GTX2867R, FM log mani, 1.8, 8.4cr - Miata Turbo Forum -Boost cars, acquire cats.

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Old 11-01-2015, 11:38 AM   #1
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Default 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




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GTX2867R, FM log mani, 1.8, 8.4cr-20151031_175429.jpg   GTX2867R, FM log mani, 1.8, 8.4cr-20151031_175419.jpg   GTX2867R, FM log mani, 1.8, 8.4cr-153833d1446392203-gtx2867r-fm-log-mani-conservative-tune-20151031_175429.jpg   GTX2867R, FM log mani, 1.8, 8.4cr-153834d1446392354-gtx2867r-fm-log-mani-conservative-tune-20151031_175419.jpg  

Last edited by sixshooter; 11-02-2015 at 09:03 AM.
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Old 11-01-2015, 12:33 PM   #2
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screenshot of spark map?
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Old 11-01-2015, 05:44 PM   #3
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GTX2867R, FM log mani, 1.8, 8.4cr-80-tuning_map_nov15_042780414f0f981cdbc5ab58516a999dccc0fcd4.png  
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Old 11-01-2015, 05:51 PM   #4
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Old 11-01-2015, 08:00 PM   #5
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Nice, thanks. That's about where I am right now with timing & afr on my gt2560r
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Old 11-01-2015, 08:48 PM   #6
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I don't think I'd call that spark table conservative.
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Old 11-01-2015, 08:58 PM   #7
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I wouldn't call it conservative either.

Why is the spark table 8x8?
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Old 11-01-2015, 09:02 PM   #8
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Quote:
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I wouldn't call it conservative either.

Why is the spark table 8x8?
It is an MS1, so smaller fuel and spark tables.
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Old 11-01-2015, 09:22 PM   #9
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Quote:
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very conservative spark
Ha, you're running within a couple degrees as much as I'm running on E85. I would hardly call that very conservative.
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Old 11-02-2015, 09:02 AM   #10
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Quote:
Originally Posted by Savington View Post
I don't think I'd call that spark table conservative.
Even with 8.4cr and 93 octane? Hmm. What would you expect for the top couple of rows?
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I wouldn't call it conservative either.
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.

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Ha, you're running within a couple degrees as much as I'm running on E85. I would hardly call that very conservative.
Are you using low or high compression pistons with the E85?
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Old 11-02-2015, 12:04 PM   #11
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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.
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Old 11-02-2015, 12:22 PM   #12
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Quote:
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...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 **** on a begi cast manifold.
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Old 11-02-2015, 12:35 PM   #13
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Yep, I remember that.
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Old 11-02-2015, 12:43 PM   #14
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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)
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Old 11-02-2015, 02:17 PM   #15
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Quote:
Originally Posted by sixshooter View Post
...
Are you using low or high compression pistons with the E85?
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.
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Old 11-02-2015, 05:50 PM   #16
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Quote:
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...I'm not really impressed with how late that thing comes on though, that's for sure.
Me either. It has the .86 hotside but with ball bearings and a billet wheel I expected better.
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Old 11-02-2015, 06:59 PM   #17
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Quote:
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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.
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Old 11-02-2015, 08:23 PM   #18
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Quote:
Originally Posted by patsmx5 View Post
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.
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Old 11-02-2015, 11:15 PM   #19
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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.
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Old 11-03-2015, 12:10 AM   #20
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Quote:
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Great advice if you want to blow your motor up.
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.
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