Just swapped out plugs for the ngk iradium bkr7eix-11 which are the same plug as the denso ik22 iraduim. Defentely more torgue and power down low. Also alot smoother. Also ngk are easyier to get locally at part stores.

 

What's the model number of the stock spark plugs that come with the GE? Is the stock spark plug, NGK or ND? I thought the stock spark plug is iradium.

 

The stock plug is NGK.... He went one heat grade colder which dissipates more heat from the combustion chamber and allows the ECU to add ignition timing advance resulting in noticeable power at lower rpms.

 

What is the stock NGK part number?

 

OE Laser IridiumIZFR6K13 ^ # is the stock plugs.

 

Seriously? Noticeable power increase from a 115hp 1.5L? Certainly not something your butt dyno could feel.

 

Colder heat range plugs have made power increases that have been measured on a dyno at Kraft Werks on naturally aspirated and forced induction Fit engines..... It my butt dyno can't detect a change in performance I don't consider it worth the time or money regardless of what a dyno says.

 

Colder plugs will not get you more power from a tiny NA 4pot, if you're boosted they'll allow you to add more boost and prevent knock and decrease egt. On the other hand, in colder temps your car could have a harder time starting, rough idle, and carbon deposits don't burn off as well. All things my boosted v6 experienced. The dyno "increase" due to these can't be more than the margin of error from run to run.

 

i guess tell oscar jackson. he is full of shit. my car is running great with these plugs.

 

So it was running terrible with the stock plugs?

 

no of course not? cheap to to change them out.

 

Are there dynos, with multiple runs, that show power gains between brand new stock temp plugs and brand new colder plugs?

 

they did dyno runs on the honda tuning mag honda fit project car. oscar jackson found a hot spot in the cylinder with the stock plugs. so changed the plugs to denso ik22 which are one stup colder and also a little shorter in length. the car pulled i think 5hp more to the wheels and 4flb of torque. more than some intakes and exhaust on these cars.

 

So, how difficult is it to change sparkplugs on Fit? Is it as easy as K20? I'm ordering IK22 soon...

 

I am one of the old guys on this forum that grew up changing jets, making minute adjustments to carburetor floats, timing adjustments and using colder plugs to get more performance...... The knock sensor, O2 sensor and ECU on todays cars do a great job of taking care of mixture and timing adjustments that allow for performance increases with colder plugs and higher octane fuel, as well as adjusting for improvements in intake and exhaust flow...... Welcome to the 1980s.

 

I think it is pretty difficult. It is all the way at the back. There must be bunch of stuff needs to be taken off before getting to the plugs. It will be interesting to see how the OP did it. A DIY howto will be great.

 

I got the same results when I swapped coppers with 22k miles to brand new coppers, brand new plats, and brand new iridiums as well. Of course this was on a v6 with double the power but all new plugs were within 2hp of each other and 6-8hp higher than the old plugs.

Some say you need to remove the cowl under the wipers while others said they had enough room to stick their tools down there without removing anything.

 

Yes it is possible! On an even smaller 1000CC Yamaha 4 cyl snowmobile 150 HP motor, a plug swap netted 4 HP. This was documented by over a dozen guys on a dyno. And radar runs also showed a jump in top speed from about 126 MPH to 129 on average.

A point may be missed here, the Fit plug swap idk22 is a shorter plug. It does not protrude into the combustion chamber nearly as much. So I think better flow is part of the increase.

 

this all good info. but to each his own. i know plugs are cheap
and all. but why change something that isn't broke. oem plugs
suppose to be good for 100k. not that i'm going 100k. i'll go 40k
maybe. but to change plugs early is a waste of money and time.
just my .02 cents

 

I was looking at the NGK site and this spark plug isn't listed for the GE8 and also on other sites I just want to make sure it's the right one

bkr7eix-11 Stock number 6988 IRIDIUM IX SPARK PLUG

right????