Cold start mapping for injection

[EFA]

My engine ceases to start in very cold weather as the fuel/temp mapping has never been set up properly. My car currently thinks its water temp is 5 deg c

 

Does anybody out there have some numbers they know work as follows:

 

I have 3 maps:

 

Cranking fuel/temp

Idle fuel/temp

std fuel/temp

 

Once warmish (+30 deg coolant) the engine runs fine.

 

Below this I need some %increase numbers for each of the maps at the follwoing temp breakpoints. -30deg, -20deg, -10deg, 0deg, +10deg, +20deg, +30deg (all temps centigrade)

 

There is no temp compensation on the ignition maps.

 

Does anyone have this info they can strip from the maps of a car which does start when its cold???

 

Thx

 

Arnie

 

Fat Arn

The NOW PROVEN R500 Eaterid=red>

See the Lotus Seven Club 4 Counties Area Website hereid=green>

 

[oilyhands]

Arnie,

 

I'm using ears and mouth in the same proportion...

 

These are the values I use as a start on all engines I have mapped, they work fine on my Atmo Cos, it idles cleanly from any temperature, and starts instantly regardless of temperature. They occasionally need a minor tweak on other engines. The idle fuelling correction will be the same as the main map since there is no separate provision.

 

The main map correction is then graded down percentage wise as RPM increases, but that shouldn't matter if you are just wanting to get it started, the cranking fuel correction decays quite quickly.

 

Cool Fuel Crank

Temp corr corr

-10 50 42

0 45 38

10 40 34

20 28 30

30 17 23

40 9 10

50 0 5

60 0 5

70 0 5

 

etc.

 

Oily

 

Edited by - oilyhands on 9 Jan 2002 08:56:21

[EFA]

Oily,

 

Sent you mail.....

 

 

 

Fat Arn

The NOW PROVEN R500 Eaterid=red>

See the Lotus Seven Club 4 Counties Area Website hereid=green>