RC Injectors causing rough idle?

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Old Jun 18, 2017 | 04:13 AM
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Default RC Injectors causing rough idle?

I'm running RC 750cc injectors. I have a sporadic misfire at idle. I've read that this is kind of a common thing with RC injectors. My question is is there any way to fix this and is it bad for the car? I included pics of my map in Hondata.
Setup is
d16z6 .75 over
8.8:1 wiseco pistons
Greddy 18G Turbo
Walboro 255 pump
stock rail and FPR

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Old Jun 18, 2017 | 08:31 AM
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Default Re: RC Injectors causing rough idle?

Not the injectors unless they are very dirty.

I run 1000cc injectors and my idle is solid at 14 afr at 800 rpm
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Old Jun 18, 2017 | 08:33 AM
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Default Re: RC Injectors causing rough idle?

you should have a saddle area for fuel.

You dont idle in one cell. Its interpoolating between 4. Make those four cells the same and the sorrunding ramp up
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Old Jun 18, 2017 | 08:35 AM
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Default Re: RC Injectors causing rough idle?

Originally Posted by DickensA
Youre timing map looks pretty weird

are you at 1 degree btdc at idle?
I'll have to look. It shouldn't be. I haven't touched the timing aside from 1 degree per lb of boost.
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Old Jun 18, 2017 | 08:36 AM
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Default Re: RC Injectors causing rough idle?

Sorry i didnt notice you posted the fuel map in percentage

post your timing map and your ignition corrections for idle
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Old Jun 18, 2017 | 11:43 AM
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Default Re: RC Injectors causing rough idle?

Originally Posted by DickensA
Sorry i didnt notice you posted the fuel map in percentage

post your timing map and your ignition corrections for idle
I've never messed with the ignition Comp either.


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Old Jun 18, 2017 | 01:05 PM
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Default Re: RC Injectors causing rough idle?

Go into the idle parameter

it should be an ignition timing table for idle
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Old Jun 18, 2017 | 03:40 PM
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Default Re: RC Injectors causing rough idle?

Originally Posted by DickensA
Go into the idle parameter

it should be an ignition timing table for idle
This one?
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Old Jun 18, 2017 | 04:13 PM
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Default Re: RC Injectors causing rough idle?

Yup change the ign from -5 to -10

and from 5 to 10

that should help keep your idle steady then mess with the fuel to get it where you want
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Old Jun 18, 2017 | 04:20 PM
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Default Re: RC Injectors causing rough idle?

Originally Posted by DickensA
Yup change the ign from -5 to -10

and from 5 to 10

that should help keep your idle steady then mess with the fuel to get it where you want
Ok I will give that a shot. Would you mind explaining exactly what that does?
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Old Jun 18, 2017 | 04:25 PM
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Default Re: RC Injectors causing rough idle?

You mean these ones correct?
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Old Jun 18, 2017 | 06:29 PM
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Default Re: RC Injectors causing rough idle?

The parameters mentioned, I don't believe would cause a miss at idle. Only keeping it from going higher and lower.

How wide is your plug gap? Copper plugs? A/f ratio at idle?
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Old Jun 18, 2017 | 07:12 PM
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Default Re: RC Injectors causing rough idle?

Originally Posted by cruizinmax
The parameters mentioned, I don't believe would cause a miss at idle. Only keeping it from going higher and lower.

How wide is your plug gap? Copper plugs? A/f ratio at idle?
I believe .30 for gap. They are the OEM NGK'S. A/f is between 38.9 to 4.7. I'm having trouble getting it to be stable for some reason. It seems to happen more when it's up around 14.7. Like I said the miss is very sporadic.
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Old Jun 18, 2017 | 09:12 PM
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Default Re: RC Injectors causing rough idle?

If your A/F is around 14.7:1 with RC (Lucas style) injectors, it is likely that the engine will stutter sporadically. If you richen the mixture up to the 13.0-13.5:1 A/F range, the idle will clean up... however, this may foul your spark plugs if the car idles for long periods of time.
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Old Jun 19, 2017 | 02:26 AM
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Default Re: RC Injectors causing rough idle?

Originally Posted by JRCivic1
If your A/F is around 14.7:1 with RC (Lucas style) injectors, it is likely that the engine will stutter sporadically. If you richen the mixture up to the 13.0-13.5:1 A/F range, the idle will clean up... however, this may foul your spark plugs if the car idles for long periods of time.
I've read that other places too. What causes this
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