Re: MAP signal dampening

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

And you're getting a pump shot "ping" ?

Lyndon
-----Original Message-----
From: Tom Sharpe <twsharpe@mtco.com>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: March 17, 2000 7:29 PM
Subject: Re: MAP signal dampening


>232-244 @.050, 10 deg separation, 4 deg adv. Lotts of torque, Brodix heads
on a
>6" rod 406 SBC, 10.45CR +003 deck. No ping, 34 total wot, 44(+10) cruse, 20
>idle-2K, retards under 2500 rpm w/ throttle application, 28deg@3500 all in
by
>5K, 2 deg retard @ 6K. NO EGR.  Tom
>
>Programmer wrote:
>
>> 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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