Question about stepping up the nitrous...

revhead347 said:

If you are stepping up to a 150 shot, I recommend having a fuel pressure gauge. You need about 95psi. At that shot, the fuel pressure safety switch becomes useless, because it maxes out at 60psi. If the fuel pressure drops back down to 60 psi before the nitrous turns off, it's already running way to lean. My honest opinion is that you will have enough fuel with the 255lph in tank pump, and your setup. Instead of going right out and buying a fuel pump, I would spend the money on the fuel pressure gauge instead. You need to change the jets up to 150 jets. I would start by backing out the base timing 8 degrees, and run a jet about 2 sizes smaller than recommended on the bypass for starters. Until you can get it on the dyno with a wideband, better to go on the safe side. You're also going to need the regulator shim. Bring down the gap on the plugs a bit too. I would start out with about .035" on the plug gap. Other than that, you shouldn't have to chagne anything else.

When you get on the spray, make sure the fuel pressure spikes and stays there. It will usually jump right up to the correct pressure, even if the pump is undersized. If the fuel system is inadequate, the fuel pressure will start to drop off. Obviously, if it starts to drop off, then you need to let out of it.

Kurt

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