D3 vs. D4 in my 1997 CR-V
Ed Lazarowitz
I'm sure this topic has been discussed here before, but here goes
anyway:
When precisely is D3 more appropriate than D4?
Is extended use of D3 detrimental to the transmission in any way?
Although I haven't experimented with it, I suspect that more than
occasional use of D3 would have an adverse effect on MPG... is this
true?
Lazer
Mista Bone
Use of D3 at speeds 50 mph or less constant and you may see and
improvement in mileage due to engine being in a more efficent powerband.
C. Tague aka. Mista Bone
"Baby won't you rock it tonight."
93 Honda Civic DX HB
Clarion, JBL, & MTX
Neuspeed, Eibach, & BFG R
Dennis Kuo
>I'm sure this topic has been discussed here before, but here goes
>anyway:
>
>When precisely is D3 more appropriate than D4?
Only when you don't want the transmission hunting between D3 and D4 in,
say, the hills at 45 mph. It's also helpful if you're going down a
moderate grade at moderate speeds and want the greater engine braking that
3rd gear would provide. Still, I rarely used D3 in my old '88 Integra and
I don't see using it in our CR-V that much.
>Is extended use of D3 detrimental to the transmission in any way?
Probably not.
>Although I haven't experimented with it, I suspect that more than
>occasional use of D3 would have an adverse effect on MPG... is this
>true?
Yes, because using D3 locks out the more fuel efficient D4. I've never
done a real comparison on this though. If you need the power while in D4,
just press harder on the accelerator pedal and you'll downshift into the
gear you need.
Dennis
nosp...@me.com
On Sat, 24 Jan 1998 10:15:52 -0500, sta...@mindspring.com (Dennis Kuo)
wrote:
>|In article <34ca847c...@news.erols.com>, laza...@erols.com wrote:
>|
>|>I'm sure this topic has been discussed here before, but here goes
>|>anyway:
>|>
>|>When precisely is D3 more appropriate than D4?
>|
>|Only when you don't want the transmission hunting between D3 and D4 in,
>|say, the hills at 45 mph. It's also helpful if you're going down a
>|moderate grade at moderate speeds and want the greater engine braking that
>|3rd gear would provide. Still, I rarely used D3 in my old '88 Integra and
>|I don't see using it in our CR-V that much.
>|
Question - my owner's manual ('98 Accord LX V6 Coupe) says the auto
trans has "grade logic control" so that in addition to downshifting
automatically when climbing a hill it will also downshift
automatically when going down a hill sufficiently steep to cause speed
to increase at some rate. I assume that's only when off-throttle. My
question is, would the use of D3 lock out this feature or is it
available no matter what the current gear selection? Although NE
Kansas is hilly, there are no mountains nor hills steep and long
enough for me to test this out.
Steve
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