xstalkrx

so what is the advantage of a log style manifold? I know that you have to have an internal wastegate because there is no wastegate flange on a log style. But do the log manifolds offer better air flow or what?

93LSivic

Huh? My maxrev has an external wg on it.
The only advantage i could see with the log is that the exhaust doesnt really have any time to cool off before it goes into the turbo.

*Edit I wouldnt really call that much of an advantage though. There are many more gains to be found in a manifold that has had a good amount of r&d put into it.



[Modified by 93LSivic, 1:23 PM 3/20/2003]

@irborne

it's cheaper.

you're misinformed buddy; the log style manifold can either have the external wastegate flange. it's all depend on the individual needs

no; the equal length manifold offer the best flow.

Overblown-Teg

Log manifolds also take up less space and make it easier to fit a big turbo. The main reason most guys go with a tubular is the bling factor. It will probably make a little more power but mostly its bling.

93LSivic

This has gotta be the most stupid response this week.
If i wanted bling then i would buy chrome rims. Or I would get gold caps on my teeth.

Sonny

http://www.mrbling.com

Sonny

Smashback

Nailed it on the head Sonny. I love that site. I think I'm getting the jewel encrusted ones.

Seriously though, log manifolds work fine, but a Revhard or Inline Pro will flow better. Will it make a difference on your motor? Depends on a million other things.


[Modified by Hatchblack, 7:46 PM 3/20/2003]

zojirushi

don't log manifold tend to crack?

UberTeg

Are you deslexic? (sp?)?

johnisenglish

Nope, but equal length mani's do...

...or so they say.

Either one should hold up fine IF the welds are good and it's supported properly.

And to whoever said Equal Lengths are for bling --->

BoostedSi

only the shitty equal lengths crack, like the obx. I've also heard of the drag mani cracking...but luckily mines held up for nearly 2 years with no problems.

Snafu-Si

Log style mani's are smaller, which often allow you to keep things like your A/C in your car and your power steering and such things like that.

big tubular ones offer better performance when less lag that log style manifolds suffer from, but take much more space, and many of them you have to get rid of you A/C, Fan, things like that to get them to fit in your car.

How hardcore are you? do you want your A/C?

Many of the more Hardcore turbo people seem to hate Log style manifolds. They just don't really like them. I like my A/C, so I got a log style one from maxrev.
Tom Payn thinks maxrev mani's suck though. So do the mechanics that work there... oh well. That what he told me anyway.

PaynTech: What kind of manifold did you get?
Me: That maxrev one on Honda-tech.
Payntech:... you mean.. taht log style thingy?
Me: (here it comes) .. yes....
Payntech: aw... man those suck.
Me: Doh.......

Not a huge deal, again, depends how much you really need.

Just get what is best for you.

Goodluck.

93LSivic

So is Tom Payn supposed to be some kind of god or something. Oh no, they suck cause Tom says they suck....what a douche.
Fact is, is that they work, people do produce power with them. Not every turbo honda owner needs to spend 600+ on an equal length manifold. I currently run a maxrev log and dp, yes Im selling the pair, yes I decided I want to have a more radical less reliable 500 whp daily driven car---that is my choice.

The log style manifold is fine, I would suggest it to anyone who wants to make up to 350 hp.

--Dan

swrdply400mrelay

Log mani's use a little pressure to spool up the turbo.

edit: I take that back then.


[Modified by swrdply400mrelay, 9:05 PM 3/21/2003]

Tinker219

If a manifold flows better, than wouldnt that provide less lag?
Log manifolds dont really FLOW persay, they are pressure based, meaning that just pressure inside the entire manifold is what spins the turbo.
Equal length, tubular manifolds use exhaust pulses to spin the turbine, and since each pulse is directed right toward the turbine, tubular should produce less lag.

Lsos

I would think tubular would produce less lag...

Generally, log are considered stronger than tubular. I guess you can support a tubular to make is as/ more stronger, but still....

Tinker219

Geoff would be able to put all of our questions to sleep...

PM-Performance

i dunno i haev had luck with my log manifold, but i have heard that if i went with equal lenght it would flow better and make a few more HP , but i hear they crack eaiser. . . . . theres ups and downs to each set up if you ask me

Snafu-Si

I think the log style mani's are fine with mild setups for daily driving, which is wha I want, and what most poeple...... man.. I just saw the iraqi packe just blow up!

Uh.. anyway, I think they are good for everyday setups, I just think the big time full setup tubular ones are a overkill for some, it was for me, get the kind that you need. I think Payn is just used to making full race setups instead of a daily driving turbo.
No big deal, payn is a nice guy and helped me out no matter what I have.

I remember, they didn' seem to like my Exedy clutch either.
I like it.

boosted hybrid

Log manifolds work off of heat and pressure theory. They simply are short, and direct the heat and pressure towards the turbo in the shortest possible time period. Log manifolds are not about flow persay, although the inline pro/revhard flows a bit better than the max-rev/drag manifolds due to the runner lengths. Log manifolds will not give you better response/spool up out of a turbo.

Equal length turbo manifold work off of sound/energy pulse waves coming from the engine. The runners are positioned so that they take the energy and focus each runner together into a collector, which feeds into the turbine housing. This energy that is focused allows for the maximum amount of energy shoved into the turbine housing giving the turbine the maximum amount of inlet pressure. You are freeing up alot of horsepower by giving the exhaust gases/sound/energy the most efficient way of escaping the head and into the turbine. If you are concerned that the manifold is losing to much heat, then wrap it with heat wrap. If the header is designed properly there is major horsepower and torque to be gained by switching from a log to equal length style. Usually spool up is increase by 500-1000rpm quicker, and power levels are increased by 20-50 horsepower in upper boost levels.





[Modified by boosted hybrid, 1:27 PM 3/21/2003]

PM-Performance

damn man you just sold me on equal length, we can test that theory, lets bolt up your meng manfiold to my car and dyno it to see how much more we put out.

boosted hybrid

The meng manifold will make some more power over the max-rev manifold that you have now, but it wont compare to the full-race manifold. The collector design on the full race is far superior to the meng. The manifold will direct the most amount of energy towards the turbine, and be less restrictive than the meng. How much more power I couldnt tell you, but give me a month and I'll let you know.