Equal Length vs Log manifold video/dyno
 

I saw this on honda-tech and also saw it on FR's website. Basically Full-Race did a comparison with one of their pro street manifolds vs a log manifold they fabricated. They took video of the entire thing. 68.3whp! Pretty amazing.

The Thread
http://wakesports.com/full-race/inde...&st=0#entry875

The video (right click save as)
http://cs.widener.edu/~epanek/FR%20Manifold%20Test.mpg (30megs)

Jeff

Re:Equal Length vs Log manifold video/dyno
 

:o i didn't know it was that big of a difference
i noticed at least a 50 hp difference

but im on a budget so log is all i could afford :P

Re:Equal Length vs Log manifold video/dyno
 

wow i didint think it would be that much of a diffrence

Re:Equal Length vs Log manifold video/dyno
 

well i know what type of manifold to go for now

Re:Equal Length vs Log manifold video/dyno
 

My thoughts exactly. :o

Re:Equal Length vs Log manifold video/dyno
 

While we're talking about budgets, does anybody here know how much to expect to pay for an equal length manifold compared to the log?

Re:Equal Length vs Log manifold video/dyno
 

a pretty penny ;) Check out some of the Full Race manifolds. Yes they are definately top quality, but damn, so expensive. Theres a few other choices out there though.

Re:Equal Length vs Log manifold video/dyno
 

Between $600 to $1100

Re:Equal Length vs Log manifold video/dyno
 

^^^
where you can get a log for around 150:D
but that's just me. You might be able to get one cheaper
but this is HOMEmadeturbo.com
the price of an equal length mani is more than what some on here spend on their whole kit ;D..i find that pretty amusing

Re:Equal Length vs Log manifold video/dyno
 

or you could buy a tig welder with how much one of e/l mani cost and make one yourself

Re:Equal Length vs Log manifold video/dyno
 

good point

Re:Equal Length vs Log manifold video/dyno
 

That's ------- cool that they did that. I have always wanted to see the difference.

It's funny how they have like 35 guys working on swapping a manifold. I can't see that being too much faster than just one guy. The video makes it look like they rebuilt the motor while they were swapping manifolds.
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Re:Equal Length vs Log manifold video/dyno
 

I gues my only questione is, how did the air/fuel ratio look between the two dyno pulls. ??? 98ctr

Re:Equal Length vs Log manifold video/dyno
 

i think the manifold beau made for me in the reason my numbers at 10psi were so much higher than like dustins and other LS's. most had logs im sure

Re:Equal Length vs Log manifold video/dyno
 

Cool video!


Im gonna go and weld up some log manifolds now :P

Re:Equal Length vs Log manifold video/dyno
 

I am blown away by that - I thought up to about 15psi it didn't matter that much - Okay I'm not making a log manifold.

Re:Equal Length vs Log manifold video/dyno
 

I saw this whole comparison and I think its a little one -sided. First lets consider the price difference; $150 for a log vs $1200 for a Full-Race. Therefore the 68hp came at a price of $1,000. You could buy rods and pistons for that price and up the boost for massive hp gains. If your considering one of these manifolds, you should think long and hard about what are your HP goals cause a $1200 manifold on a stock manifold is just stupid.


Also they're comparing the absolute worst manifold to a merge collected manifold. Of course its going to make more power. I am willing to bet money that if they dyno tested a ported HF manifold compared to that log manifold they made, it would show the same hp. If they built a manifold with a merge collector that hp difference would dramatically increase. Kinda like that new manifold from Lovefab, sometimes simplicity is good. But they say that a merge collector on a log is useless becuase it works off of pressure which is also bullshit. Mass flow rate is what spools a turbine, any thermodynamic class will tell you this. If the gasses are running into themselves, swirlings, causing a massive loss in velocity that will translate into lost power. If you direct those gasses into the turbine with even a simple merge collector you will see huge power gains.



However, this test did prove that good marketing sells tons of manifolds to people who don't really need them.

Re:Equal Length vs Log manifold video/dyno
 

hmm... I'm not convinced it has alot of merit for a fun potent street machine ...certainly not on a budget. The turbo on my 1600cc Toyota made 140 factory HP on the car it came from, with the stock gate I'm making close to 200 HP with 40% less cubes than the OEM application, you can't tell me that I'm going to make even close to another 50 HP just by switching manifolds with my little 250 cfm turbo!

I didn't like the vid, reminded me of an infomercial with only half the story, besides it sounded like they had an exhaust leak with the log.

Neil

Re:Equal Length vs Log manifold video/dyno
 

What do you think a wastegate does? it sounds like wet lesbian ----- farts aka exhaust leak. You could hear it on the Log run better because they didnt have a dump tube for it like the equal length manifold.

Read the thread, nothing was touched as far as boost, 10psi and 10 psi. DP's everything was the same.

Not all of those manifolds are 1100 dollars either,
neukin is 600 shipped
Shitbird is 650 shipped
Lovefab is 800 shipped
RPI 840 shipped

Ya they are a little expensive, but I would definatly just buy a collector from shitbird and end up making my own.

Jeff

Re:Equal Length vs Log manifold video/dyno
 

Ghetto D made a manifold just like that, and I know it wasn't even $200.

Going to beat Steph Papadakis = Buy it.

Going to beat Brian Spilner = log it. ;)


It is nice, but so is a ferrari. :-\

Re:Equal Length vs Log manifold video/dyno
 

I'd like to see a D-Series comparison with the log and hf mani.

Re:Equal Length vs Log manifold video/dyno
 

i know some people hate them, but my team mate bought a tubular (not sure if its exactly equal length) manifold from ssautochrome. it was decent quality. not the BEST, but what u expect, it was 150 and came with a down pipe. he put a tial external on ,with a t3 turbo. ran sooo smooth, and he hasnt had one ounce of a problem from it. and no, it hasnt cracked, yet.

Re:Equal Length vs Log manifold video/dyno
 

keyword... yet :P

Re:Equal Length vs Log manifold video/dyno
 

dam i hope it didnt really take them that long to switch manifolds evenin elapsed time it seemed long

Beau

ps i just made 3 log manifolds their not choice and not mine but the welding pays the bills

Re:Equal Length vs Log manifold video/dyno
 

I'd like to see how an equal length compares to a short individual runner non-equal length, where the lengths of the inside two runners are equal and the lengths of the outside two runners are equal, that's what I'm thinking of tackling next, since I need a new mani anyways for my new turbo.

Neil

Re:Equal Length vs Log manifold video/dyno
 

How about the weld quality on the log manifold? Is it reliable enough to be used for a daily driven street car? Cause my engine (sad to say) prolly won't stay in there for longer than 2 years. But I can't exactly afford the 1000 bucks for a manifold...

Also, if the prices are low enough for the log style, are there gonna be any group buys anytime soon?

Re:Equal Length vs Log manifold video/dyno
 

i agree. I would like to see the #'s between each manifold running 10psi on a D16y8

Re:Equal Length vs Log manifold video/dyno
 

the HF manifold, even ported, has TINY runners compared to most log manifolds. my guess is that the HF manifold will make the least amount of power of almost any manifold. it gets the job done, but its not ideal for power.

Re:Equal Length vs Log manifold video/dyno
 

I disagree, I bet the HF manifold port matched and with a good adapter plate would outflow a log manifold for sure.

Re:Equal Length vs Log manifold video/dyno
 

mine isnt really a log manifold, the runners mearge to a collector... and my dyno numbers where probly lower cuz my "filter" was clogged/dirty and that turbo was fucked...

Re:Equal Length vs Log manifold video/dyno
 

i was thinking along the same lines... ---- the equal length, just get an equal TIMED manifold, where the pulses reach the turbine inlet at even time intervals..

that vids great, there's like 2 guys working at a time, the rest are just standing around, it's like it is city workers or something! haha :P

phil

Re:Equal Length vs Log manifold video/dyno
 

Like the reply on honda tech said I bet vtec wasn't engaged on the log manifold. There is a huge difference starting at 4800 rpm and I believe that is where vtec engages, concidence I think not.

Re:Equal Length vs Log manifold video/dyno
 

or it could just be that the log didn't effectively move the extra exhaust gasses caused when the bigger cam profile hit and the equal length did.


hahahaha, he said team mate, and he wasn't talking about soccer, hahahaha, teamturbolesbians.

Re:Equal Length vs Log manifold video/dyno
 

and also my engine is a b18b and yours in a b18a

Re:Equal Length vs Log manifold video/dyno
 

um... since when did that matter?

Re:Equal Length vs Log manifold video/dyno
 

um... since b18bs have 10 more hp ad 6 more ft-lbs stock.

better flowin head/IM/cams.

Re:Equal Length vs Log manifold video/dyno
 

you guys must be talking about when dustin had the regular ls and not the lsv, right, because the last time I checked the lsv doesn't use an ls head.

Re:Equal Length vs Log manifold video/dyno
 

yes that is what we're talking about

Re:Equal Length vs Log manifold video/dyno
 

oh i thought we where talkin about the D15B6? ::)

Re:Equal Length vs Log manifold video/dyno
 

are you talking ---- to me or random? if you choose the correct answer I won't threaten to ---- you up.