S5 stock maniold, external dump

[88turboii]

I have to agree with ted.. it would be better to do this with a S4 manifold, since you are negating the affects of the S5 independent twin scroll. the exhaust pulses mix at your wastgate connection. maybe if you use dual wastegates, one for each line?

[sen2two]

Originally Posted by Max777

Here's the Russian's POV:

with all the money it takes to port te stock wastegate, buy OEM turbo gaskets ($180) and have BNR rebuild your 20yo journal bearing turbine (the S4 stage 4 rebuild is $950)

After all this, you still have a journal bearing turbo, really old design technology, and a cast iron turbo that sits extremely close to the intake manifold.

Why not just get a tubular cast or welded manifold, and a brand new ball bearing turbo that you KNOW will deliver power and be reliable. The price difference is not much, it's new parts...

The twin scroll twins from the FD I can understand, but the FC's stock turbo is just such a piece of junk it seems.

My main reason? I want to run 12.99 (12.50's is a dream goal) or better on the stock turbo, motor, ECU, top mount, ect... Open my hood, and it still looks pretty stock. But now that I got this set-up, I can run 12's for sure. I'll be at the track real soon to make that a whole truth, not an assumption.

Another thing is, the cost of this set-up for me was basically nothing. Just stuff i had laying around. Also, I have built hybrid turbos from the stock turbo for under 200 bucks that are capable of 400whp on a TII. Aftermarket manifolds are easily 200 bucks for a used one, and a nice ball bearing turbo is 1000 and up easily. And you still have to have a custom downpipe, oil feed/return, ect... Get's pricey and complicated for the average person. Hybrid turbos are just so easy, and unless your trying to set records, anything more is just overkill.

Originally Posted by 88turboii

I have to agree with ted.. it would be better to do this with a S4 manifold, since you are negating the affects of the S5 independent twin scroll. the exhaust pulses mix at your wastgate connection. maybe if you use dual wastegates, one for each line?

The s4 manifold would have been easier to do from a fabrication standpoint, but the outcome is still the same. It works, and it works flawlessly. I know this because I have done about 20 pulls on it so far and tested the 2-step numerous times.

Just because something is easier, does not mean it's better. It's usually the other way around. I recommend this to anyone who is having problems holding boost to your shiftpoint or having boost spikes. Forget about porting the wastegate... add an external wastegate to your stock manifold and you'll see how happy you are with it for yourself.

[RETed]

I noticed you're using one of those piece-of-shit Turbonetics wastegates...
Keep an eye on the sleeve that isolates the rod actuator from the diaphram housing.
It tends to get loose and jam the wastegate.
Easy fix is to stake the sleeve into the housing so it doesn't get loose.

Good luck,


-Ted