What are the best spark plugs for a Vortech sc S2k
01-22-2003, 01:10 PM
#21
My understanding is that the copper plugs offer more spark energy than the platinum plugs, but don't last as long. The iridium plugs are supposed to be the best of both (good spark AND long life).
I am surprised that you guys would only go 1 step colder than stock for FI. I am using the Denso Iridium IK24, which is 1 step colder, on my near-stock setup. I think the colder plugs help prevent the ECU from pulling out timing from detonation. When I compare my timing curve (via ODB-II) to another '02 owner's timing curve, my timing is about 10% more advanced.
I am surprised that you guys would only go 1 step colder than stock for FI. I am using the Denso Iridium IK24, which is 1 step colder, on my near-stock setup. I think the colder plugs help prevent the ECU from pulling out timing from detonation. When I compare my timing curve (via ODB-II) to another '02 owner's timing curve, my timing is about 10% more advanced.
01-22-2003, 02:58 PM
#22
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The Vortech manual says to start at 2 ranges colder and test the plugs in a few hundred miles and if they are fouling, move up a heat range. What Denso Irridium part# is two steps colder than stock and what is the proper gap for S/C engine??? Phil
01-22-2003, 08:26 PM
#23
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Here is an excerpt from my Vortech owner's manual. This is for street applications only:
3. Spark plug/ignition system guidelines. Always utilize
the stock specified heat range for street legal
applications. For off-road use only, use one range
colder than originally specified and reduce the gap
to .032" - .040". If your vehicle is equipped with an
ignition amplifier such as a Crane HI-6R or MSD 6A,
reducing the spark plug gap is not necessary. Never
utilize platinum plugs on a vehicle not originally
equipped with platinum plugs from the factory.
Every 15,000 miles, check to ensure spark plug wires
are within factory specified resistance. Replace
whenever beyond specification or every 50,000 miles,
whichever comes first. This may be contrary to
factory recommended intervals, but is consistent with
the use of the Vortech supercharger system on most
vehicles. Vortech also offers high performance
ignition wire sets for certain applications. If equipped,
inspect the condition of the distributor cap and rotor
every 15,000 miles.
the stock specified heat range for street legal
applications. For off-road use only, use one range
colder than originally specified and reduce the gap
to .032" - .040". If your vehicle is equipped with an
ignition amplifier such as a Crane HI-6R or MSD 6A,
reducing the spark plug gap is not necessary. Never
utilize platinum plugs on a vehicle not originally
equipped with platinum plugs from the factory.
Every 15,000 miles, check to ensure spark plug wires
are within factory specified resistance. Replace
whenever beyond specification or every 50,000 miles,
whichever comes first. This may be contrary to
factory recommended intervals, but is consistent with
the use of the Vortech supercharger system on most
vehicles. Vortech also offers high performance
ignition wire sets for certain applications. If equipped,
inspect the condition of the distributor cap and rotor
every 15,000 miles.
01-23-2003, 05:52 AM
#24
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[QUOTE]Originally posted by xviper
[B]
The Vortech manual states that you can use platinum plugs if that is what comes stock on the car, however, you must still re-gap them.
[B]
The Vortech manual states that you can use platinum plugs if that is what comes stock on the car, however, you must still re-gap them.
01-23-2003, 05:53 AM
#26
Originally posted by VTECPHIL#6829
The Vortech manual says to start at 2 ranges colder and test the plugs in a few hundred miles and if they are fouling, move up a heat range. What Denso Irridium part# is two steps colder than stock and what is the proper gap for S/C engine??? Phil
The Vortech manual says to start at 2 ranges colder and test the plugs in a few hundred miles and if they are fouling, move up a heat range. What Denso Irridium part# is two steps colder than stock and what is the proper gap for S/C engine??? Phil
IK22 = OEM heat range
IK24 = 1 step colder
IK27 = 2 steps colder
01-23-2003, 06:12 AM
#27
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I am running IK27's, and I don't recommend them for a typicaly user.. I boost up to 20psi with them, but if I were running a supercharger I would run the IK24's. I plan on changing to the IK24's soon.
The IK27's are very very easy to foul if you aren't careful, and cold start up throttle response can suffer. The trade off is the car is more safe in boost however.... Once the car is warmed up they run great!
Denso has a new plug called Denso Racing, which is half platinum and half iridium. They retail for $40 a plug. They ran great for a couple days, and then I decided to play with my tune and ruined them. I bought some carb cleaner to try and resurrect them...
What have you guys been doing to clean the Denso iridium plugs?
Chris
The IK27's are very very easy to foul if you aren't careful, and cold start up throttle response can suffer. The trade off is the car is more safe in boost however.... Once the car is warmed up they run great!
Denso has a new plug called Denso Racing, which is half platinum and half iridium. They retail for $40 a plug. They ran great for a couple days, and then I decided to play with my tune and ruined them. I bought some carb cleaner to try and resurrect them...
What have you guys been doing to clean the Denso iridium plugs?
Chris
01-23-2003, 06:35 AM
#28
[QUOTE]Originally posted by cjb80
[B]I am running IK27's, and I don't recommend them for a typicaly user.. I boost up to 20psi with them, but if I were running a supercharger I would run the IK24's.
[B]I am running IK27's, and I don't recommend them for a typicaly user.. I boost up to 20psi with them, but if I were running a supercharger I would run the IK24's.
01-23-2003, 06:47 AM
#30
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It was a software issue with the EMS, not a problem with the plugs. I am running the IK27's now daily, but plan to run IK24's when they get in stock.
Chris
Chris