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Car Forum / Nissan / Nissan Maxima / March 2004Performance Mods
Thinking of adding a cold air intake and a aftermarket mass air flow sensor. Anyone have a brand preference of know of the actual HP increase these two will increase on my 2004 3.5 Maxima SE? Thanks in advance Don't bother. A CAI is OK for more low rpm torque but will kill the power at high rpms. A new MAF won't make much difference until you bore and mod the whole intake/exhaust. >Thinking of adding a cold air intake and a aftermarket mass air flow sensor. >Anyone have a brand preference of know of the actual HP increase these two >will increase on my 2004 3.5 Maxima SE? > >Thanks in advance > Don't bother. > A CAI is OK for more low rpm torque but will kill the power at high rpms. A new [quoted text clipped - 5 lines] >> >>Thanks in advance How will a CAI kill power at high RPMs? CD >> Don't bother. >> A CAI is OK for more low rpm torque but will kill the power at high rpms. [quoted text clipped - 8 lines] >> > How will a CAI kill power at high RPMs? If the EFI isn't calibrated/can't deal with the change and leans out. I've seen cars lose over a second 0-60 adding a CIA even though the owner will swear it's faster cause the noise it makes!  SignatureSteve http://www.atlantaracing.com > If the EFI isn't calibrated/can't deal with the change and leans out. I've > seen cars lose over a second 0-60 adding a CIA even though the owner will > swear it's faster cause the noise it makes! I guess that could be true with a car that uses a MAP sensor, but I think it would be unlikely with a MAF sensor, they usually have a bit of head room.. Which is why the supercharger kit for the gen 4 could be used with the factory MAF sensor. Greg. >> If the EFI isn't calibrated/can't deal with the change and leans out. >> I've seen cars lose over a second 0-60 adding a CIA even though the owner [quoted text clipped - 3 lines] > it would be unlikely with a MAF sensor, they usually have a bit of head > room.. True, map sensor cars are the worst. He asked how it could kill top end power, leaning out is how it happens most of the time. SignatureSteve http://www.atlantaracing.com >>>Don't bother. >>>A CAI is OK for more low rpm torque but will kill the power at high rpms. [quoted text clipped - 12 lines] > seen cars lose over a second 0-60 adding a CIA even though the owner will > swear it's faster cause the noise it makes! Yeah, that's possible, but I think slower 0-60 times may be more due to the launch. With the stock intake, air flow is minimal at low vehicle speeds, so the car doesn't really develop its full power. In my 98 SE 5-speed with the stock intake, 1st gear didn't feel all that powerful as I thought it should, but as speed increased, the car seemed to get more powerful in the higher gears. It seems to me that the engineers at Nissan designed the intake to limit flow at low speeds so as to make the car more easily tractable with throttle application. Now, enter the CAI. 1st gear is a monster, I floor the pedal at any rpms in 1st and the wheels spin at will. I have to be very sensitive to throttle at low speeds in 1st gear. As I go higher in the gears, the car is still powerful, but you notice more of a gradual tapering off of power. The stock intake really did a good job of making the car very linear in power delivery, and the CAI just opened things up in my view. Not in a bad way, mind you, you just have to adapt to it. I would think that this situation would apply to the newer maximas as well. The car is more powerful with a CAI, but its power delivery makes it harder to put all that power to the wheels, especially in a FWD configuration. And look, Nissan (and Acura's TL) have probably reached the limit of how much power you can drive throught the front wheels. Both cars suffer from significant torque steer. CD > I would think that this situation would apply to the newer maximas as > well. It could but you asked how it could happen. Doing mods on a car for most of us is a trial and error thing. Sometimes they help, sometimes they hurt. The trick is not being fooled by noise etc into thinking the car is faster. SignatureSteve http://www.atlantaracing.com >>I would think that this situation would apply to the newer maximas as >>well. > > It could but you asked how it could happen. Doing mods on a car for most of > us is a trial and error thing. Sometimes they help, sometimes they hurt. > The trick is not being fooled by noise etc into thinking the car is faster. I wholeheartedly agree with you. That's why I did a dyno to backup what I felt, and it did corroborate. Also, there was a thread on Maxima.org discussing resonators. When you install an intake, most, if not all, of the resonators are removed. By doing so, you tend to hurt mid-range response, but still have better peak hp with an CAI or whatnot. Putting back the resonator has shown to improve mid-range and also change/decrease the sound of an aftermarket intake. So, ideally, an aftermarket intake with the resonators left intact would be the best mod to increase performance throughout the rev band. Also, the modest increase in hp of an intake would follow the theory that the engine is a pump, the more you get in has to matched with the more you get out. An intake increases the air coming in, but you have to finish it off with an exhaust mod to get more exhaust going out. That combination of intake and exhaust will compliment each other very nicely. CD > Thinking of adding a cold air intake and a aftermarket mass air flow sensor. > Anyone have a brand preference of know of the actual HP increase these two > will increase on my 2004 3.5 Maxima SE? > > Thanks in advance Waste of money. You *might* get 5HP at high RPM and a little low end torque out of a CAI, but not enough to even feel it. The aftermarket MAF sensor isn't going to do anything on a stock intake/exhaust system (except increase your odds of related failures). It's a very well designed drivetrain. Relax and enjoy it. |
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