Hiya

So as the title says, what do you think? Will the difference in plug throw off this engine as its very precisely designed around the twin spark or should i just stick with the nkg iridium's recommended? I know a lot of ppl do these plugs for VTEC but single plug so not as much of an issue.

 

I don't think any one has tried or tested this on the IDSI....

The IK-22 is a "cooler" spark plug, which allows the car to advance timing further and idealy make more power. This has been tried and true (like 2-3whp) on the 1.5 VTEC when combined with a higher grade (91-93 octane) fuel.

The IDSI though is designed to run MUCH leaner than the 1.5 VTEC engine and I have NO CLUE what a cooler plug would do for you...

Outside of runnin back to back dyno pulls before and after install, there is no way to confirm what they will do for you.

You can always get a wide band AFR gauge (like Digital Wideband Air/Fuel Gauge - Wideband O2 UEGO, Water/Methanol, Stand Alone Engine Management, Piggyback F/IC, Tru Boost Controller, Gauges, Automotive Performance Electronics)
And start brushing up on EFI tuning... That might be cheaper.

 

What you should do is use the stock plug number and then go to a conversion chart to go one step colder before blindly using these.

With your posts indicating your driving style is faster than the normal driver I would think one step colder would be fine.

If you can't convert the numbers just post the recommended stock plug for your car and we can convert it for you.

 

Stock is either:

NGK iridium BKR6EIX-11
Denso iridium IK20

 

That means both use larger numbers for colder heat ranges.

The results

NGK BKR7EIX-11

Or Denso iridium IK22

Those are one step colder.

see chart DENSO SPARK PLUGS

 

Hey man thanks! That does make perfect sense, ill give them a try and see if there's any difference!

 

If there is anyway for you to run a before (baseline) and after dyno that would be awesome! And much more accurate than the "butt dyno"