Just recently acquired a 1985 VW Jetta GLI. Physically it's in extremely decent shape (just moved to California. 85 cars sure aren't usually like this back east).
The cis-e needs to be tuned. It's currently not really all too driveable.
That said, once (if) I get everything all set and good, I'd be wanting to look at ways to improve economy and power. Since I'm going to be sticking with cis-e most likely (this is my first), it may be a little interesting. Hopefully I'll be able to go without the cold start valve.
So that got me to thinking.. how good would the csv be at spraying water? What if I got a standalone pump and water tank, and regulated the csv somehow so it sprayed an appropriate amount of water? It should be designed to evenly spread among the cylinders.
So then I could advance timing even more, while on 87 octane. Specs call for 6'btdc, and people say they can run 10'btdc on a stock engine on 87oct. So how much is too much? When do gains stop?
It is cis-e though, so it does read the o2 sensor. I'd rather not have to remove the dpr though since I'm sure sometimes extra fuel would be desired. Any way to run lean with water and not have the dpr go crazy trying to compensate?
And about timing, is manual adjustment necessary if there's a knock sensor? Or will it automatically just keep bumping it if possible?
Cool! Anyone try something like this? Or want to?
It'll probably be a while before I can get the car restored enough to be a main driver.
Linear Mode
