Dyno'd my 16 psi GReddy - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-01-2008, 05:34 PM   #1
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Default Dyno'd my 16 psi GReddy

Water injected. DIY tuned.

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Did 3 dyno runs and recorded the lowest, first run gave 266 bhp.
Too much water is going in mid-range, causing the torque drop. Still more tweaking to do.
Running e-manage ultimate and 460cc injectors. The HSV is being controlled by the sub-injector map. Top end running 11.2:1 so could have gained more power by leaning it out a little.
Previous dyno yielded 243 bhp (before water injection was fitted).
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Old 11-01-2008, 06:31 PM   #2
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Those are really good numbers!

BTW, the 51st State? Are you my neighbor? If so, you should visit sometime and tune mine!

Congrats.
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Old 11-01-2008, 06:50 PM   #3
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Makes me wish I'd dyno'd mine with the WI hooked up
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Old 11-01-2008, 10:59 PM   #4
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nice! is that a record for the greddy? on a piggyback no less.

what is your setup as far as wastegate goes. you're losing 60ft lbs of torque between 5400-7000.
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Old 11-01-2008, 11:23 PM   #5
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What kinda intake temps are you getting?
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Old 11-01-2008, 11:32 PM   #6
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Impressive.
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Old 11-02-2008, 08:16 AM   #7
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Cheers for the comments guys

Quote:
Originally Posted by Rafa View Post
BTW, the 51st State? Are you my neighbor? If so, you should visit sometime and tune mine!
Yea I'm in sunny England (about an hrs drive north of London), if you ever happen to be in the area just give me a shout

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Originally Posted by Mach929 View Post
what is your setup as far as wastegate goes. you're losing 60ft lbs of torque between 5400-7000.
I'm using a helper spring, and I've changed the wastegate actuator air feed over to the intake side, just before the throttle plate near the BOV.
Boost is holding 16-17 psi to redline. The timing is very advanced on this setup, the base timing is still circa 7 degrees advanced from 5500 to redline. I'm pulling 4.5 deg from a base timing of around 12 or so (16 psi), and that increases to 5 deg pulled at 17 psi.
The water injection makes this possible, excellent at keepin knock under control and keeping temps down.
I get the impression that the GReddy compressor is losing efficiency at these levels, causing the torque to drop off and adding more heat. Every high boost GReddy dyno plot I've seen has the characteristic torque drop at high revs - even when the boost is holding.

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Originally Posted by Saml01 View Post
What kinda intake temps are you getting?
Good question, the simple answer is I don't know (yet). My intake air temperature probe is disconnected because I'm in the process of relocating it though its been like this for months.
Before fitting the water injection I did a trackday (just over a year ago) running 15 psi and saw virtually no knock. I'm running an extra psi or two and with the additional water injection I think temps are under control - but I won't know for sure until I get the sensor installed. The main difference between this dyno run and the previous is the ignition timing advance, at its peak its added a good 17 bhp.
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Old 11-02-2008, 09:21 AM   #8
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Which WI kit are you using?

BTW, I'm only 7 hours away from London myself
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Old 11-02-2008, 09:51 AM   #9
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Quote:
Originally Posted by Rafa View Post
Which WI kit are you using?
Its homebrew mate. I'm using the Aquamist high speed valve (120) which is controlled in the same way as a fuel injector. The EMU has a 16 by 16 pixel "sub-injector" map that can be used for controlling additional fuel injectors, I'm using it to control the HSV. So it is fully mappable wrt boost vs RPM. The HSV has a push-fit water inlet and outlet that terminates with the twin 0.5mm nozzles mounted in the intercooler outlet.
I'm also using one of the 12V relay/solenoid outputs (again, 16 by 16 map) to activate the 150 psi devilsown shurflo pump. I'm using the other solenoid map to control the O2 clamp.
Additionally I'm using an Aquamist DDS3 V8 flow monitoring system as a safeguard, it displays the water flow (among other features) so if theres a problem with the system, such as low water level or a clogged nozzle, it'll let me know.
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Old 11-02-2008, 03:31 PM   #10
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Quote:
Originally Posted by tritium View Post
Its homebrew mate. I'm using the Aquamist high speed valve (120) which is controlled in the same way as a fuel injector. The EMU has a 16 by 16 pixel "sub-injector" map that can be used for controlling additional fuel injectors, I'm using it to control the HSV. So it is fully mappable wrt boost vs RPM. The HSV has a push-fit water inlet and outlet that terminates with the twin 0.5mm nozzles mounted in the intercooler outlet.
I'm also using one of the 12V relay/solenoid outputs (again, 16 by 16 map) to activate the 150 psi devilsown shurflo pump. I'm using the other solenoid map to control the O2 clamp.
Additionally I'm using an Aquamist DDS3 V8 flow monitoring system as a safeguard, it displays the water flow (among other features) so if theres a problem with the system, such as low water level or a clogged nozzle, it'll let me know.
Cool man; thanks for the info!

I think I'll be able to do something similar with my AEM
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