1.8, 460cc inj Cranking Settings + Req Fuel - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-01-2009, 12:58 AM   #1
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Default 1.8, 460cc inj Cranking Settings + Req Fuel

Hey guys,

I have been trying to work out my tune a little better.

Can I see any of your guys cranking settings and req fuel? I followed instructions per megasquirt and did the 265/460 = 57% larger or what not to find my new values, but then the car wouldn't start. I slowly worked up and now I'm close to the original base map values and the car starts fine, which makes little to no sense.

Anyone else with a 1.8 MSPNP + 460cc rx7 injectors?
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Old 05-01-2009, 08:34 AM   #2
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so make the req_fuel 57% smaller. if it was 13 before, it's now 7.48

as the same as your cranking values and accel enrichments.

for the cranking pulsewidth you need to subtract 1.0ms before doing the math because that's opening and closing time.

so if 60*F was 8.0ms prior, the new value would = (8 - 1) * .576 + 1 = 5.0
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Old 05-01-2009, 12:13 PM   #3
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Nar, this might help since I run a 1.8 MSPNP and 460's. Brain gave you the math, and this will help you to see if your math is close. I have been running these settings since March of 08 without issue. Hope it helps.

REQ is 7.5
I left the injector opening time at 1.2
CPW-
-40 - 8.5
-20 - 7.6
0 - 6.9
20 - 6.2
40 - 5.5
60 - 4.9
80 - 4.1
100 - 3.2
120 - 2.5
140 - 2.2
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Old 05-02-2009, 02:11 PM   #4
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Quote:
Originally Posted by Braineack View Post
so make the req_fuel 57% smaller. if it was 13 before, it's now 7.48

as the same as your cranking values and accel enrichments.

for the cranking pulsewidth you need to subtract 1.0ms before doing the math because that's opening and closing time.

so if 60*F was 8.0ms prior, the new value would = (8 - 1) * .576 + 1 = 5.0
and when i use a 360cc injector an a 1.6, how do i calculate that?
please help
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Old 05-02-2009, 03:11 PM   #5
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Last edited by xitsam; 05-10-2009 at 05:52 AM.
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