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Stock Manifold Ceramic Coated?

Kaido_RR

By Kaido_RR,
in Engines & Forced Induction

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D_Stirls Veteran

D_Stirls

Posted
Posted (edited)

Where in Aust can you get extrude honing done and what is an approximate cost. I'll be looking at getting a TD06 8cm housing honed to an in-between size (might have to go on the lath to achieve a 9cm though) as well as the exhaust manifold done in the next 6 months.

The black coating is supposed to be better (rated higher) than the chrome coating has anyone had any problems with the chrome coating pealing off?

Edited by D_Stirls
The Dan Grand Master

The Dan

Posted
Posted
nah i would not as they dont like retainng the extra heat, i have a few coated ones crack after only a few track days.

We're talking about cast iron here though. Probably the best starting material for that type of thing. If you get them done inside and out, they don't retain any of the heat.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

If memory serves me correct he has a 2835? I could be wrong.

Either way the turbine housings smallest point is smaller than the T3 flange/outlet from the manifold. You can only flow so much past that section, increasing flow to it does not change the rate of flow there.

If you want to port, that is where you would port. Then you could be hurting response, not increasing it.

Question was - "worth it". Answer is no.

Spending any money on the stock manifolds is a waste of money if you are looking for some performance gains.

I can't remember who did the toying around but RB25 manifolds didnt really hurt anything until around 300rwkw. In which most cases you are going turbos too large to fit with a spacer anyway.

wolverine Grand Master

wolverine

Posted
Posted
500rpm from porting when the turbine housing is the restriction and not the manifold...?

Ash, there is more to powerporting/extrude honing than just increasing the total flow. It is possible to make runners flow more evenly. I am guessing a good tuner can do some nice things with all the ducks lined up.

The Dan Grand Master

The Dan

Posted
Posted
If memory serves me correct he has a 2835? I could be wrong.

Either way the turbine housings smallest point is smaller than the T3 flange/outlet from the manifold. You can only flow so much past that section, increasing flow to it does not change the rate of flow there.

If you want to port, that is where you would port. Then you could be hurting response, not increasing it.

Question was - "worth it". Answer is no.

Spending any money on the stock manifolds is a waste of money if you are looking for some performance gains.

I can't remember who did the toying around but RB25 manifolds didnt really hurt anything until around 300rwkw. In which most cases you are going turbos too large to fit with a spacer anyway.

If the question said 'I have a 2835 on an RB25 and is it worth it?' then yes you are right, the answer is no.

But you can't help poor turbo selection. That like saying can I make 400rwhp on my RB25? The answer is yes. Can you do it with the stock side mount intercooler? The answer is no.

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