel than when the car is warm!

I don't remember the actual values I use, but I will look at the car at lunchtime.

Offline Tony C

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Re: Nearly stalling when starting from cold
« Reply #64 on: July 11, 2007, 09:00:20 pm »
cheers Dave,

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 dnb

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Re: Nearly stalling when starting from cold
« Reply #65 on: July 12, 2007, 12:03:02 am »
Didn't get out at lunchtime!  Damned people wanting me to tell them what's wrong with their radars ;)

I use 70 for the scaling and 30 for the added value.  It seems to work as I can start the car with no throttle now.


Offline Tony C

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Re: Nearly stalling when starting from cold
« Reply #66 on: July 12, 2007, 10:48:38 pm »
hi mate.
is that the afterstart enrichment scaling at 77c % you set to 70?
and afterstart enrichment added value % to 30?

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 dnb

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Re: Nearly stalling when starting from cold
« Reply #67 on: July 12, 2007, 11:38:21 pm »
That's it :)

Offline Tony C

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Re: Nearly stalling when starting from cold
« Reply #68 on: July 13, 2007, 02:16:29 pm »
will go try this now, ta 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 Tony C

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Re: Nearly stalling when starting from cold
« Reply #69 on: July 13, 2007, 09:55:26 pm »
well she started from cold (before changin the above)
and near died then picked up to 900,
its this near diying i need to cure now
i set the above settings as per yours dave, starts good when hot will see if its any better when cold in morning,
ta again 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 Tcal

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Re: Nearly stalling when starting from cold
« Reply #70 on: October 23, 2007, 10:39:45 am »
I was wondering that did you get this problem cured?
I´m having same kind of problems.

Offline Tony C

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Re: Nearly stalling when starting from cold
« Reply #71 on: October 23, 2007, 06:48:40 pm »
nah i aint cured it as of yet,
i changed a few things but never made any difference :(
so left it as was,

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

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Re: Nearly stalling when starting from cold
« Reply #72 on: January 31, 2008, 09:47:59 pm »
at last we are getting somewhere.
dnb is a star. the car runs from cold now, not sure if dave has any more tweeks to do from the datalogs he asked for, but sucess

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