Cold start again.. And some other too

[Tcal]

I´m having some problems with that cold start. I´ve been trying to configure it for about three weeks now...
When cold (near zero degrees) car won´t start so well. Those warm start´s are quite good..

My car is Calibra turbo, equipped with v3.3 management. It´s running with 1.0.53 firmware.
470cc injectors, req fuel 4.4
And i´m having some problems too with those temp readings.
With 2252 256 hex loaded , reading is quite near in hot area, but when cold it shows about 10 degrees too much.

But here´s one log when starting from cold. Outside temp was around 4 degrees celsius...
That log is missing 15 seconds at 163s.  for some reason? (my laptop perhaps)
http://www.box.net/shared/rklin4xove
http://www.box.net/shared/q2pa43y6hp

Oops, somebody could move this into fuel injection area... It´s the right place for this?

[hilly]

What do you mean when you say it is difficult to start ?

Does it fire up then die, or is it difficult to get the engine to run at all ?

Hilly

[Tcal]

Yes, it fires ok, revolutions might go to up to 1100, then dies. This happens right after cranking
On second try everything usually works better. No problems at all when warm..
Sometimes it cranks ok, revs go up and then drop to 400-500, and after few seconds it´s behaving as it should (cold idle).

You should see what i mean when you look at that log.

[rob@vems.co.uk]

Sounds like afterstart:


Its getting colder now so you may want to increase the afterstart values and scale the 77degC amount accordingly.

[Tcal]

Yeah, i know..
I´ve tried them alot..
IIRc today i tried with 130ASE and 8 scaling.. Same as always when cold.
I think, next time i´ll try  to start with pedal pressed about 3-4% to see if it needs more air.

How much scaling should be good if ASE is like 70%-90%'?

[rob@vems.co.uk]

It's tricky to say, the rule of thumb is that you need to stick a hell of a lot more fuel in as it gets colder.
134 seems a hell of a lot mind... I wonder if we're looking at this the wrong way round - if its too rich now its getting colder.

[Tcal]

Could you recommend any reasonable values on those..
Maybe ASE 80%
Scaling How much?

[Tcal]

Tried this morning with throttle 4% opened. It got worse.

[rob@vems.co.uk]

So that does suggest that you need to consider a load more fuel, what are your warm-up enrichments like?  The ASE sits on top of those. So it may be worth setting your ASE back to where it was and increasing the warm-up value at the temperature point you're now at.

[Tcal]

Does Warmup change anything when problem is happening at ASE?
Or is ASE and Warmup calculated together and then scaled within clt?


For example:
If ASE is like 200% and Scaling is 10, What´s the temp when that 200 is applied? -40c or perhaps something else?

Well for tonight i thought i´d try 90% and 18 scaling..

Warmup is:

-40 180
-29 175
-18 160
-7   145
4     134
16   127
27   114
38   108
54   105
71   100

That -18 and colder is   ... I´m using engine heater when temp is -5 or colder.

Hope you understand my writings, I haven´t used english so much. There might be some words or some spelling(?) chosen wrong.

[cliffb75]

Yes, it fires ok, revolutions might go to up to 1100, then dies. This happens right after cranking
On second try everything usually works better. No problems at all when warm..
Sometimes it cranks ok, revs go up and then drop to 400-500, and after few seconds it´s behaving as it should (cold idle).

You should see what i mean when you look at that log.

That description suggests the cranking pulse is too smal - i.e. the fuelling on the first attempt is too lean.

Because of the failed start, the residual fuel is then added to the fuel being delivered on the re-start, so the engine runs.

Consider using larger cranking / priming values to estabilish the port wall film more aggressively.

Also, how is your fuel delivery system put together. Do you get full fuel pressure on the first crank? I have had problems with this on 'key through' starts on cars in the past, especially at cold temps.

[Tcal]

Hmm, i try tomorrow with longer Pump on after powerup time..
What does that pump on after inactivity mean?
They both have same time now (2.1)
And i´ll try with longer primepulse, and longer crank pw...

[Tcal]

Tried again with smaller Ase.
Here´s the log http://www.box.net/shared/3ttve1avcq
setup http://www.box.net/shared/cpmx10psrj


Looks like that lambda is on lean but i think it´s running too rich on ASE because PW drops from 4.4 to 2.1 when ase ends?
Why that RPM signal is at 122 after first attempt, MAP is as it should when not running?

[Tcal]

I was wondering that it´s now running wasted spark and injectors are in two banks. ?

Divider 1
Alternate from 3..0

I have that cam trigger installed, but it´s not in use. Would that help anything if it´s fully sequential?
I bought the car with vems installed so these trigger things are bit unknown to me.
I know it´s 60-2 VR and cam should be Hall...
Engine is Vauxhall/Opel C20LET, but i think C20XE triggersetup should be same

And maybe i should use newer firmware (now running 1.0.53)

[rob@vems.co.uk]

You have the injectors setup sequentially as you're alternating from 3..0 - as long as your H[0] table is setup correctly.