GTX2867R, FM log mani, 1.8, 8.4cr
 

1.8, iron log FM manifold, GTX2867R, 3in turbo back, pump 93, MS1, Deatchwerks 750cc injectors, LS2 coils, 8.4cr Supertech pistons, Crower rods, Boundary pump, NA8 head ported by Miata2fast, stock valves, Supertech light double springs, stock cams.

The blips in the first run were where it was hitting overboost at about 15.25psi

About 15psi
262whp @ 5810rpm
252tq @ 5050rpm

https://www.miataturbo.net/attachmen...ine=1446468395


https://www.miataturbo.net/attachmen...ine=1446468585

screenshot of spark map?

Nice, thanks. That's about where I am right now with timing & afr on my gt2560r

I don't think I'd call that spark table conservative.

I wouldn't call it conservative either.

Why is the spark table 8x8?

It is an MS1, so smaller fuel and spark tables.

Ha, you're running within a couple degrees as much as I'm running on E85. I would hardly call that very conservative.

Even with 8.4cr and 93 octane? Hmm. What would you expect for the top couple of rows?
There seems to be a consensus brewing.
I seem to recall adding two degrees to the top of the map back a year and a half ago because I felt there was too much heat in the exhaust because of the (I thought) overly retarded timing. I saw a few others running more and felt I could safely add a couple.

Are you using low or high compression pistons with the E85?

IMO the 183 row is really the one that's kinda aggressive, and maybe the 212 by 1 or 2, top row aint that bad.
and y'all have proper fuel and not CA 91oct water, so I don't even think it's that bad.
also the spark is not 8x8, that's the afr target table, unless we're looking at different tables.

...I'm not really impressed with how late that thing comes on though, that's for sure.

I think that is due to the cast manifold. Hustler had some old threads about his 2860 spooling like donkey shit on a begi cast manifold.

Yep, I remember that.

I know it's not apples to apples but at 10:1 and with VVT I was able to get over 200lbft by 3750 rpm on a precision 4828 on a BEGI cast manifold. (195kpa)

FM 9.0:1 Weisco pistons. Nothing crazy.

FWIW I think your spark map is great if it doesn't knock, just noting that's not super conservative.

Me either. It has the .86 hotside but with ball bearings and a billet wheel I expected better.

On my GT3271, I found a lot of spoolage by not running pig rich while it spools. I ran it around 14:1 at 100kPa, 13:1 at 140kPa, etc, tapering to target AFRs when you get to target. That made a very very nice improvement in both driveability and spool. Worth a shot since your posted AFR target table is richer than needed at very low boost.

Great advice if you want to blow your motor up.

Lol. Please give me some notes if you have any to share. I'm winging it carrying the Miata flag in the land of vettes and mustangs.

I didn't say run stoich at full boost. I did what I wrote for a few years and didn't blow an engine up at 140kPa or 100kPa doing it. Det cans and common sense.