Kia Forte Forum banner
1 - 18 of 18 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter · #1 ·
Has anyone out there upgraded their spark plugs to say Denso Sard, or any other plugs that are iridium/performance plugs (if there is any difference at all?) and larger MM/gauge wiring (8.5)?

If so, have you noticed anything different?

If not, is anyone likely to see any increases in performance?

Thanks
 

·
Registered
Joined
·
76 Posts
I checked with a local import shop and they said they didn't have anything for my car...too new....story of my life!
 

·
Registered
2021 Forte GT w/GT2, Currant Red, SXTH Element Intercooler Kit, Evilla Exhaust, Takeda S2 Intake
Joined
·
3,845 Posts
Has anyone out there upgraded their spark plugs to say Denso Sard, or any other plugs that are iridium/performance plugs (if there is any difference at all?) and larger MM/gauge wiring (8.5)?

If so, have you noticed anything different?

If not, is anyone likely to see any increases in performance?

Thanks
Coil on plug...no wires to upgrade.

Seriously, the engineers spent considerable amount of time and money to find a sparkplug that will give the best all-around performance...do you really think an aftermarket plug manufacturer will spend anywhere near the time and money to try and make a better plug? Obviously, if you intend to drive your car outside of normal operation, as in high RPM for long periods, finding a colder plug would help...but IMO you won't find a better plug that will provide better MPG and performance over what the engineers tested and came up with.
 

·
Registered
Joined
·
2 Posts
You will see very very very little if any noticeable difference with upgrades such as wires/plugs. I can try and find an old write-up on EvoM.net about these upgrades. It was looking at ignition upgrades, plugs, wires, COP ect and did a lot of comparisons. Keep in mind were talking about 400hp-1000hp cars here, a whole other class. The gains were fairly minimal, some made the cars more temperamental, others showed slightly better response at huge boost levels. No real impressive gains that I recall. i'll look for it later tonight.

Also I'll be making a write-up for the main 2.4 section, a good F.A.Q that will hopefully get some real information going around. This isn't one of them, but ya gotta get tired of the same ol intake, exhaust, warranty questions that are posted.
 

·
Registered
Joined
·
1,796 Posts
Plugs/Wires upgrade is an old school mod that doesn't work with our new cars since times have changed and the tech along with it.
 

·
Registered
Joined
·
973 Posts
this isn't a 90's honda, swapping out plug wires isn't going to do anything (esp since we are Coil on plug, as mentioned before, so no plug wires.) don't go with a colder heat range plug or you're just going o foul it. Run the heat range the car came with, and you will see an increase in spark plug lifespan if you upgrade to platinum tip or double platinum, I think these cars came with denso iridium stock, which is a very good material.
we should ask crock what they came with actually, I'm sure he looked at the plugs before he took the head off and all.
 

·
Registered
Joined
·
129 Posts
what do you guys think of the plasma coils? do you think that would be a better upgrade?
 

·
Premium Member
Joined
·
1,020 Posts
Anyone look in to side gapping and indexing the plugs?

I thought about trying Brisk's Halo plug but it's like $20 a piece I'll try it in 2 years when I need to change them.

I figure when it gets warmer I'll try indexing and side gapping my OE plugs.
 

·
Registered
2021 Forte GT w/GT2, Currant Red, SXTH Element Intercooler Kit, Evilla Exhaust, Takeda S2 Intake
Joined
·
3,845 Posts
Anyone look in to side gapping and indexing the plugs?

I thought about trying Brisk's Halo plug but it's like $20 a piece I'll try it in 2 years when I need to change them.

I figure when it gets warmer I'll try indexing and side gapping my OE plugs.
When I used to dragrace big-block cars back in the 80s I tryed indexing plugs -- bought 24 plugs at a time and marked them and would try different ones until I got them indexed to point to the center of the cylinder or down (depending on the engine I was using at the time). After all that work none of the cars went any faster -- I stopped indexing completely after that and won't waste my time trying it on these engines!

Seriously, stay with what the factory recommends unless you are going to run some kind of race where you'll be keeping the revs high for long periods.
 

·
Premium Member
Joined
·
1,020 Posts
When I used to dragrace big-block cars back in the 80s I tryed indexing plugs -- bought 24 plugs at a time and marked them and would try different ones until I got them indexed to point to the center of the cylinder or down (depending on the engine I was using at the time). After all that work none of the cars went any faster -- I stopped indexing completely after that and won't waste my time trying it on these engines!

Seriously, stay with what the factory recommends unless you are going to run some kind of race where you'll be keeping the revs high for long periods.
Well forget about getting noticeable power. Plugs/ignition will never get you a faster car by itself. In the best case it's more MPG. Most of the time ignition is a support mod(allow for more fuel, more boost, more timing advance, etc...). Not that'd you notice in drag racing but did you get better MPG?

Fine tuning the plugs in my old 98 Grand AM netted a slight very slight MPG gain. We're talking playing gapping, indexing though I didn't try side gapping(didn't want to change the plug more often). If you've ever had to change plugs on a 3x00 GM engine on a FWD it's a pain. But all it took was time. I got ~1MPG gain. It also seemed more responsive. Taking an extra hour to change my plugs to get 3/4 of MPG over 2 years is worth it if you got nothing else going on, on a Saturday.

I just used indexing washers to index instead of getting like 18 plugs.

I was sitting around thinking that maybe, playing with side gapping, indexing and the gap would help the Theta II engine. The reasoning is we run a fairly high compression. This relatively high compression means that the stock ignition has be to higher energy(coil on plug already helps this) so a slightly larger gap eg 0.044 could yield something.
 

·
Premium Member
Joined
·
1,820 Posts

·
Premium Member
Joined
·
1,820 Posts
 

·
Premium Member
Joined
·
1,020 Posts

Those plugs apparently also work. I just haven't found a cheap enough source.

Every place online wants like $20 for them.
 

·
Registered
Joined
·
825 Posts
I agree it sounds like someone has recently converted from the Honda Forum (me included). . .Once you've driven a car for 15 years it takes a while to used to new technology. . . .No need for those Blue Spark Plug Wires:rolleyes:



this isn't a 90's honda, swapping out plug wires isn't going to do anything (esp since we are Coil on plug, as mentioned before, so no plug wires.) don't go with a colder heat range plug or you're just going o foul it. Run the heat range the car came with, and you will see an increase in spark plug lifespan if you upgrade to platinum tip or double platinum, I think these cars came with denso iridium stock, which is a very good material.
we should ask crock what they came with actually, I'm sure he looked at the plugs before he took the head off and all.
 
1 - 18 of 18 Posts
Top