ITRCA

i run a 00' ITR with many modifications and it seems to knock on 93/94 octane. So i run half premium and half 110 through it. I was wondering how much faster i will burn up O2 sensors if any and if i do is there a better one for this type of application. Any help is appreciated.. Thanks in advance...Ryan

Why is your motor knocking on 93 and 94 octane? Is your timing too advanced? Higher than stock compression? Or lack of tuning.

I assume you are using leaded 110 race fuel, this will contaminate the sensor quickly, you might delay it a bit by doing the mix you are talking about - but you shouldn't need 110 anyways unless you are running 12 to 1 compression or boost.

BTW, is this Canuck R by any chance

turn back your timing and run 93 without knock

i think with the stage 3 cams and slightly milled head it is wise to run advance to avoid piston to valve hitting dont y ou

00ITR wrote:i think with the stage 3 cams and slightly milled head it is wise to run advance to avoid piston to valve hitting dont y ou

retarding the timing via the distributor will cause this? news to me.

Distributor timing as Dave has pointed out does not affect piston to valve cleanrance. What it is doing is causing your detonation.

What engine management are you runnning?

just to be clear, we are talking about loosening and moving the distributor correct? I mean, changing IGNITION timing and not CAM timing right?

I don't know about these other geniuses, but I was referring to ignition timing.

What other timimng is there that applys here? Distributor adjustment is ignition timing. Although it can be changed through a fuel management system worth a darn.

Trey wrote:What other timimng is there that applys here? Distributor adjustment is ignition timing. Although it can be changed through a fuel management system worth a darn.

Well, the guy who posted was probably thinking cam timing, that's why I was clearifying above. As for the guy's fuel management system.. here's my guesses "stock ecu + vafc", or "jun ecu" or "brand-x ecu with vafc"

In other words, not a system worth a darn.

Even if the fuel management system sucks he can turn back timing (i.e. most people refer to timing as adjusting the distributor. If you are at 18 degrees go to 16 degrees). Cam timing itself could be changed but why would you thhi changing cam timing (adjustable cam gears even, we would have said adjust the cam gears).

Trey wrote:Even if the fuel management system sucks he can turn back timing (i.e. most people refer to timing as adjusting the distributor. If you are at 18 degrees go to 16 degrees). Cam timing itself could be changed but why would you thhi changing cam timing (adjustable cam gears even, we would have said adjust the cam gears).

Oh, I agree it can be set back :thumbup: (ignition timing that is) Someone else confused ignition timing with "timing belt timing" today too in another thread hehe