My buddy is going to put on my old nitrous system on his 1989 mustang lx 5.0 notch. Some people on mustangforums.com are saying that it is a bad idea. The system is a superpowershot 150 shot, nozzle is 67/42, and is made specifically for the 5.0 EFI engine for the mustang. Is this a good idea or a bad idea. I know that if the car has a wet shot sometimes a puddle of gas forms in the intake and can cause a nitrous explosion. So what is the deal and is it a good idea? Should he use a smaller shot like a 100 or 125 shot? By the way, the car is mostly stock except for headers, MAF, cold-air, and a few other bolt-ons.
Well?
Since it's mostly stock, the 1989 pistons are forged but the stock head bolts would be suspect to me. With it being stock 1989 vintage, the bolts could stretch easily, allowing the head to lift and blow the head gasket. I'd suggest backing it down to 125 at the most, 100 preferred. If it was a fresh engine then 150 would be alright. It'd be the limit but it'd be alright.
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Since it's mostly stock, the 1989 pistons are forged but the stock head bolts would be suspect to me. With it being stock 1989 vintage, the bolts could stretch easily, allowing the head to lift and blow the head gasket. I'd suggest backing it down to 125 at the most, 100 preferred. If it was a fresh engine then 150 would be alright. It'd be the limit but it'd be alright.
We have a WOT switch on my car still and we are going to take it off and put it on his. There is a safety feature on the system that bumps up the fuel pressure to 80 psi and wont let the nitrous fire if the fuel psi is under 40 psi. Is there anything else we have to worry about and if we are careful? should we worry about anything you said above?
As long as he doesn't get greedy, and it's easy to do so, he should be alright. That safety feature it has is exactly what he needs, just be careful and it should be alright.
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Something a lot of other people have been saying is that they would spray 150 wet shot but not dry, why is this? Also, why would it be ok for 125 but not for 150, is there really that much of a difference? Also, this system was on my car. Now, my car only has 35,000 miles on it and my buddy has about 125,000 miles. Why didnt anything go wrong on my car? People are also saying that you could spray up to a 250 shot and make 6 passes before anything will go wrong. What is the deal? Also, thank you for all of this info, it is really helping us, other people are not giving us the answers we want.
The 150 is probably alright, I was stating you should back it down as a measure of protection against engine damage. Typically a wet kit will make more usable power than a dry, but it's harder to install (adding the fuel). The dry is easier and has less chance of puddling because of it adding the fuel through the injectors, not through the upper intake.
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Thanks a lot! This is what we have wanted and everyone for some reason on the other sites like to leave responses that dont help us. Thanks again, we will let you know how it goes!
150 shot will last a little while. Just don't rev over 5000 or you will float the valves and could possible drop a valve. Seen it happen a few times when people are greedy. You want to pull some timing, and get at least one step colder plugs. I recommend tuning it on a dyno to make sure it's safe, but that's your choice. Also, you might want to throw a couple gallons of high octane race fuel in there when you spray just for safety.
150 dry shot on 1989 Lx notchback mustang 
