E85 Tune up
Not always true...
Being under timed can kill a motor in 1 pass! Just depends on if it is severely under timed or slightly under timed.
E85 is showing to not want the tune up that gas does, meaning 2* for every 50hp of n20 jet may not hold true. That could be the the wrong tune up and hurt the motor on larger hits. And heck, +200rwhp with a single 57n jet....
Flame speed is going to dictate amount of advance required, and combo coupled with lambda is going to dictate flame speed. This is why I am suggesting starting small and step up incrementally.
Being under timed can kill a motor in 1 pass! Just depends on if it is severely under timed or slightly under timed.
E85 is showing to not want the tune up that gas does, meaning 2* for every 50hp of n20 jet may not hold true. That could be the the wrong tune up and hurt the motor on larger hits. And heck, +200rwhp with a single 57n jet....
Flame speed is going to dictate amount of advance required, and combo coupled with lambda is going to dictate flame speed. This is why I am suggesting starting small and step up incrementally.
Hi Brandon,
I quoted and made the key issues in bold.
I would agree with you that 23* is over timed for a 250 hit with a Lambda of 0.85. Put it at 0.77 Lambda (11.3 AFR on the gas scale) and that 23* might not be over timed.
I would argue that AFR has a bigger impact in actual cyl temps, the plug is just along for the ride. A hotter plug is going to melt down sooner than a cooler plug. I will also argue that a plug can be cooled some with additional fuel.
Lots of interesting information here. OP - have you made any more progress tuning or made a pass? I'm looking at putting together a higher compression LS7 on E85 and nitrous. The car has been mid-to-high 9s on a 175. I'm hoping 2 full points of compression, a larger cam, and E85 is going to be a game changer.
I know I am doing a 3 year bump on this, but Lil SS I would love to pick your brain on some things if you have the time. I know you haven't posted in awhile, so idk if you still even frequent the forum.
TECH Senior Member
Joined: Jun 2016
Posts: 22,289
Likes: 3,615
From: Central Cal.
Yeah, honestly the nitrous tune up should damn near mirror the motor tune up. Keep the air/fuel close and the timing out of it. Hell of a lot less likely to **** the bottom end out of it unlike if its richened up and a bunch of timing in it.
