As stated in the title of the thread, I am wondering what type of spark plugs would work best for my supercharged lexus. I bought some Denso Platinum TT plugs (PK20TT) from Advanced Auto Parts, but am looking to see if something is better for my vortech supercharged setup. I'm not a fan of iridium based spark plugs, as I've had bad experiences in the past with horrible gas mileage. Thanks ahead of time!

Welcome to CL... check out the GS performance section.. Many members have had SC GS's.. Try the search also.. Sorry don't have any links at the moment

I used NGK BKR7-EIX

I'm currently using the same plugs on my SC'd GS300 also and it's great. Just make sure the gap is around .031.

I use the same^

IIRC i'm using TR8ix


I thought Iridium plugs could not be gapped because of how delicate the tips were? I suppose they can... if you're brave enough

you can't gap iridiums.

use the same as well.. "colder plugs"

what supercharger kit do you have?

I have a Vortech supercharger on my gs400... I'm glad to be part of club lexus, lots of great info on this forum and thanks for the replies! what do you guys think about Denso Double Platinum plugs compared to the NGK BKR7-EIX?

Heres Densos "guide" do doing so

http://densoiridium.com/installationguide.php

I personally wouldnt do it

yea...I've tried that before and learned the hardway. Its not too easy...

Technically you shouldn't need to gap the plugs but it's doable. I would however not use one of those round spark plug gap gauge to check the gap as it's not very accurate and will rub against the electrode. I use a feeler gauge to verify the gap.

i've replaced my plugs with the ones you suggested. the car feels a lot more smooth.

...old thread. Did you by any chance buy this car recently? Does it have SSR wheels? If so, I think I know the car...I have seen it once before for sale on long island. In any event...Welcome to ClubLexus!

Is there an NGK BKR7 for GS400? I looked up the NGK site and found the BKR6. Will that wrk the same?