Whats that sound
04-27-2003, 05:51 PM
#1
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Whats that sound
I own a 2000 impreza 2.5rs...its got about 20000 miles on it...mostly stock...for now.anyway i was wondering what is the best and/or fastest way to launch....cuz something didnt sound right when i tried something new....i floored the gas pedal and side stepped the clutch then i heard a loud clunk come from the transmision....well more like a loud smash clunk sound...is that normal? im young and i just started driving so i dont know very much about that kinda stuff...so anyone who knows what ther talking about is more than welcom to explain what the noise is
Thank you
Thank you
04-27-2003, 06:37 PM
#3
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hmmmm... might have actually been the center dif transfering power to the front wheels not so gracefully! Personally I would not do clutch drops with ANY Subaru. These cars are not like FWD or RWD vehicles! You can put much more power to the street than any non-AWD vehicle. Something has to give when you do big clutch drops and often times with AWD its not the tires! I believe your car is still under warrantee and if you bring it in with a junk transmission because of dumping the clutch they WILL NOT honor your warrantee! They can tell and they will give you a big bill to replace your trans., diffs, CV joints or whatever else you destroy.
04-27-2003, 07:05 PM
#4
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Car Info: 02 Impreza WRX sedan
Originally posted by incubus587
i floored the gas pedal and side stepped the clutch then i heard a loud clunk come from the transmision....well more like a loud smash clunk sound
If nothing broke, you might have heard the pinion snubber hit the rear differential. It might also do this on hard upshifts.
Dropping the clutch off the line is pretty hard on the drivetrain. Slipping the clutch just enough for a quick start is more forgiving but will shorten the life of the clutch. It's still cheaper than rebuilding the tranny, though.
--
0==WW==0
"…axles of evil…" - george w. bush
i floored the gas pedal and side stepped the clutch then i heard a loud clunk come from the transmision....well more like a loud smash clunk sound
If nothing broke, you might have heard the pinion snubber hit the rear differential. It might also do this on hard upshifts.
Dropping the clutch off the line is pretty hard on the drivetrain. Slipping the clutch just enough for a quick start is more forgiving but will shorten the life of the clutch. It's still cheaper than rebuilding the tranny, though.
--
0==WW==0
"…axles of evil…" - george w. bush
04-27-2003, 10:12 PM
#8
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Like they said, it's a traction thing. Think of it this way: In a FWD or RWD vehicle, when you sidestep a clutch, all the power the motor makes is placed on 2 wheels. If the car is powerful enough, you will break traction and spin the tires. This DECREASES the torque that is applied to the drivetrain, which makes you go slower but also relieves some of the mechanical stress you placed on the drivetrain. That means that the motor/tranny doesn't move in their mounts as much.
In a Suby, when you sidestep, you place all that power on 4 wheels. What that means is that per tire, you are actually putting less power down. In this case, the amount of torque applied to the drivetrain will probably NOT be reduced from tire spin, because your not able to overpower the tires. Hence, the drive train must move to absorb all the torque the engine produces, in some cases producing enough movement to cause a snubber to bottom, or top, out making a noise. Or it could just be the center diff protesting it's dislike of that action.
Any way you look at it, unless you have done the appropriate upgrades to the drivetrain to allow it to handle that kind of 'abuse', you could be looking at a significantly reduced lifespan for your drivetrain.
IMHO
Finn
In a Suby, when you sidestep, you place all that power on 4 wheels. What that means is that per tire, you are actually putting less power down. In this case, the amount of torque applied to the drivetrain will probably NOT be reduced from tire spin, because your not able to overpower the tires. Hence, the drive train must move to absorb all the torque the engine produces, in some cases producing enough movement to cause a snubber to bottom, or top, out making a noise. Or it could just be the center diff protesting it's dislike of that action.
Any way you look at it, unless you have done the appropriate upgrades to the drivetrain to allow it to handle that kind of 'abuse', you could be looking at a significantly reduced lifespan for your drivetrain.
IMHO
Finn
04-27-2003, 10:28 PM
#9
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Car Info: 02 Impreza WRX sedan
Originally posted by incubus587
Why does it do that?
Torque reaction causes the front of the rear differential housing to rotate upward during hard acceleration. I think it has something to do with the way the pinion and ring gear inside the housing mesh with each other and acceleration makes the pinion gear want to 'climb' the ring gear when traction is good. The snubber is a safety device and isn't really meant to make contact with the rear end on a regular basis. It prevents the differential housing from rotating too far which can cause breakage of parts because of the extreme pinion angle.
--
0==WW==0
"…axles of evil…" - george w. bush
Why does it do that?
Torque reaction causes the front of the rear differential housing to rotate upward during hard acceleration. I think it has something to do with the way the pinion and ring gear inside the housing mesh with each other and acceleration makes the pinion gear want to 'climb' the ring gear when traction is good. The snubber is a safety device and isn't really meant to make contact with the rear end on a regular basis. It prevents the differential housing from rotating too far which can cause breakage of parts because of the extreme pinion angle.
--
0==WW==0
"…axles of evil…" - george w. bush
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