|
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.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
|