97 1.8 with Godspeed GT28 Turbo @ 11.5psi - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-24-2010, 09:09 PM   #1
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Default 97 1.8 with Godspeed GT28 Turbo @ 11.5psi

My 1990 Miata setup includes:

- 1997 1.8 motor (stock)
- AEM EMS ECU with 2 bar map sensor & GM boost control solenoid
- RX7 460CC Injectors
- Flyin Miata DIY Manifold & Downpipe
- Godspeed GT28 Turbo ($300 on ebay)
- 2.5" charge pipes with a Yonaka front mount intercooler
- OBX 2.25" Catback exhaust
That should be all the necessary stuff. I still have more timing to add, and I'm rich in some areas, but I'm really happy with the results:

214HP, 220 Ft/Lbs of torque

Considering I still have a 2.25" exhaust past my test pipe, and I'm running 11.5psi, I think the numbers are fantastic. Here's a picture of the dyno sheet, and my car on the dyno.





Last edited by dustinb; 05-24-2010 at 09:57 PM.
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Old 05-24-2010, 09:30 PM   #2
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looks like you stopped wayyyy early
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Old 05-24-2010, 09:45 PM   #3
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Yah, did you let off or did the car just really fall on its face?
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Old 05-24-2010, 09:56 PM   #4
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Well I wasn't doing the dyno, but it was really sunny and he could barely see his computer screen. I think he just saw the power drop a bit and then let off the gas.
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Old 05-24-2010, 10:07 PM   #5
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does you boost dip a few pounds around 3K? otherwise not bad at all.
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Old 05-24-2010, 10:09 PM   #6
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Definately not bad. What is your ultimate power goal?
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Old 05-24-2010, 10:11 PM   #7
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Quote:
Originally Posted by Braineack View Post
does you boost dip a few pounds around 3K? otherwise not bad at all.
Thanks Brain. In my AEM EMS I can choose how much correction to give on the wastegate, and I have it come on really strong, so I think that's why I'm seeing that dip. I basically just need to smooth it out and that should go away.

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Definately not bad. What is your ultimate power goal?
I'm basically at my power goal. Would like to be between 220-230 HP, and about the same torque. I'm guessing going up to a bigger exhaust and a bit more tuning will put me there.
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Old 05-25-2010, 07:35 PM   #8
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not bad, i wish we had those drag around dynos around here....
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Old 05-25-2010, 08:57 PM   #9
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The car looks great. I hope I get around the same numbers.
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Old 06-06-2010, 04:22 PM   #10
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Take it back to him and tell him not to lift until he hits the limiter.

Your hp doesnt seem to be dropping, it just looks like he was scared and let off.
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Old 06-06-2010, 04:30 PM   #11
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Quote:
Originally Posted by shlammed View Post
Take it back to him and tell him not to lift until he hits the limiter.

Your hp doesnt seem to be dropping, it just looks like he was scared and let off.
It was really sunny and he couldn't really see the monitor, so yah, I think he just didn't believe me I had a limiter and let off.

BUT on that note, the car is boosting way better now. I had an old vacuum fitting tapped into the cold side of my charge pipes and discovered it had fallen out. Now that's I've plugged it the car is.... better

Last edited by dustinb; 06-06-2010 at 04:50 PM.
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Old 06-06-2010, 04:49 PM   #12
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Thats a good looking car! props to you!
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Old 06-06-2010, 04:51 PM   #13
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Thats a good looking car! props to you!
Thanks! I like it
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Old 06-06-2010, 04:55 PM   #14
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how many miles on the motor if you dont mind me asking? stock head?
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Old 06-06-2010, 04:56 PM   #15
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Quote:
Originally Posted by na8psi View Post
how many miles on the motor if you dont mind me asking? stock head?
I got the motor in an unknown state from an auto wrecker. I did the the timing belt and the one that was on it was definitely not original, so I'm guessing at least 100,000kms on it. I've probably put about 7,000kms on the motor boosted, but only about 1000kms on this current turbo setup. The motor is totally stock.
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Old 06-06-2010, 05:00 PM   #16
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good numbers. I like.
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