Ok if you had to pick one.... which would produce the best overall results? engine like durability, performance ect...

1 Ported engine with 150shot nos
2 greddy turbo and lightend flywheel.

 

1. A ported engine will typically gain some power somewhere at the expense of power in other areas. A 150 hp shot, if you can make it last, will be faster than any current turbo system out there. The problem is that it will run into the same fuel availability issues that forced induction will run into. When the nitrous runs out, you're slow again. It also is only being used at or very near full throttle. This means that at other throttle levels, you aren't gaining anything.

2. The Greddy turbo as we all know isn't going to give you 150 hp worth of more power. Good luck getting that with nitrous on this car though. The good news is that it will give you a nice gain across the board everywhere and it will do it at many different throttle levels. Not only full throttle. Half throttle off the line is much faster than half throttle off the line in a nonturbo car. A turbo will give you more fun than stock just driving around everyday. Nitrous will give you more fun than stock only at full throttle. A lightened flywheel will make your car rev faster and this too is fun.

Performance:
1. Nitrous: Full throttle only for short bursts. When you're out, you're out. Time for a refill. Nitrous is a cheap short term gain but a more expensive long term gain. You pay little up front but keep paying over the life of the system.
2. Turbo: Nice power gain everywhere in the rpm range. It is also a nice gain at lower throttle levels ad not just full throttle. It won't run out when you want it the most. Turbos are more expensive up front but their expense stops there if that's all you want done. You don't pay to have your boost refilled every week or so.

Durability: This is entirely dependent on the user. Both can be reliable and both can be problematic. It all depends on how well it is set up and how hard you are on the car.

 

what about a turbo with a 50 shot how will the engine last in long term for that?
thanks rotarygod. always can depend on you for a well written answer!

 

Do a search. We have a guy by the name of Charles Hill that is running both. There are hundreds of posts by him and others as he was putting the systems on his car. A lot of the answers you seek are covered in his threads and posts.

 

Running both nitrous and a turbo is still just a matter of tuning it properly. Personally I would use either one or the other but that's just an opinion. It can definitely be done.

 

I plan on using both so as to not rely on too much of either one. Greater bling factor, too. As far as lifetime costs go, I have calculated that one would have to do 4,000(+/) drag strip passes in order for a $700 nitrous system to be on financial par with a $6,000-$7,000(all-in) turbo kit. Don't forget that with turbos there are situations in which you may be burning extra fuel and making power when you don't really need to. That's one thing I like about nitrous, no power until I really want it. One thing I like about turbos is the low-end boost offered by a well-tuned system. However, it should be noted that not much happens below 4K rpms with the Renesis, anyway. With that in mind, the practical use of a nitrous system on the Renesis actually mimics that of a turbo(at least from what I have read and seen on the video offered on this site). The Renny is actually pretty docile up until 6K. Above that all Hell breaks loose. In my experience a nitrous system tends to magnify the torque curve already exhibited by the engine. It really is a matter of personal preference. There is one opinion from which I refuse to be shaken and that is that even though the RX-8 is pretty tame, power-wise, from the factory it is very responsive to the right mods and becomes fairly quick with very little cash outlay. If you prefer to road race or autocross, to get into the low to mid 13 1/4 mile times is all you need to keep up. If you like to drag race it will be a bit more difficult but not impossible. It just depends on other factors.

CRH