dblissett
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| posted on 22/1/05 at 07:59 PM |
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vac advance
i am trying to wright a base map for my pinto i know it wont be spot on and only a rolling road will sort it out spot on.
anyway my question is if the total advance for my pinto is 36 degrees at 3600rpm and the vac advance is 15 degrees max what happens with a standard
distibutor when you are at 3600 rpm and you take your foot off the throttle
does the vac advance take the timing to 51 degrees ie 36 + 15
or is the timing limited to 36 degrees no matter what
thanks dave
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rusty nuts
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| posted on 22/1/05 at 08:05 PM |
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I.I.R.C. the vacuum decreases with load , so at full throttle and max revs there would be no or little vacuum advance , so max advance would be 36
degrees . may need more advance at lower load/ revs? could be wrong though, but hope this helps
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gazza285
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| posted on 22/1/05 at 08:14 PM |
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It is an irrelevant question as the engine is doing no work at this point. Leave the advance at 36.
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mattdearden
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| posted on 24/1/05 at 09:57 AM |
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quote:
Originally posted by gazza285
It is an irrelevant question as the engine is doing no work at this point. Leave the advance at 36.
But what about just before you fully close
the throttle? Especially a cruising speeds (eg motorway) when you're travelling at a set rpm with very little throttle open. Lots of advance
here should improve fuel consumption.
I'd be very interested at possible theories on this as my car's fuel consumption is poor at the moment, and the maps I'm currently
running haven't changed this, possibly because there's not enough advance at partial throttle openings.
Matt Dearden
(2lt Pinto Cat)
http://www.cate1.co.uk
http://www.swtoc.co.uk
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smart51
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| posted on 24/1/05 at 01:42 PM |
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vacuum advance advances the timing in proportion to the amount of vacuum in the manifold. i.e. at full open throttle it advances the timing, no?
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gazza285
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| posted on 24/1/05 at 05:50 PM |
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Vey little vacuum at full throttle as the chokes are wide open.
Lots of advance at motorway cruising speed will melt the pistons. Set your maps on a rolling road or dyno, it is the only reliable way.
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mattdearden
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| posted on 24/1/05 at 08:42 PM |
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quote:
Originally posted by gazza285
Lots of advance at motorway cruising speed will melt the pistons. Set your maps on a rolling road or dyno, it is the only reliable way.
Hmm,
pre-detenation I'm guessing? Surely if you listen out for pinking and retard it until it stops you should be ok?
I've used an Emerald base map on mine which had improved drivability loads, but my fuel consuption is still rubbish, even whilst cruising down
motorways 
Matt Dearden
(2lt Pinto Cat)
http://www.cate1.co.uk
http://www.swtoc.co.uk
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dblissett
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| posted on 24/1/05 at 08:48 PM |
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pinto map
hello matt i have found nottingham uni does engine testing for ford i help out with some industrial stuff nothing to do with cars
anyway one of the guys there needs my help
so one favour for another he he
i will try and get to see him soon and ask about the vac advance at part throttle
i asked last week but the main man wasent in
i still think the best thing is a rolling road
but we should be able to get somwhere near
cheers dave
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gazza285
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| posted on 24/1/05 at 08:55 PM |
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You may be a little overcarbed using 45s with a standard cam. Whatever you do running Webers is a dear job, my old Mk1 Escort ran a 1600 X-flow on
45s, sounded lovely between petrol stations, but cost me £90 to get to Stranraer and back (480miles) six years ago.
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mattdearden
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| posted on 24/1/05 at 10:40 PM |
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quote:
Originally posted by gazza285
You may be a little overcarbed using 45s with a standard cam. Whatever you do running Webers is a dear job, my old Mk1 Escort ran a 1600 X-flow on
45s, sounded lovely between petrol stations, but cost me £90 to get to Stranraer and back (480miles) six years ago.
Funny you should mention
that, as I've just taken delivery of a Kent FR32 fast road cam  Once installed, I plan to take the whole lot down to a rolling road and get
him to tweek the ECU too. Hopefully I'll end up with something faster and a little lighter on the wallet!
I think my next car's going to have fuel injection 
Dave - let me know when you've sorted a map out. I was thinking of getting my rolling road man to generate me a couple of maps, one for
trackdays/fast road and one for cuising.
Matt Dearden
(2lt Pinto Cat)
http://www.cate1.co.uk
http://www.swtoc.co.uk
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omega 24 v6
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| posted on 24/1/05 at 11:11 PM |
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I have set up the ignition timing on a hotrod oval race car with a very peaky cam. The vac advance was not connected as the engine runs at peak (up to
8000) revs for most of the race. The engine suppliers advice is that full mechanical advance happens at around 5000 revs and ignition timing should be
set at 32 degrees. Hope this helps and good luck.
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omega 24 v6
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| posted on 25/1/05 at 12:38 PM |
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Sorry should have said it was a 2ltr pinto .
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dblissett
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| posted on 25/1/05 at 06:39 PM |
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map
hello matt i have sent you a map in excel
its 10 x 10
see what you think
dave
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