Cruise / fuel economy cam angle choices

Razathorn · Post by **Razathorn** » Sat Jul 01, 2006 4:50 pm

I seem to remember that 22 degrees cam for cruise was about the best setting for fuel economy -- is this the case? The cam angle choices in the jrsc 9psi calibration are 30 for cruise. I decided to lock my cam in the cruse to 15, 20, 25, and 30 degrees and use cruise control on the highway to datalog going between two points on the highway at the same regulated speed. the results seem to indicate that 20 and 25 degrees cam use less fuel than 30 or 15 to maintain 65 mph. I looked at average rpm vs the average injector duty cycle.

IT1ONBOOST · Post by **IT1ONBOOST** » Sat Jul 01, 2006 4:54 pm

Razo..U on aim?

Razathorn · Post by **Razathorn** » Mon Jul 03, 2006 10:18 am

Any clarification from hondata on this would be great.

Post by **Hondata** » Mon Jul 03, 2006 2:46 pm

Depends on the cam and the exhaust restriction. My tests on the dyno showed that around 15 degrees or 50 degrees worked. Look up the Honda Tuning article from late last year.

Razathorn · Post by **Razathorn** » Tue Jul 04, 2006 9:28 am

Hondata wrote:Depends on the cam and the exhaust restriction. My tests on the dyno showed that around 15 degrees or 50 degrees worked. Look up the Honda Tuning article from late last year.

Do you have a link to this article? Hondatuning's website has *no* dates on articles and searches for hondata only return really old stuff.

thesilverbullet · Post by **thesilverbullet** » Sun Jul 09, 2006 6:54 am

around 30 degrees according to kmanager's help screens

At cruising rpm and load (columns 2 - 7 and 1500 - 4500 rpm) set the cam angle to around 30 degrees. The EGR effect of the extra camshaft overlap will reduce emissions and improve fuel economy at cruise.