Cranking Advance vs Cold Advance

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Cranking Advance vs Cold Advance

Postby gslender » Mon Jul 09, 2012 3:22 am

Just wondering....

In the current MS2 code, the cold advance does not apply to the cranking advance, only once out of cranking and in engine ready/run.

Is that right? Should the cold advance only apply when running? Why wouldn't you want to have the increasing advance applied at cranking? It would seem logical that if the engine runs better with more advance when cold, wouldn't that apply in cranking? ...or is the logic to essentially have the maximum possible advance at cranking anyway and that more (or less when warm) doesn't help.

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Re: Cranking Advance vs Cold Advance

Postby jsmcortina » Mon Jul 09, 2012 4:00 am

The "cold advance" is perhaps a misnomer.
In another source I read that
-in a race car, advance when cold due to high-lift cams etc.
-in a car with a catalyst, retard when cold to increase exhaust temps and light up the cat.

Cranking isn't trying to do either of those and too much advance risks kick-back.

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Re: Cranking Advance vs Cold Advance

Postby piubrazil » Mon Jul 09, 2012 6:07 am

A cold advance cranking curve ( or whatever it could be named) would be very useful for the guys who runs 100% ethanol (80% of the cars here in Brazil). The cold crank in gasoline or even E85 doesn't need more advance than 6-12 degrees in cranking to have a solid start, but an engine runnign E100 need up to 35-40 degrees to start under 20ºC ambient. But this level of advance cause kickbacks in hotstarts, obviously. Unfortunattely we have to live with a more than ideal advance to hotstarts and less than ideal in coldstarts. I already had some broken starters due to kickbacks in engines running MS2.

I would be very glad if a cranking advance versus temperature curve where placed in the to do list.
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Cranking Advance vs Cold Advance

Postby gslender » Mon Jul 09, 2012 5:15 pm

There is a bit of incidental information on Google to suggest that more advance when cold cranking is helpful, and less during warmer cranking. Would be easy to adapt the existing cold starting advance to be applied/added to the cranking advance too!

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Re: Cranking Advance vs Cold Advance

Postby piledriver » Tue Jul 10, 2012 8:59 pm

gslender wrote:There is a bit of incidental information on Google to suggest that more advance when cold cranking is helpful, and less during warmer cranking. Would be easy to adapt the existing cold starting advance to be applied/added to the cranking advance too!

G



It would probably be well worth it, but it needs more range than current 10 degrees max for many applications.
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Re: Cranking Advance vs Cold Advance

Postby magaiverbrasil » Mon Jun 19, 2017 8:25 pm

I have , ms2 and ms3 , and i use 100% alcohol , i would like to have this implementation , crank advance for temperature.
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Re: Cranking Advance vs Cold Advance

Postby pepeleascov » Mon Jun 26, 2017 3:34 pm

This would be an interesting feature, for those who run E85 or E100 blends.
It will REALLY improve the cold starts!
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Re: Cranking Advance vs Cold Advance

Postby magaiverbrasil » Tue Aug 15, 2017 10:37 pm

Do they have any prediction to insert this into the code?
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Re: Cranking Advance vs Cold Advance

Postby webthiago » Sat Aug 26, 2017 4:18 pm

I have one ms2. Please add this to the code.
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Re: Cranking Advance vs Cold Advance

Postby Benetti » Mon Sep 04, 2017 5:32 pm

I have a MS2, and I would like to have this implementacion!
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Re: Cranking Advance vs Cold Advance

Postby magaiverbrasil » Fri Dec 08, 2017 11:39 pm

any prediction for this? It's winter in Brazil, the cold start is very difficult :-(
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Re: Cranking Advance vs Cold Advance

Postby igor.rodriguez » Sat Dec 30, 2017 9:37 pm

Hello! Good night everybody! Is there any forecast to implement this fix in code?
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