does anyone make any? I tried searching but my search function works once in a blue moon. what gives on that too. i paid my dues...anyways just want to know if there are any VE headers out there and how much should i expect to pay.

 

nope.
none.
non.
Zilch.
nada.
Zero.
Zip.
don't exist.
















yet.

 

hmmm...you dont say...me thinks you hidin somethin up your sleeve...care to share? lol

 

I don't think there are any VE Headers out on the market. But most people who own VE's are actually satisfied with the quality of them.

IIRC, VE headers have a fairly good design/ quality.

 

Port your stock ones. Or pick up a welder and read books about exhaust theory.

I'm doing the latter...

~Alex

 

how does the VE react to opening up its breathing a little? I know the Y-pipe is a good "bang for the buck" mod but i was wondering about exhaust and headers. would there be reasonable gains in going with a 2.5" catback with the stock headers and WSP Y-pipe?

 

Although bottlenecking exhaust isn't the best Idea. I know a full 2.5" Exhaust on a VE will lose low end torque dramatically. I wouldn't go more than 2.25" post cat...

 

I have a bit of a loss on the low end, but it seems to be a lot stronger on top. I have a Cattman y-pipe, full GReddy cat back and I race with no cat.

Except for Matt (who would do the work himself) or anyone else that could make their own, I think the modest gains replacing the stock manifolds would not be worth the trouble. The biggest restriction in our exhaust set up is really the stock y-pipe. The manifolds don't have very far to go before reaching that and when you put in an aftermarket y, you are pretty much set.

 

i dont think porting the stock ones help any...

 

My exhaust is actually really open at the moment. I hit a speed bump (or 50) a long time ago, and busted my system at the flex pipe, so i eventually cut the rest of the system out from the flex back, so now i have:
Engine-> Manifold-> Ypipe-> open air.

so i'm basically wide open at the moment (unfortunately.) and have good power, loud noise (annoying now.), and a variable loss of torque up unitl about 3200 rpms.

pretty soon, within the next two months, i was going to try to take stock headers, and study a pair of high performance headers, and try to fabricate my own headers using the same theory as the Hi-Per ones, and the same mounting set-up as the VE, of course. if anyone has any ideas, let me know.

 

The VE exhaust manifolds are already tublar. If you take off the heat shields, you can see they are pretty damned good for 1992 and for an OEM piece. I still think there might be gains but not as much as one would think. I think smoother bends and longer primaries would help low end grunt and mid/high end power.

 

there can always be gains with a different design. the stock manifolds are in fact tubular, but they're crush-bent and are not a 3-1 collector design. proper tubing length, diameter, and collector design will make some significant gains.

Look at Mike Kojima's testing he's doing with the SR engines. the header he had designed by Burns Stainless made something like 15hp over the biggest, baddest Hotshot header out there.

And no, porting stock manifolds is not an option. they are tubular and the wall thickness isn't sufficient to allow much material removal.

 

would a 3 into 2 into 1 help at all?

 

probably not.
or are you referring to a 6-2-1?

 

nope, I meant 3-2-1 then y-pipe.
I just saw a set on a customers legeng and was wondering if it helps like 4-2-1 headers do on a V-8 or 4 cylinder.

 

Our version of that is a 6-2-1, We really don't have much of a choice with 6cyls..

~Alex

 

so basically go with a Y-pipe and 2.25" exhaust tubing. I've got 2.5" on my KA altima and it helped rather than hurt. i would have thought the VE needed to breathe more than the KA.

 

3-2-1 would indicate that we only have 3 cylinders.
you're referring to a 6-2-1. 6 pipes into 2. those two into one.

 

no, that is but one side unless you want to call it 6-4-2-1
0-00
-Y-|
--Y
on each side

 

The stockers could benefit from a larger diameter at the ports

 

Did MrGone just post in the 3rd gen section?

 

You're smoking crack. where do 4 cylinders come into play when you're using merge collectors on a V6?

 

you start with 6 tubes (3 on each side) 4 of the tubes (2 per side) merge together leaving 2 unmerged tubes (1 per side) for a total of 4 tubes at this point (2 per side)

something like this :

obviously that's only 1 side

 

So the middle cylinder is connected to the other two cylinders? Thats retarted. Id never believe that would make any power any where over any other setup unless I saw the dyno in person....That cant flow well.

The middle cylinder essentially has 1.5-2x as much pipe to fill. I don't see how that could be balanced.

Edit- If that "picture" is right then one cyl has 6 inches more pipe then the other two.

000-000
YY YY
Y Y
Y

Thats the only other design I could see making good power.

~Alex

 

Brian, you'd see more losses than gains for that setup.
a V6 has three cylinders that fire 120* out of phase with each other. a good 3-1 collector in the right location to provide the correct pre-collector volume is what's needed on each side.
So you would have a 6-2-1 when it's all said and done... which is what you ideally want.

 

I was basing part of my theory on V-8 function which I'm more familiar with.
but at this point to me, it's all conjecture. I don't have a V6, nor will I likely be getting one.

 

In the case of a V8, you'd use an 8-4-2 (the one you 'chopped above) or an 8-2 that has a pair of 4-1 collectors on it.

then of course you'd want an X pipe somewhere in the back, but for the headers themselves you'd use with an 8-4-2 or an 8-2. which is simply a pair of 4-2-1 or 4-1.

The reason for that is that the pulses travelling down each manifold will be 90 degrees out of phase with each other. you pair two up at 0 & 180degrees, then the other two at 90 & 270. this gets you the most even spacing you can of pulses travelling out the other end of the exhaust so they're not fighting each other for airspace inside the piping.

but for a V6, they're evenly spaced at 120* from each other, so you can stick 3 into 1 instead of two into one as you would on a V8 or I4.. it's just a matter of the timing/spacing of each cylinders' exhaust pulse. you want them as even as possible.

 

http://forums.maxima.org/forumdisplay.php?f=77

 

bbs.legacycentral.org
thirdgen.org :P

 

goto a custom exhaust / welder shop and get a quote, i did and i was quoted around $850 for a set.

 

Have a '94 maxima vg, gxe I guess; Are there any aftermarket exhaust systems available for my maxima? Will a greddy sp2 work?

 

http://www.google.com/custom?domains...ORID%3A1&hl=en

 

Nice link.

 

I don't think it wourth it the oem's already tubular.

 

Did you even attempt to read anything before asking that??

 

VG's don't have any performance products made for it.

Sorryyyy

 

Well there's Crapsetter headers. But most catbacks for our 3 gens are universal. ie.. vg/ve fitments. But from the cat back forward, they are diff

 

Sarcasm > You

 

I ported my VE exhaust manifolds. I was able to remove a CRAP LOAD of material. I first welded the flanges from the outside, then removed all the weld obstruction inside the ports.





I did before and after dyno testing also. NO GAIN at all!! No loss either. My power curve looked identical as before. I did do several dyno runs before and several after on two different days. But I made sure the weather conditions were exactly the same on both days.

Oh well, all my port work wasn't a total waste. Atleast it kept me busy for a few days. I did think I would have seen a couple horses from removing this much metal that close to the heads.

 

Thanks for the info. Now I just need to find that greddy sp2 that I saw somewhere online for around $200. I can't believe I didn't save the link.