The sucking, whistling, hissing sound (or whatever you want to call it) is part of normal operation. Mine does it, Stillen does it, JWT does it.

 

I guess my question got lost... let's try again.
Bryan,
which K&N filter do you use and does it have a velocity stack ( and does it really matter) ?

 

At the following thread http://forums.maxima.org/showthread....threadid=95767 I list numerous dyno runs that I did on my 2k2 this past Saturday. I have the Frankencar intake on my car. The guy that runs the shop wanted to try and run my intake with a larger air filter saying that it will definitely improve the power. He went out to his Lexus GS400, removed his Rod Millen filter adapter and the larger K&N filter.

The run with the larger filter (about 20% larger, by estimate) is here http://www.cenpipe.com/~akrusvar/maxima/run4sae.jpg

The run with the original filter provided with the FC intake is here http://www.cenpipe.com/~akrusvar/maxima/run5sae.jpg

There is a 2hp gain going to the larger intake with no loss discernable between the two. The ECU on both runs does not have enough time to compensate for the changes needed to the fuel mapping. The first run I did shows my FC intake on the car for nearly a week. Find it here http://www.cenpipe.com/~akrusvar/maxima/run2sae.jpg Notice the dramatic difference once the ECU has tried to figure things out? I really think the 2k2 would benefit from a proper tuning of the ECU. I think it's doing something weird when trying to compensate. Maybe still trying to optimize fuel mileage?

In the end is the 2 hp gain worth it? I'm not sure. I will play around with it more this spring. It did sound louder and a bit deeper with the larger filter. What may be more critical is the length of the intake tube itself. Longer, shorter? Wider, narrower? They all might change the hp somewhat.

Albert

 

Albert,

Congrats on those numbers, they look good but I would take them with a gain of salt. Namely because of the lack of multiple runs. When performing mods you should do three runs per variable change. But in your case it would be difficult because of the multitude of products you tested and the limited amount of time.

The thing is about filter selection is that it is not crucial to intake design. They may make differences, but marginal ones at that. Right now I'm looking into using a different filter as well but I am skeptical in the effectivness of a larger filter. Sooner or later, we'll get to the bottom of this.......

 

Sorry about that. Currently I'm using K&N part # RU-2820 and it is a standard cone filter. For the same price I'm offering the new S&B filters (manufactured as the brand Reemay) that do have the molded velocity stack in it's flange and the inverted cone filter insert. They use a synthetic cloth material and blue oil.

As far as flow goes, they both will flow approximately the same.

 

I plan on doing a more thorough dyno this spring, when there isn't a whole pile of cars running. I do feel that the numbers are consistent. What do you do when taking 3 runs? Just average or take the lowest value? How can you be sure that 3 runs is the proper number to do? I don't know enough about how long the ECU takes to calibrate before being 'stable'. Maybe it's 5 minutes, or maybe 5 hours?

I agree with you that on relatively stock motors, the filter selection is not that critical. Once you get into a 'hyper' motor that can use 1000+CFM I think it might be more critical. Even the Rod Millen velocity stack off the Lexus GS400 that lent me the filter, was disformed. John told me it was from the intake suction sucking it in under full induction. It wasn't serious, but you could see the areas that were sucked in quite easily. It was made of very thin aluminum, so I'm sure that contributed greatly. I've heard of some Lingenfelter cars that cave in the plastic intake hoses on some heavily modded LT1's, LS1's, LS6's etc.

The only real reason to change filter sizes, at least in our case, is for a different sound. The larger filter definitely made it's noise earlier and deeper. Not sure if anyone would notice unless they were run one after the other, however.

Albert

 

I posted this in another thread and never received a reply.

Regarding your thoughts about the length and width of the intake tubing...there are a number of things...

- How will the longer tubing affect power? Increase air speed?
- Would a tube which begins wider and narrows, retain the backpressure needed to retain low-end torque while still allowing air to increase velocity?

 

what exacly is velocity sack and what does it do and how? just wondering if this is something i should look into?

 

Velocity stack is when diameter decrease from filter's internal diameter to intake diameter is smooth (If you ever seen JWT pictures it's that round thing that bolts to MAF). That allows for smoother, less turbulent airflow (which is not necessary a good thing, so I heard) and for something called ventury effect, when flow constricted by a smaller opening moves faster like a nozzle on a hose.
Now, intake design is a "deep magic" so pretty much everyone operates on trial basis and you never know what's going to help it or hurt it. Benefits from a significantly better design are still marginal so there is no point in putting too much effort into it.

Although velocity stack might help with whistling noise (no internal sharp edges and stuff)...

Have been wrong before...
Max

 

hey brian,
any word on my intake? i sent you paypal last week but i know you were waiting on some more filters. what's the status?

thanks

 

Bump,

Any updates on the shipping status ?

 

Mine arrived today...thanks Bryan...hopefully will install it this weekend with my y-pipe.

 

yo Brian, what's the dilio on the intake, my check should've cleared since it is a week since you received it already. I even got the S&B filter cuz I didn't want to wait for the K&N....if it was shipped today, thanks, if not and like Serin said, what's the status?

 

Yeah, my payment cleared last Saturday...get any K&Ns in yet?

 

bryan just emailed me with a tracking number. delivery tomorrow. woohooo!!! can't wait to fiddle with it.

thanks bryan.

 

I shipped out a large batch of intakes earlier today. I'm not 100% sure of who is who but I'll give it a shot....

2kseman - shipped - been trying to contact you via PM but your mailbox is full. I didn't have an email for you.

serin - cool, glad you got my email

ludacris - please email me your name and I'll see if your's shipped

maksim2000- shipped, sent tracking info

anyone else?????

Thanks guys for all of your support! I've taken on a few more projects but I'm trying very hard to get some more products out there.

Bryan

 

Bryan, can I get a status as well? Paypal payment came from arjeza@aol.com. Thanks.

 

jcreynolds1@hotmail.com was where you got the payment from.

Thanks