On my auto, I seem to have a 'flat spot' between 2500-3000. The car keeps accelerating, but it seems sluggish. Then when it gets to about 3000, the power seems to come in and at 3500, it really starts moving. I was hoping that this was due to the lack of maintenance (this is the one that had a 9 year old air filter) but, the car does run great, generally speaking, but I'm still conscious of this seeming 'dead zone'. I don't notice this if I do a standing start and keep it to the metal. Just in 'normal' (haha) driving. Is this just a 'feature' of the auto?

 

This happens with all maximas that have the stock USIM, it's just more apparent with autos. It's due to the way the stock intake manifold is resonance-tuned. The dip shows up on dyno's as well.

 

If its REALLY bad its possible the MAF needs to be cleaned or replaced.

 

It's not terrible, just that I had hoped it was going to go away after doing the maintenance. The TB and MAF are both clean now. Thanks for the info.

 

Guess my post meant nothing...

 

Lol, i listened nismology. Yeah that dead spot kinda sucks. It come back too at like 5500.

 

That's interesting. It implies the problem really IS due to pipe resonance, because 5500/2 = 2750. Sounds like fundamental resonance, and the spot at 5500 would be the second harmonic. Otherwise known as organ pipe effect. Now I know why people fit variable intakes

 

00vi here we come ;]

 

this site will not let me do a darn thing.



EDIT: I'm figuring it out.

 

i understand that!!! but i wouldnt had i not been musically inclined my whole life.
anyone know if this problem is evident in the 3.5 as well?
sometimes when i'm driving i ease into 3000 then i really start opening up the throttle and it feels amazing...its like im tricking myself to thinking that if i just floored it in any point of the rpm band it would produce that much of a kick, you know what im sayin?

 

Then GTFO..

Have you ever seen a dyno of one before?

 

the answer is no

 

Absolutely. I checked out the dyno curves comparing the OOVI with the standard intake and yes, you can see this 'dip' quite clearly. (VQ30)
The difference from 3000 on is very noticeable but the 3500 RPM point seems, to me, to be where the power really starts coming in very strongly.
Another thing, too; I've seen people complaining in the forum about the Max running out of breath past 5500 or so. I certainly don't have that impression. All the way to 6500, which is when the transmission shifts, I find the power is really strong. (No, I am not going to manually hold it in gear just for an extra 500 rpm before the red line! I'd like a manual car but such are hard to come by, this side of the border)

 

Weird mine shifts at lik 6000-6200... I had a MEVI on but took it off to do some work on it. And there is a noticeable loss up high. The car does go, but it starts to feel like alot of wind resistance or something up high. I don't know what other cars you have owned, but my previous car begged to rev out stock. The max seems to like the mid range better then anything.

 

its 00vi, for 2000 variable intake.
and i cant find the how to they used to have on how to install them.

 

Put on either a MEVI or a 00VI and you will change that viewpoint. I never thought there could be more powere past 5500 since with the USIM it didnt really feel that bad. But trust me, when that MEVI opens up its like a kick and you no longer have to "wait" for redline...its just there.

Then add boost and its totally amazing beyond your imagination ..lol

-matt