FM2, 1.8 w/ NB head - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-26-2010, 03:06 PM   #1
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Default FM2, 1.8 w/ NB head

Hey guys, just thought I would post my somewhat decent street dyno (log from hydra processed by data log lab). These are 2nd and 3rd pulls, just putting them up before my dynotune on Tuesday.

Everything was on a FM2 with the following composition:

FM2 w/ hydra
GT2560r at 8psi
1.8 (1896 - 1mm overbore) bottom end (9:1 wiseco pistons, carillo rods) w/ rebuilt 99 head and VICS intake (with solenoid, opens @ 5250 currently)
Arp main and head studs
Gapped copper NGK plugs with new wires,
Racingbeat exhaust (not sure on diameter, 2.75"?) and FM race pipe (catless)
It was ~ 80F out at the time, and shortly before dark. Running using BP 92octane

Looks like ~185whp and ~160tq at 8psi. I hope to make 14-17psi (15 is my goal, but who knows ) 3rd is choppy because that's the best he could make it, not sure what that huge dip in power was.



Post-dyno tune (only really got 12psi and loads more torque):

Edit: This graph is off, I didn't set wheel size nor weathering info. I'll fix it later today and re-upload. I made ~200whp and 184 tq.

I'm a little disappointed in the performance considering I spent hours getting the car tuned. My wastegate arm is fluttering for lack of a better term, and not allowing the turbo to build constant boost. Or that's what the tuner said. The turbo hit 12.5psi then struggles to maintain it, looking like a syn wave more then a straight graph. Not sure where to go from here.

Last edited by Der_Idiot; 07-02-2010 at 12:49 PM.
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Old 06-29-2010, 10:59 PM   #2
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Got tuned today, had a few issues that prevented it from being of higher power. First off, the bracket FM uses for the wastegate actuator is is bendy. So much so that the thing flexed (roughly 3/8") at less then 2psi, so we ended up making a curved bracket to bolt to the threaded hole on the turbo 80 counter-clockwise from the top-left bolt for FMs bracket. The next issue we had was the actuator was too weak to hold the gate closed above 11psi or so, so we ended up tuning it best we could to get the power we could.

All in all, I am satisfied with what we got, I'll have pictures up when I get a chance. I'll also include a few logs, current map as well as dyno graphs (probably sometime tomorrow).
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Old 06-29-2010, 11:12 PM   #3
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Get rid of the baby turbo and be a man. Nice though for what you have
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Old 07-01-2010, 12:46 PM   #4
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I've been debating it, we'll see
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Old 07-02-2010, 12:35 PM   #5
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Update. Anyone know when a 3071 will start boosting on a 1.9(1mm overbore) with a NB head? I'm considering that or a 2860 or even a china 2871, but with my forged bottom end I figure I can take over 350...

Last edited by Der_Idiot; 07-03-2010 at 07:24 PM.
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