Air Fuel Ratio's on Nitrous,(help)
02-25-2003, 08:51 AM
#1
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Air Fuel Ratio's on Nitrous,(help)
I dynoed recently on the nitrous just to see what kind of power I could make on a stock bottom half motor with just heads and cam.
Then guy who was running the dyno stuck the sniffer in the pipe while I sprayed it. The ratio got as low as 12.8:1 and stayed steady as a rock there. The guy at the dyno said that was great. Is that true? Is that as safe as it should be on a 150 shot?
Thanks,
Jeff
Then guy who was running the dyno stuck the sniffer in the pipe while I sprayed it. The ratio got as low as 12.8:1 and stayed steady as a rock there. The guy at the dyno said that was great. Is that true? Is that as safe as it should be on a 150 shot?
Thanks,
Jeff
02-25-2003, 09:45 AM
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FRDnem,
I have heard of ratios as rich as 9.xx:1 with 400+ hp shots. I'd think that with only a 150 shot, you should be OK, but it wouldn't be a bad idea to richen it a little. Just be careful on your total timing. If you step it up to a bigger shot, I'd recommend going a bit richer. It's always better to start on the rich side.
Just my humble opinion.
Kevin
I have heard of ratios as rich as 9.xx:1 with 400+ hp shots. I'd think that with only a 150 shot, you should be OK, but it wouldn't be a bad idea to richen it a little. Just be careful on your total timing. If you step it up to a bigger shot, I'd recommend going a bit richer. It's always better to start on the rich side.
Just my humble opinion.
Kevin
02-25-2003, 10:22 AM
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If I fatten up the fuel jet (NX kit) will I run a bigger risk of a nitrous backfire?
From what I have heard NX runs their kits on the fat side as it is. The car made 406RWHP 395RWTQ (Standard)
On a 150 shot it only picked up to 522RWHP 550RWTQ.
Thats only a 116 HP & 127 TQ. on a 150hp shot.
I have heard NX rates their kits at the rear wheels.
From what I have heard NX runs their kits on the fat side as it is. The car made 406RWHP 395RWTQ (Standard)
On a 150 shot it only picked up to 522RWHP 550RWTQ.
Thats only a 116 HP & 127 TQ. on a 150hp shot.
I have heard NX rates their kits at the rear wheels.
02-25-2003, 10:38 AM
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Originally posted by FRDnemesis
If I fatten up the fuel jet (NX kit) will I run a bigger risk of a nitrous backfire?
From what I have heard NX runs their kits on the fat side as it is. The car made 406RWHP 395RWTQ (Standard)
On a 150 shot it only picked up to 522RWHP 550RWTQ.
Thats only a 116 HP & 127 TQ. on a 150hp shot. I have heard NX rates their kits at the rear wheels.
If I fatten up the fuel jet (NX kit) will I run a bigger risk of a nitrous backfire?
From what I have heard NX runs their kits on the fat side as it is. The car made 406RWHP 395RWTQ (Standard)
On a 150 shot it only picked up to 522RWHP 550RWTQ.
Thats only a 116 HP & 127 TQ. on a 150hp shot.
I have heard NX rates their kits at the rear wheels.
Rich Krause
02-25-2003, 10:50 AM
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Originally posted by rskrause
They rate them the same as anyone else, by the size of the N2O jets. How much hp a given combo will see has a lot of variables. In my case, a 150hp hp shot got 125rwhp with some timing taken out. So I wouldn't say you are too far off. What was the bottle pressure when you made your run? Nitrous delivery is a function of bottle pressure, as well as jet size.
Rich Krause
They rate them the same as anyone else, by the size of the N2O jets. How much hp a given combo will see has a lot of variables. In my case, a 150hp hp shot got 125rwhp with some timing taken out. So I wouldn't say you are too far off. What was the bottle pressure when you made your run? Nitrous delivery is a function of bottle pressure, as well as jet size.
Rich Krause
Rich,
I had the bottle pressure at about 1,000 - 1,050 psi.
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