I was wondering if we change the heat ranges colder for FI cars would it do anything to make the spark plugs hotter for N/A cars. Just a thought

 

huh>?

 

Nope. Maybe generate some preignition under hard running.

 

Wouldnt that create detonation?

 

idk what would happen. FI rx8 put colder spark plugs in so they dont get detonation. i was wondering what would happen if i put hoter plugs in instead of the trailing plug being so cold make it hotter. this may make the car run a little leaner and make a couple horses just an idea have not tryed looking for answers from someone smarter then me which there are plenty of them

 

^ I dont know if you want to make the car run any leaner than it already is. I wouldnt mess with different plugs but thats just me.
I think there are better and safer alternatives to pick up a couple more horses you speak of.

 

i always thought with factory tune our cars ran alittle rich

 

thats what i wanted to know i was wonderind if a hotter plug would burn more fuel

 

opps I meant richer not leaner.

 

so then what do they do for FI cars. b/c i have no idea

 

they use colder plugs

 

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The only reason for hotter plug would be if your plugs are fouling after low miles. Even then, the reason for fouling needs to be understood first and resolved if possible. In some cases, hotter plug could be the answer -- cold environment, short trips, gentle driver. As mentioned, hotter plugs were used for awhile early in the car's run when they were running extremely rich. Nowadays I doubt if very many RX-8 would benefit from hotter plugs.

Hotter plugs increase the risk of detonation.

Conversely, colder plugs decrease the risk of detonation, and that's why you are seeing them used in FI application.

In normal service, colder plugs will foul too quickly.

So, there is a balance between detonation on one hand and fouling on the other. The standard heat range is the best compromise for most drivers.

 

RE6s are what my Rx8 come with, but I've just put NGK BUR7EQ s(rx7 plugs) in to the leading, haven't had them in long, so don't know about flooding...Yet.

 

Detonation is caused by an instantaneous ignition of the remaining fuel/air mixture ahead of the advancing flame-front in the form of an explosion rather than controlled combustion. This is due to the unburned mixture being heated and pressurized by the advancing flame front to the point where it spontaneously ignites.

Pre-ignition is a different phenomenon to detonation and occurs when the fuel/air mix ignites BEFORE the spark plug fires due to hot spots in the combustion chamber acting as an ignition source.