Nismo CIA (spec v)

[ProZach626]

I'm reading an article on the nismo r-tune CIA and it says it produces 8.7 hp at the wheels and 10.4 lb-ft tourqe peek at the wheels? That sounds like a pretty good gain, not too bad for $240. Any better cia's out there? And does this kind of gain sound right? I didn't think CIA's did that much.

[nissanstreetz]

No from what I know hotshot makes the best cold air intakes for nissans I'm not sure what the horsepower gains are but it's basically been proven. What kind of car is it

[fugiot]

Yeah, Nismo is probably as good as it gets, but AEM or Injen CAI's will probably net the same results. 9whp isn't unbelievable. I've seen an AEM cai make 22whp+ on a K20A. But that's a different story. Nissan engines show minimal gains(as compared to newer i-Vtec honda motors) from airflow mods.

Here's the thing:

Stock Honda = just-enough engine power; complete optimization on supporting parts.(ie. pullies, clutch, flywheel, ecu)

Stock Nissan = overkill on the engine power; cheap out on supporting parts.

Therefore, it's best to work on pretty much everything BUT the engine first. Which is actually why I prefer Nissans over any other make, as far as modding goes. This is also why many Hondas with equal or higher HP ratings get better gas mileage(less wasted power). Also, why Nissan's gas mileage is so easy to improve.

[ProZach626]

Originally Posted by fugiot

Yeah, Nismo is probably as good as it gets, but AEM or Injen CAI's will probably net the same results. 9whp isn't unbelievable. I've seen an AEM cai make 22whp+ on a K20A. But that's a different story. Nissan engines show minimal gains(as compared to newer i-Vtec honda motors) from airflow mods.

Here's the thing:

Stock Honda = just-enough engine power; complete optimization on supporting parts.(ie. pullies, clutch, flywheel, ecu)

Stock Nissan = overkill on the engine power; cheap out on supporting parts.

Therefore, it's best to work on pretty much everything BUT the engine first. Which is actually why I prefer Nissans over any other make, as far as modding goes. This is also why many Hondas with equal or higher HP ratings get better gas mileage(less wasted power). Also, why Nissan's gas mileage is so easy to improve.

I drive an 03 spec v, nissanstreetz. But fugiot, whill the cia help me on my gas mileage gains significantly? In other words do you think I will notice a difference? Also, what are some other things I can do to help my mpg. High flow muffler, right?

[nissanstreetz]

yeah it helps your gas mileage but I don't think you'll really notice the difference I really didn't..... you can put on a new exhaust system and muffler that helps and I'm not sure but I think UR pulleys help to I'm not sure though so don't quote me on that

[slideways...]

underdrive pullys help but LEARN ABOUT THEM before you just stick em on because they DO have downsides.
intake and exhaust should give your car a couple more mpg than stock, but not a ton

[nissanstreetz]

actually I've read alot about the UR racing pulleys and I have them on my car and they respond really well in sentra's they have no downside to them like most cars. For 140 bucks they give 4-5 wheel horsepower and it makes your car rev alot easier and it runs alot smoother at high speeds

[fugiot]

The pullies will have a more dramatic effect on both gas mileage and power than either the CAI or cat-back alone. The key to unlocking Nissan power is to get rid of as much rotational mass as possible. So grab yourself some UR pullies, a UR(or Fidanza) flywheel, and some lightweight rims like Kosei's or SSR's. An ECU will help a bunch too.

[slideways...]

but dont underdrive your alternator if you have a big sound system cuz youll go thru batteries quickly
and dont underdrive your water pump if your car runs a little hot already(such as an rx-7, but thats not what u have) because it will overheat every time you drive it hard
power steering pulley has really no drawbacks, and a well made crank pulley has no drawbacks either.


those were some examples of downsides to UR pulleys that i was talking about
basically if you change the rotating diameter of any accessory it will cause that accesory to run slower than normal, thus causing not as much coolant pumping and your alternator wont charge as well.

but an upside is that on an allmotor SR, the water pump tends to cavitate and froth up the coolant at high rpm so it can be good, just make sure you wont overheat the car(i.e. nismo 149degree radiator cap, larger radiator, dual H.O. electric fans, ect.)

[fugiot]

I don't think UR pullies are any different in size/diameter than the OEM ones. They're just much, much lighter.

[nissanstreetz]

no they are smaller too and alot lighter i think 1/3 of the gains are just from weight alone

[fugiot]

I'm not 100% sure, but I'm still gonna have to disagree. I don't think UR would take the risk of changing the operating characteristics of the pullies just for an extra horse or two.

[nismo_pilot]

90% of the gains from UR pullies on a spec v are derived from weight reduction on the crank, the other 10% or so is from very, very slight underdriving

[ProZach626]

lol... how do you change pullies? Are they hard? Are they expensive?

[nissanstreetz]

pullies are about 150 bucks give or take and as far as puttin them on me and my 2 friends did it and it wasn't the easiest thingi n the world but we did it. We almost broke his whoe engine doing it though but we did it and I wouldn't consider myself a mechanic so as long as your careful but make sure you at least kind of know what your doing