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I've been working on a pretty heavily customized XJ750 (re-built w/ a Hossack front end, among other mods) that, for various reasons (mostly shits and giggles and the fun of further customizing an already mad-science type vehicle) I'd like to get ~100hp out of. Stock, it made about 75hp, so that seems do-able without to much fuss via a n20 system, yes?
Correct and more.
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After a fair bit of research, I like design concepts behind the pulsoid valves a lot, although I wish maybe there was a smaller one that pulled less than 10 amps... is such a thing available / sensible?
We could make you some specials that would work at that level.
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The bike has CV carbs, which (I assume) means I need to run a wet system.
Yes
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That means I'd need a fuel pump, yes?
No as most of our bike customers run gravity fed fuel to the nitrous system.
Instead of a fuel pump, what about packing a propane tank alongside the nitrous? I'm thinking the typical camping stove size, which means it would discharge gaseous propane, not liquid, probably at ~25psi. Not sure how I'd figure out how much flow I need (maybe use a scale and see what size jets / pressures give what flow rates in terms og grams / minute, and find the gasoline equivalent). That's an option and one we were just getting geared up to try out, so if you'd like to become our guinea pig, I'd be happy to work out some arrangement with you if you're able to get to our HQ.
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Also not sure the pulsoid fuel valve would handle gaseous propane, and if so, if it would flow enough of it, given the lower density. If gasoline can be used without a fuel pump, that's probably a better option, although the added octane from propane is (in theory) a nice bonus.
The Pulsoid shouldn't be a problem and the octane would be beneficial but gravity fuel would be simpler.
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Also wondering, is it a good / bad idea to inject the nitrous & fuel downsteam of a CV carb? I'm figuring this would give quicker response, but runs the risk that you can't close the throttle and block off the flow of N20 (in a mechanical sense - there would be a sensor that prevented the valve from opening at part throttle). If its not a bad idea, its very appealing in this case, because the XJ series heads have a head design (called "YICS") that would make it rather easy to pipe n20 and fuel directly into the intake tract, bypassing (and avoiding any alterations to) the carbs & carb boots.
That's how we normally do it (inject downstream of the carbs) on most street type bikes, so not a problem and simpler than you're envisaging.