patsmx5

iTrader: (16)

Using someone else's dialed in timing map to "try" is a bad idea.

240_to_miata

iTrader: (2)

for the record i was talkin about scotts map, not hustlers. and its just to get the engine going and tune from there. u cant tell me all of you guys made all of your maps from scratch.

patsmx5

iTrader: (16)

I did.

But yeah most grab someone's. Most maps suck. I'm not surprised Brain had detonation with his tuning. He ran mid 12 AFR's IIRC and his timing was a bit agrressive IMO.

hustler

iTrader: (6)

I made my fuel table from scratch. Its not that hard. The spark table was a DIY copy that was stupid retarded. lol@people using my spark table.

240_to_miata

iTrader: (2)

yeah my NA maps were basicly from scratch. i started off with diy's but then ended up re-scaling everything for NA and just said screw it and started from scratch. Its not bad.. but id basically like to start with a drivable map and tune it asap.

hustler

iTrader: (6)

then use diy's map.

If you don't have det-cans, you will fail.\
/thread

Braineack

iTrader: (62)

I cleaned off the carbon and look at it closer, it really looks like the FOD that matches #4. Without seeing the piston in front of me I'm speculating. But it looks like a piece of something pressed its imprint in the squish area, hopefully not parts of a piston. But I didn't notice anything when looking at them initially.

The last two blocks that let go from detonation had no head damage what-so-ever, in fact this is the head of my first replacement motor whose ringlands failed.

My spark map isn't much more advanced than DIYs (16-17* @ 13-14psi) and I run between 12-12.3:1 in boost. It ran great everyday for 10 months straight as a DD with a couple autoxes and dyno runs for abuse.

levnubhin

iTrader: (30)

Scott, can you post your latest datalog?
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Kyrasis6

To me that looks like damage from a foreign object. Before installing the head though take some 400 grit sand paper on the tip of youre finger and debur the sharp edge of each combustion chamber, a .020" or .040" radius does wonders for reducing detonation.

Braineack

iTrader: (62)

Yeah, I've pretty much sided with that hypothesis. I've already smoothed it down, then hit it with 2000 grit. Will be going back on Monday.

Braineack

iTrader: (62)

sure: