What did you gap your colder spark plugs to?

[purekoryo]

I'll be purchasing a 2 step colder spark plugs (NGK-R7437-9); what did you gap them to? I'm at stage 2 making 500+hp. Is this too cold for E85, since they burn cooler?

And for the sake of starting another thread: What spark plugs are you running with E85 and why?

[tegxsi]

1 step maybe but 2 steps colder is pretty extreme. I would think stock plugs would be fine especially if running high ethanol content. Do the any of the stage 2 tunes recommend colder plugs?

[purekoryo]

2 steps colder is pretty extreme. I would think stock plugs would be fine especially if running high ethanol content. Do the any of the stage 2 tunes recommend colder plugs?

A tuner recommended it.

[silvino]

Lost my longer post due to mobile Chrome sucking.

Basically, be careful with advice from this board and with your plug choice. People have picked the wrong standard NGK plug and melted plugs with big consequences.

The plug of choice currently.comes gapped correctly. "Denso (5749) IKH01-24 Iridium Racing Spark Plug.". It's what a bunch of fast, high hp stock turbo and BT kit cars are running. Expensive unfortunately but worth the peace of mind. I plan to change mine every oil change or two.

[tegxsi]

I've seen the Denso IKH0124 on Iroz website and they are a must when running upgraded turbos.

All I can say is run them, pull them out and read them to see if they are good.

[purekoryo]

How do they compare to the NGK R7437-9 iridium plugs?

Lost my longer post due to mobile Chrome sucking.

Basically, be careful with advice from this board and with your plug choice. People have picked the wrong standard NGK plug and melted plugs with big consequences.

The plug of choice currently.comes gapped correctly. "Denso (5749) IKH01-24 Iridium Racing Spark Plug.". It's what a bunch of fast, high hp stock turbo and BT kit cars are running. Expensive unfortunately but worth the peace of mind. I plan to change mine every oil change or two.

[silvino]

This is part of what disappeared in my longer post. You can't necessarily compare heat ratings across manufacturers directly. I haven't spent a time of time trying to decipher what other plug would reach a similar heat rating as the plug we're currently using so I can't say more than knowing of someone that gambled and paid a price using the wrong NGK plug thinking they went colder. You could always contact NGK for advice.

How do they compare to the NGK R7437-9 iridium plugs?

[saxon]

How do they compare to the NGK R7437-9 iridium plugs?

no issues with those plugs gapped to .024 with my car :)

not sure id run them if i wasnt running ethanol though

[r26372]

This is part of what disappeared in my longer post. You can't necessarily compare heat ratings across manufacturers directly. I haven't spent a time of time trying to decipher what other plug would reach a similar heat rating as the plug we're currently using so I can't say more than knowing of someone that gambled and paid a price using the wrong NGK plug thinking they went colder. You could always contact NGK for advice.

I have those save exact NGK plugs and they come pre-gapped to .025 basically which is in the target range recommended by APR. They are heat range of 9, and this is directly from APR 2 weeks ago suggesting these plugs. Certainly there are other NGK plugs that won't work well, and perhaps that was an issue in the past, but this was literally 2 weeks ago. I've installed them and have no issues.

[purekoryo]

no issues with those plugs gapped to .024 with my car :)

not sure id run them if i wasnt running ethanol though

did you notice a difference after you switched while on E85?

[purekoryo]

I have those save exact NGK plugs and they come pre-gapped to .025 basically which is in the target range recommended by APR. They are heat range of 9, and this is directly from APR 2 weeks ago suggesting these plugs. Certainly there are other NGK plugs that won't work well, and perhaps that was an issue in the past, but this was literally 2 weeks ago. I've installed them and have no issues.

Same for you: what difference have you noticed? what stage tune and fuel are you running?

[Kai@EliteMS]

I'm running stock plugs on hybrid turbo car, gapped to 0.024"

[purekoryo]

I'm running stock plugs on hybrid turbo car, gapped to 0.024"

im gonna pull my hair out!!! Don't know which to go with! What was the stock gap?

- - - Updated - - -

Maybe a better question to ask everyone is how our stock plugs ACTUAL heat range compare to the Denso and NGK mentioned in this thread?

[r26372]

Same for you: what difference have you noticed? what stage tune and fuel are you running?

I'm running stage 1+ APR tune which included a FMIC and inlet pipe. Currently on the 93 tune after running e85 all summer. I was having cold weather issues when temps dipped to low 20's and APR thought I perhaps jacked up the plugs when switching from E85 down to 93. Car idles and runs fine. Haven't had a chance to see if the plug swap helped my cold temp issue as it's been warmer than that in the last couple of weeks. But in 35+ temps car seems to pull harder to redline than prior. Could be placebo, so who knows. I need to update my Audi ECU to box code 4 as this appears to have solved the cold weather issues on the Unitronic platform as well as cold temp issues on the RS7 platform. But, if running e85 it's very common to switch to a colder plug which is how I'll run the car 2/3 of the year. I wouldn't swap plugs if just running the 91 or 93 stage 1 or 1+ though. E85 burns different and hence the plug change makes sense.