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Old 10-01-2006, 06:53 PM   #1
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Default mad power at low-ish boost...

Howdy,
I did a power run this evening and saved a datalog. Car is set to 11psi but doesn't hit it (hits 10psi) due to my boost settings. So, from looking at the attached ,peak power is at 6224rpm, now reading the map value at this rpm would imply that I'm getting 217hp (with the 23hp for drivetrain losses added) at only 8psi (ish.. 155->157kpa) due to the pressure bleeding off . That can't be right surely...? Does anyone else get this kind of power reading?
Cheers,
Steve
P.S.Oh.. and yes I do use the same piece of road all the time and yes the power read from Dataloglab with these settings have matched the power given at dyno runs I've done exactly, so they are reliable.
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Old 10-01-2006, 07:26 PM   #2
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this is on a GReddy kit? Sounds about right. you should be somewhere around 180-190 at 8psi, could be more/less depending on the rest of the system. What are you using to record the hp, a G-tech pro?
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Old 10-01-2006, 09:02 PM   #3
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Dataloglab but as I say I find it v.close to my actual output (took a datalog while on the dyno and the power levels matched once I'd added 23 for drivetrain losses).

Yup, Greddy, 370cc inj, begi intercooler, Link ECU, 2 1/2 inch exhaust from downpipe back
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File Type: jpg peakpower (Small).JPG (50.7 KB, 24 views)
File Type: jpg Power graph194.jpg (91.2 KB, 14 views)
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Old 10-01-2006, 10:27 PM   #4
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on a dyno you'd see the tq drop and the hp level off after 5.5k

Three greddy kit dynos:

https://www.miataturbo.net/forums/sh...9&postcount=38

BrgRacer - 15psi
Olderguy - 15psi
Mach929 - 6psi


but i'm sure its close, id assume the hp to be a little less.
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Old 10-02-2006, 05:50 AM   #5
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Heres a photo of my printout from 2004(not 2001 as said previous)... HP kept climbing till 6.5krpm
http://www.mx5ireland.com/members/sr...hat%20step.jpg

Last edited by Stevo11; 10-02-2006 at 09:49 AM.
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Old 10-02-2006, 09:24 AM   #6
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Well, horsepower would keep climbing, given it's multiplied against torque and RPM, but your torque would be leveling off and dropping after ~5500 RPM.

Also, there's more than 23hp in drivetrain losses. In the driveline, a portion of the losses are fixed and a portion are a percentage loss. In a stock-engined Miata, at redline, it comes out to ~25hp. On a higher-torque car and/or one that revs past the stock car's 7200 RPM, the losses are greater.
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Old 10-02-2006, 09:41 AM   #7
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Yes, you are right, I was distracted by HP

http://www.mx5ireland.com/members/sr...ng/202Dyno.jpg
My losses were 23hp (edited), must see if I can get other dyno numbers from people there that same day.

Anyways, so, this kind of power is what I should be expecting from say .. 8.5psi?
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Old 10-02-2006, 06:48 PM   #8
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Did a bit of fiddling and gained 11hp tonight!! Sweet!
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