My Carb & spray Setup....Help

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Sep 15, 2011 | 02:30 PM

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Ravenous T\A

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TECH Junkie

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From: Burleson/Ftw,Texas

My Carb & spray Setup....Help

Ok im using a progressive Harris controller and my 1st spray I wanna ramp upto a 150 shot (flywheel, not sure which the manf use?) Gonna lock out 1st gear until im use to it. Also i'm using Br7ef's. How much timing should I pull? 6degree's? Never done this, last car had my tuner for my PCM do all this. I just wanna validate this is correct? Gonna try a .058/.052 jets for Bottle Psi of 950 with fuel pressue @ 6.5......good so far?

Sep 15, 2011 | 04:37 PM

Nitro Dave's Nitrous Outlet

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58-52 I sprobably flywheel ratings.

Pull 6 degrees starting out.

Dave

Sep 15, 2011 | 04:46 PM

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Ravenous T\A

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TECH Junkie

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should I pull more timing for pump gas? 92-93 rated. Looks like I gotta buy some extra plugs so I can do a plug reading too according to another member.

Sep 15, 2011 | 05:39 PM

Nitro Dave's Nitrous Outlet

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It would not hurt to start with pulling 8 and look at the plugs as you add some back if needed.
Dave

Sep 16, 2011 | 12:18 PM

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Ravenous T\A

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Ok now I have a new problem

I have been looking at 2 different N20 calculators to figure out the n20/fuel jet sizes, my guy who is doing the install runs NOS system on his race car so he keeps using his NOS chart he has which is far different from the figures I am getting. Lemme brake down my set up so u all have all the info

Cold Fusion Single bar spray plate
Harris N20 & Fuel Noids
Dyno Tune jets
6.5 psi fuel pressure using a Holley Blue through a Aeromotive reg

This is what the Calculators are giving me
Horsepower FW / RW
.054/.049 – 130/110
.058/.052 – 150/130
.061/.055 – 170/140
.062/.056 – 175/150
.063/.057 – 180/150
.064/.058 – 185/160
.066/.060 – 200/170
.067/.061 – 200/170
.068/.061 – 210/180
.070/.063 – 220/190

This is what NOS says (Cheater System)
.047/.053 - 100shot
.055/.061 - 125shot
.073/.082 - 150shot
.082/.091 - 175shot
.093/.102 - 200shot

So now im at an impass on which jets to run, I ordered my jets using the online calculators. So one should I be looking at the Rear wheel figures? Second it looks like the NOS run alot richer compared to the Dynotune jets?

Sep 16, 2011 | 05:26 PM

Nitro Dave's Nitrous Outlet

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Quote:

Originally Posted by Ravenous T\A

Ok now I have a new problem

Ouch.. No Nitrous Outlet parts but Look who is here to give you tech help...

The online jet calculators are nothing more than a formula to generate a close starting point in the tune up. This is were widebands and reading spark plugs come in.

I would use what ever jetting cold fusion sends with there plate as a starting point on the tune up since its there plate.

None of these tune ups are the deffinate jetting. They are just starting points.

Dave