Low Mount Manifold Options

[Philr32]

Stock. Has been proven to over 430rwkw by me so far, with a simple external gate off the turbo housing.

More important than the manifold... Which fuel will you be running?

Currently 98 but when I do the manifold and turbo will be united E85. I don't doubt that you can make it work but a standard manifold would not be ideal. Especially for faster spool up and why not. Not to mention how much extra exhaust gas needs to be flowed when running E85

[Philr32]

Stock. Has been proven to over 430rwkw by me so far, with a simple external gate off the turbo housing.

More important than the manifold... Which fuel will you be running?

I Probably should have mentioned it's off an Rb25 s2 not a 26. Out of curiosity has your exhaust manifold been ported out?

[scotty nm35]

It's your money, I know of many other parts I would rather spend the $1500 on.

Everything is a restriction to some extent, I just prefer the factory manifold to anything else I have fitted so far, including 6boost.

[scotty nm35]

I Probably should have mentioned it's off an Rb25 s2 not a 26. Out of curiosity has your exhaust manifold been ported out?

No, no porting was done, just a 45mm gate off the housing.

What is so hard to believe? The turbo nozzle is 10 times smaller than the runner diameters all added up, how can the manifold be the restriction. The turbo is the obvious restricted part, but hey, go and stick a .63 rear on for 'response'...

[Philr32]

No, no porting was done, just a 45mm gate off the housing.

What is so hard to believe? The turbo nozzle is 10 times smaller than the runner diameters all added up, how can the manifold be the restriction. The turbo is the obvious restricted part, but hey, go and stick a .63 rear on for 'response'...

I've heard the stock manifold is huge restriction and traps in a lot of heat because it's trapping so much exhaust gas and also because cast iron holds heat well. What do you mean the turbo "nozzle"?

[Philr32]

I appreciate the input but I'm looking for options in after market exhaust manifolds

[scotty nm35]

Huge restriction that flows 430+kw?

Anything traps heat when the exhaust gasses are 1000+C. It is the way the materials deal with the heat, and how they allow expansion of the metal without cracking or warping that makes or breaks a setup.

[scotty nm35]

I appreciate the input but I'm looking for options in after market exhaust manifolds

Sorry, there isn't one I can recommend, all have their drawbacks.

[Philr32]

Huge restriction that flows 430+kw?

Anything traps heat when the exhaust gasses are 1000+C. It is the way the materials deal with the heat, and how they allow expansion of the metal without cracking or warping that makes or breaks a setup.

Are we taking RB25 manifolds or RB26 manifolds? Is there a difference in flow? Maybe 26 flows heaps better?

[Ben C34]

Rb25 dude

[Ben C34]

A guy with an rb26 has even modified an rb25 stock manifold to use for his single turbo conversion.

Why would be do that if they are no good?

[Philr32]

A guy with an rb26 has even modified an rb25 stock manifold to use for his single turbo conversion.

Why would be do that if they are no good?

Because it's $50 instead of $1000+

[bcozican]

I ran an rb22 with std exhaust mani and HKS2835 with internal gate on 310 rwkw using 20psi on e42.5 for over 2 years full boost 4000rpm - all on track did over 30 events like it fantastic setup

there are other that have done similar or better

so flow myth debunked, ethanol fuel myth debunked

std mani will do it easy all day every day

[Griffin]

IM the one who modified the 25 manifold for 26. Its booked in for a tune in a few weeks.

[scotty nm35]

Was there much modification required?

What turbo Griffin?

[Dose Pipe Sutututu]

Nothing crazy, 300-350rwkw

stock, gate off housing

[Roy]

No, no porting was done, just a 45mm gate off the housing.

What is so hard to believe? The turbo nozzle is 10 times smaller than the runner diameters all added up, how can the manifold be the restriction. The turbo is the obvious restricted part, but hey, go and stick a .63 rear on for 'response'...

But its how the gases get from the exhaust valve to the turbine that also plays a big part. In the ays of E85 you tend to be able to mask a lot of things but I can tell you in the days of 98 if you wanted the most out of your RB20 or RB25 then a manifold helped. My 2c is whilst std manifolds make the power, you notic a big improvement in how the car drives and makes its power when driving it on the street or flogging its guts at the track.

My other 2c is if you can get a 6 into 2 into 1 manifold then it will work better again vs the 6boost like 6 into 1 manifolds

[Philr32]

But its how the gases get from the exhaust valve to the turbine that also plays a big part. In the ays of E85 you tend to be able to mask a lot of things but I can tell you in the days of 98 if you wanted the most out of your RB20 or RB25 then a manifold helped. My 2c is whilst std manifolds make the power, you notic a big improvement in how the car drives and makes its power when driving it on the street or flogging its guts at the track.

My other 2c is if you can get a 6 into 2 into 1 manifold then it will work better again vs the 6boost like 6 into 1 manifolds

This was pretty much my point

[Philr32]

IM the one who modified the 25 manifold for 26. Its booked in for a tune in a few weeks.

And what was the reason for not going an aftermarket manifold?

[Griffin]

IM runnng a turbo off an underground mine vehicle with watercooled turbine housing with the jacket removed. I spent a day nodding the manifold so cost me nothing. I suggest keeping stock one