I installed an adjustable cam gear. How many degrees do I advance for driving safely on 93? I originally got my cam gear for tuning on a camshaft that I will get later on.

 

depends on your AFR...just go a few degrees at a time until it knocks, then back it off 2-3 degrees...

 

Right now I'm at 7 degrees advance. I was told that 3 bumps on the camshaft gear, which actually is about 12 13 degrees.

 

how lean is your AFR?

 

Stays on 14.7 but richens up sometimes

 

what's it at wide open throttle under load? shouldn't be that lean...maybe 13.7...

 

Yup gets in the 13's. But right now I'm on 89 working it to 93. Is it suppose to lean out when it gets more advance?

 

it shouldn't lean out due to timing because you're controlling the fuel with the piggyback...but more advance and leaner AFR together will do one of two things, make more power, or knock, and when it knocks the ECU will pull timing electronically and you'll lose power...

 

Well I'm going to pay close attention to my AFRs and see and play with the advancement and put 93 this weekend. When I get a camshaft will this advancement be a problem?

 

you should start over if you're increasing lift and duration...

 

With the new cam in I would set it to its default position and start playing again with it. With the stock cam and the OBX cam gear I've seen gains of 5hp on the dyno when advancing 3 marks (6 degrees).

Off topic: Since you are talking about 93octane....How frequent do you guys now get or see 93octane at the pump. Here we had it until a few months ago and now we only get 87 and 91.

 

here in Canada 94 is very common, though between my town, and the next town over i only know of 3 stations that have it, but i could get it whenever i want...

i'm tuned for 91, and pretty much every station has it...

guys around here running 94 and meth are making big power with 6 bolt 4G63's...like 600awhp...that would be an interesting swap...GST motor and trans in a lancer...DSM motors and JDM equivilent are pretty easy to find...i should do that with my other lancer, and do a FWD EVO 7 clone...

 

91 is good enough for tuning but its a pain for people to retune after so many years with 93octane to go lower to 91. The good thing is that a Sunoco station opened up really close to here and its the only place with 100octane pump gas ever. Never had gas like that here, thing is that it costs $9.92 per gallon. Not that we need that but it's useful for a track day for those DSM's

 

94 octane is like 3 cents more a liter than 91 so that's what I get since I don't have to drive 100 km each way to work now so a few extra dollars a week doesn't matter. Some guy on maxima.org documented, with pictures, the difference in his engine internals and sensors between using high octane versus 87 puddle water - it was really well done - I'll search for the link this weekend. It turns out the overall cost benefits favoured using 91.

I know, some eyes are rolling, "just use 87 you'll never notice 'cause you don't have an evo you loser", but the Hackish tune requires 91, the extra cleanliness matters over the years, and the track has very high temps sometimes, so...

The adjustable cam gear is very interesting, thank you for posting about it.

 

You have a valid point there but most brand gas stations have fairly decent 87octane. Shell, Chevron and Total are the most brand name stations I can find here and they do offer their "premium" 91 octane that has their detergents but their regular also carry some of it. What I would watch out is for no brand generics and old gas stations. I would only buy higher octane to avoid knock with tunning etc etc etc....Just redline it to burn up those carbon deposits

Kinda interested with that link your suggesting though