first of all, thanks to mellon for a great tune, ...however tunes do get pricey when you add more and more mods, so i want to kinda do my own.

did a few pulls yesterday, than on the last one i was hittin like 11 counts knock but i figured that was because my gas was on low, so i may have been sucking up fumes...

anywho, my question is, should the timing constantly increase, meaning right now, it will go from 4 to 3 to 4 to 5 to 6 to 5..

should it be smoothely like 3 4 5 6 7....

 

If you were on fumes, your car wouldn't be running at all. Only way a really low fuel level would have an effect would be if you were pulling high corner G's.

 

should be smooth 3 to 4 to 5..not neccessarily in those increments!

 

...i was being sarcastic bro

 

timing is relative to load so when you're cruising it's very high but as you get into boost the timing tapers down sharply towards peak loads...as the load drops off the timing comes up.

that's why you're seeing the value go down first then back up...that's normal

 

Hey MELLON

Yea it drops to 2... Than climbs to 15.....but throughout the climb it will drop a number than go back up

However looks like that was related to knock

On a final run it went from 2 to 15
Straight threw no knock

 

gotcha, well as a rule of thumb, set the boost where you want it, make sure the fuel is right then shave off any excess timing that may be causing knock.

 

Ideally you want your timing to all be steps forward after that initial drop.
I don't mean every entry in your log should be an increment in timing, it can also be unchanged, just no steps back.

But that being said, it's pretty common to see what you have. If you can tune your car to have a pretty constant load then it'll get easier to get rid of backward steps in timing.

 

+1

Generally, you want timing to increase with revs at WOT. Some cars will run in to odd knock issues if they are especially sensitive and you may need to pull timing at a certain RPM to combat that. Other than that rare instance it should be a smooth upward climb.

 

cool, thanks guys

 

if you increasing boost above stock, good rule of thumb is retard timing 1* for every 2psi increase

 

yea, i didn't stray to far...just tryin to smoothe things out after takin out the leaky bov...