This just in: BPs are F1 motors.

 

Go build some manifolds and then come back and talk.

Dann

 

Sorry, too busy dead-hooking every gear in my 250whp Miata on street tires.

 

And it has a power curve like this too right? And circuit racing spring rates and camber too?



Look a back and forth troll does neither of us any good, the point is that not a single person on this forum has or has built or has tested a manifold with the OP design, so none of us can possibly say how it will perform.

Dann

 

 

Do you have anything constructive to add to this discussion ?

Look, whatever, again, why the **** can't MT discuss something that isnt the norm without banging on about how its probably **** over and over with no positive consequences for anyone..

 

Not the same, but still cool.




Other Projects

 

Yeah but how good of an idea is it to pair cylinders that fire one after another? We're not even talking about the collector on this manifold, we're talking about what happens just before it.

 

Now that's a much better looking octopus header. Very nice. I kinda don't get his W/A intercooler but that's a different topic

 

And yet log manifolds are 100% acceptable when running at or below 80% of the flow of the turbo..

I bet this manifold makes more power than the FM or begi ones, and at least as much as the standard absurdflow deisgn.

The runners aren't paired any more of less than any of the following manifolds in practice.





Etc,

Dann

 

People that are running log manifolds know they are leaving power on teh table but they are running logs because they are cheaper. Compare apples to apples dude.. Compare it to absurtflow and begi S4 manifold. Do you see a 4-1 manifold in post 1? Theres just no way a sane person would pay money to have a long runner manifold built thats only as good as a log.

 

Just to clear up a bit, yes I am in the UK so the manifold will fit on fine. The only reason I'm looking at this manifold is because It's a lot cheaper than any other manifold out there that I can find... the shipping and import tax puts an fm or begi log manifold at about $650 so as I can fit and test this for less than half that (including sourcing a T25 turbo).

As it looks like the results will be interesting I may as well give it a go... so the manifold will be with me in a few days. I'll update with progress and a dyno sheet once its done. Hopefully won't take too long but I'm fitting a new diff and inlet manifold at the same time so don't hold your breath!

Russell.

 

I am comparing apples to apples, I said it would make more power than the FM and Begi cast manifolds and I said at least as much as the absurdflow one pictured above.

The difference between a log and a tubular setup is 1-2psi of boost at the very most, to achieve the same whp.

And there is NO WAY this is only as good as a log, again I bet that it makes as much or more power than the absurdflow style manifold that is so popular here.

Dann

 

I get danns points.

the manifold is going to work well... but I think that the collector could have been optimized, but thats another topic. longer runners allow smooth flow... your going to make power.



triple88a, give it up on the cylinder pairing. its not an all motor header... turbo manifolds are pressurized and pairing really doesnt matter. neither does equal length on any kind of standard placement.
think about how subarus have like 4 feet of extra pipe (x2) on the longer runners and changing to equal length only gets like 2hp on an already powerful engine. **** doesnt matter, just get the air into the turbo from the engine smoothly and you will make power.





LOL log manifolds. I have vowed to never build another log since the one i built late this summer. there is nothing good about a log manifold and there is always a way to fit something else in...even with a bmw where space is hella tight. That being said, the only thing that this manifold in the OP posted will loose to any of the other manifolds mentioned here is turbo lag.... long pipes mean more volume to bring up to pressure. not a big deal road racing, but if its a street car you should notice a difference... it will be less than 500rpm though if doing a loaded pull.

 

Actually they gain around 25hp from going to an equal length well designed header.

 

U're missing a 0 buddy. Subbies get 20-25 hp from switching from the goofy unequal manifold to an equal one and keeping everything the same. They also get better spool.

 

Thanks for all the info / discussion guys, I'm learning fast on this ... reading all the pinned threads like crazy so hopefully won't ask too many dumb questions! I'll post again once I have it in my hands, my car is off the road at the moment anyway so I'll pull the old mani off it tomorrow ... thats a cool side effect, my hillclimb car can inherit my Fujitsubo!!

Russell.

 

If it doesnt have bracing, i would weld a few in, maybe between the space on each tube... just for some extra support. That looks like a crack waiting to happen.

Also, if you are doing it, we want results and all that jazz. Im curious about how it will do. So, keep us informed if you can

 

He's going to need a crane, not just gussets.

 

haha... definitely...
Ok... So, steel strut tower brace, with a heavy duty loop welded to the bottom above the manifold...
Then Weld a loop to the top of each runner on the manifold....
Attatch a decent chain from each runner loop, to the loop on the brace.... BAM... problem solved... lmao