Rev Match?
Racer
Joined: Mar 2014
Posts: 321
Likes: 84
From: Marco Island FL
I'm not an expert but I do own an A8 and believe it does work with an auto. Try using the paddles to downshift from say 4th to 2nd quickly, you will hear and feel the car revmatch. But be prepared to be surprised and jolted as the gears kick in. I could be wrong about this and what I have experienced could very well be called something else in the A8 toolbox!
also, on an M7 car it is my understanding that the car can determine from where you are moving the shifter, up or down, it will determine the correct Rev Match to apply.
also, on an M7 car it is my understanding that the car can determine from where you are moving the shifter, up or down, it will determine the correct Rev Match to apply.
You are correct - you are not an expert nor an engineer!
Your belief does not make it a reality.
If you don't believe me - Ask Tadge !
Racer
Joined: Mar 2014
Posts: 321
Likes: 84
From: Marco Island FL
When all else fails - read the manual
1-16
Active Rev Match (Manual
Transmission)
Vehicles equipped with a manual
transmission have Active Rev Match
(ARM).
Read - MANUAL TRANSMISSIONS !
1-16
Active Rev Match (Manual
Transmission)
Vehicles equipped with a manual
transmission have Active Rev Match
(ARM).
Read - MANUAL TRANSMISSIONS !
Last edited by Stangslayer; Sep 12, 2016 at 06:47 AM.
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
You most certainly DO still having "engine braking" w/ rev-match.
Once you've made a downshift, lifting the throttle and being in lower gear, by definition, is going to slow you down quicker than lifting the throttle in higher gear. I think the person who complained about that was perceiving the absence of the forward, head-snapping jolt to be a lack of engine-braking.
I've been rev-matching manually for smooth downshifts for years and for the purpose of engine-braking, without the forward jolt. Rev-matching, whether doing it yourself, or using auto-rev match is also a good way to prolong the life of your clutch.
Once you've made a downshift, lifting the throttle and being in lower gear, by definition, is going to slow you down quicker than lifting the throttle in higher gear. I think the person who complained about that was perceiving the absence of the forward, head-snapping jolt to be a lack of engine-braking.
I've been rev-matching manually for smooth downshifts for years and for the purpose of engine-braking, without the forward jolt. Rev-matching, whether doing it yourself, or using auto-rev match is also a good way to prolong the life of your clutch.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,932
Likes: 12,344
From: NE South Carolina
You most certainly DO still having "engine braking" w/ rev-match.
Once you've made a downshift, lifting the throttle and being in lower gear, by definition, is going to slow you down quicker than lifting the throttle in higher gear. I think the person who complained about that was perceiving the absence of the forward, head-snapping jolt to be a lack of engine-braking.
I've been rev-matching manually for smooth downshifts for years and for the purpose of engine-braking, without the forward jolt. Rev-matching, whether doing it yourself, or using auto-rev match is also a good way to prolong the life of your clutch.
Once you've made a downshift, lifting the throttle and being in lower gear, by definition, is going to slow you down quicker than lifting the throttle in higher gear. I think the person who complained about that was perceiving the absence of the forward, head-snapping jolt to be a lack of engine-braking.
I've been rev-matching manually for smooth downshifts for years and for the purpose of engine-braking, without the forward jolt. Rev-matching, whether doing it yourself, or using auto-rev match is also a good way to prolong the life of your clutch.
As you say the key is to downshift smoothly without the "jolt." That jolt not only is hard on the drivetrain but also "jerks" the rear. That is great if you want to get the rear to side out (oversteer) like trail braking etc. But not good when you don't and are trying to achieve max cornering!I'm reminded of my understeering, front wheel drive Dodge Colt Turbo. [Side Bar: Had to buy it to replace my CJ5 when I moved to CT. When we could only buy gas every other day the CJ could not make it to Lagurdia Airport and back on a tank of gas!] To get the Colt rear to come around and the car pointed in the right direction after a turn, held the button on the emergency brake and modulated the rear brakes to load those tires. As the rear slide out it felt like my old Corvair in a controlled oversteer!
A professional driver testing the C7 at Road Atlanta said he found rev match allowed him to concentrate on his braking spot and not having to make a perfect match to be sure he did not upset the car!
Last edited by JerryU; Sep 12, 2016 at 08:12 AM.
Le Mans Master
Joined: Dec 2012
Posts: 6,442
Likes: 2,535
From: New Jersey
The only thing I don't like about rev matching is I like the engine braking when downshifting instead of using my brakes-hence the reason I do not use rev match full time. other than that it is really a fun thing to play with.
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
Uh, you still have engine braking with rev-matching. Read the two posts directly above yours. You must just enjoy the "jolt," but your car doesn't.
If you are downshifting to slow down without rev-matching, you should be aware that brake pads are pocket change compared to the big dollar cost of replacing a clutch-pressure plate.
If you are downshifting to slow down without rev-matching, you should be aware that brake pads are pocket change compared to the big dollar cost of replacing a clutch-pressure plate.
Last edited by Foosh; Sep 12, 2016 at 08:14 AM.
Le Mans Master
Joined: Oct 2011
Posts: 7,079
Likes: 1,922
From: DFW, Tejas!
Uh, you still have engine braking with rev-matching. Read the two posts directly above yours. You must just enjoy the "jolt," but your car doesn't.
If you are downshifting to slow down without rev-matching, you should be aware that brake pads are pocket change compared to the big dollar cost of replacing a clutch-pressure plate.
If you are downshifting to slow down without rev-matching, you should be aware that brake pads are pocket change compared to the big dollar cost of replacing a clutch-pressure plate.
Le Mans Master
Joined: Dec 2013
Posts: 5,887
Likes: 1,555
From: Calgary Alberta
That is more like "clutch-braking", and "clutch-wearing", and possibly "rear-wheel locking". Please don't do this in the rain.
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Le Mans Master
Joined: Dec 2012
Posts: 6,442
Likes: 2,535
From: New Jersey
Racer
Joined: Sep 2016
Posts: 263
Likes: 50
From: Virginia Beach
Rev match almost got my *** beat in a Wal Mart parking lot the other day...I was pulling into the parking lot and I downshifted while these 2 people (guy and girl with kid in tow) were crossing the parking lot in front of me (pretty far in front of me I might add). So I downshifted and touched the brake and the engine revved a little bit. This guy thought I was revving my engine to his wife and got all irate and threatened to smash the windows if I parked it and told me several times to get out of the car. I tried explaining the rev match to this dirtbag but he was not hearing it...so I went to another Wal Mart. In my younger days things would have been much different. So now I turn off rev match in parking lots.
Last edited by RVC; Sep 12, 2016 at 11:37 AM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,932
Likes: 12,344
From: NE South Carolina
Uh, you still have engine braking with rev-matching. Read the two posts directly above yours. You must just enjoy the "jolt," but your car doesn't.
If you are downshifting to slow down without rev-matching, you should be aware that brake pads are pocket change compared to the big dollar cost of replacing a clutch-pressure plate.
If you are downshifting to slow down without rev-matching, you should be aware that brake pads are pocket change compared to the big dollar cost of replacing a clutch-pressure plate.
Not pushing anyone to use Rev Match, their car do as they wish. However wonder if they may be shifting too slow??One of my best examples where I tried with my C6 and heel-toe and only half the time it was perfect (the other 1/2 OK but not perfect) is my transition from a 4 lane 60 mph limit divided highway near my house to the single, narrow, 25 mph limit lane, one way road a large fountain where I live. I go from 5th and for fun often hit the brakes hard and downshift directly to 3rd before turning in! Lots of engine braking BUT it has to be done quickly.
If that was the Andrette hairpin at Laguna Seca and I was coming into it at ~150 mph, I'd go thru 4th first but at 65 mph, ~2200 rpm and going to only ~4000 the 5th to 3rd is fine!
Last edited by JerryU; Sep 12, 2016 at 11:48 AM.
Burning Brakes
Joined: Dec 2015
Posts: 1,096
Likes: 322
From: Denver Colorado
Rev match almost got my *** beat in a Wal Mart parking lot the other day...I was pulling into the parking lot and I downshifted while these 2 people (guy and girl with kid in tow) were crossing the parking lot in front of me (pretty far in front of me I might add). So I downshifted and touched the brake and the engine revved a little bit. This guy thought I was revving my engine to his wife and got all irate and threatened to smash the windows if I parked it and told me several times to get out of the car. I tried explaining the rev match to this dirtbag but he was not hearing it...so I went to another Wal Mart. In my younger days things would have been much different. So now I turn off rev match in parking lots.
Last edited by joemosfet; Sep 12, 2016 at 12:25 PM.
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
I could construct several very different mental images of what actually happened using the same words, and at least one of them would have made be angry if walking in a parking lot with my wife and child.
At acceptable parking lot speeds, I can't imagine auto rev-match even being audible to a pedestrian. As for me, in a parking lot, I'm crawling at about idle in 1st gear because too many bad things can happen there.
At acceptable parking lot speeds, I can't imagine auto rev-match even being audible to a pedestrian. As for me, in a parking lot, I'm crawling at about idle in 1st gear because too many bad things can happen there.
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
Last edited by Foosh; Sep 12, 2016 at 12:46 PM.
Le Mans Master
Joined: Oct 2011
Posts: 7,079
Likes: 1,922
From: DFW, Tejas!
I could construct several very different mental images of what actually happened using the same words, and at least one of them would have made be angry if walking in a parking lot with my wife and child.
At acceptable parking lot speeds, I can't imagine auto rev-match even being audible to a pedestrian. As for me, in a parking lot, I'm crawling at about idle in 1st gear because too many bad things can happen there.
At acceptable parking lot speeds, I can't imagine auto rev-match even being audible to a pedestrian. As for me, in a parking lot, I'm crawling at about idle in 1st gear because too many bad things can happen there.
I had a construction worker scream at me because I went 4-3-2 pulling up to a tight construction zone.
Looks fast, sounds fast, must be fast.
It's damn near perfect for me. I don't even think about rev matching anymore.
Intermediate
Joined: Apr 2015
Posts: 26
Likes: 6
I describe rev match with 3 words - No engine braking. People with manual trannys know that if you downshift into a gear it can slow you down if the RPMs are below the RPMs needed to maintain the current speed. That's called engine braking. With RM there is no engine braking because the computer matches the RPMs needed to be traveling at this speed as you are going into the gear the computer sensed you are selecting.
I only have a C6, but my understanding of the Rev Match function in the C7s was that it just blips the throttle for you during a shift. After you engage the gear there is no automatic acceleration control at that point, so you would engine brake as usual.