S50 S300 bottom mount

[vwmikel]

I've been searching and found no clear answers on this one. I'm trying to decide what combination of manifold and turbine housing would work to bolt the Borg Warner S300 up to the S50. I'd prefer to stay with a cast manifold for reliability and also want to stay with a bottom mount for the usual reasons. The open T4 turbine seems like it would be the likely choice, but I've read that this won't work with the SPA manifold? What exactly interferes?

[rajicase]

I run a boostlogic bottom mount with a Borg Warner S366sxe and had to grind down the block and the compressor cover to get it to fit.

[vwmikel]

Correct me if I'm wrong, but isn't that a tubular manifold?

[rajicase]

Yes.

[BlackPearlZ]

I use steed speed twin scroll with s369sxe

[vwmikel]

I'm looking at the S300SX-E 83S74.

[vollosso]

I doubt it will fit with any of the usual cast manifolds.

Both raj and pearlz have manifolds known for large fitment.

Sidebar, pearlz we need to compare some logs. 369sxe vs 6870. Both twinscrolls..


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[bmw328m52]

running t4 spa mani with prec 62mm. Above subframe piping, stock a/c lines, and intake behind headlight. With most cast manis, I think you're stuck with garret/precision.

[someguy2800]

An S366 is like an inch bigger in every direction than a gt35 or 6262. They are bigger than a gt4094 even.

[rajicase]

An S366 is like an inch bigger in every direction than a gt35 or 6262. They are bigger than a gt4094 even.

It's massive lol

[vwmikel]

Is it the webbing in the block that interferes or is it the compressor housing vs the exhaust manifold? Obviously the latter can be dealt with using a spacer. The former, perhaps using one at the head.

[rajicase]

For me it was the compressor cover interfering with the block. I had to grind the shit out of the block and the cover and it still barely fits.

[vwmikel]

Any chance you have any pictures? Obviously grinding the block isn't my first preference.

[bmw328m52]

I feel like the interest in borgwarners has increased recently. Is it the cost or are there performance gains?

[rajicase]

They perform well, they are probably the most reliable turbo on the market, and they are cheap.

[bmw328m52]

They perform well, they are probably the most reliable turbo on the market, and they are cheap.

Good to know. If my revised ccv and addition of pump for oil drain don't fix my oil in piping issue, then this could be a possibility. Compression is fine so could be turbo seals.

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[someguy2800]

Every manifold has the outlet flange in a different location so just because it doesn't fit with one doesn't mean it won't fit with another. Have to find someone that has tried it.

[vwmikel]

With pictures I was hoping to figure out what needed to be done for fitment. I didn't really want to go tubular for reliability sake. I'm not sure if welding a flange on a cast manifold is a more or less reliable option though.

As far as the interest, I can't really speak for others. I was just looking around and saw the matchbot function which provided more info than I had seen previously. I'm more familiar with Garrett stuff, but after comparing them I certainly see the advantages with the Borg Warner in my instance. I wasn't planning to do a full engine build on this car and was just looking for around 5-600hp while keeping boost response as reasonable as possible. The S300SX-E 83S74 looks like it should be able to make ~20 psi at 3000 RPM which is plenty responsive yet still not go off the map at redline.

[rajicase]

You keep saying you don't want a tubular manifold cause of reliability ? Okay, don't get an eBay manifold and that won't be an issue. My boostlogic has been on at least three engines, had at least 4 different turbos on it, and at least 50k miles, likely more as I am not the original owner.

SPA manifolds crack too.

I have not heard of anyone running a s3xx on a SPA manifold or any cast manifold.

[vwmikel]

You keep saying you don't want a tubular manifold cause of reliability ? Okay, don't get an eBay manifold and that won't be an issue. My boostlogic has been on at least three engines, had at least 4 different turbos on it, and at least 50k miles, likely more as I am not the original owner.

SPA manifolds crack too.

I have not heard of anyone running a s3xx on a SPA manifold or any cast manifold.

I definitely know better than to buy an ebay tubular manifold. If I have to go tubular I'll probably have a friend make it for me and go with a twin scroll (my welding skills are not on par with his). I also want to keep the (working) A/C so that sort of limits how elaborate I can get with the manifold.

I might just have to buy the turbo and see how it fits. Part of me thinks an adapter plate might be a viable solution just to rotate the turbo or to point the inlet more toward the passenger side so the compressor housing clears the block.

[someguy2800]

The way I see it is you can spend a bunch of money on a manifold to run a cheap turbo, or spend a bunch of money on a turbo to run a cheap manifold.

[rajicase]

The way I see it is you can spend a bunch of money on a manifold to run a cheap turbo, or spend a bunch of money on a turbo to run a cheap manifold.

Why can't you have both a good turbo and manifold?

[vwmikel]

The way I see it is you can spend a bunch of money on a manifold to run a cheap turbo, or spend a bunch of money on a turbo to run a cheap manifold.

Every project needs constraints and a budget if you ever hope to see it on the road. The key in my mind is not to over-build the neighborhood so to speak.

[bmw328m52]

Overbuild now, thank us later. Boost is crack

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[vwmikel]

Overbuild now, thank us later. Boost is crack

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This isn't my first rodeo.