nitrous problem

302crew · 03-23-2003, 12:16 AM

Okay i finnaly got my NOS sportsman fogger going i have a holley blue dedicated for just the system when i called nos they said a 26 nos jet and 28 fuel and when i looked on there website there was 22 26 was the jets they gave well i used the ones they gave me and took it out the car pulled harder but not as hard as it should i pulled the plugs and they were white so i figured it to be lean so i used the next set of jets that i had and jeted up the fuel side to 32 ran it again pulled like an animal took the plugs out they were white same as with the other jet and the whole time the fuel pressure was at six and half almost seven the timing is retarted i have colder plugs in it good gas i dont see any detanation on the plugs but they were white not even a little tan white like they are brand new could this be because my carberator might be to lean i cant seem to figure it out any advice or suggestions would be greatly apriciated.

sn95gt19 · 03-23-2003, 12:18 PM

undercarb'd maybe? how big of a shot are you putting through it?
are you sure you got the jetting right on the second try?

red82gt · 03-23-2003, 05:18 PM

How do the plugs look off of the juice? It sounds like you need to jet it up a bit. You're not undercarbed, if your carb was too small it would be constantly rich, not lean, bigger carbs flow more air, not fuel. Other than that everything else is sound.

302crew · 03-23-2003, 08:20 PM

i am not sure what shot im am running because i stepped the fuel up a couple of jets but i was trying for 150 and when i run on motor my plugs are tanish and my egts are around 1450 and now there at 1200 when i spray it

red82gt · 03-28-2003, 02:55 AM

If your EGT is down around 1200 and you haven't melted any plugs than I think you'd be fine. I think you've got a pretty safe tune.

302crew · 03-30-2003, 06:03 PM

even thow my plugs are white

87gt17815 · 04-01-2003, 07:04 PM

I would try running a colder plug at the same tune it is now. If the plug has to high of a heat range the will stay white.

Ron1 · 04-11-2003, 06:34 PM

My guess would be that you may have a fuel volume problem. Jetting it up on the N/A side would compensate, but it may boil down to the size of the lines you have feeding the fuel solenoid. I would also spend $6.00 on a Moroso spring for the Holley Blue that steps up the pressure and volume the pump can deliver. Moroso part number: 65770...and then set your pressure on the N2O side to 6 pounds, and set the Hobbs switch at about 4.5 pounds. Just keep in mind the weight of the fuel, and what that fuel wants to do when you launch...it wants to go back where it came from.
Have you looked the plugs under a magnifier? and which plugs are you looking at?

Ron

03-23-2003, 12:16 AM	#1
302crew Registered Member Join Date: May 1999 Location: sloatsburg Posts: 261	nitrous problem Okay i finnaly got my NOS sportsman fogger going i have a holley blue dedicated for just the system when i called nos they said a 26 nos jet and 28 fuel and when i looked on there website there was 22 26 was the jets they gave well i used the ones they gave me and took it out the car pulled harder but not as hard as it should i pulled the plugs and they were white so i figured it to be lean so i used the next set of jets that i had and jeted up the fuel side to 32 ran it again pulled like an animal took the plugs out they were white same as with the other jet and the whole time the fuel pressure was at six and half almost seven the timing is retarted i have colder plugs in it good gas i dont see any detanation on the plugs but they were white not even a little tan white like they are brand new could this be because my carberator might be to lean i cant seem to figure it out any advice or suggestions would be greatly apriciated. __________________ 306 edelbrock 6037 heads full mac exuast 1.7 rr 373 rear hd clutch tremec mighty demon 650 carb msd ignition rpm air gap intake custom cam still trying to get it to run right

03-23-2003, 12:18 PM	#2
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	undercarb'd maybe? how big of a shot are you putting through it? are you sure you got the jetting right on the second try? __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

03-23-2003, 05:18 PM	#3
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	How do the plugs look off of the juice? It sounds like you need to jet it up a bit. You're not undercarbed, if your carb was too small it would be constantly rich, not lean, bigger carbs flow more air, not fuel. Other than that everything else is sound. __________________ 393W: AFR 205's, hydraulic roller, TKO600.

03-23-2003, 08:20 PM	#4
302crew Registered Member Join Date: May 1999 Location: sloatsburg Posts: 261	i am not sure what shot im am running because i stepped the fuel up a couple of jets but i was trying for 150 and when i run on motor my plugs are tanish and my egts are around 1450 and now there at 1200 when i spray it __________________ 306 edelbrock 6037 heads full mac exuast 1.7 rr 373 rear hd clutch tremec mighty demon 650 carb msd ignition rpm air gap intake custom cam still trying to get it to run right

03-30-2003, 06:03 PM	#6
302crew Registered Member Join Date: May 1999 Location: sloatsburg Posts: 261	even thow my plugs are white __________________ 306 edelbrock 6037 heads full mac exuast 1.7 rr 373 rear hd clutch tremec mighty demon 650 carb msd ignition rpm air gap intake custom cam still trying to get it to run right

03-28-2003, 02:55 AM	#5
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	If your EGT is down around 1200 and you haven't melted any plugs than I think you'd be fine. I think you've got a pretty safe tune.

04-01-2003, 07:04 PM	#7
87gt17815 Registered Member Join Date: Aug 2002 Location: Bloomsburg,PA Posts: 34	I would try running a colder plug at the same tune it is now. If the plug has to high of a heat range the will stay white.

04-11-2003, 06:34 PM	#8
Ron1 Registered Member Join Date: Sep 1999 Location: Vancouver, WA USA Posts: 439	My guess would be that you may have a fuel volume problem. Jetting it up on the N/A side would compensate, but it may boil down to the size of the lines you have feeding the fuel solenoid. I would also spend $6.00 on a Moroso spring for the Holley Blue that steps up the pressure and volume the pump can deliver. Moroso part number: 65770...and then set your pressure on the N2O side to 6 pounds, and set the Hobbs switch at about 4.5 pounds. Just keep in mind the weight of the fuel, and what that fuel wants to do when you launch...it wants to go back where it came from. Have you looked the plugs under a magnifier? and which plugs are you looking at? Ron __________________ 65 Mustang Fastback 347 Stroker, C4 with 4.56 10.68 @ 122 N/A 9.74 @ 137 w/ N2O www.fastspecialties.com Last edited by Ron1; 04-11-2003 at 06:39 PM..

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