leonine said that he had the same problem with using colder plugs in his car due to the engine running on the rich side.... He was very adamant about using stock heat range plugs..... I have stock heat range plugs in my car and notice that at times when driving at low RPM in traffic I will feel some hesitation unless I pull a few more revs during acceleration to clean the plugs.... I can tell a difference in the exhaust odor since installing the KWSC and mentioned it and was told that the A/F ratio was he same as the stock ratio by Oscar Jr..... Oscar Sr. recommends the IK22 Denso plug for performance driving style so I guess hat you have to be very light on the accelerator pedal at low RPM and stay in the lower gears until you are over 3000 RPM to not load up the plugs..... The taller gearing of the A/T cars would seem to compound this problem.

 

I've put something like 20 000km on my set of IK22 and never got any problems with them... granted i'm almost stock too... :P

Marko!!

 

i just got the ik22's today and theres deffently more power. not alot but its there lol. shud i run premium gas or stay with regular??

 

The engine retains less heat with the colder plugs and that results in lower exhaust temperatures much like using premium fuel does.... Doing both would result in the ECU increasing the ignition advance and a leaner fuel mixture which is what you want it to do to improve efficiency... Efficiency is the best way to go for power and fuel mileage..... There is a lot of controversy in regards to using premium fuel in the Fit, so if you don't feel like your car is benefiting from using it enough to justify the cost, just don't do it.... Everyone I personally know that drive late model Honda's tell me their cars run significantly better with the good stuff.....

 

okay thanks for the reply, i went and got 91 octane tonite so ill see how it is tomarrow on the drive to school. thanks!!!

 

on my stock fit i find that the 91 runs out quicker than 87.


EDIT... that came out kind weird... I find 87 gets better mileage than 91 on my car.

 

after reading a few threads on changing the spark plugs to the denso ik22's, i gave it a try as my 40,000km service recommended a change of spark plugs. i drive a 1.5 litre A/T and i can definitely say there is some difference when driving now, the most noticeable thing for me was that the drive seemed quite a bit smoother, and there seemed an ever so slight increase in pull at the lower rpms... it could just be the transition from having old plugs to new ones, who knows XD

 

I just got a set of IK22, do I need to change the gap?
or should I just pop them in???

 

They are gapped as they come so get to wrenching... just pop them in.

 

Well, I've been driving a couple of weeks with these plugs, I can notice its a little more torque, and an increase in mpg, about 1.5mpg consistantly with every fill up!

Cold idle is a little rough, but goes away quickly, after about 3-4 blocks of driving...

 

are you NA or SC?

 

back to the top.

 

^why???? you bumped this even though you have no questions? lol

but regaurdless,
im running ik22 plugs in my turboed fit. used them with the gap they came with. decided a few months later to gap them to .027 and it runs much smoother.

 

After 4 months of driving with the KWSC high boost upgrade I have noticed that since the temperatures have been in the 80s the cold light stays on for a little less than 1/2 mile of just under 2000 RPM driving in 1st and 2nd gear.... Not a problem an any way.... Also at 40 to 55 MPH in 5th gear with just enough throttle to maintain that speed I am seeing up to 46 degrees of ignition advance on my scan gauge and considerably more advance when the throttle pedal is down and accelerating.... This has a positive influence on low end torque and also improves fuel mileage..... The engine requires a few more turns of the starter motor before it fires up the engine but I am writing that off as being due to the battery being over 4 years old and that my car sits for as long as 2 or more weeks with out being driven.... I am considering getting an HKS ignition amplifier and going to an even colder heat range set of spark plugs..... I have done the same with another vehicle and one heat range colder pinged terrible but 1 step colder in a copper core plug surprised me with better throttle response, better fuel mileage and power increase that was apparent to every ones butt dyno.... The one drawback was that the plugs needed to be replaced in no more than 20,000 miles at best, but at less than $3 each and 10 or 15 minutes max to replace was no big thing.

 

Just installed the denso IK20s and seems like my car is slower than before? The gas mileage has improved but it seems to crawl up hills now, did I do something wrong? I didn't bother with indexing but read that it's negligible in a small engine like ours.

 

The IK20 Denso spark plugs are the same heat range as the Fit is equipped with from the factory so the should run at least as good as it did with the old plugs.... The auto parts stores in this area don't carry the IK22s so I bought IK20s for my car about 3 years ago and could tell no difference between them and the OEM NGK spark plugs.

 

They seem to run a little smoother but it feels like i'm hauling 3 passengers, I may reinstall the NGKs this weekend and see if it improves, also I didn't use any dielectric grease in the coilpacks because i forgot to buy it but don't think that would make a difference...

 

what's the pros and cons if installing IK22 on stock everything?

 

the cylinder temps won't quite reach optimal thus hindering performance and mpg's, and on short drives you risk fouling the plugs...

 

does anyone know what the difference between the denso ik22 5310 and denso ik22 5304?