Any hints on tuning for a big cam?

[Stuart Bunning]

In Australian P4 ECM's there was a thing called  a map limiter in some BIN's
This would allow you to trick the ECM to think it had a fixed amount of
vacuum at idle even though id didn't because of the sick cam. This way you
would get constant fuel supply at idle ignoring the erratic map sencor
output that would normally cause fueling to go mad. Once you reached a
particualar RPM or throttle posistion i thinks not 100% sure anyway just off
idle it would start to use the map sencor again. This has been used in
austrlia by engine builders that say there once suck lumpy cammed carby
motor is now a baby again.

I havn't learned much about it yet as these boys make a living out of engine
rebuilding/dynoing/delco reprogramming..

But I would love to know more as Once my motor is build I think I will be
having the same problem..


At 06:21 PM 13/2/99 -0600, you wrote:
>
>Does anyone have any hints on what sort of things to change to make a
>big cam run better in a GM car?
>
>I have adjusted the stuff that determines the BLM cells to ge better
>coverage, and that improves things some, but the BLMs/Ints are cycling
>quite a bit, is there anything that will improve this, or is this just
>normal?
>
>			Roger
>			93 Z28 A4

Stuart 
Australia
1 * 1988 VN Commodore Buick 3.8l V6 (Aussie GM Vehicle 808)
1 * 1976 Chrysler Charger 4.3l Hemi 6 with DELCO P4 808
1 * Bench ECU for testing and playing 808

Email: stuart at kenelec.com.au
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