Re: MAP signal dampening

["Programmer" <nwester@eidnet.org>]

What kind of cam you runnin' ? Are you getting PING cold or hot ?
What's your compression, FP, etc.....blah, blah....there's a lot of factors
to consider, including EGR flow. Cold spark bias is 20 B, hot is 10B.
The overall timing map looks generally normal, but WOT spk is limited. Tip
in spark is also limited--

Lyndon.
-----Original Message-----
From: Tom Sharpe <twsharpe@mtco.com>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: March 13, 2000 8:54 PM
Subject: Re: MAP signal dampening


>
>
>Programmer wrote:
>
>> Advance is the big key--but that's just MO.
>> Here's the rule of thumb I've used:
>> Cam duration of 270--set initial to 12BTDC 700 RPM Idle
>>                              280--set to 14 BTDC    1100 RPM
>>                             290 --set to 16 BTDC    1200 RPM
>>                             300   as high as 19 BTDC   1400 RPM
>>                            310    18 to 20 BTDC.   1500 RPM
>> Limited by hot starter kick of course <g>... Limit total to 34 if
>> compression is raised. Higher compression can stand higher
>> duration and lower idle RPM as base. Takes a lot of playing around--but
not
>> too much to nail it right. Optimum advance varies with engine
design...but
>> should basically be dialed all in around 3500 RPM.
>
>Do you need to set the timing back at tip-in to prevent ping?? (I would
think so
>- 20 deg at wot at 2k rpm seems a lot.)  rgds Tom (PS Mine does)
>
>
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