82streetracer

iTrader: (1)

Im looking for a t04b divided turbo manifold, external wastegate

I was looking at the hks cast one but this is going on a FB and I was told that it gets to close to the idler arm and fries the bushings.

I was also looking at the OBX manifolds on ebay. but dont you have to add spacers to keep the turbo from hitting the manifold?

Post some links.

82streetracer

iTrader: (1)

Sorry its a 91 Jspec motor.

Scott 89t2

the HKS one is not divided. your best bet is probably to find someone local to custom build one to fit in your car. it won't be cheap. $1000+ probably. but they are $1000 for the FC too if you can find one.

Ryde _Or_Die

I believe someone locally sells SS divided ones for like $500 or so. I am planning on using one. I'll post in here when I get more details. A friend said they look reallll nice.

ERAUMAZDA

why is divided so speical

Ryde _Or_Die

From my research, faster spool and better top end.

ERAUMAZDA

Is that because the air has to be forced through a smaller diameter.

Scott 89t2

it's sorta the same as having true dual exhuast on an N/A. each rotor is seperate untill only right before the turbo blade. instead of meeting each other right outa the engine.

Evil Aviator

Somewhat. The total cross-sectional area is the same, or only slightly less, than an undivided manifold, but the smaller diameter of each section maximizes the velocity of each exhaust pulse. This helps spool the turbo faster at low engine rpm, but it doesn't create very much of a restriction at higher flow rates. Technically, with everything else being equal, an undivided manifold would cause less drag due to its reduced surface area vs. a divided manifold, but divided manifolds seem to yield the best overall performance on engines with few exhaust pulses per revolution, like 2-rotor engines and 4-cylinder engines. A divided manifold doesn't make much difference on engines with multiple cylinders or rotors, and its performance advantage is also reduced at higher engine rpm. An additional advantage of the divided manifold is that the exhaust pulses do not mix and cause interfering turbulence or reversions with each other. This is one of the tricks used on the S5 turbo manifold that allows it to spool the turbo so fast without the fancy 2-stage actuator ala the S4.

Note that you really need to use a turbo with a divided scroll to take advantage of the divided manifold, and vice versa.

82streetracer

iTrader: (1)

yeh, my turbo is divided.

I emailed someone at RX7store.net and asking if the HKS manifold was divided, The guy said it was.

I could fab up the pipes but I would have to have someone weld them.

Where can I get a 13b exhaust flange in Stainless?

banzaitoyota

Have a shop cut you one with a PLASMA CUTTER or a Water-Jet

pillage6

My manifold is cracked and was wondering where to buy a new turbo manifold also, any help is appreciated.

A guy in town said he could make me one, but a known company would be worth the extra money.

rxse7en

WestJaxVert got his made at Speedcraft here in town. I seem to remember it was in the $300 range.

pillage6

Yeah, the only hard part is that they are on the other side of town and I work 9-5 mon-fri.