Just because a Nissan engineer designed the part doesn't make it perfect. They have to consider all sorts of matters such as sound, airflow, cost of the part, reliablity, etc. Nissan is not focused purely on performance, especially not on this car.

Someone brought up an idea in another thread about moving the power duct (i think that's what it's referred to as) further down as with the hood shut it hardly gets any airflow whatsoever. Something you might want to look into.

This weekend I hope to do something similar and make it breath a bit better and fabricate a new heat shield because this JWT one isn't doing it for me.

 

actually i just sealed up the airbox, so the air doesn't go down into the silencer part. it sure did make a difference in sound.

 

[rant]The more I read you're posts the less I think about them!!!! Stick to lights!!! Heat soak Heat soak Heat soak Carmon guys give your heads a shake. I posted before the effects of heat on our engines. At worst you'd lose about 2 to HP THATS IT!!!!!!!!!!! Can you feel 2-HP??? Will it decrease your 1/4 time? I think not!!! Heat shield or no heat shield, once you close that hood you get what's under there regardless. I don't think the heat knows to stay away because of the shield (Oh no..... we can't go there..... see that shield?). The amount of time the air travels through your intake, I doubt it has time to change temp. I understand want you guys want but it's probably all in vain. Later when I have some time I'll see if I can do a few test to prove to you. I will post results. I'm glad people here are trying new things but let heatsoak go please![/rant]

 

I have to agree. Heatshields are a joke. It's the air that's the concern. If the air is hot, then power is going to go down. Also, the LAST thing you want in an intake is metal piping. Metal piping warms up and retains heat far better than plastic. The hot intake piping can heat up the air fractionally. Has for Injen/AEM CAIs, they're bad news. The air isn't following in that portion of the bumper therefore the chances are greater that the air is hot since the radiator is in close proximity. Also, the additional 12-14" in intake length is no good.

 

0.5 * rho * v^2

where rho = air density
Dynamic pressure at standard sea level atmosphere:
Dynamic Press Dynamic Pressure
kts mph ft/sec (lb/ft^2) (psi)
10 11.52 16.89 0.339063505 0.002354608
20 23.03 33.78 1.35625402 0.009418431
30 34.55 50.67 3.051571546 0.021191469
40 46.07 67.56 5.425016081 0.037673723
50 57.58 84.45 8.476587627 0.058865192
60 69.1 101.34 12.20628618 0.084765876
70 80.62 118.24 16.61411175 0.115375776
80 92.13 135.13 21.70006432 0.150694891
90 103.65 152.02 27.46414391 0.190723222
100 115.16 168.91 33.90635051 0.235460767
110 126.68 185.8 41.02668411 0.284907529
120 138.2 202.69 48.82514473 0.339063505
130 149.71 219.58 57.30173236 0.397928697
140 161.23 236.47 66.456447 0.461503104
150 172.75 253.36 76.28928864 0.529786727

As you see from above: 150 mph could generate 0.4 psi IF everything was PERFECT........unlikely without a windtunnel. Unfortunately 1 - 90 degree bend will reduce that to ZERO.

Each 1.0 psi =6.8% boost so at best 2.72% at 150 mph, at 103 mph 0.19 x 6.8= 1.292% say 1% if you are extremely lucky.

Years ago I measured my 90Q45 [one of the worst convoluted QUIET system known on earth looks very restrictive] HOWEVER at 120 mph the system became transparent [pressurewise in front of MAF] ZERO loss thru silencing and air filter by 155 mph I actually had 4.0" W.C. of positive pressure ---------a 1% BOOST.

 

Your argument will fall on death ears. No one wants to hear that the stock intake is actually an excellent design. They are convinced by the aftermarket that the stock intake is a restrictive piece.

BTW, I totally agree with you on this and I've preached this very thing since I became a member.

 

I do, that's why I haven't put so called "Cold air intake'' on, although
for such small cost, I would jump on it if a solid 2hp could be shown.
I don't believe the dynos that show hp gain of 2-5 hp, because it's within
error bar range.

However, it doesn't mean the OEM intake could not be improved,
2007 Sedan supposed to come with an improved RAM air design that
give a few more HP. can't wait to see what does it look like or it's just BS.

 

It's really not the "intake" that's been improved on the 07 G, it's the entire system. Dual throttle bodies, dual intake boxes, and a completely different intake manifold will make all the difference. Seeing that this engine has a 7,500rpm limiter, it suggests to me that the motor can move a ton more air hence the reason for all the extra induction work. Put system like this on a 06 or older Vq35 is pointless because the block, heads, cams, etc can neither flow the air nor handle the rpm load safely. This new VQ35 is going to be a completely different animal.

 

i don't think it will be super effective. i feel it will yield more problems for you.