370Z K&N Dual Air Filter

Robert_Nash

Not trying to step on anybody's toes here...I'm just relaying what I've been told by people who are in a position to at least have an intelligent opinion on the subject.

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Robert
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dawankler

If the stock intake and exhaust are adequate for all of the engine's needs how did the Nissan engineers increase the HP/TQ of the Nismo 370 just by replacing the intake and exhaust?

Engineering is a careful balance of a number of factors. In this case with the intake/exhaust design of the stock 370 those factors include price, power, efficiency, exhaust note, emissions standards, and probably 20 others that I'm not thinking of. It's not outside the realm of possibility to believe that engineers sacrificed some power numbers in order to meet one of the other factors. For end users who are willing to sacrifice general publicly acceptable exhaust note, price or efficiency for those extra ponies can find it in these aftermarket mods.

With that said, I agree with Josh. I think Nissan hit it out of the park with the 370. It's got everything your average person would want in a two seat performance vehicle at a price that your average person can afford.

Robert_Nash

Even if I asked; they very likely wouldn't tell me.

Even if they told me, I probably wouldn't be allowed to tell anyone else.

If I did tell anyone else I'd probably (and appropriately) be fired.

So I think it best I shut up now.

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Robert
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2bits

I think the confusion is stemming from airflow vs charge temp. The opinion you cited only addressed airflow. While stock airflow may be adequate, it's drawing hot engine compartment air. The only intake which has showed significant improvement so far (Stillen G3) moves induction in front of the radiator, outside the engine compartment entirely.

It's not really about intake airflow for the 370z, so it misses the point.

Modshack

Incorrect. The stock system is sealed to the thru ports at the Radiator support. ALL air is ingested from outside the engine bay, just like the Stillens. IAT (intake air temps) run only 8-10 degrees higher than ambient at steady cruise, so the Stock box is pretty well designed to start with..

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2bits

Cool, I stand corrected. However, I'm a bit puzzled at the G3's success now.

Modshack

I can't speak for Stillen, but from what I've read they've done a fair amount of research into the long tube design. There's some increased (very smooth) flow, Lottsa filtration area, and relatively cool air from in front of the radiator. In addition, the MAF signal is probably altered slightly as the tube ID's are slightly different than stock, resulting in a slight leaning and more power. There are lots of factors, one of which is that most Dynos seem to have been done with the nose off. which enhances the end result some. I've been building airboxes for Audi's for 8 years now so I've got a little experience messing with them. Some of it's science, some of it's luck, some of it's a sympatico relationship between engine designs and the CAI's that work well on them..

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Robert_Nash

Yes...that that the air is taken as you describe is one of the reasons cited to me as to why intake systems, at least generally, don't give much benefit in the 350/370.

Thanks for stating it so clearly!

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Robert
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