I was wondering all about this because im running tr6's now and my tuner said to get rid of them and put 55's in would run better.

 

How much nitrous are you spraying?

 

What would you recommend for my setup on E85? 3346 or 3177? What would need to be adjusted in the tune?

 

I'd find a new tuner

 

I don't have any experience with E85, using it or tuning with it. It's not available here. For that reason, I've never even researched it, so I'm probably not the right guy to ask. Sorry.

 

What are you using now? A br6ef or #3177 should work great. It helps with heat, load, and timing issues too. I had to use a br7ef plug for my LS1 cause of the tight qench, and it will be good for up to a hundred shot for me. I will go to an 8 range non-projected tip on the bigger shots. My Ls1 did not like a tr6.

I like non projected for nitrous and higher comp ratios.

 

Right now, I am using the projected TR6, mainly because I didn't know the benefits between projected and non until now.

It runs fine, starts up every time, and pulls strong, but it is also the only type of plug I have run with the blower, so I don't have any basis for comparison.

 

I swaped TR6s into my 4.8, I had em gapped out too far, pulled em in to .030s and clearned up a ton, But on the bottle I still get a surge sometimes, off the juice fine, spray, it's a little testy, but still did a 14.88 at 98.

 

im running a 150 shot

 

I'd go with the non-projected 6's, and datalog your next runs. If you're KR is good to go, then you're usually good to go.

If your track will let you(ours won't), shut the engine off right after your run. You want to read the plugs after a WOT pull, no idling time at all. Tow it back to the pits, and pull the plugs to read them. The strap "color change" will tell you if you have the right heat range.