View Single Post
  #8  
Old 11-27-2018, 11:34 AM
JLMounce JLMounce is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: Greeley, Colorado
Posts: 3,775
Send a message via AIM to JLMounce
Default

Quote:
Originally Posted by Firebob View Post
Jason, why so lean at cruise? I think I'm at around 13:1 AFR at cruise. Even with perfect gas they say 14.7 is the most efficient combustion point.
It's what my car likes, no other reason. Downhill nearly off throttle it runs at around 30kpa on the map and right at about 15:1. Cruise ends up being anywhere between 14.4 and 15:1 depending on the load. The car likes 14.1 at idle.

With 3.73's, 26" tires and no OD, I'm getting about 16 mpg out of the thing. If I would get off my ass and convert the setup to timing control, I could probably better that by another mpg or two.

__________________
-Jason
1969 Pontiac Firebird