I have always used downshifting for slowing down, try not to be too hard on the car though.
Yesterday coming off the interstate downshifting thru gears I was a little more aggressive than usual and hit around 4200 or maybe a bit more on the third to second gear shift.
Got to thinking about it and wondering is that harmful to the motor or rest of driveline. I know in theory it surely would be, but in reality how bad is it really ?
I know the netural rev limiter is set low to keep neutral RPMs from being too high when motor is not under load. Is the high RPM downshifting the same as not being under load ?
How high do RPMS hit for the rest of you guys with manual tranny's when downshifting ?
I was under the impression that as long as you didn't over-rev the engine, you would be okay. I think the V6 rev limiter is set at 5500 right? Then again i have a GT auto so i am not much help
I have always used downshifting for slowing down, try not to be too hard on the car though.
Yesterday coming off the interstate downshifting thru gears I was a little more aggressive than usual and hit around 4200 or maybe a bit more on the third to second gear shift.
Got to thinking about it and wondering is that harmful to the motor or rest of driveline. I know in theory it surely would be, but in reality how bad is it really ?
I know the netural rev limiter is set low to keep neutral RPMs from being too high when motor is not under load. Is the high RPM downshifting the same as not being under load ?
How high do RPMS hit for the rest of you guys with manual tranny's when downshifting ?
Lol, I don't think I've ever downshifted in my mustang...seriously lol.. not once! , I always just shift into neutral and let it float...
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2008 V6 Performance White Mustang, Manual Transmission, C&L TrueFlow CAI, Diablosport Predator Tuned, Screamin' Demon Coil and Live Wires, Bosch +2 Spark Plugs, GT Fog Light Conversion Grille, Pypes True-Dual Exhaust with Street Pros.
I was under the impression that as long as you didn't over-rev the engine, you would be okay. I think the V6 rev limiter is set at 5500 right? Then again i have a GT auto so i am not much help
Wait, is there a rev limiter? I have a tune on my car, that didn't remove it did it? I like to have one...
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2008 V6 Performance White Mustang, Manual Transmission, C&L TrueFlow CAI, Diablosport Predator Tuned, Screamin' Demon Coil and Live Wires, Bosch +2 Spark Plugs, GT Fog Light Conversion Grille, Pypes True-Dual Exhaust with Street Pros.
Thats why you bought a Manual, at least thats why I did. I love down shifting in and out and around corners. Whether you are popping the clutch or the opposite of popping the clutch for downshifts you are working the clutch harder and shortening lifespan. Everytime you start the engine you are causing some wear and tear damage to the engine internals. The engine is definetly under load during downshifts, I guess it could be a negitive load as opposed to a positive load , but there is definetly a load. As for what RPM's I use when downshifting? Whatever it takes! 4-5000 rpm's is a big downshift, but these cars are serious fun in that RPM range. It may not be the best thing for the car, but it always makes my heart feel good.
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2008 GT Vert, Manual, Perf. White, Red Leather, Black Cloth Top, I-UP, Active Alarm, HID's, Heat'd Seats, GT Scoop, Sirius, Ford Nav, 18" Polished Aluminum Rims w/ Pony's, Ambient Lighting, Gentex Mirror (Electro/Comp/Temp/Homelink), Jaeger Flaps.
you didnt do any damage, think about it, people run their cars down the track week after week and they go past the rpm range you mentioned and they dont break, sure some cars do eventually but it could be the way the driver shifts or it could be poor installation, bad conditions, etc.
In short... your cars fine
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2006 V6 Pony Package Premium -Mods: 61mm Powerhouse Turbo and Intercooler, Evolution Dyno Tune(Jon Lund), Steeda Performance Shorty Headers. Current Numbers: 350 rwhp/420 torque @ 8.3 psi (low boost)
415 rwhp/470 torque @12 psi Car died 6/23/09
New Set Up: 4.6 3v With Manual Trans, Bolt Ons
Wait, is there a rev limiter? I have a tune on my car, that didn't remove it did it? I like to have one...
Well your tuner can remove the rev limiter or adjust it to a different setting. Its probably smart to keep a rev limiter, you can always forget to shift for one reason or another. You can check on your tuner to see what the rev limit is by going through the options for the tune.
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2006 V6 auto with the pony package
adding to it everyday
I down shift to slow down all the time, but I usually only get the rpms up to 2500 to 3000. The only thing I know that it will put more wear and tear on is the clutch, but it is a trade off since you put less wear on the breaks.
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2008 Grabber Orange GT premium, 5 speed manual, 3.31s
Diablosport Predator Tuner and Bamachips tunes (93 Race, Torque, and Preformance), Boom Tubes
Kooks LT headers and catted H pipe, Steeda UDPs, delete plates, UCAs, LCAs, and Panhard brace, all waiting on time to install them
Wait, is there a rev limiter? I have a tune on my car, that didn't remove it did it? I like to have one...
I doubt if your who ever tuned your mustang would have removed the rev limiter. You can change the rev limiter with your tuner. I haven't hit the limiter yet, but it is nice to know it is there just in case.
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2008 Grabber Orange GT premium, 5 speed manual, 3.31s
Diablosport Predator Tuner and Bamachips tunes (93 Race, Torque, and Preformance), Boom Tubes
Kooks LT headers and catted H pipe, Steeda UDPs, delete plates, UCAs, LCAs, and Panhard brace, all waiting on time to install them
The item that takes the most stress potentially are the springs in your clutch pressure plate so take it easy on them. It helps if you have lightened the drive line with a aluminum flywheel so your engine revs faster when you blip the throttle to more closely match flywheel-pressure plates speeds. My stock driveline does not respond fast enough for my tastes due to the heavy stock flywheel. It ( the driveline weight) also accounts for too much horsepower driveline loss that I would rather have going to my rear wheels.
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Current vehicles
2005 Mustang V6 coupe mineral grey
2001 Corvette Z06 black
1968 Corvette convertible metallic blue
1964 Corvette Stingray convertible red
1985 BMW K100 m/c black
Downshift RPM's 
(Mods in profile)
, I always just shift into neutral and let it float...
, but there is definetly a load. As for what RPM's I use when downshifting? Whatever it takes! 4-5000 rpm's is a big downshift, but these cars are serious fun in that RPM range. It may not be the best thing for the car, but it always makes my heart feel good
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It helps if you have lightened the drive line with a aluminum flywheel so your engine revs faster when you blip the throttle to more closely match flywheel-pressure plates speeds. My stock driveline does not respond fast enough for my tastes due to the heavy stock flywheel. It ( the driveline weight) also accounts for too much horsepower driveline loss that I would rather have going to my rear wheels.
