hot_wax_tree

Is it weird that when I goose my 02 6spd that it goes great then when I get to 4k RPMs she gets way louder(intake) and you can definitely feel a power gain(or what ever you wanna call it)....so is the just my little valve thats in my IM or what? it just seems weird if any of you have driven a 4cyclander bike its just like on that where the power band jumps and you get pulled back a little more when you hit higher RPMs.

McSteve

iTrader: (3)

You sir just have discovered VIAS, our VTEC. That's right, make em Honda boys jealous

2slow

iTrader: (6)

Except some VTEC engines also have variable length intake runners (B18 & H22). If only the Maxima had VTEC it could keep up with the TL's huge top end.

NmexMAX

iTrader: (22)

TL IM is actually extremely FTW too.

hot_wax_tree

Yeah I knew that was the VIAS Valve but I didnt think it would kick in like a bike does. its just seems like.....a lot. but yeah thank ya I was just checking.

JAke

NmexMAX

iTrader: (22)

It's because the power rises, then drops, then rises again @ ~ 4k.

This is way down low RPM


And here's a larger look at what's happening:




And here's the FSM's representation:

nismopc

iTrader: (3)

Reason why so many like the block off plates. Minimizes the fluctuation...

NmexMAX

iTrader: (22)

But all that torque lost.

jowo9

iTrader: (1)

meh, it's worth it at 4000rpm+ Not only does it minimize fluctuation, but it gives you improved top end by removing air restriction... Kinda like a less extreme version of the SSIM mod (gutting the IM)

NmexMAX

iTrader: (22)

And who needs all that tq down lo in these FWD's anyway right? Smoke and $$$ for tires FTL!

jowo9

iTrader: (1)

Yeah! Exactly

hot_wax_tree

Wow thanks from reading other threads I had a theory formed of what it does and now.....well...i think I get it. like i under stand the physical actions of it, so if I take it out i know I get a more constant power band?

SoonerFan

iTrader: (5)

CraigSE

Especially if your VIAS is on the fritz... Mine was going wonky and not opening etc for a while. Was a source of headaches when I couldn't get the power I needed to pass on the highway, etc. I turf'd the VIAS setup and used the block off plate, no more worries, and the car pulls good all the time.

That's my case though, most ppl with functioning VIAS if not otherwise modified should probably just leave it be.

NmexMAX

iTrader: (22)

Leave the stock Helmholtz if you want a smooth powerband.