downshifting on the highway question
#21
11 Second Club
iTrader: (46)
Join Date: Feb 2004
Location: jacksonville, fl
Posts: 1,667
Likes: 0
Received 0 Likes
on
0 Posts
Rev matching means that if you downshift, you rev up your motor some to be closer to the rpm that you are about to be at. Meaning if in 6th doing 70mph at 1550 rpms and then you want to go to 3rd you will be around 3300 rpm at the least more around 3500. But instead of going from a near idle Rpm to 3500, while you have the clutch pushed in you rev the engine a little bit to make it not so hard on the driveling. I normally will rev to about 2800 or so and then slowly let the clutch out.
That cam is not very big at all, so yea you should have nice pullin power even in 5th.. I know I do lol
That cam is not very big at all, so yea you should have nice pullin power even in 5th.. I know I do lol
#22
TECH Resident
iTrader: (7)
Join Date: Apr 2005
Location: Houston, TX
Posts: 762
Likes: 0
Received 0 Likes
on
0 Posts
75-80, i'd go from third. but i wouldn't just drop it then punch it. shift into the gear, let the rpm's go up and then hit it. unless you have a built transmission then you can beat the hell out of it!
#23
yea i think thats what i need to do, drive drive drive and learn alll about the car....
Rev matching means that if you downshift, you rev up your motor some to be closer to the rpm that you are about to be at. Meaning if in 6th doing 70mph at 1550 rpms and then you want to go to 3rd you will be around 3300 rpm at the least more around 3500. But instead of going from a near idle Rpm to 3500, while you have the clutch pushed in you rev the engine a little bit to make it not so hard on the driveling. I normally will rev to about 2800 or so and then slowly let the clutch out.
That cam is not very big at all, so yea you should have nice pullin power even in 5th.. I know I do lol
That cam is not very big at all, so yea you should have nice pullin power even in 5th.. I know I do lol
also i really dont know about cams so i dont know all about the number...think you could give me a little infor on what they all mean?
yea eventually i will get a built tranny but hopefully wayyy before then i will learn how to drive her properly hahah
#24
11 Second Club
iTrader: (46)
Join Date: Feb 2004
Location: jacksonville, fl
Posts: 1,667
Likes: 0
Received 0 Likes
on
0 Posts
I would let the car settle in the gear before you punch it... like rev match and then let the clutch out, not to fast or slow. Then one the car is in gear you can get on it.
#25
#26
also if you examine your car you can see that in 3rd gear your RPM's needle and your speed needle match so w/e gear ur in, you can see, compared to the speedo needle, this will tell you where ur rpm's would be if u were to drop it from whatever gear.....just a lil thing i learned
#27
Launching!
Join Date: Dec 2006
Location: Hoosier Daddy....
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
Like the guys said, 5th and 6th are overdrive gears.
Rev matching is, when you are going to downshift at speed, push in the clutch, tap the gas to bring the rpm's up, and slide it into the lower gear. I can't say what the exact rpm's are, I always do it by feel. 2nd nature, I guess.
I do say slide it into the lower gear, because if you are forcing it, you're probably doing it wrong, and that's where you start to break stuff. Try it at lower speeds (55-60) until you get the hang of it. Then higher speed downshifts will go smoother for you.
Have fun, but be careful. These cars are addicting!
#28
also if you examine your car you can see that in 3rd gear your RPM's needle and your speed needle match so w/e gear ur in, you can see, compared to the speedo needle, this will tell you where ur rpm's would be if u were to drop it from whatever gear.....just a lil thing i learned
Like the guys said, 5th and 6th are overdrive gears.
Rev matching is, when you are going to downshift at speed, push in the clutch, tap the gas to bring the rpm's up, and slide it into the lower gear. I can't say what the exact rpm's are, I always do it by feel. 2nd nature, I guess.
I do say slide it into the lower gear, because if you are forcing it, you're probably doing it wrong, and that's where you start to break stuff. Try it at lower speeds (55-60) until you get the hang of it. Then higher speed downshifts will go smoother for you.
Have fun, but be careful. These cars are addicting!
Rev matching is, when you are going to downshift at speed, push in the clutch, tap the gas to bring the rpm's up, and slide it into the lower gear. I can't say what the exact rpm's are, I always do it by feel. 2nd nature, I guess.
I do say slide it into the lower gear, because if you are forcing it, you're probably doing it wrong, and that's where you start to break stuff. Try it at lower speeds (55-60) until you get the hang of it. Then higher speed downshifts will go smoother for you.
Have fun, but be careful. These cars are addicting!
#30
If you want that clutch to live after you rev match it release the clutch completely before punching it. If you punch it without full clamping force you'll be smelling clutch and eventually be slipping like mad after repeated screw ups like that.
With practice you'll have a good feel for when to release that clutch that you can break loose tires from a roll. It's pretty dramatic to go from 6th to 3rd, and depending on the speed you can pull a 2nd gear roll run too... heh
With practice you'll have a good feel for when to release that clutch that you can break loose tires from a roll. It's pretty dramatic to go from 6th to 3rd, and depending on the speed you can pull a 2nd gear roll run too... heh
#31
If you want that clutch to live after you rev match it release the clutch completely before punching it. If you punch it without full clamping force you'll be smelling clutch and eventually be slipping like mad after repeated screw ups like that.
With practice you'll have a good feel for when to release that clutch that you can break loose tires from a roll. It's pretty dramatic to go from 6th to 3rd, and depending on the speed you can pull a 2nd gear roll run too... heh
With practice you'll have a good feel for when to release that clutch that you can break loose tires from a roll. It's pretty dramatic to go from 6th to 3rd, and depending on the speed you can pull a 2nd gear roll run too... heh
#32
Try to get the rev match done quickly. You want to keep the drivetrain from "shocking" the engine to it's rpm at the same time not cause any significant wear. Hence revmatch + quick release of the clutch. You know you've done it right when you don't get jerked around by the car losing/gaining speed from a mismatched rpm. If done right, the car keeps moving at roughly the same speed and the exhaust note screams. For your first few attempts, try it at low speed and ease into it. Once you get the hang of it though, you just slip the clutch at the appropriate rpm, not ease.
General rule of thumb would be each gear requires roughly 1/3 more rpm than the previous one. Skipping 2 gears needs close to double the rpm usually.
Take the difference between 6th and 4th gear 0.5 ratio vs 1.00 ratio, effectively double the rpm and you've rev matched it.
5th and 3rd have a similar relationship too, but it's less than double, like 1.74 times the rpm.
Most cars you encounter on the road won't require any more than a 5th downshift to embarrass them. 4th gear rolls will take out most ricers. 3rd is for any real enthusiast, ricer or not. 2nd gear roll is reserved for the "oh **** this guy has a faster car for sure".
If you can keep ratios like add a third of the rpm per downshift or double the downshift
General rule of thumb would be each gear requires roughly 1/3 more rpm than the previous one. Skipping 2 gears needs close to double the rpm usually.
Take the difference between 6th and 4th gear 0.5 ratio vs 1.00 ratio, effectively double the rpm and you've rev matched it.
5th and 3rd have a similar relationship too, but it's less than double, like 1.74 times the rpm.
Most cars you encounter on the road won't require any more than a 5th downshift to embarrass them. 4th gear rolls will take out most ricers. 3rd is for any real enthusiast, ricer or not. 2nd gear roll is reserved for the "oh **** this guy has a faster car for sure".
If you can keep ratios like add a third of the rpm per downshift or double the downshift
#33
if you are just worried about a Civic go to 4th. For that matter just go to 4th the 1st time if you think you'll have a few runs just to see what you're up against. Then if necessary rev match and punch it in 3rd
#37
TECH Apprentice
iTrader: (84)
Join Date: Jun 2007
Location: Cleveland, TX.
Posts: 387
Likes: 0
Received 0 Likes
on
0 Posts
[QUOTE=ls1ssws6;8596449]droppin to 2nd at 75...is that ok for the stock tranny????
Probally not. but i run my car out to 7,400. Actually i know its not good for the stock tranny cause mine is broke right now LOL
Probally not. but i run my car out to 7,400. Actually i know its not good for the stock tranny cause mine is broke right now LOL
#39
[QUOTE=2001AntiVenom;8602749] well i know not to listen to your advice anymore haha just messin
do 4.10s take away from low end power at all? what is the benefit for having 4.10s?
yea there is a new (less than 3k miles) tex oz 700 clutch in there now so hopefully itll hold up pretty good while i learn
Just to throw this in there, I wouldn't recommend going WOT in any gear at a very low RPM. You will burn your clutch up quicker.
And ALWAYS rev match unless you want to have to replace the clutch soon, or possibly the tranny, driveshaft, or rear end very soon.
And ALWAYS rev match unless you want to have to replace the clutch soon, or possibly the tranny, driveshaft, or rear end very soon.
#40
TECH Junkie
iTrader: (5)
Join Date: Feb 2007
Location: Key West, Florida
Posts: 3,183
Likes: 0
Received 0 Likes
on
0 Posts
here's the handy dandy gear/speed calculator...
should give you an accurate list of speed @ rev limits to go off of.
and really when rev matching....as long as you get the engine revs increasing...its better than decreasing.
you don't have to worry so much about getting the revs matched...since in a race situation you should be paying attention to the road.
but to keep wear down o n the clutch...get the engine speed increasing.
otherwise the physics are like this
release clutch...flywheel is decelerating....shift to lower gear...egage clutch...friction has to basically stop the decelerating momentum and initiate positive momentum. much more shock to the system.
imagine jumping on one of those "moving sidewalks" at the airport. going against the flow throws your stride off...going with it is not so bad.
should give you an accurate list of speed @ rev limits to go off of.
and really when rev matching....as long as you get the engine revs increasing...its better than decreasing.
you don't have to worry so much about getting the revs matched...since in a race situation you should be paying attention to the road.
but to keep wear down o n the clutch...get the engine speed increasing.
otherwise the physics are like this
release clutch...flywheel is decelerating....shift to lower gear...egage clutch...friction has to basically stop the decelerating momentum and initiate positive momentum. much more shock to the system.
imagine jumping on one of those "moving sidewalks" at the airport. going against the flow throws your stride off...going with it is not so bad.
Last edited by teke184; 01-31-2008 at 12:39 PM.