stumbling and choking after 5,000 rpm? - Page 6 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-20-2007, 02:03 PM   #101
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The little black box was causing the over fueling.
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Old 01-22-2007, 06:52 AM   #102
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I dunno what the BLACK BOX is doing to the fuel... but once out.. everything is fine!

Running now with an 1.7:1 AFPR... working very well with the 1.8 injectors for fuel.. but can't really tell once its on the dyno and cheak the A/F.
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Old 01-22-2007, 09:58 AM   #103
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As I recall, the black box was pretty heavy-handed...I think it just fooled the ECU into thinking it was running cooler (like a 160° thermostat would) at all times which makes the car richer. It was pretty basic.

If you're only running a 1.7:1 AFPR now, and not the 12:1 Vortec, then you're running too lean at this point
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Old 01-23-2007, 03:03 PM   #104
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I think his 1.7:1 AFPR is a rising rate, meaning that the ratio increases as boost increases. So its like your raising the rate that the fuel ratio raises at!? Seems repetative.
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Old 01-23-2007, 03:14 PM   #105
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yeah, 1.7psi of fuel for 1psi of boost. = ( 1.7 x 5 ) + 50 = 58.5psi of fuel.

265cc injectors at 58.5psi of fuel can fuel 140rwhp, I'd say that's cutting it close.

are you trying to say 1.7:1, 3.4:2, 5.1:3, etc.?
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Old 01-23-2007, 03:20 PM   #106
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Definately lean.
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