Word, maybe I can get you a copy of a log or something and you can see what you can do. You seem to be pretty good at getting awesome mileage in these cars

 

hmmm thats rather interesting too.
im assuming your on a custom tune as well?


whos tune are you running?
its pretty common for people to turn off DFCO during tuning, so its quite likely they may just have forgotten to re-enable the engagement qualifiers.

 

The DFCO is much more apparent if you have a wideband AFR gauge to monitor...

Idling or cruising very slightly on the gas my LC-1 w/ DB-Red reads around the 14.7 range... If I am fully off the gas and coasting in gear, it will read 22.4 (or some gauges read "lean" or "error" as they don't go that lean). This is also the reading the gauge gets when the O2 sensor is completely in open air. Soo this is accurate, the exhaust is ALL air, NO gas...

DFCO is real and it does work. If it isn't working, and your tuned, it was probably turned off...

 

Stock 2008 ss

Never watched it on the old car, since it didn't have the instant readout, but it's pretty easy to notice when you have the DIC telling you your instantaneous mileage.

 

DFCO is proven to be better with a MT then a AUTO but my question is in a auto will DFCO be better then in natural?

 

SS/TC's as well?

 

Yeah, I've noticed similar, sort of. It seems as though the DFCO on my SS/TC (08) kicks in when coming from above 2750 and through roughly 2250 (if I'm remembering correctly), judging by the INST on the DIC. Downshift and have revs below 2750, your not at 99. Let it fall below 2250 on the coast, and it drops from 99.

I don't know if that's the way it is designed or what, but that's what I've noticed.

Oh, and yes, that's not in fifth. Fifth seems to be 99 on a coast.

 

after you go below a certain rpm, the injectors kick back on. i'm not sure what it is, in my car it doesn't seem to matter what gear i'm in, but somewhere right below 18mph you can feel the injectors come back to life.

 

i wonder how much gas you use when you downshift instead of putting it in neutral to stop
I would imagine giving the pedal a "blip" of gas for each gear would amount to more than the idle amount

 

try it and see.
ive tested it countless times, but no one will believe me anyway

 

when you downshift you're using ZERO gas. the fraction of a second blip is nothing, all you're doing is raising the rpms a little bit in neutral.

 

Has anyone here gone to standard transmission driving school? Yeesh!

Downshift to slow yourself down over a long coast or going down a hill.

Saves gas.

Saves brakes.

Saves lives.

What is there to argue about. Forget what phantom "improvement" you may think you get doing something. People drive manuals this way for a reason. GET OVER IT.

 

prepare to be frustrated lol.
we have been saying this stuff for years, the kids still think neutral coasting is ftw, and rarely listen.