HOME MAGAZINE FORUM RULES SPONSORS CONTACT
     
   
   
 
Go Back   CLASS RACER FORUM > Class Racer Forums > Bracket Racing

Reply
 
Thread Tools Display Modes
Old 10-29-2018, 01:02 PM   #1
Sam Ehret
Junior Member
 
Sam Ehret's Avatar
 
Join Date: Jul 2014
Posts: 14
Likes: 0
Liked 0 Times in 0 Posts
Default altitude change problem

When I race at Tuscon, el. 3300 ft and DA of 5000 ft I can hook the car and am consistent with 60 ft times. 10.8's at 125 mph(5200 da)
I'm having a problem blowing tires off in Phoenix that is 1200 ft and usually has a DA of 2500-3000 ft. best 10.68 at 125 mph(2200 da).
What should I do different in Phoenix?
Sam Ehret is offline   Reply With Quote
Old 10-29-2018, 05:12 PM   #2
Jeff Stout
Senior Member
 
Join Date: Dec 2001
Location: phoenix
Posts: 665
Likes: 0
Liked 0 Times in 0 Posts
Default Re: altitude change problem

I'm guessing your tune up is set for Tucson? Im usually .25 to .28 faster in Phx. and about 3.5 MPH faster also. Im the opposite and set up for Phx air Sounds like its lean and excessive timing in Phx altitude in which helps bottom end power but hurts the rest of the pass. Just guessing
Jeff Stout is offline   Reply With Quote
Old 10-29-2018, 05:24 PM   #3
Jeff Stout
Senior Member
 
Join Date: Dec 2001
Location: phoenix
Posts: 665
Likes: 0
Liked 0 Times in 0 Posts
Default Re: altitude change problem

Looked up in my log book and found similar DA numbers and at 3000 difference I was .22 faster in Phx. I have changed timing and opened valve lash to compensate when its really bad in Tucson.
Also converter acts different and track prep will come into play.
Jeff Stout is offline   Reply With Quote
Old 10-29-2018, 05:34 PM   #4
Sam Ehret
Junior Member
 
Sam Ehret's Avatar
 
Join Date: Jul 2014
Posts: 14
Likes: 0
Liked 0 Times in 0 Posts
Default Re: altitude change problem

Thanks Jeff, I was considering adding a carb spacer in Phoenix, along with a couple thou tighter lash. Tire pressure and shock adjustment don't seem to help. I think the track is worse at WHP.......just guessing....Ill try a bit less timing also

Last edited by Sam Ehret; 10-29-2018 at 05:41 PM.
Sam Ehret is offline   Reply With Quote
Old 11-06-2018, 03:16 PM   #5
RobbieRacer
Member
 
RobbieRacer's Avatar
 
Join Date: Jul 2012
Location: Phoenix, Az
Posts: 225
Likes: 0
Liked 0 Times in 0 Posts
Default Re: altitude change problem

If your there for Drag and Drift night, it's the track. At Team races and big events it hooks pretty good.
__________________
Building U/SA
79 Mustang
RobbieRacer is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:08 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.Ad Management plugin by RedTyger