1.8L DIY dyno - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-21-2006, 07:00 PM   #1
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Default 1.8L DIY dyno

1995 junkyard engine
GT2560
JGS log
AEM ECU

14psi at ~3500, dropping of to 11 psi at 6500
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1.8L DIY dyno-miata-dyno.jpg  
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Old 11-21-2006, 07:12 PM   #2
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Nice! What's the rest of your system? Do you have your a/f log?

What controls boost? Chart gets pretty erratic, even with a lot of smoothing.
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Old 11-21-2006, 07:28 PM   #3
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nice numbers...yeah more details please
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Old 11-21-2006, 07:42 PM   #4
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sweet
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Old 11-21-2006, 08:04 PM   #5
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looks nice! got the .drf file?
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Old 11-21-2006, 11:00 PM   #6
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The car is a 1990 with an ACT extreme clutch, and 1.8 diff with RX-7 LSD. I'm running an Ebay intercooler with a 2.5x19x10 core, I think. I've got a DIY dual feed rail, RC550 injectors, an external gate, DIY 2.5-inch exhaust with the wastegate plumbed back into the exhuast about 25 inches downstream.
.

I have the AEM controling the boost. I had problems with the boost control on the dyno that I've now worked out. Now that it's got a steady 15psi of boost, I'd guess I'm making about 250whp.

Here are the AFR and boost logs. The wideband and the map sensor on the dyno didn't jive with my datalogs. Where the dyno showed an AFR of 12.5, my wideband read 11.5.
Also, that 16 psi spike was a 14psi spike on my datlogs.
The owner of the shop told me that the wideband on the dyno always reads lean and that the boost readings were also a little off.

FWIW, this is my third DIY turbo Miata and 250whp ain't shi* anymore...it's starting to feel SLOW. I NEED another 75whp or so more. Only problem is that it'll cost 4K to do it right (GT3071, rods, pistons, etc.), which ain't happening. I wonder how long my internally stock engine would last with a GT3271 @15psi?
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1.8L DIY dyno-dyno-afr.jpg   1.8L DIY dyno-dynoboost.jpg  

Last edited by lukydvll; 11-22-2006 at 01:21 AM. Reason: stupidity
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Old 11-22-2006, 02:33 AM   #7
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Curve looking mighty fine.
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Old 11-22-2006, 02:37 AM   #8
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Good numbers!

Quote:
Originally Posted by lukydvll View Post
I wonder how long my internally stock engine would last with a GT3271 @15psi?
Not too long, hehe. That would be around 300whp, with perfect tuning might last a bit but if you beat on it, good luck.
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Old 11-22-2006, 11:13 AM   #9
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350 is what andy wants but that is with a standalone, and built 2 L
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Old 11-22-2006, 12:49 PM   #10
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I am going to dyno next week with magna so I can tell you more about how much power the GT3271 is capable of after that dyno. I am going to run a maximum of about 16-17psi. I am still on a stock computer but have been running this same setup for years with great success. I am curious to find out how much power I can make with the stock computer in place. 250whp isnt slow but it can feel that way after you get used to having more.
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Old 11-22-2006, 12:55 PM   #11
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it's gonna be fun KY dyno day. stock ecu only
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Old 11-22-2006, 03:08 PM   #12
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You should be able to hit 300 whp on pump gas with water injection with ease. Whats your total timing at peak boost?
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Old 11-22-2006, 03:14 PM   #13
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Where in KY are you guys going to the Dyno, i'm pretty close being in TN. Just out of curiousity of course, i'm not looking to crash your dyno day.
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Old 11-22-2006, 04:23 PM   #14
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Automotion in louisville Quite a ways away from you but we should have room they arent normaly to full. It would be up to Andy but i say the more the merier. WOT he hasnt gotten the WI installed last i talked to him so he is just running the normal setup. I'll be running my 1.8's and 10-12 psi if i can get her lined out right
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Old 11-22-2006, 04:24 PM   #15
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Ohh i run the full 26 degrees of miata timming as i am stock in the timming respect.
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Old 11-22-2006, 04:26 PM   #16
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so if your set at 10* I assume your at 26* total advance.

what's the total advance verse what we see on our crank wheels?
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Old 11-22-2006, 04:41 PM   #17
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Quote:
Originally Posted by Wideopentuning View Post
You should be able to hit 300 whp on pump gas with water injection with ease. Whats your total timing at peak boost?
ill be running 110octane fuel since its available at the pump here. I am going to only retard 4* from the stock 10btdc. I think Ill be right around 300whp on 16-17psi.
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Old 11-22-2006, 04:57 PM   #18
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sweet, looks like good power, but It's annoying your boost dropped. I might get a dyno of my setup which is almost the same but with a 1.6 if we ever have a dyno day round here. I'll probably just take it to the 1/8th instead.
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Old 11-26-2006, 01:16 AM   #19
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Al,
How's your experience been with the Megasquirt?
I used MSnSE on my Miata for about a month... Pretty impresive for the price.
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Old 11-26-2006, 01:19 AM   #20
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I really like it so far. Ironing out the problems at first was a total bitch, but for the past 1000 or so miles, its been great.

Just wondering, why did you switch?
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