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Heat Range/gap Size For E85 Rb25

arrydjay

By arrydjay,
in Engines & Forced Induction

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arrydjay Community Regular

arrydjay

Posted
Posted

So after a bit of a hoon yesterday my car started to miss a bit... it would drive normally, and then all of a sudden it would sound like a wrx for about 10-20 seconds, then it would go away and drive fine for a few more mins.

Today I took the plugs out and the white porcelain bit on one of the plugs was cracked...the rest looked all right although slightly white on the tips so I decided to go up from heat range 6 to heat range 7.

Now before this my car would miss with anything bigger than a .65mm gap, so i rezised the new plugs to .65 and threw them in....

Now the car is missing at idle and sounds really fkd up....

Im going to pull them out and try them at .8 gap and see what happens, but I just wanted to see what kind of plugs everyone else is running with E85....

Im really hopping that its just plugs and not something worse... car sounds pretty shite atm....

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The Dan Grand Master

The Dan

Posted
Posted

So after a bit of a hoon yesterday my car started to miss a bit... it would drive normally, and then all of a sudden it would sound like a wrx for about 10-20 seconds, then it would go away and drive fine for a few more mins.

Today I took the plugs out and the white porcelain bit on one of the plugs was cracked...the rest looked all right although slightly white on the tips so I decided to go up from heat range 6 to heat range 7.

Now before this my car would miss with anything bigger than a .65mm gap, so i rezised the new plugs to .65 and threw them in....

Now the car is missing at idle and sounds really fkd up....

Im going to pull them out and try them at .8 gap and see what happens, but I just wanted to see what kind of plugs everyone else is running with E85....

Im really hopping that its just plugs and not something worse... car sounds pretty shite atm....

1. You're doing it wrong

If you're breaking plugs then you aren't doing them correctly.

2. What cylinder temps are you measuring?

3. What HP do you make

4. What part number are you using and how are you regapping them?

scotty nm35 Grand Master

scotty nm35

Posted
Posted

It's a sign of detonation usually, not something you would hope for on e85.

Hopefully it's just the coil packs starting to fail. I use heat range 7's, the 6's I ran melted the tip fairly quickly. I would run 8's if they were available for the VQ. Gap them to 1.1 if you can, most RB's don't like more than .8 though.

arrydjay Community Regular

arrydjay

Posted
  • Author
Posted

guys, when I said the white porcelain bit was cracked, I mean the bit thats outside the cylinder...where the coil packs sit on top of, that insulation stuff.

The car is running 17psi atm and is around the 300kw area on the seat of pants dyno.

I pulled the plugs out, re gapped to .71 and the car was rough at first, but once it warmed up a bit it started to run ok.

Its still doing this weird thing but...runs fine for ages then all of a sudden just starts to miss real bad and sound like a wrx, then after a few seconds it runs fine again... only does it very sporadically, but it has made me too scared to give it a hit.

I also noticed an exhaust leak from the turbo/manifold and an air leak from the inlet manifold.... dropped it off at the shop today to get them to fix the leaks and then ill see how it goes.

arrydjay Community Regular

arrydjay

Posted
  • Author
Posted

They are brand new splitfire coil packs.... im just a bit worried because the car was fine until I went a bit crazy with a burnout, then 2 mins after that it started doing this weird shite....

Could it be a head gasket?

The Dan Grand Master

The Dan

Posted
Posted

They are brand new splitfire coil packs.... im just a bit worried because the car was fine until I went a bit crazy with a burnout, then 2 mins after that it started doing this weird shite....

Could it be a head gasket?

Yes it could be a head gasket

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