Best sparkplug 540 with supercharger?

[Dr. Frank]

Engine is an M60 with a Dinan supercharger. Thanks in advance!

[TC535i]

Engine is an M60 with a Dinan supercharger. Thanks in advance!

I'd go with a standard copper core, but go one temperature range colder. I had to get Iridium plugs for my 318 when I went s/c because they didn't sell a copper one any colder (in my fitment, I was at the coldest end of the range already with the stock plug).

[emw525E34]

Get the coldest one that fits, if you are running more than 7 PSI boost. Exotic plugs may not be better. I find NGKs pretty good.

[TC535i]

Get the coldest one that fits, if you are running more than 7 PSI boost. Exotic plugs may not be better. I find NGKs pretty good.

They say one stage cooler for basic s/c, one for nitrous, and two for turbo. If you're running more than 7-8 psi on the s/c I'd go two stages... for a standard s/c application, one stage is cold enough, any colder and you're gonna start fouling them if you don't drive full throttle constantly.

[BillionPa]

Denso IK27

[thxalot]

Hi Folks,

I also have a Dinan stage 3 setup on my M60, M-Sport. The previous owner also put in the Dinan performance cams and a custom ram-air intake to go with the S/C setup. Sucker is very tractable below about 3000 RPM and screams to redline from 4000 RPM on, but the idle is very lumpy.

I don't drive it like a mad man, but I definitely wind it out at least once every couple days. I'd really like to cure the lumpy idle (despite the hot cams in there), and have been thinking about putting in some Iridium plugs. I have had great success with them in my other cars (Toyota 2zz motor and a ZR-1), and the science behind the 0.4mm tip is very sound thermodynamics.

I was thinking of going with the IK24 plugs (2 ranges colder), but reading this thread has me thinking about dropping down to IK22 for a smoother idle.

Dr. Frank, what did you end up going with? How does it work for you? Do you also have a lumpy idle?

Lastly, does anyone make a nice set of pre-cut spark plug wires for this car that are very high-temperature resistant?

Thanks for any info, advice, or wisdom.

-Burt

[BillionPa]

no intercooler?

[dbals]

no intercooler?

No where to put it unless you delete air conditioning or do a funky front bumper. However, a water injection kit might give you a little extra.

[Jon K]

They make an air to water aftercooler for the dinan setups I thought. It's just a simple vortech blower - I am sure you could do a small air to water unit.

I run 2 steps colder in my turbo 5.

[thxalot]

Hi Guys,

I haven't seen a Dinan intercooler available, and I've even spent some time on the phone with one of their technical guys.

Jon, did you see this air to water unit from a 3rd party manufacturer or was it something custom? I'm not averse to either solution, since it's always a good idea to cool the intake charge.

Right now it's completely original Dinan stage III, except for the ram air holes routed out up front.


So without the intercooler, should I go with the IK24?

Thanks again,

-Burt