Is there a ball park of how much fuel to add for colder temps?

["Turbo-T"]

Since it's getting cooler out, and the air will be more dense, I was wondering if there's any type of a ball park to adjust the fuel settings to?

For example, I've been getting some mild knock on the Scanmaster and the wideband would show in the 11's at WOT. So I bumped up the fuel setting from the default 128 to 132. I don't get as much KR/the wideband now shows in the 10.3's. That was today in 75 degree weather.

But wasn't sure if for say a certain temp drop, if I'd need to add XX more fuel....how do you return your car for cooler weather?

Thanks in advance.

 

[TurboDave]

I find it amazing that you have to run so incredibly rich just to supress knock!! Is you gas octane around there that bad?

I haven't had to change my fueling at all in this cold weather, still keeping it at around 11.4. Car just runs WAY better in the chill.

 

[pacecarta]

with alky inj yeah you need richer than 11s


why not just turn the alky gian knob up a little or would that be too hard ???????

 

[bison]

1% of every 10* of inlet air temp change. I have never seen a car make decent power at 10.3:1.

 

["Turbo-T"]

I find it amazing that you have to run so incredibly rich just to supress knock!! Is you gas octane around there that bad?

I haven't had to change my fueling at all in this cold weather, still keeping it at around 11.4. Car just runs WAY better in the chill.

I have 93 in it...the chip was burned for 92. When it was warmer there was never any knock.

with alky inj yeah you need richer than 11s


why not just turn the alky gian knob up a little or would that be too hard ???????

I suppose I could try that. Just head for colder temps to richen up fuel, not alky.

1% of every 10* of inlet air temp change. I have never seen a car make decent power at 10.3:1.

So should I back off fuel then? If so how much? What should I be looking for on the wideband?

 

[TurboMonte 2]

You're NOT adding significantly more alky for fuel value--but to reduce KR...
Just put the chip-fueling back where it was...

 

[bison]

I have 93 in it...the chip was burned for 92. When it was warmer there was never any knock.



I suppose I could try that. Just head for colder temps to richen up fuel, not alky.



So should I back off fuel then? If so how much? What should I be looking for on the wideband?

If you are using one 15gph nozzle id shoot for 10.8:1 on 93 octane. id go a little leaner with non oxygenated high octane fuel

 

[Rich Gio]

I had to increase fuel by 3% due to temp change, but...I don't have alky (Yet).

 

["Turbo-T"]

You're NOT adding significantly more alky for fuel value--but to reduce KR...
Just put the chip-fueling back where it was...

Thanks. I put it back. I understand about the alky as the knock quencher, just thought when they said to "re-tune for colder weather" meant to add a little more fuel.

If you are using one 15gph nozzle id shoot for 10.8:1 on 93 octane. id go a little leaner with non oxygenated high octane fuel

Thanks.