i need to what should the spark plug gap be for my iridium plugs :impatient ?.
my mods are.
15%pulley
unichip
alta peformace exhaust
msd coil
live wires
k&n typhon intake
today i dyno tested it "182.35max hp.. 158.49max torque

 

i believe its .065 for the gap.. but i could be a decimal off.. its been a while

 

Did you read the Forum? This is the NON COOPER S Performance thread. For those of us who do not need a super charger.

 

Ouch.

 

And with toys like this, it's never about need!

Back on topic, a couple places I talked to say run them at 065 out of the box, and some others have had good success with them at 045 like the stockers. The right way to set them is based on spark duration, but it takes some good equipement to do that.

Matt

 

Stock is .065 but because of the particular OEM plug construction it doesn’t quite equate to a standard gap configuration. If it is a reduction pulley MINI run hard (track, autoX, dyno) then .035 is a safe bet. For average operation then .045 is adequate (regardless of ignition changes). I used .035 for a long time because of numerous dyno runs and hard charging. Recently gapped to .040 and have gained an average .75 miles per gallon over three tanks fills, FWIW.

Here is a copy of very good reply by John Petrich on a similar subject (Denso vs NGK) which I have taken out of its original context. “The spark plug gap for the MINI and for any other engine is determined by the ignition systems capabilities as designed by the manufacturer of the car, not the manufacturer of the spark plugs. The ignition system includes the plug wires, coil pack, and coil driver electronics in the ECU. The "stock" gap for the MINI is the 0.065", as measured from the Bosch plugs that come in the engine. The gap of any spark plug, as delivered from the manufacturer, is just that. That gap isn't "stock" anything as far as an engine is concerned. Anyone who wants to run the "stock" gap should regap the new plugs to 0.065", the gap specified by BMW”.

“That said, many posters, myself included, are advocating the 0.035" spark plug gap in MINI's that are tracked, and those using after market pulleys; regardless of the coil pack, regardless of wire changes, regardless of coil driver modifications. The simple reason being that the pulleyed engine in a sustained high output engine environment, like the track or dyno, challanges the spark capabilites of the ignition system. We see this combustion chamber stress with engine missing and measurable reduction in engine HP on the dyno. It is now standard practice to run approximately 0.035" spark plug gap for tuned MINI's. This generally accepted gap of 0.035" conviently corresponds to the "as manufactured" gap of the new Iridium spark plugs. The resultant reduction in engine missing and in power output is not "gained" power but less "lost" power. A lot of people do run much larger spark plug gaps, say the stock 0.065" up to 0.085", and do just fine for street use. In fact, people attribute improved engine smoothness and mileage from these larger plug gaps. But, these large plug gaps don't stand up on the track or dyno”.

 

Moved to PM-Drivetrain.

 

thanks guys.
and sorry about posting in tha wrong place :impatient ...

 

don't be, some ppl can be overly mean when you do something as horrid as posting something in the wrong sub-forum.

Great numbers, you're pulling JCW210 figures there

 

If DrDiff was being overly mean, then you need thicker skin.

 

naw am not concerned with DR. "STIFF. HE"S ALRIGHT.