drilling disc brakes - Page 4 - Fuel Economy, Hypermiling, EcoModding News and Forum

mikehallbackhoe · 03-27-2012, 08:58 PM

okay,so I definitely have dfco,so if I am going down a steep mountain road, I should just leave it in gear, with the engine running, no throttle, and it will use no fuel going down the mountain?

ShadeTreeMech · 03-27-2012, 09:36 PM

Correct.

One way to know if it is working is that a carburetored (sp?) engine without DFCO will cackle like mini backfires as the unspent fuel burns off in the hot manifold. My dad's old '71 Ford truck made all sorts of racket going downhill when he engine braked, and so did my old 80 Datsun 210. Kinda makes me remember the old days.....

But anyway, if your vaccuum lines are intact, sounds like you should trust the engine to do its job.

jtbo · 03-27-2012, 09:36 PM

Quote:

Originally Posted by mikehallbackhoe

okay,so I definitely have dfco,so if I am going down a steep mountain road, I should just leave it in gear, with the engine running, no throttle, and it will use no fuel going down the mountain?

That is how it should be, but do a test, drive one or two tanks with leaving it on gear and see if there is change to your typical method, that should be best way to tell if it is working in your car.

I play only with older cars and there are things people do to them while imagining it will increase performance

mikehallbackhoe · 03-27-2012, 09:56 PM

do I have to keep it over a certain rpm, or can I just put it in 5th, and let the rpms drop?

Ryland · 03-28-2012, 01:35 AM

I think the engine has to be over 1,000 RPM, it varied a little depending on what engine and transmission the car has, but if you are crawling up to a stop light in gear with your foot off the gas you will feel the engine kick back in when it reaches that minimum RPM, it's set just enough above idle that the engine has time to fire up instead of stalling if you press in the clutch.

It's a great design and it allows you to stop burning gas for short bits of time that otherwise wouldn't be worth turning the engine off for.

mikehallbackhoe · 03-28-2012, 02:08 AM

thanks for all the info. I started with a brake question, but gained a lot of info. the more I learn about this little crx, the more I like it.