why would my rpms change after cam install?
08-22-2007, 10:47 AM
#1
TECH Fanatic
Thread Starter
iTrader: (2)
Join Date: Aug 2006
Location: Bryant, AR
Posts: 1,008
Likes: 0
Received 0 Likes
on
0 Posts
why would my rpms change after cam install? Well after i installed my hotcam and got a chance to take it around the block once or twice i noticed that my rpm and gear changes were different. I also had the car tuned during this time and the underdrive pully was removed.
Before the cam i would run around town in 5th gear, 45mph and 1500 rpms.
After the cam i now have to do 2100 rpms in 5th to obtain 45mph.
Now remember the only changes were the under drive was removed, tuned and hotcam was installed. I do run 4:10's but they have been in the car for years. Could a clutch thats getting worn out cause this effect? is my motor really pushing that much power that my stock clutch is constantly slipping? ( cause that would mean im pushing a crap ton of power which i dont believe i am )
Before the cam i would run around town in 5th gear, 45mph and 1500 rpms.
After the cam i now have to do 2100 rpms in 5th to obtain 45mph.
Now remember the only changes were the under drive was removed, tuned and hotcam was installed. I do run 4:10's but they have been in the car for years. Could a clutch thats getting worn out cause this effect? is my motor really pushing that much power that my stock clutch is constantly slipping? ( cause that would mean im pushing a crap ton of power which i dont believe i am )
08-22-2007, 11:49 AM
#5
TECH Resident
iTrader: (1)
Join Date: Sep 2005
Location: Elko MN
Posts: 833
Likes: 0
Received 0 Likes
on
0 Posts
it was probably never tuned for the 4.10's in the first place, i just checked my spread sheet and 4.10's with the stock diameter tire comes in at about 1800 rpm and being is how every stock tach i have seen reads atleast 150-200 rpm high that could probably explain why your seeing 2100 rpm at 45 mph now
Trending Topics
08-23-2007, 06:42 AM
#10
TECH Resident
iTrader: (3)
Join Date: Oct 2006
Location: Charleston, West Virginia
Posts: 855
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ryanisfast
if your clutch is slipping you will know it. there won't be any question about it. You'll punch it hear the rpms go up and the car will slowly follow the revs.
exactly
