-
About how much timing change should I expect to make between the winter and summer months?
1/2 a degree? 2 degrees? Seeing as how the winter air is gonna be colder/denser etc I don't want to get a good tune going now only to discover that I'm killing my motor in November w/o knowing it.
Ordered but not yet installed:
JRSC 6psi
JR Spec fuel pump
JR BTC
Going into a bone stock '95 GSR
Typical summer day: 80's moderate to high humidity
Typical winter day: 30's low humidity
Typical months I would *not* be using power 'cos there *might* be snow: Jan and Feb only
-
Since you'll have less detonation as it gets colder it seems like the safest thing would be to tune it for hot weather and then you're safe year round. Of course I guess you could be a little more aggressive in the winter months but it doesn't sound like you want to push it. Someone correct me if I'm wrong.
-
You probably could advance the timing a little more in winter because of the cooler air having less detonation risk.
However, at the same time, the temperature sensor trick that the JRSC does (you know, the relay that clicks at 1psi boost) becomes less effective the colder it gets.
When the outside temperature is 80F and the relay opens, the ECU sees something like -14F and adds fuel to compensate for the supposedly denser air. If the temperature is already at 30F, this trick doesn't result in as much additional fuel. Theoretically, it wouldn't do a thing at -14F.
I drove my JRSC GSR sub-zero (F) weather a lot last winter and never had a problem. I think the coldest I saw was -8F. This was at 8 degrees timing and 94 octane gas.
Of course, driving on 195-60-14 Blizzak's on frozen pavement leaves so little traction that I didn't push it very often.
Greg
