Anyone have an idea where I can purchase a set of the HKS super iridium spark plugs? I am looking to buy a pair of the 525RE and 55RE. I tried looking on their website but it appears that they no longer take online orders. Any help would be appreciated.

 

I get them at advance auto.

 

The 525RE (10.5'S) are not in stock in the US, there are some of the 55RE (11's)

I prefer to use the Denso Iridium Racing plugs which are less expensive and easier to get Spark Plugs 93+ RX-7

 

I should be able to get them.

 

Those are rx8 plugs btw

 

Both plugs are all rotary application not just RX8. The M45REL is rx8 leading only

525 & 55 are;

[Mazda Rx-8(2004-2007), Mazda Rx-7(1979-1991, 1993-1995)] HKS Iridium Spark Plugs M-Series Super Fire Racing Spark Plugs

 

Are the HKS plugs essentially private label plugs from NGK or some other brand? Are they any different than the plugs sold at rx7.com at the following link?

Rotary Performance | FD Ignition

 

I suspect that the HKS are rebranded Denso since they are fine wire Iridium.

We have both NGK and Denso, we sell the both for less then the link you provided. Spark Plugs 93+ RX-7

We do not bother to list the HKS because they are more expensive and very long lead time if not in stock.

 

This may be a newbie question (shame on me) but here goes:

I had my car dyno tuned using the HKS M55RE and M525RE, if I switch to a different spark plug would I need to get my car re-tuned if I use plugs in the same heat range or colder?

 

Should be fine within the same heat range.

 

Is there any specific reason you want the hks plugs

 

Because I have been using those same plugs for 10+ years and am **** about the little details with my car...

I just ordered a set from Omar with Dragon Motorsports. With that said, I am going to have to consider getting different plugs in the future if these become discontinued or no longer available for sale...

 

Hope he has them sitting on the shelf, otherwise you are in for a long wait, since the only stocking warehouse in the US does not have any of the 525RE's.

 

HKS plugs are a waste of money. Just go with some motorcycle plugs.

 

We sold tons of the HKS plugs for R35 GTR's at Boost Logic but all of them honestly are rebranded NGK plugs. They were literally indented "NGK" on them in small type. Im sure HKS outsources all their plugs to be manufactured by NGK. Just get some NGK's and save $$.

 

Figured I would update this thread with pertinent information, since the HKS rotary engine plugs are actually Denso.

 

Yep they are just rebadged.
If anyone needs them I can still get the NGK 10.5 race plugs.

 

Anyone can get NGK 10.5's, we always have them on the shelf.

 

Yea they were hard to find for some time but it seems they are coming back.

 

What arrangement is the nose of the plug? Any photos of the electrode? IE are they surface discharge or semi surface discharge?

 

Guys... been running NGK 9s in all 4 positions forever with no issues. At what point (powerlevelwise) do you need to consider a 10.5 plug? 500+?

To OP, sorry for the sidetrack question.

 

The NGK, Denso and HKS race plugs can all be gapped for optimal performance.



It is not really a power level that determines the plug, it is the level of modification and RPM the engine is running at. Running a plug that is too hot used in a highly modified engine that is driven hard consistently will simply retain too much of the extra combustion temperature and burn itself up ,usually cracking the porcelain, and potentially doing major engine damage.

For example, we run NGK 10.5's in N/A ITS race cars that are only 200whp, but consistently see 9500rpm.

 

In an fd, I don't like to run more than 18 lbs boost on the 9's. I find cars that run a lot of boost with too hot of a plug tend to develop cracking around the spark plugs in the rotor housings.

 

I run HKS plugs with a 10.5 and 11 heat range. Can you get the same heat range with Denso plugs? If so, what is your pricing on them?

 

See post #3 & #8

We have both NGK and Denso Spark Plugs 93+ RX-7