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Discussion Starter #1 (Edited)
So
I got some more funds together and its time to take the car back out.
Get the motor running as close to perfect (timing and plug reading) then retard the timing to the setting we have for our tune up on 1 kit. Burn out, stage , purge then hit it and afterwards read the plug and it should be clean. Adjust fuel pressure and timing accordingly.
Then try the second system by itself and do the same as above. Then try both the first then ramp the second
OR
Run the first system and add the second .run to the 1/8th mile then recheck it before making a full pass. Kinda forgetful trying to remember
 

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id get the first system dailed in 330 pass then 1/8 then 1/4 if you run that far, and then add second and start over again with second stage 330,1/8,1/4 things change in multi stages second stage might be same as first example , 30n/24f but second might end up 30n/22f or 20f because of motor accel faster and drawing on carbs more
 

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You need to dial the first kit in by itself, then work on adding second kit on top of it and dialing it in.. Thanks, SJ
X2.

Dial in first kit and leave it. Then add second kit on top of it and dial in.
 

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I would test everything individually first (small hits/short distances) if it's a new set up or changes have been made....... Just to make sure "EVERYTHING" works properly on each kit.
After your 100% both kits work correctly, tune the 1st kit to perfection. (have patience.... This is where dividends pay off). THEN work on introducing the 2nd kit on top of your 1st. What are you running for kits? Kit info will help others to point you in a better direction perhaps. As always, the more info you share the better.
 

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Agree with Steve 100% on leaving the first kit as is after tuning separately (agreeing with Steve is usually a pretty safe bet :) even though its likely that when you add a second kit you will want less fuel ( usually will not burn as effectively on two so it needs less fuel) that is not a reason to change your first kit from ideal. Keep the single tune and the plug temps happy on one then when you add the second it will be under ideal circumstances then simply adjust the second kit as needed to achieve the total mixture needed on two.

In my experience if its happy on both separate and you are modest on timing when you add the second you will be close enough (N/F wise) not to have any problems running them as they were separately, then based on what you see then tweak the second (N/F and timing) to achieve max MPH as long as plugs and crankcase vac don't tell you otherwise.
 
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