I think im going with a TR8 or 9 on heat range mostly due to my car being high compression 12.5.1 and boosted. Im attempting to push out around 800Whp also with the aid of 100% alky inj. What is a good starting gap?

 

.020-.025

 

Thank you!

 

If gap is incorrect, itll break up on the big end, or itll run/foul at low loads/part throttle. I usually start at 30, and see what the setup requires. Ive ended up with as little as 18 before, and sometimes as much as 40, with out issue.

Your mileage may vary!

 

E85 like hotter plugs to light the fuel off. You might want to use a 7.

 

I use an NGK 9 and it fires right up and so far no issues fouling. I would think a 7 would be fine non boosted but surely that is too hot of a plug for a boosted application. No?

 

I wanna hear more on this too.

 

Yea i imagine a 7 is a tad on the hot side for my 12:5.1 turbo motor. Id rather start cold and move up to a hotter plug. I just need a ballpark safe gap. Getting to my plugs is super easy so fine tuning on the dyno isnt a big deal.

 

From what all the experts running this fuel with high compression on boost say, Run a hotter plug like a 7 to fire off the fuel and have a complete burn. I run a BR7EF at 24lbs of boost with 10:1 compression and it runs great. I'm no expert but from what I've read from people that know this fuel they all run a hotter plug and it works better, makes more power, and faster ET's and MPH. And these guys are at 14:1 compression. Get on Yellowbullet and so some searches on E85. There is a lot of good info on there.

 

This is the stuff we need to get out there. I just had mine tuned. Would it hurt to go ahead and change to a 7 then and run it with that tune? Or would the tune have to be changed? If I am thinking correctly the tune probably is fat to help with firing off the cold plug? I was not going to race the car at all until we get the E85 around here. Right now it is E70. Then I was going to have another quick tune again before I hit the track. Do you think I should go ahead and swap to the same NGK but in a 7? Or only if I tune it with that plug first. On the NGK 9 it is at 14 degrees timing at full boost and 10.5 AFR on a gas scale.

Thanks for helping to better understand this fuel. I have heard both ways.

 

I run .025 7's.

 

On E85? Just want to make sure.

 

yep. 1500 street miles so far.

 

sweet!

 

Do you mind sharing any other info? You can pm me if you want. I am curious on AFR, timing at full boost and what boost you are running? Also, gears and what size rear tire. You have a sweet car.

 

Wicked IIRC you asked me this and I pointed you to the E85 facts and myths thread on yb. The experts with e85 say use a richer afr(gas scale) than you would with gasoline(10.1:1-10.9:1) and a 7 or 8 plug under big big boost. Fatten it up with the 9 range plugs you have now till it wants to foul/break up from fuel, and then step the heat range up. Do this and repeat till you feel comfortable.


That is what the experts over there are saying. I have no experience, but if e85 is anything like methanol, the more you can burn and fit into the combustion chamber and light off and use the more power you will make.

 

Out of curiosity what Ngk plug would you use with an n/a application, around 11:1 cr and e85?

 

Oh And plug gap?

 

.028 here

 

I run .75 lambda at wot. Motor is 9.5 cr 404. Timing is at 22* with 12psi