Originally posted by Jason Weaver:
David, What would you reccomend to use to increase fuel pressure? I know B&M offers an application. (adjustable pressure riser) I think NOS offers one as well. Do you know anything about these 2 good or bad? What would you think would be the max for a safe dry shot w/the correct increased pressure? 100? Thanks for your opinion.
The max safe dry shot depends on how involved you want to get with the fuel system. As a general rule, I would not exceed 100hp with a motor like the NSXs. However, Brent has heavily modified his fuel system and runs a 150 dry shot. Obviously the 70 shot RM uses has been pretty reliable. I would think 100 would work as well, as several people are running that much with dry shots. You can change the amount by swapping out the pills (easy, 5 min), so it is prudent to start safe (70) and gradually work your way up. You can spend $45 or so and do a dyno pull with the larger shot and use a sniffer to see if it is getting lean. Safe way to work up to a bigger shot. Just show up with three or four pills and do several pulls.
There are several ways to increase the fuel pressure. You can have a secondary pump tied into the NOS circuit. You can use a boost-a-pumb type device like the CT blower kit uses or you can upgrade your fuel pump. There are several performance Honda-type in-tank pumps available and I would bet at least one of them works with the NSX. What you want to avoid is getting a condition that results in your motor running rich when the NOS is off.
By the way, there are several brands of fuel pressure regulators that are good - CT, Paxton, NOS, AEM, etc. I use a Paxton on my car.
It really isn't that hard to do a single nozzle wet shot, however. And, it is safer. Cost would probably only be $100 more. Installation might take an extra hour.
By the way the NOS tech line is 714-546-0592. They are there to serve.
Good luck, and, as always, feel free to ask any more Qs.