WAI revisited.

[zpiloto]

First day to check out the WAI. On the way to work I noticed that the ignition started to retard after the IAT reached 120. The temp maxed out at 155. The MPG for the trip were ok but not what I expected with a tail wind. Same on the return leg, good but not what I thought it should be for the conditions. So I did a quick test loop on rolling terrian of 10.5 mile with the cruise control set on 35 no stops.

Wind 050@15G20
Temp 80

WAI 135-155 WT 200-213 MPG 37.3
Modified WAI 125-140 WT 200-213 MPG 38.0
No WAI 105-125 WT 200-213 MPG 37.9
WAI 130-155 WT 200-213 MPG 37.4

I know that this is not enough data points to confirm that the WAI decreases FE but the trend seem to indicate that on my car (OBDII) that the best IAT range would be 100-120. Has anybody else noticed this? And What kind of temps are you seeing on the IAT?

[SVOboy]

I h8 that ignition retard stuff,

It's unfortunate that this mod only works for some of us and not for others.

[Compaq888]

the only cars I've seen this work is with small displacement. Prius, Insight and etc. The problem I think with bigger engines is they suck more air in and since the WAI allows for more air the bigger engine takes advantage of this.

[SVOboy]

The problem I think with bigger engines is they suck more air in and since the WAI allows for more air the bigger engine takes advantage of this.

The whole point of it is that it lets in less air!!!

[cheapybob]

What is the compression ratio and what octane fuel do you run? Maybe its at its limit running with the fuel you are giving it, and therefore if it gets any hotter, it pings and retards?

[Compaq888]

Originally Posted by SVOboy

The whole point of it is that it lets in less air!!!

wai and cai let more air in. The only thing restrictive is the stock airbox. Unless of course you get your air straight from the exaust manifold or the cat. It will kill your power but give you some mpg.

[zpiloto]

[quote]What is the compression ratio and what octane fuel do you run? Maybe its at its limit running with the fuel you are giving it, and therefore if it gets any hotter, it pings and retards?

I think you're probably right. between the heated fuel lines and the warm air it reached the fuel/car limits. I'm almost due for a fillup I try the expense stuff and see if that makes a difference in FE with the WAI. It wouldn't need to be to big a gain to make up the difference in cost.
One of these days I figure out how to quote the text right.:?

[SVOboy]

wai and cai let more air in. The only thing restrictive is the stock airbox. Unless of course you get your air straight from the exaust manifold or the cat. It will kill your power but give you some mpg.

Goodness gracious, the whole ****ing point is too let less air in, that's the reason it's ****ing hot, if more air is getting in you're doing something wrong.

[SVOboy]

zpiloto, to quote just highlight what you want to quote in the post while you're posting and hit the quote button, or cut and paste and surround the quote with the ["quote"]["/quote"] tags, but take the parens out.

[zpiloto]

zpiloto, to quote just highlight

thanks.
I agree with SVOboy. The hotter the air is the thinner(less dense)it is. Thats why the go to the desert to set speed records and why airplane burn less fuel at altitude there is not as much air.