Using colder plugs GREAT IDEA

[claymore]

Some of you may have noticed on "that other site" a contributor finally posted a thread on using colder plug in either N/A stock Fits or FI ones. Glad they could finally catch up as I posted that advice over three years ago in the spark plug post on that site.

But anyway whoever you want to put your faith in it is GREAT ADVICE. Using colder plugs in ANY Fit/Jazz is the easiest cheapest mod out there with proven gains.

Simply look at your stock plugs and there will be a "6" in the plug number. Go to your parts place and just order a set of the brand you want BUT replace the "6" with a "7" like the ones I use end up being NGK number BKR7E-11 take your new colder plugs and install them and your done.

The only thing we disagree on just a bit is why there is a power increase. He seems to thing it's from pulling the tip back further from the combustion chamber increases the flow (and would also effectively lower the CR a minute amount with attendant lost of power)... I think it's more from the extra advance that the ECU puts in due to less tendency toward detonation because of the colder tip temp using colder rated plugs.

But anyway which ever reason it is you get proven gains for CHEAP and easy.

[macbuddy]

Hey John,
Just to let you know, I do remember reading your post on the use of colder plugs at "that other site," and yes, that was quite a while ago.

The only thing we disagree on just a bit is why there is a power increase. He seems to thing it's from pulling the tip back further from the combustion chamber increases the flow (and would also effectively lower the CR a minute amount with attendant lost of power)... I think it's more from the extra advance that the ECU puts in due to less tendency toward detonation because of the colder tip temp using colder rated plugs.
Could one also say that the lower CR also allows the ECU to offer extra advance before detonation?

Three years ago, you offered advice that demonstrated an obvious "real world" performance gain. However, your spark plug advice was not fully "approved."
Isn't it funny how posted mods like yours are not considered "acceptable" practice, until such mods are endorsed by renown tuners that are required to use very expensive high tech equipment to prove their claims?

It took 3 years, and over $20,000 worth of high tech equipment to confirm that your "butt dyno" works!:)

[claymore]

Hey Mike thanks for the kind words. Yep it's funny about who posts stuff and nobody believes it then another person posts the same thing and it's like wow this is a big deal. It's real funny how some of the "Web experts" said it was a waste of time and wouldn't result in any performance gains and now those same "experts" are now falling all over themselves smooching butt Ha.

For sure the minutely lower CR would effect the point at which detonation occurs but it might be too small of a difference to notice on the advance. But that being said it would fall toward more advance side anyway so at least it can't hurt.

Now you guys might be more sure about indexing also, watch out for "His" posting about indexing sure to come.

[claymore]

Had a PM from a member who asked if he would have to change plugs more often if he switched to colder plugs. My advice to him was if you drive like you stole it and didn't put put around town like a grandma you should have no problems using one step colder plugs. BUT if you drive slowly and never get on any expressways and "blow the carbon" out every once in a while it's possible that they might foul sooner than normal.

They don't wear out faster but it's possible they could foul if you drive like a turtle... but if somebody is looking for more performance by looking at changing plug it a good bet they don't drive like a turtle:p

[VillageIdiot]

There has also been many that don't believe that the ECU is sophisticated enough to increase the timing when using higher octane fuel..... When It has been proven to them by others and themselves even, they have asked, what makes you think that advancing the timing increases the horsepower or improves gas mileage..... I have always used the coldest heat range plugs that I can get by with and only had the set I had put in a BMW K100RT foul on me and that was in weather in the upper 20s..... I have a Mallory ignition booster on a 97 GMC Safari van and have to use 2 heat ranges lower than stock in NGK V Power plugs.... It also has HyperTech programming...... What do you think of using NGK V Power spark plugs in the Fit?.... I realize they don't last as long but they seem to work well in other vehicles and are resistor type plugs.

[claymore]

They should be OK.