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Old 08-31-2016, 11:14 PM   #1
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Default Help With REQ fuel and RX8 Injectors

Hey so i've been running a registered mega squirt (MSPNP2) for a while now on stock 1.6 injectors without a problem. I recently swapped them for 430cc RX8 injectors. I scaled the REQ fuel value down based on the difference in percentage of how much the injectors output, about 6.2 I believe. The car wont start because the engine begins to flood. I have no idea whats going on. The car was fine at 12.3 with 230cc but now at 6.2 with 430cc its too rich to start. My current solution has been to scale the REQ fuel down to like 3.8 or something extreme for my injectors and even then i have to scale the cranking pulsewidth and afterstart enrichment down significantly and depress the pedal to clear the engine enough for it to start. Any thoughts?

PS. The injectors are at 0.900 Dead time
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Old 09-01-2016, 08:53 AM   #2
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are they leaking?
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Old 09-01-2016, 09:08 AM   #3
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Here is from the getting started MS3 Manual:

3.4.7.2 Cranking pulse
This curve allows you to specify an initial pulse, in milliseconds, that is fired during cranking. There is one pulse per cylinder "event." You can set the pulse width as a function of coolant temperature. As this curve is in raw pulsewidth, if you swap injectors you will need to retune it.

Reference: http://www.msextra.com/doc/pdf/Megas...ing_Up-1.3.pdf

I think originally, with MS3, it was scaled to Reqd Fuel.

EDIT: I may be full of it. I don't have TS at the moment, and there is conflicting information between the manuals. Getting Started is not same info as Tuner Studio Lite.

Last edited by DNMakinson; 09-01-2016 at 09:17 AM. Reason: Bad advice retracted.
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Old 09-01-2016, 09:19 AM   #4
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with MS2 & MS3, all you should have to change is the REQ_FUEL.
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Old 09-01-2016, 10:14 AM   #5
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Come on brain, thatd be true is all injectors had zero deadtime and were linear at low duty cycle.

youre better than this advice.
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Old 09-01-2016, 10:29 AM   #6
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you forgot atomization and flow patterns...

I was speaking in general terms and replying specifically to DKM's post about the cranking table, which is scaled in Pulse %, not ms.
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Old 09-01-2016, 04:46 PM   #7
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Running it i have no sign of leaks on the injector seals or anywhere else.
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Old 09-02-2016, 05:50 PM   #8
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here it is
Attached Files
File Type: msq StockTune92.msq (108.3 KB, 10 views)
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Old 09-02-2016, 05:52 PM   #9
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was additional drivers always turn on for your tune?

is this pre or post injectors?
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Old 09-02-2016, 05:56 PM   #10
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This is pre injectors. is the same tune i just loaded it up on my desktop.
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