Join Date: Sep 2000
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Re: Catalytic Conv....
This may seem like a strange setup for fresh air but it seems to work and I swear every spring when the weather warms up, and I convert my '86, that my gas mileage takes a jump about 3mpg (I know the warm weather helps too). In the engine compartment, I use a plastic canning funnel ($1.66) and bolt it to the lower passenger side grill just below the horn with an existing screw hole(take off screw with an impact driver or use an EZ out when you strip it with a regular screw driver). I remove the hot/cold air hoses and vacuum shutter and then I run a piece of 3 inch dryer duct (37 cents) from it to the large opening in the filter box. I first used this on my '88 and now use it on my '86 with similar results. I hypothesis that the engine gets a ram effect at higher speeds because of the funnel located in a high pressure area of the grill. This probably is not a good idea for those who like to go wadding with their Samurais for fear of sucking up water. But for onroad and desert trails it seems to work great. When I lived in Arizona, my '86 hardtop consistantly got 33+ mpg. Now that I live in California it gets constantly 28 mpg. I think it is because of the oxygenated fuels and the fact that the smog check mechanic retarded my timing (and raise my idle speed) to pass the smog check.
For what it is worth, I am glad to see that people on this list are using their cats even when converting to a 2 inch system and headers. It is easy to think that just one cat less is not going to make a difference especially on a 1.3 engine. But vehicles are one of the major contributors to air pollution. I want my two grandchildren to have, at least, as good a quality of air as we have. (please note that I am talking about compliance with the spirit of the law and not the letter of the law since I have done the modifications with the cold/hot air hoses as well as header & 2" exhaust.)
Now if I could only figure out how to put a NASA scoop on the hood of the Samurai, this setup would be good for low water wading.