Power Porting The Standard Manifold

[ZILR-34]

hey guys

the other day i toke off my Exhaust manifold off to replace 2 broken studs anyways i was thinking since the manifold is off why not power porting the standard manifold and get it HPC coated.

does anyway one know where i can get it done in melbourne or what to search for in the yellow pages?

cheers

bill

[ZILR-34]

anyone?

[paulr33]

why bother? just buy an off the shelf item thats already got the R&D in it and is direct swap

[ZILR-34]

not looking to spend that much cash on it. just want a place which can power port it

[Cubes]

Would be good to see if there's any real world results from power porting the std manifold.

If it were pick up 20rwkw (as those cheap china manifolds do once up near 300rwkw) I'd do it.

You will most likely have to send the manifold off to UAS.

Do it.. Then share the results with us all.

[wolverine]

cubes, i don't think the guy that was extrude honing the exhaust manifolds for UAS is still doing them.

i think he is making more out of selling the extrude hone media.

[ZILR-34]

Would be good to see if there's any real world results from power porting the std manifold.

If it were pick up 20rwkw (as those cheap china manifolds do once up near 300rwkw) I'd do it.

You will most likely have to send the manifold off to UAS.

Do it.. Then share the results with us all.

hi cubes

what is UAS? how much and how long will it take?

cheers

bill

[wolverine]

uniqueautosports.com.au

[SLY33]

Try giving Andrew a call

[ZILR-34]

i did and they wanted $660 just to do it. if it was the $200 mark i would do it. but if i put an extra $400 ill get an 6boost manifold which is way better. so power porting is out of the question..

[Bass Junky]

Go Direct to a power porter, not to UAS.

Howe Automotive - Bacchus March

03 5348 2389

C.O.M.E - Melbourne

03 9571 9605

Blue Chip Tuning - Melbourne

03 931 09822

A.T.S - Melbourne

03 9335 1254

Racecraft - Melbourne

03 9338 0550

Motivator Race Engines - Bendigo

03 5443 3883

Try that.

[Bass Junky]

Do you think that Andrew would have results from the fitting of that manifold to a standard engine/turbo car?

I was speaking with a Gentlemen who told me that the restriction in the exhaust is not the manifold itself, but the A/R of the turbo.....

What turbo are you running?

[Cubes]

Bass,

I agree depending on the setup the restriction is within the turbine a/r and wheel combo; however a manifold that flows more equally results in improved even reversion across all 6 pots.

With equal reversion each cylinder receives improved fuel and ignition requirements which results in increased power, spool, response etc.

If it pans out true in practice who knows? :S

Maybe the extrude honed std exh manifold will show improved results with a setup thats pushing around the known brick wall limit of 300-320rwkw of the std exhaust manifold.

For example there was a bloke here running with the std exhaust manifold pushing near 300rwkw; dropped one of those cheap china crap things on it and it picked up almost 20rwkw. Took it out to Mallala and blew a hole in it.

He was running a .63 IW Gt3040.

Made 313rwkw with a little over 20psi, 256 poncams, thicker headgasket, std bottom end; ran like that for a few years (daily) before he stocked it out and sold the car for a Territory Turbo. Bit off topic lol.

[R31Nismoid]

My thoughts exactly Poiter.

Although im not the best brain for that whole fluid dynamics... and my logic often doesnt work outside my own brain

The turbo is the restriction (clearly), look down past the flange and you'll see exactly where its tighest point is.

Getting more air to that point, isnt going to "allow" extra air to pass if its already maxed out you'd think.

If its not, then you might get a gain.

Joel - Do you think the gains from going to a different manifold arent due to flow volume, more to design and collector maybe?

With the air flowing in a better direction, as opposed to more air. Similar to porting in volume, but not in terms of direction and exit (from the manifold/turbulence)

[ZILR-34]

as for the turbo question. i have a GCG R33 high-flow on my Rb20. just want to see if it will help spool the turbo abit quicker and gain sum more kw's

[Cubes]

Joel - Do you think the gains from going to a different manifold arent due to flow volume, more to design and collector maybe?

With the air flowing in a better direction, as opposed to more air. Similar to porting in volume, but not in terms of direction and exit (from the manifold/turbulence)

Design/Collector. I think so.. There was a thread floating around where some one had flow test results of a highmount manifold, hks low mount, china and std exhaust manifold. The std exhaust manifold flowed quite well compared to the others. In flow...

The real increase in power is a result of equal levels of reversion as a result increased ignition and more optimal afr's. Also not to forget improved overall cylinder filling.

A little like the old buffalo theory.

The motor can only run as much ignition as the cylinder that has the worse VE can. Poor VE = increased levels of det due to the old charge contaminating the new.

Unfortunately this is something that flow tests can't really simulate when everything is under pressure with high velocity exhaust gas.

[Bass Junky]

Just spoke to Andrew at SPP.

They have recently done some good stuff with BA Falcons and Evos, big spool increases etc. More heat rejection into the gas flow as opposed to the manifold itself.

I've got a manifold here which was donated to this exact cause recently. If somebody is keen on doing it, I'd be more than happy to donate this manifold to the cause, as it was given to me for that express purpose.

When I spoke to my tuner, he wasn't convinced on the idea.

On the other hand, I've spoken to a guy who had an Apexi RBFKJHSF(U345y whatever they are turbo which hit a brick wall at about 250 rwkw. They couldn't tune past it no matter what they did, so they whacked a pressure gauge on the exhaust manifold itself and there was HUGE back pressure, so they changed exhaust manifolds to a tubular design and picked up a shed load of power.

So there are two sides to the story, but I think it may come down to the turbo and the relative restriction it poses.

Maybe if somebody like myself fitted one, I might not pick up power up top because the restriction is in the turbo in my case, and only up high, but I might spool faster, or pick up more grunt through the middle.

Maybe there wont be any change at all.

Unfortunately $660 is too much for my to spend on a 'what if'. I already spent $600 a few years ago on the 'what if' of the adjustable exhaust cam gear on an R34.......

BASS OUT

Who wants to sponsor me? $50 per person, I supply the manifold, I'll supply the fitting and dyno time......

[paulr33]

ill try it but im not keen on $600 for nothing

im on stock turbo still so might be useful for most avg guys using stock turbo and stock manifold

the gains would only be more with a bigger turbo and an upgrade manifold

are u sure porting it is the best cost effective way, surely i could just get a hks low cast off yahoo jp auctions for around that price

[Cubes]

$600 is just too much. If only they cut the price in half; had a greater turn over they would no doubt be ahead in the long run.

Does $600 include the port matching both sides? Mine is already port matched so I may give the bloke a ring in a few days and see what he can work out.

[R31Nismoid]

Pete, you need to do more digging

See, what is the design of the manifolds in question?

EVO/BA, you have to look at these things as they might have a half decent setup already, so some porting might not go astray... also look at the turbos both are running.

The BIG rear on the GT35 is going to flow a stink load, same with the evo turbo as its twin scroll rear housing i believe.

There is more than just giving the "car" as an example. Gotta look at the parts being used.

When you look at a VG30 rear end, its nowhere near as roomy