Welcome to our Buell forum and performance parts shop!

Posted:  19 Feb 2007 01:01	[?]
Registered User Currently Offline Join Date: Feb 2007	Posts:  3 Reputation: Unranked [?] User Rank: Second Lieutenant
Just had a directlink look at my fuel maps. It seems to me the rear cylinder is set up leaner than the front. Anyone know the whyfors and wherefors regarding fr and rear maps? All opinions, experience, knowledge, appreciated thanks

Posted:  19 Feb 2007 01:25	[?]
Moderator Currently Offline Join Date: Oct 2006	Posts:  1614 Reputation:  21 [?] User Rank: Four-Star General
It has some to do with the fact that the rear cylinder experiences more heat than the front cylinder.

Posted:  19 Feb 2007 03:01	[?]
Registered User Currently Offline Join Date: Feb 2007	Posts:  3 Reputation: Unranked [?] User Rank: Second Lieutenant
Normally if you want to knock a few degrees of a cylinder you would fatten up the top end a bit. The whole map is generally richer. My initial thoughts were the directlink got the fr and rear mixed up. I originally did this because I thought the bike was running a touch rich in the midrange when operating closed loop. Considering the closed loop operation uses the rear cylinder as a reference, maybe its the fr cylinder that is rich rather than the rear being lean. The only other thing is some oddball effect re cam timing? I will use the rear map on the front and see what happens! cheers

Posted:  18 Jun 2008 04:43	[?]
Registered User Currently Offline Join Date: Jun 2008	Posts:  16 Reputation: Unranked [?] User Rank: Second Lieutenant
In any twin, one cylinder always runs hotter, this thier way of compensating

Posted:  18 Jun 2008 09:48	[?]
Moderator Currently Offline Join Date: Jun 2007	Posts:  2345 Reputation:  46 [?] User Rank: Five-Star General
yea, the rear is always set leaner...have no clue why, though.

Posted:  18 Jun 2008 13:59	[?]
Registered User Currently Offline Join Date: May 2007	Posts:  105 Reputation:  2 [?] User Rank: Captain
its because of air temps and header design.. . "the front cyl is cooler. a colder air charge is denser, needs more fuel" you can tune the rear cyl map (its got the 02), copy it to the front then add 2 points over the whole map. this is with ECMSpy, not sure if the value of '2' would be the same in the directlink world. but the front map needs to be richer. if you can get another bung welded to the front pipe, you could tune both individually. this is optimal.

Professional Web Design and eCommerce Optimization by Slingshot SEO 1.04, RSS 2.0 Atom 1.0

Buell Forum Home           Buell Specs           Buell Links           Firebolt Buell Parts           Lightning Buell Parts           1125R Buell Parts          
Blast Buell Parts           Buell Parts Shop           Contact Us