Transmission, Clutches, Shifters Posts regarding Transmissions. Clutches, torque converters, shift kits, Gear ratios, Limited Slip Differentals, etc for your Hyundai

When revmatching is it better to be above or under specified RPM?

Old Dec 15, 2011 | 02:20 PM
  #1  
Space's Avatar
Thread Starter
Member
 
Joined: Oct 2001
Posts: 88
Likes: 0
From: San Diego
Vehicle: 99 Tib
Default When revmatching is it better to be above or under specified RPM?

Say I'm at 2500RPM in whatever gear, this would put me at a hypothetical 4000RPM in the next lowest gear



If I revmatch, is it better to be above or below 4000RPM when I release the clutch? I know it's PERFECT if you do it spot on but does more damage occur at letting the clutch out at say 3750RPM or 4250RPM?
Reply
Old Dec 15, 2011 | 07:13 PM
  #2  
koreancorvette01's Avatar
Senior Member
 
Joined: Oct 2002
Posts: 284
Likes: 1
From: Great Falls, MT
Vehicle: 2001 Hyundai Tiburon Turbo
Default

I would think it would be worse at a higher RPM due to the inersia being released . Lower RPM less centrifugal force for the clutch to grab and hold. Idk my 2 cents.
Reply
Old Dec 15, 2011 | 08:13 PM
  #3  
wheel_of_steel's Avatar
Senior Member
 
Joined: Dec 2008
Posts: 3,837
Likes: 0
From: Floating around the AUDM
Vehicle: X3 Sprint, S-Coupe Turbo
Default

Good question. I guess the same amount of force needs to go through the clutch either way, so as long as you let the clutch out at the same rate both times, the stress would be equal?



My clutch tends to chatter if I rev too low, so it is less comfortable for my passengers.
Reply
Old Dec 15, 2011 | 08:15 PM
  #4  
300D50's Avatar
Senior Member
 
Joined: Oct 2011
Posts: 581
Likes: 0
From: CNY
Vehicle: 2000 Hyundai Tiburon
Default

I always aim for a bit higher if I can't match perfect.
Reply
Old Dec 15, 2011 | 08:21 PM
  #5  
Stocker's Avatar
Super Moderator
 
Joined: Sep 2001
Posts: 10,795
Likes: 5
From: Pflugerville, TX
Vehicle: 2000 Elantra
Default

I don't worry about damaging the drivetrain so much as whether I'm going to be jerked forward or back. If you want to lurch forward, rev lower. If you want to be jerked back in your seat, rev higher. The other consideration is traffic ahead of you - if you are trying to brake to avoid a collision, rev lower.
Reply
Old Dec 15, 2011 | 09:29 PM
  #6  
WytchDctr's Avatar
Super Moderator
 
Joined: Dec 2001
Posts: 1,792
Likes: 0
From: Houston, Texas
Vehicle: 14 EGT 2.0
Default

damage? high... your clutch has to slow the engine down if you are above the engagement point RPM. You will bog a little if you go low, but I don't see it hurting anything and do the jerk thing already mentioned. However, each are sort of meh.. compared to not doing it at all. I go a little high because... MOR POAWA
Reply



All times are GMT -6. The time now is 06:27 AM.