Electronic ignition and timing
05-01-2002 | 01:22 AM
#1
Thread Starter
8th Gear
Joined: Nov 2001
Posts: 8
Likes: 0
From: South Africa
Electronic ignition and timing
I am changing my 1975 911 Carrera 3.3 old distributer ignition system to an electronic ignition system supported by a Motec management system.
Basis spec's: 3,3 liter pistons, compression 10,5:1 twin spark, RSR cams and using 102 octane fuel.
Any ideas on the mapping of the timimg will be appreciated. I have run out of time and will not be able to run the car on a dyno before the first 2 races.
Basis spec's: 3,3 liter pistons, compression 10,5:1 twin spark, RSR cams and using 102 octane fuel.
Any ideas on the mapping of the timimg will be appreciated. I have run out of time and will not be able to run the car on a dyno before the first 2 races.
05-02-2002 | 11:59 PM
#2
RL Technical Advisor
Joined: May 2001
Posts: 11,871
Likes: 65
From: Portland Oregon
Veleen:
As this is going to be a twin-plug engine, you cannot use single-ignition timing specs otherwise you'll buy new pistons pretty quickly.
For pump gas, I've had good luck with:
Idle: 6-8 deg
3000: 22 deg
6000: 26-27 deg
You can plot the points in between or tweak it on the rolling road but do not exceed these figures.
Have fun,
As this is going to be a twin-plug engine, you cannot use single-ignition timing specs otherwise you'll buy new pistons pretty quickly.
For pump gas, I've had good luck with:
Idle: 6-8 deg
3000: 22 deg
6000: 26-27 deg
You can plot the points in between or tweak it on the rolling road but do not exceed these figures.
Have fun,
