Quote:
Originally Posted by oil pan 4
You have to watch out because exhaust tuning usually yealds the least results in terms of fuel economy unless you are working on a diesel then the gains are just small.
The closing of the intake valve has the greatest impact on engine preformance of the 4 open/close events of the intake and exhaust valves.
Messing with the intake cam may produce better results.
If you have the stock timing gears there isn't much you can do besides skip the belt by 1 tooth on the exhaust side towards the direction you need for retarding it. That should be good for about 4 degrees.
I did this with my little 1.8L toyota I had when I was over in japan years ago, but I advanced the intake timing by 1 tooth.
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Well, the thing is, I have control over both the intake and exhaust timing, but I want to focus on and track the results of the modifications separately. I won't have to do anything mechanical since the timing for both is adjustable through the ECU.