Weather & Timing

[BigDave06]

The temperatures are dropping around here and I was wondering if I should pull the predator out and change my timing? My custom tune has quite a bit of timing (9-10 Degrees advanced I believe) and I was just wondering how the weather affects the that?

 

[scupking]

The temperatures are dropping around here and I was wondering if I should pull the predator out and change my timing? My custom tune has quite a bit of timing (9-10 Degrees advanced I believe) and I was just wondering how the weather affects the that?

I'm actually wondering the same thing. My car pulls much harder now that it’s getting cool out. But I notice that once the engine warms up she will ping. I think I will drop my timing buy another 2% bring it to 4% below the custom tune I have. Are there any bad effects on lowering the timing? I heard that every 25HP increase you should lower the timing by 2%.

 

[BigDave06]

I think i may be hearing a pinging too, though im not sure having never been around cars.. This is my first one im really getting into. Its a hi-pitched light (non-violent) chirp, that goes in tandem with the revs (more - faster). It also sounds like a really quiet belt squeek, but i think not.

 

[propellerhead]

I've had aggressive timing on my tune. I had to pull it back a bit during the summer. I've added half of it back in now that it has cooled off a bit.

I'm actually wondering the same thing. My car pulls much harder now that it’s getting cool out. But I notice that once the engine warms up she will ping. I think I will drop my timing buy another 2% bring it to 4% below the custom tune I have. Are there any bad effects on lowering the timing? I heard that every 25HP increase you should lower the timing by 2%.

I thought that was the rule when installing a nitrous kit.

 

[Tim2002GT]

I might be wrong, but I've always thought you could add a little timing in cooler air.

 

[scupking]

I might be wrong, but I've always thought you could add a little timing in cooler air.

Yeah thats what I thought. I think something else is wrong and thats why I'm getting the pining. It seems to be getting worse.

To answer BigDave06 question. Pining sounds like marbles rolling around. The chirp your hearing could be your belt slipping.

 

[BigDave06]

Thanks

 

[the98stang]

Yes cooler air lets you pull a little more timing. You could probably pull 14^ safely while running 91-93 octane.

 

[ToplessStang]

Added 2% timing in both rev ranges with the Predator tonight on 93 octane. New best speed of 107 mph .

 

[scupking]

Its funny last night it didn't ping at all. I'm going to raise the timing up by 4%.

 

[Scorcher2005]

Sorry for being off subject, but it was brought up...The general rule for nitrous is every 50shot you pull 2* timing.


Also, im a little confused...So do you add or subtract timing when it gets colder out. I thought you would take some away. As it gets colder, the air gets denser meaning the engine gets more air. More air = leaner. On top of being leaner, why would you want to add more timing?

 

[propellerhead]

Sorry for being off subject, but it was brought up...The general rule for nitrous is every 50shot you pull 2* timing.


Also, im a little confused...So do you add or subtract timing when it gets colder out. I thought you would take some away. As it gets colder, the air gets denser meaning the engine gets more air. More air = leaner. On top of being leaner, why would you want to add more timing?

The theory is that when the engine gets hot, the EEC retards timing. Too hot cylinders are prone to pinging. Hence, when it is cold out, the engine is not so hot and you can afford to have more advance.

 

[the98stang]

Sorry for being off subject, but it was brought up...The general rule for nitrous is every 50shot you pull 2* timing.


Also, im a little confused...So do you add or subtract timing when it gets colder out. I thought you would take some away. As it gets colder, the air gets denser meaning the engine gets more air. More air = leaner. On top of being leaner, why would you want to add more timing?

Colder IAT's allow you to advance the timing. That's why it's safer to run more timing on an intercooled engine vs non IC'ed if you have a blower.

 

[DaNd4Speed]

I'm a little confused here as well. When you guys say "pull" timing, are you adding or subtracting?

 

[Scorcher2005]

pull timing means to subtract it.

Yes cooler air lets you pull a little more timing. You could probably pull 14^ safely while running 91-93 octane.

I think he accidentally said "pull" instead of "put" or something...

 

[DBMSTNG]

you shouldn't have to pull any timing for cooler air. but you have to watch out for winter gas. in cold climate regions, gas stations use a different formula of gasoline in winter that is more succeptable to pinging.

 

[2002BLGT]

The temperatures are dropping around here and I was wondering if I should pull the predator out and change my timing? My custom tune has quite a bit of timing (9-10 Degrees advanced I believe) and I was just wondering how the weather affects the that?

9-10 degrees is not alot of timing

 

[BigDave06]

9-10 degrees is not alot of timing

Thanks, my tuner didn't explain much to me.. Thanks everybody

 

[Scorcher2005]

Isnt 10* pretty much stock timing advance? It may not be in the 4.6, but if i remember correctly thats what my fox came with.

 

[2002BLGT]

Thanks, my tuner didn't explain much to me.. Thanks everybody

anywhere from 16-25 degrees depending application etc. is what most cars and trucks run at WOT ........