Hey i know this might be a dumb question but.. If i down shift say from 3rd to 2nd when im comming to a stop or w/e will they wear my tranny out faster or what not? also my brother blew his 2nd gear, how the hell do you blow a gear?

 

The key to downshifting is <U>rev matching</U>.

I'm not trying to start a debate but, im guessing when you downshift your letting your car engine brake itself for the most part. Well I have been doing some research lately and its seems that some believe that downshifting, and engine braking is not a good thing, especially in the higher RPM.

<U>Atleast this is my understanding of it</U>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dan Lackey &raquo;</TD></TR><TR><TD CLASS="quote">Just don't lift off in gear. There's alot of talk about theory and stuff but the pro (real deal) engine builders know the limits of most components so ask them and not a book. </TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dan Lackey &raquo;</TD></TR><TR><TD CLASS="quote">When you lift off you have vacuum above the piston and when the piston changes direction going down the vacuum "pulls" (in reality pressure from the bottom pushes) on the piston and will want to rip the piston away from the rod. All dyno operators know this.
This is a big no no! Also when you lift off your cams move back and forth relative to the crank. Not a good thing with big cams.</TD></TR></TABLE>

Taken from here;
https://honda-tech.com/zero...age=4

Ali


Modified by PrinceAli132 at 1:49 PM 12/31/2006

 

WELL, technically yes it will, but just in the way normal driving would. Pushing the tranny into gear without the clutch being in, etc ie bad driving will hurt the tranny more. why would you downshift into 2nd to a full stop?

 

not to a full stop, like to slow the car down a bit and then into neutral. Get what im saying now? also how do u blow gears? is that possible or no because my brother would shift into second and the shifter would pop out of gear and into neutral, this was only when he went into second.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Teg’R’S &raquo;</TD></TR><TR><TD CLASS="quote">why would you downshift into 2nd to a full stop? </TD></TR></TABLE>

I do it more so for practicing heel-toe technique for the track, then for actual braking assistance. But I only do this when the roads are fairly empty. However I used it more often during crappy weather; heavy rain and snow.

Ali

 

Just rev match and don't downshift from 3rd when you are above 4 grand in 3rd. Thats what I go by anyways.

 

yeah i know im slowing down and i just down shift at about 3500 - 3000

 

Before I turboed my DC2, when coming off the freeway @ say 50 MPH in 4th gear I would press in the clutch and rev the car a bit then downshift to 3rd and do the same to 2nd gear.

It will prematurly wear down your tranny. So use your brakes.

It's cheaper to buy brake pads then it is to replace a tranny

 

ive been told that engine breaking can actually get you better gas mileage. can someone explain this to me? (since this is basically what we're talking about)

 

^ well im not sure of that because you dont waste gas when your breaking, its all how you drive.

 

i dont understand how it would be bad to lift in gear. so technically all automatic transmissions are bad in that way?

you will get better gas mileage by engine braking rather than sticking it into neutral because the transmission is turning the engine. but only do this if you know youre going to come to a complete stop.

i always rev match when downshifting regardless of whether or not im trying to slow down.

it makes driving a lot smoother and prevents unnecessary stress on your drivetrain.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrinceAli132 &raquo;</TD></TR><TR><TD CLASS="quote">The key to downshifting is <U>rev matching</U>.


Modified by PrinceAli132 at 1:49 PM 12/31/2006</TD></TR></TABLE>

 

Really I'd say it doesn't add much of any premature wear as long as you do a good job of rev matching. I basically ALWAYS down shift when slowing down and I have put 25,000 miles on my car since I've owned it and tranny still shifts like butter, motor is strong, and the clutch is the original and still holds very well. Think of it this way. Rev matching causes everything to spin at the same speed in the trans as the motor, which is what is occuring during normal slow down with out down shifting. So if you rev match properly and everything is spinning at the same speeds why would their be much of any premature wear. (If this made no since I'm still coming down off my drunkness from new years; so reread SLOWLY.)

 

hahha, happy new years. How do you rev match exactly, clutch in rev the engine while in neutral and into second or what?

 

You press the clutch, tap the gas, and put into next lower gear kinda all at the same time. It's kind of something you become used to and you will eventually become smooth as glass doing it. And the whole tap of the gas is so you get your revs to where they would be in the next lower gear so their isn't that wind up of the engine that occurs by just putting into next gear and releasing clutch.

 

also it might take a few days to learn what rpms to match to. i find most of the gears easy but 3-2 is a bit tricky at higher rpms.

 

so when im in 3rd, release gas, clutch in, push gas a little (while shifting into 2nd) and then release clutch and push brakes or how does it work out?

 

rev matching or not, it's going to put unnecessary wear on your clutch. brake pads are cheaper than a clutch and flywheel resurface.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by full Circling &raquo;</TD></TR><TR><TD CLASS="quote">rev matching or not, it's going to put unnecessary wear on your clutch. brake pads are cheaper than a clutch and flywheel resurface.</TD></TR></TABLE>

But it's so much cooler rolling to a stop at 4k rpm, fart can going nuts...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by erikiksaz1 &raquo;</TD></TR><TR><TD CLASS="quote">

But it's so much cooler rolling to a stop at 4k rpm, fart can going nuts...</TD></TR></TABLE>
lol...You should do some engine braking when you are breaking in a new motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JdmToGo &raquo;</TD></TR><TR><TD CLASS="quote">so when im in 3rd, release gas, clutch in, push gas a little (while shifting into 2nd) and then release clutch and push brakes or how does it work out?</TD></TR></TABLE>

if you have to come to a complete stop then use the brakes. if you just want to gradually slow down dont.

what i do is clutch in, tap gas, shift to next lower gear, release clutch. took me less than a day to get used to and now i do it everytime i need to slow down but dont need the brakes. i also heel toe downshift for those times when i need to beat the light at the offramp.

 

lol ^^