VemsTune and 1.1.6x release

[Sprocket]

They can be found in the starting and idle menu, next to the tuning menu

Just try it without the prime pulse, put a zero in for the prime pulse, then see what happens, again check that the engine is not flooded. If Dave uses the same injectors as you and the engine configuration is of similar nature, it should start, but the settings may need tweaking only a little. If however Dave uses different size injectors, then you need to adjust the cranking VE to suit.

[Tony C]

have set Prime P to 0
anything else i need to change?
as going round to the car in the morning while its cold,
if it fails to start what should i do then?

[dnb]

Yes, I have very different injectors.  Mine are specified for alcohol based fuel (even though it's not available here yet).

Prime pulse should always be zero - I have never found it necessary.  Use the cold crank and afterstart enrichments to do the fuelling for starting.

[Tony C]

as i said this side of things is all new,
as the ecu came with a working config many moons ago,
its only recently with new firmwares i have had cold start probs, and now started to learn,
my cranking enrichment curve is:

-40C = 300%
-10C = 220%
20C = 164%
70C = 120%

After start Curve:
-40C = 240%
-10C = 170%
20C = 140%
70C = 120%

its all a bit different in 1.1.44 and megatune,
thus why i asked for any help on what sort of value i should be using etc.

[dnb]

It's difficult to guess exactly what the value should be - too many variables.  I would suggest increasing the afterstart -10C bin by 20% to 30% if the engine is trying to fire but not suceeding.  If there's nothing at all then you should increase both the crank and afterstart -10C bin.

[Tony C]

It's difficult to guess exactly what the value should be - too many variables.  I would suggest increasing the afterstart -10C bin by 20% to 30% if the engine is trying to fire but not suceeding.  If there's nothing at all then you should increase both the crank and afterstart -10C bin.

is that meant to read increase the afterstart -10 bin by 20-30% from 170% it is now?

[dnb]

Yes.

[Tony C]

nope still no start today,
how can i wipe 1.1.64 off the ecu so i can put 1.1.44 back on as need the car next week,
have tried firmware upload in 1.1.44 but it wont allow
keeps saying no hello from avr

[Tony C]

right have got it to upload 1.1.44 in MT again,
looks like im going to have to wait to go over to 1.1.64 for now :-(

[mattias]

right have got it to upload 1.1.44 in MT again,
looks like im going to have to wait to go over to 1.1.64 for now :-(

Do a datalog of a cold start and post the log, it contains the config so that's all we need.
I have used 1.1.64 successfully and started at 0 C down to  -25 C, with some difficult as I underestimated how much fuel it actually needs.

[Tony C]

files are here:
http://www.capriracing.co.uk/datalog-09-01-2010.zip

i have put the files for 1.1.44 and 1.1.64 in seperate named folders
the 1.1.44 files are an msq and xls file as they were done in megatune not vems tune.

thank you....

this what you want mate? 

[GintsK]

I am bit confused about 1.1.63 cold start too:
My cranking curve on 1.1.53 was up to 400% @ -40degC. Now it seems 304% is maximum.

Does injection of additional  fuel at first cranking cycles really works in this code?

It seems to me that prime-pulse scaling down not works. Does 0% means no pulse? I have pulse.

Can anybody comment?

Gints

[Sprocket]

I am bit confused about 1.1.63 cold start too:
My cranking curve on 1.1.53 was up to 400% @ -40degC. Now it seems 304% is maximum.

From what I can see, the 100% cranking enricment is the VE value set in priming cranking and afterstart. That VE value is % of required fuel set in base setup.

Making the cranking VE% larger and reducing the curve % will achieve the same.

I don't understand a warm cranking value on the curve of 120%, why not just increase the cranking VE by 20% and set the warm value on the curve for 100% and then adjust the remainder of the values apropriately. makes everything more representative when everything else is biased at 100% anyway.

[GintsK]

My warm crank value in curve is always 100%. and warm cranking is adjusted by setting cranking VE value.
What I have to do? lowering my 100% to 75%.

It seems I have not enough fuel at -15..-20deC. Engine starts just after few cranking attempts.

Those cars with 1.1.53/54 seems have no problems.  At least no one called me.

[MWfire]

I am bit confused about 1.1.63 cold start too:
My cranking curve on 1.1.53 was up to 400% @ -40degC. Now it seems 304% is maximum.

Does injection of additional  fuel at first cranking cycles really works in this code?

It seems to me that prime-pulse scaling down not works. Does 0% means no pulse? I have pulse.

Can anybody comment?

Gints

cranking=cranking enrichmnet*warump enrichment