I'm planning on getting intakes for my 2011 g37x coupe. I want performance gains and some sound gains as well, my g37 is my dd and i drive a lot, so i was wondering if these are the best intakes for me? All the older posts say they are, just wondering if these are still one of the top intakes for the g37

 

Nope. A short ram intake is no good. You're better off doing drop in k&n's and post tubes. That or a cai like stillen.

 

why do you say short rams are no good ? in terms of gain or just over all bad for the motor ?

i have short rams they seem ok to me ?

 

They won't damage anything, but there isn't a short ram design in existence that completely avoids pulling hot air from the engine bay. Given the high-temp nature of the VQ motor to begin with, you're pulling VERY hot air from the engine bay.

Physics says that hot air = less dense air = less mass flow = less fuel per given air/fuel ratio = less power

Definitely won't damage anything, but my tuner claims they are harder to tune, and my dyno experience (first with K&N, then again with Gen 3's) indicates he's right.

 

The R2C intakes are fine. You won't feel any noticeable HP increase. It will change the intake sound at high rpms and look nice under the hood. It also has a heat shield that isolates it from the rest of the engine bay, so you will not be pulling as much hot air as an open element intake. For the money, it's really not worth it performance-wise. It's really for aesthetics, unless you plan on doing a full exhaust and a tune, then it may help.

 

My only concern are the short ram intakes losing power compared to stock.

If they can at least keep same power as OEM and just be a sound/ looks upgrade I would say it's worth it

I really wonder if even with the heat shields the r2c/injen/k/&n are losing power or not.

I also wonder if once the car gets moving at which point the hot air is negated maybe they suck in more cold air than stock making more power at the mid- high Rpms...

 

If you've ever removed your stock air boxes, you've seen how small the actual air "intake" holes are (very). I think any "ram air" effects are negligible, since the air would have to take a couple of 90 degree turns before it gets into the filter.

I wouldn't be surprised if you end up losing power with SRI's, particularly the metal ones, since they're more prone to heat soak than the OEM rubber.

 

Yea my friend was telling me that he uses a short ram intake that only has very short metal piping combined with stock silicone hps tubes that replace the stock rubber tubing, and they are also straight tube design. In addition it also has a decent heat shield. Here is a shot He thinks they improve but I'm still asking.

These are the injen Sri intakes combined with hps tubes. They are similar in design to the r2c it seems.

 

Why waste your money and not just do it right the first time?

 

Power loss. They get to hot being exposed to the motors heat. The stock air box is way better of a design and is fully enclosed. A drop in filter with post tubes have just as much power increase with less chance of heat soak killing your timing. The stock box also has that intake sealed off around the radiator support to block off engine bay heat and to the other side of the radiator support bringing in a ram air affect.

 

If you really want the best of both worlds (price and power) make your own...

Using all silicone does two things, 1. Its 2.5" ID vs stillen that's 2.5" OD and 2.33" ID so you have more volume. 2. Silicone doesn't get hot like the stillen

Check out my build thread, I make everything!

DIY cai? - Nissan 370Z Forum

http://www.the370z.com/members-370z-...ort-build.html

 

The R2C does add horsepower and torque throughout the rev range. There are plenty of threads on here supporting this. The Stillen Gen 3 adds more HP but at the top of the rev range. I don't redline mine very often so the R2C was a better fit. Plus the R2C filters protect the engine a lot better than the oiled gauze filters.