Is it really worth putting a Cold Air Intake on 370z and what HP gains

alcheng

Just have a quick question, anyone with the CAI installed can tell how it effects the mpg?

Mt Tam I am

Should not effect MPG except, they sound so cool that you may start wasting gas just to hear the engine note.

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Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber

alcheng

I have the K&N drop-in, I found it pulls a bit quicker and smoother especially 4k and up, but I also notice it drains a bit more gas, not much, just want to see how is the CAI, gonna get the short one from K&N soon.

gsxr750

if it devlopes more hp than it should get better gas mileage, with more efficient combustion comes better fuel economy. On the older 1980's cars, when you allowed the engine to breath better thru the intake and the exhaust, you usually got better mpg, HP, and 1/4 mile times. This usually meant removing the Cats and resonator on the exhaust, as they really really rob you of power.

kenchan

usually it would be on the leaner side until ecu compensates so you would get better mpg... but on the Z i couldn't tell when i had the R2C on. right now im on stock box KN drop-ins and HPS tubes.

on the G consistent 2-3mpg improvement tank to tank. heck, when i put the stock intake box on mpg dramatically dropped to about 15-16mpg on surface roads.

Speedy

Having just bought a Z I've been looking over the forum to see what you guys have found that works. This is a pretty good thread.

One thing to consider is the Z is a MAF based system. It can and will adjust to bolt on mods without a tune. That's why you guys see 20HP gains with CBE or CAI. It is true that it's not cumulative. You may see 18HP from the cat back, or the CAI by itself, but if you add one to the other you won't see 36HP gains. I'd wager 5-10 more only.

My Challenger is MAP based. That means it does NOT adjust for mods. I did in depth testing on that car, and dyno'd it bone stock, bolts on a cat back as it sat on the dyno, dyno'd that, then added a CAI, and dyno'd that. It gained about 12HP TOTAL. The AFR never changed much however. The CAI looked great though.



I later built the motor and added a supercharger. I dyno'd that with the stock air box, then again with a modified CAI to fit. It picked up 30HP and needed a tune tweak to add fuel.



I went all out on this Challenger and it's scary fast. For the Z I just want a peppy daily driver and it's been a fun car the past 600 miles.

I've been eyeballing the FI CBE, and looks like going with some drop in filters and air tubes is the best bang for the buck on the intake side.

My goal is to hit 12s in the car at the drag strip eventually without too much money tied up in it.

My car came with a CPO 100K warranty. How is Nissan with cat backs and CAIs regarding that? Dodge like to void everybody's warranty at the drop of a hat. Not like I cared on that car, but on my Z I do since it's my DD.