High elevation 22R and 22RE tuning

[dorton]

I'm curious as to what you all do to help with elevation. Around here my base timing with the pins jumped is 7 degrees before spark knock starts. My daily driving ranges from 900-600 ft elevation. When I went to Colorado, I took everything I needed.....but a timing light. Looking back, I really wish I would have been able to tinker with it. At 7000 ft +, mine really really felt weak. Playing at around 13000 ft one time, I had to clutch it while holding it almost wide open on an obstacle that here that would have been just over idle. I understand the thinner air will make less, but I also know how much difference a couple degrees of timing made around here. Are you guys used to it, or do you tune around it?

What have you done to yours?

 

[KidVermicious]

Good topic.

I'm generally anywhere from 4500 to 7000 feet. I've pushed mine as far as 15 on regular and didn't ever get any knock. I also didn't notice it perk up significantly, so I backed it off to 10 BTDC and that's where I leave it. Good to know that I might have to back that off or run higher octane if I travel to lower elevations!

Out of curiosity, were you running regular? Did you notice that regular octane in CO is 95? You normally run 97 octane, right? I wonder if you started knocking on 95 octane and your knock sensor retarded your timing bad enough to gimp your motor.

 

[dorton]

Our fuel grades here run from 87 for Regular 89-91 Mid Grade 92-93 High.

On 87 at 8 deg jumped, I get spark knock, at 7 I do not.