Look here for help first!* Understand that this is HIGH TECH and will not be do-able by just an average mechanic....you might need an engineering degree.
How to do it:
* will likely need to remove the air cleaner in order to drill a hole for the spring in the edge of the heat stove
* the spring is probably from an old screen door (wooden type)...this seems to have about the right "pull". You should use around a 5" length of spring. Will probably need to make a loop for one end after cutting it to length.
* The bottom end of the spring needs to be "crimped" to stay on the heat shield...since there has to be some slack in the linkage in order for it to work
* I use heavy copper wire to make the link at top...easier to adjust the length...but strong enough to hold it's shape
So what does it do? Just gives your lead foot a reminder of where the best throttle position might be for the best mpg...but can be overidden at any time if needed. Seems to me that I have around 75-85% full power at maybe 1/4th or less throttle....keeps you out of the secondary?
You need to adjust it to your preferences...for a 1.5L probably somewhere past the throttle position needed to maintain 55 mph...for a V6 or V8...just about at that point.
This could be set up on any engine that isn't fly by wire...just need to find room for the spring and find a place on the engine to tie the end down.
*Need to be sure you will have no interference with throttle operation...install at your own risk.
