MustangForums.com

General Tech Ask model specific questions in the appropriate category below. All other general questions within.
Sponsored by:
Sponsored by: DashLynx

1/4 shifting RPM??

Thread Tools
 
Search this Thread
 
Old 07-07-2010, 12:13 PM
  #1  
dannyroblez
Thread Starter
 
dannyroblez's Avatar
 
Join Date: May 2010
Location: NM
Posts: 36
Default 1/4 shifting RPM??
Hey guys i have a '90 Mustang GT all stock except for a few mods like valve covers and spark plugs and wheels and stuff, anyways i know the specs are 225 HP @ 4000 RPM and 300 Ft. lb of torque @ 3000 RPM. My question is what RPM are you guys shifting at when ya'll do ya'll quarter mile time? It's a little confusing when the HP peak is at 4000 RPM yet the tach goes all the way to 7000 RPM and it doesn't start to redline until about 5800-5900 RPM.
dannyroblez is offline  
Reply
Old 07-07-2010, 08:11 PM
  #2  
JD1969
Pro. B.S. caller outer
 
JD1969's Avatar
 
Join Date: May 2004
Location: IL
Posts: 9,644
Default
Shift it at 4800 rpm.
JD1969 is offline  
Reply
Old 07-07-2010, 09:06 PM
  #3  
coondogg
1st Gear Member
 
coondogg's Avatar
 
Join Date: Jul 2008
Posts: 87
Default
Just cause the tach goes to 7k doesnt mean that the engine stops making power there. Try 9k and watch your et drop!
coondogg is offline  
Reply
Old 07-09-2010, 12:34 AM
  #4  
Stang9946
4th Gear Member
 
Stang9946's Avatar
 
Join Date: May 2005
Location: New York
Posts: 1,648
Default
Originally Posted by coondogg
Just cause the tach goes to 7k doesnt mean that the engine stops making power there. Try 9k and watch your et drop!
Watch the motor drop
Stang9946 is offline  
Reply
Old 07-09-2010, 02:30 AM
  #5  
67mustang302
6th Gear Member
 
67mustang302's Avatar
 
Join Date: Apr 2007
Location: California
Posts: 10,468
Default
Originally Posted by Stang9946
Watch the motor drop
...parts out the bottom.
67mustang302 is offline  
Reply
Old 07-09-2010, 03:13 PM
  #6  
1SVTLVR
2nd Gear Member
 
1SVTLVR's Avatar
 
Join Date: Feb 2009
Location: Virginia
Posts: 266
Default
Originally Posted by coondogg
Just cause the tach goes to 7k doesnt mean that the engine stops making power there. Try 9k and watch your et drop!
Thanks for the incorrect and useless insight. Wouldn't be upset if you didn't post anymore.
1SVTLVR is offline  
Reply
Old 07-09-2010, 04:00 PM
  #7  
Timspony
SVT Section Moderator
 
Timspony's Avatar
 
Join Date: Jul 2008
Location: Burnt Hills, NY
Posts: 15,601
Default
....shift at 5,500 rpms and go from there! What's the engine timing at?
Timspony is offline  
Reply
Old 07-09-2010, 09:41 PM
  #8  
JD1969
Pro. B.S. caller outer
 
JD1969's Avatar
 
Join Date: May 2004
Location: IL
Posts: 9,644
Default
Forget about redline, a stock cam, stock valve spring 5.0 will float valves right around 5000 rpm, shifting higher will make it slower, shift it at 4800-4900 rpm.
JD1969 is offline  
Reply
Old 07-10-2010, 12:37 AM
  #9  
Bladerunner
2nd Gear Member
 
Bladerunner's Avatar
 
Join Date: Jul 2010
Location: Adams,MA
Posts: 454
Default
I would try shifting at 4900 rpm and see how that works out.
Bladerunner is offline  
Reply
Old 07-10-2010, 03:04 AM
  #10  
67mustang302
6th Gear Member
 
67mustang302's Avatar
 
Join Date: Apr 2007
Location: California
Posts: 10,468
Default
Originally Posted by JD1969
Forget about redline, a stock cam, stock valve spring 5.0 will float valves right around 5000 rpm, shifting higher will make it slower, shift it at 4800-4900 rpm.
^ This
67mustang302 is offline  
Reply



Advanced Search
Quick Reply: 1/4 shifting RPM??


Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 04:35 PM.