sometimes when i drive in small roads i start off in 1st and shift. 1 2 3 4 5 ...and i look at it im only at 20mph...https://honda-tech.com/forums/images...es/emsmile.gif and i can still pick up speed ...not as fast but enough...its my ctr tranny that helps

Re: (1fstdc2)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1fstdc2 &raquo;</TD></TR><TR><TD CLASS="quote">sometimes when i drive in small roads i start off in 1st and shift. 1 2 3 4 5 ...and i look at it im only at 20mph...https://honda-tech.com/forums/images...es/emsmile.gif and i can still pick up speed ...not as fast but enough...its my ctr tranny that helps</TD></TR></TABLE>

okay?, and how do you know the ctr tranny help you out?

wow long interesting reads

i shift to 2nd pretty much right after the car starts moving in 1st gear... is that good or bad? my dad told me to keep that as a habit so roffle i barly go anywhere and i end up on 2nd

or if the car is even moving at 2 mph you can be in 2nd gear

good ??? bad??? figured this is a good question for me to know since ive been doing that for hella long

Re:
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DA_9 &raquo;</TD></TR><TR><TD CLASS="quote">This has got to be one of the most educational posts, as well as informative, and worth while reading in a long time. https://honda-tech.com/forums/images/smilies/emthup.gif </TD></TR></TABLE>

truth https://honda-tech.com/forums/images/smilies/emthup.gif I learn all types of things when dogginator post in a thread...comes with all types of graphs and maps, study hall is now in cession https://honda-tech.com/forums/images...s/emsmilep.gif

Re: Re: (D@9 A.D.B.)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D@9 A.D.B. &raquo;</TD></TR><TR><TD CLASS="quote">

truth https://honda-tech.com/forums/images/smilies/emthup.gif I learn all types of things when dogginator post in a thread...comes with all types of graphs and maps, study hall is now in cession https://honda-tech.com/forums/images...s/emsmilep.gif </TD></TR></TABLE>

werd https://honda-tech.com/forums/images/smilies/emthup.gif

Re: Re: (DA_9)
 

wow hella info..all depends on the driver

Re: (SkaiWu)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkaiWu &raquo;</TD></TR><TR><TD CLASS="quote">wow long interesting reads

i shift to 2nd pretty much right after the car starts moving in 1st gear... is that good or bad? my dad told me to keep that as a habit so roffle i barly go anywhere and i end up on 2nd

or if the car is even moving at 2 mph you can be in 2nd gear

good ??? bad??? figured this is a good question for me to know since ive been doing that for hella long </TD></TR></TABLE>

i shift to second after i'm at 3-3.5 in first....when decelerating, i do not downshift(use the brakes) and only go into first if i am 0-6 mph....the reason is because i would rather have second gear break on me than 1st from jamming it in gear

Re: (lmike6453)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lmike6453 &raquo;</TD></TR><TR><TD CLASS="quote">

i shift to second after i'm at 3-3.5 in first....when decelerating, i do not downshift(use the brakes) and only go into first if i am 0-6 mph....the reason is because i would rather have second gear break on me than 1st from jamming it in gear</TD></TR></TABLE>

i shift into second after 3 k also. if i have to change gears to downshift while on the road i never force the shifter into gear. its always a soft touch for me and that assures me im being easy on my stuff...if im in the city ill be in 4th or 5th at 40mph and someone in front of me wants to turn i take it out of gear and try for 2nd if it doesnt easily go then i put it in 3rd after i depress the clutch i might be at 1.5 rpm but city driving doesnt require hard acceleration. plus honda trannies are all pretty short anyway...

ctr tranny helps alot by how short the gears are https://honda-tech.com/forums/images...es/emsmile.gif

Re: (1fstdc2)
 

new question

when I am driving on snow/ice. why does downshifting work better at stoping than just using the brakes?

Re: (Berlinetta F1)
 

so..... driving at 85 in the highway while in "vtec" mode or close to it, saves more gas then driving at 70? https://honda-tech.com/forums/images...es/emsmile.gif

Re: (vtek9)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtek9 &raquo;</TD></TR><TR><TD CLASS="quote">so..... driving at 85 in the highway while in "vtec" mode or close to it, saves more gas then driving at 70? https://honda-tech.com/forums/images...es/emsmile.gif</TD></TR></TABLE>

why would it do that?

Re: (Berlinetta F1)
 

To slow the car down, you are better off using the brakes than engine compression (that's what you're using when you put the car into a lower gear to get it to slow down). That's because brakes are designed to slow down the car. Better to wear the brake pads, which are inexpensive and easily replaceable, than the transmission and gears, which are neither.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Berlinetta F1 &raquo;</TD></TR><TR><TD CLASS="quote">when I am driving on snow/ice. why does downshifting work better at stoping than just using the brakes? </TD></TR></TABLE>

It doesn't. Furthermore, downshifting can cause your car to break traction, which is the worst thing that can happen on snow and ice.

Re: (Berlinetta F1)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Berlinetta F1 &raquo;</TD></TR><TR><TD CLASS="quote">new question

when I am driving on snow/ice. why does downshifting work better at stoping than just using the brakes? </TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">
It doesn't. Furthermore, downshifting can cause your car to break traction, which is the worst thing that can happen on snow and ice.
</TD></TR></TABLE>

i am going to have to disagree with this in a way...it will give you better traction to "downshift" or be in a gear rather than not accelerating nor decelerating...tires will lose traction this way depending on speed, tread, slope, and gravel

wow lots of counter arguements...

what way does down shifting to slow the car down gives better mpg then braking in neutral? neutral car is at idle revs rather then going thru the revs to slow down

Re: (SkaiWu)
 

im playing with my rpm range and well it doesnt matter for me cause i dont have an 02 sensor and im fully tuned so im stuck at 15.9mpg full throttle most of the times and taking it easy with vtec 3 times a day about 16.7mpg. also street driving im getting 17mpg hahaha b16 tranny so at 80mph im at 4k rpms. so im at a lost haha. (no good info here just my car)

Re: (SkaiWu)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkaiWu &raquo;</TD></TR><TR><TD CLASS="quote">wow lots of counter arguements...

what way does down shifting to slow the car down gives better mpg then braking in neutral? neutral car is at idle revs rather then going thru the revs to slow down</TD></TR></TABLE>

The arguement for better fuel economy while decelerating in gear is that the fuel injectors are shut off during the deceleration. If I recall correctly from my owner's manual, the cutoff is above about 3000 RPM for a DC2 (if someone has the exact number, please post it). So in that case, no fuel savings are realized.

Re: (Dogginator)
 

TI filled the tank and have been shifting about 2,500 RPM.. Very little V-Tak engagement (maybe 4-6 times) and a good mix of highway and city (60,40). If it's exactly 11 gallons when I took that pic, (give or take a little bit, I'm sure I got around 32 MPG out of this tank. I'll fill up today and letcha know exactly what it was. And this is from a somewhat built GSR thats running rather rich at the moment https://honda-tech.com/forums/images/smilies/emsad.gif
https://i240.photobucket.com/albums/...n/DSCN0022.jpg

From the helms manual:

Section: 11-49
3. Fuel Cut-off Control
. During deceleration with the throttle valve closed, current to the fuel injectors is cut off to improve fuel economy at
speeds over following rpm:
B18B1 engine: 970 rpm {Canada model: 1,050r pm)
B18C1 engine: 970 rpm { Canada model: 1,050rp m)
B18C5 engine: 1,300 rpm (Canada model: 1,400r pm)

Re: (mac_24_seven)
 

good topic!
good info.

Re: (NAmodified)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NAmodified &raquo;</TD></TR><TR><TD CLASS="quote">good topic!
good info.</TD></TR></TABLE>

helps https://honda-tech.com/forums/images/smilies/emthup.gif

Re: Myth buster, bust this myth (Dogginator)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">TPS controlling the amount of fuel. https://honda-tech.com/forums/images...s/emhammer.gif

I'll be nice. So here it is. The amount of fuel fed into the cylinder is determined by the oxygen sensor during normal operation. The TPS has little to do with the actual amount of fuel fed into the engine: it serves more as a predictictor to changing fuel needs as the throttle position changes.

The exceptions to the oxygen sensor control is open loop (cold engine) and WOT.

When cruising, you depress the throttle to the point where you make enough HP to maintain speed. In general, lower RPM operation requires greater torque to produce the same HP as high RPM operation. To make this greater torque, the cylinders are more fully filled compared to high RPM making the same HP. Fuller cylinders creates a higher dynamic compression ratio, which operates more efficiently than partially filled cylinders.</TD></TR></TABLE>

It doesn't have to be WOT. The O2 sensor may get ignored even under moderate acceleration. It's not burning a stoichiometric mixture when you're accelerating in traffic, I can pretty much guarantee that.

The O2 sensor starts getting ignored more and more as the throttle angle increases.

The O2 comes into play in a huge way at steady cruise or at idle (CTS @operating temp)

Re: Myth buster, bust this myth (B serious)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B serious &raquo;</TD></TR><TR><TD CLASS="quote">

It doesn't have to be WOT. The O2 sensor may get ignored even under moderate acceleration. It's not burning a stoichiometric mixture when you're accelerating in traffic, I can pretty much guarantee that.

The O2 sensor starts getting ignored more and more as the throttle angle increases.

The O2 comes into play in a huge way at steady cruise or at idle (CTS @operating temp)</TD></TR></TABLE>

And the MAP sensor input would be used to determine the fuel feed during open loop, not the TPS. That is why VAFCs modify the MAP sensor input signal.

Re: Myth buster, bust this myth (B serious)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B serious &raquo;</TD></TR><TR><TD CLASS="quote">

It doesn't have to be WOT. The O2 sensor may get ignored even under moderate acceleration. It's not burning a stoichiometric mixture when you're accelerating in traffic, I can pretty much guarantee that.

The O2 sensor starts getting ignored more and more as the throttle angle increases.
</TD></TR></TABLE>
From what I can tell, it's more of an on/off for closed loop. Open/closed loop seems to be controlled by load or MAP, as opposed to TPS.
From hours of datalogging:
I hold the throttle steady at 30-35% cruising, and if my boost controller is setup wrong and the boost is bouncing up and down, it goes in and out of closed loop. 12-15-12-15-12...etc
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">Anyone care to explain this plot?
http://www.honda.co.jp/factbook/auto...e3/013-003.jpg</TD></TR></TABLE>
Looks like a per gear RPM vs speed efficiency(?) chart with torque curves shown. I'm not exactly sure what the %'s stand for. Care to enlighten us?

Re: Myth buster, bust this myth (thewrai6th)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thewrai6th &raquo;</TD></TR><TR><TD CLASS="quote">Looks like a per gear RPM vs speed efficiency(?) chart with torque curves shown. I'm not exactly sure what the %'s stand for. Care to enlighten us?</TD></TR></TABLE>

The plot is for the chassis performance. The right axis is RPM vs. speed for each gear (straight lines). I think the left axis is Kgf vs. speed for each gear (squiggles). I too am confused by the %.

Re: Myth buster, bust this myth (Dogginator)
 

well from my experience with my gsr I would get pretty decent mpg about 28mpg from shifting around 3k-4k but my mpg goes way down when I go wot and shift at 8k. soooo Basically I feel if you want the best gas mpg 3-4k is best. However I also feel proper maintaince on ur car is key to saving the most money on gas. https://honda-tech.com/forums/images...s/emcocktl.gif