1.8 GT2554 at 12.5 psi - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-15-2010, 11:31 PM   #1
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Default 1.8 GT2554 at 12.5 psi

1.8 GT2554 at 12.5 psi-joecosta1.jpg

1.8 GT2554 at 12.5 psi-joecosta2.jpg

1.8 GT2554 at 12.5 psi-joecosta3.jpg

97M 1.8 with motor from a 95.

12.5 ish psi with a GT2554.

2.5 exhaust into an enthuza metal core cat and enthuza 2.5" turbo exhaust.

Mspnp with low imp RC550 inj

The red lines were my baseline run.

We also tried Brisk Racing Silver plugs which picked up 5hp.

We were starting the runs around 2K, but I guess he was hitting "record" later. I'm very happy and it was a great experience.
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Old 06-15-2010, 11:39 PM   #2
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Mustang or dynojet??
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Old 06-15-2010, 11:59 PM   #3
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Originally Posted by buffoon01 View Post
Mustang or dynojet??
Dyno Dynamics. A friend of mine who races in SCCA, tuned his 350ish hp race miata there. He says that dyno tends to read low.

My spool is kinda lame for a 2554. I'm running an MBC right now.
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Old 06-16-2010, 03:25 AM   #4
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That curve looks just about right for a Dynojet with a GT25r at that boost and setup... and a great tune. You've got a bit more boost in that little guy, but the upgrade to a GT2560 would let you make the same power and a bit more torque at a pinch less boost and if you go with EBC, even probably spool a bit better.
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Old 06-16-2010, 03:59 AM   #5
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I wouldn't be complaining about those numbers at 12psi with that sized turbo.
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Old 06-16-2010, 04:43 AM   #6
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Spool seems a little slow, what are you using for boost control?
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Old 06-16-2010, 05:58 AM   #7
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stock engine? how many miles?
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Old 06-16-2010, 09:18 AM   #8
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good numbers!
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Old 06-16-2010, 09:27 AM   #9
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Wait... you really picked up 5hp out of your spark plugs?
That seems crazy!

Is anyone else running these plugs?
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Old 06-16-2010, 10:17 AM   #10
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Same gasp used on both plugs?
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Old 06-16-2010, 10:48 AM   #11
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looks slow.
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Old 06-16-2010, 10:48 AM   #12
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great powerband man.

I have a hard time believing the plugs claim.
1st I've never even heard of those, and 2nd I've never heard of gaining 5hp unless your original ones were fouled to ****
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Old 06-16-2010, 10:54 AM   #13
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Quote:
Originally Posted by jbresee View Post
Wait... you really picked up 5hp out of your spark plugs?

I let my car cool off once after a few pulls...i picked up 4hp. true story.
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Old 06-16-2010, 04:46 PM   #14
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Thanks for the responses.


Brain - Actually, I'm very happy with the results. I just heard that particular dyno read low etc. It's all relative. The dyno operator was great to work with. He had dealt with MS on other cars (non Miata) and hated it. After working with mine and TunerStudio, he was impressed.


Sav - I'm using the NSX MBC

http://cgi.ebay.com/ebaymotors/NXS-M...Q5fAccessories


My wastegate actuator used to zip up to 8psi and stay there. Now, without the MBC, it will go up to 8psi. Then above 5K, will creep to 10psi. With the MBC hooked up, I can alleviate this a bit. It wont really creep per se. I can adjust to hit 12 psi without it going to 10 and creeping to 12 above 5K, but the spool isn't as good as I remember. Not sure if the diaphragm in the supplied actuator from FM wears out over time.

NA8psi - Stock Motor around 90,000 Miles


About the plugs...

It was something we just tried.

My old plugs were bkr-6e11's.

We worked with those for awhile. Installed the new plugs at the same gap. (.30 I believe). The next run gained 1hp, probably from sitting, although it was like 95 degrees in the shop. On that run, everything had leaned out. We got the a/f ratio back to where we had previous to installing the new plugs and gained another 5hp. Now, this might have happened with fresh bkr-7e's. It was just an observation.
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Old 07-24-2010, 08:43 PM   #15
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Quote:
Originally Posted by samnavy View Post
... and if you go with EBC, even probably spool a bit better.
With an EBC, the spool comes in faster, but less linearly, correct? The acceleration has more jerk in it?
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Old 10-20-2010, 06:35 PM   #16
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thats good power for that small snail! are you running a cat?

post spark map
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Old 10-20-2010, 07:09 PM   #17
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Quote:
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are you running a cat?
He said he was. Is your shift key broken?
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Old 10-20-2010, 07:10 PM   #18
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Quote:
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He said he was. Is your shift key broken?
no but my left-hand pinky is...
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Old 10-23-2010, 08:35 PM   #19
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You need a 3 inch exhaust. It will help your spool big time. Also would you care to post your spark map?
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Old 10-24-2010, 06:57 PM   #20
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Hi everyone!

Here are 2 spark maps.

The first, "Dyno Final", is what we ended up with and produced the graphs shown.

The other, "Post Dyno", is just my return to the numbers I had from 2300-3400 rpm and 128-183 map cells.

We originally lowered those cells and did a run. He liked where I had them before, but we never really revisited it.

Pulls great down there.

The second map is where I've been since.

Joe
Attached Thumbnails
1.8 GT2554 at 12.5 psi-jc-spark-dyno-final.jpg   1.8 GT2554 at 12.5 psi-jc-spark-post-dyno.jpg  
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