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Stumbled across this in my archives, it's from "SHO Jim" from April
of last year.
Just recycling it as an FYI for some of the newer folks.
Lake Orion, MI
'99 black 29K
From: On Behalf Of SHO Jim
Sent: Tuesday, April 04, 2000 3:21 PM
To: V8 SHO; Dave Kegel
Subject: PCM Info
1996-99 SHO Questions
1. Are the secondaries programmed to switch state @ 6800 RPM?
· Yes - This action provides better control of engine speed when limiting
maximum RPM. Switching the secondaries (IMRC position) reduces engine
power, thereby reducing the need for cylinder cutoff to control engine speed.
2. Is the timing on the SHO conservative for midwest driving conditions &
· No - The SHO has been calibrated for optimum performance on Premium fuel.
The knock sensor reduces spark advance automatically for high temperatures or
poor quality fuel. Other spark compensation has been built into the
calibration for extreme conditions.
3. Is there a timing retard while shifting?
· Yes - The retarded timing reduces engine power during shifts, which enables
quicker shifts with reduced wear on transmission components.
4. Are there performance gains to be had with the right table settings or
· No - Optimum power was developed on dynomometer tests & validated on
prototype vehicles. The knock sensor allows optimum spark under normal
conditions, and retards spark as knock initiates.
5. Do you know anyone who does quality aftermarket chips for the EEC-V
· No - Customers have reported that some aftermarket chips cause excessive
"spark knock". This could lead to engine damage under some
6. Are some EEC-V SHO ('96-'99) programs more aggressive than others?
Thomas F. Mausolf
Many thanks Ron Porter, SHO Jim & Thomas F. Mausolf