exhaust housing size

blackcloudpsd03 · Sep 20, 2014

What would be the best exhaust housing size to run on a s366? With 160/80's I Dont want a lot of bp. I Dont tow super heavy. Maybe 5k at most. Do they make a 1.01 for the 366?

With 160/80 will it have a choppy idle? If so will a hpo cross over pipe help it or is that in the tunes?

blackcloudpsd03 · Sep 20, 2014

1.10 *** and while were on that topic does the blade count really make that big of a difference. 5,6,7,10,11? Or is the basb a better choice then a s366

Swaan · Sep 21, 2014

You want to run the .91 housing that the turbo comes with.
Trust me!!
I ran 175/80 with a s366 with the .91. You don't need a wastegate.

The s366 has a lot bigger turbine then the basb so you don't want to run anything bigger the the .91

If you do it will be very laggy and not come on to boost till after 2000 rpm. No good.

jeremiahmercier · Sep 21, 2014

Swaan said:
You want to run the .91 housing that the turbo comes with.
Trust me!!
I ran 175/80 with a s366 with the .91. You don't need a wastegate.

The s366 has a lot bigger turbine then the basb so you don't want to run anything bigger the the .91

If you do it will be very laggy and not come on to boost till after 2000 rpm. No good.

That's where I get confused, the turbine side, I guess I don't understand when a larger turbine wheel should and shouldn't be used. It seems like the BASB uses backwards theory for flow and spool. On most tuurbos, you want a tighter housing to the turbine wheel for spool, but that also equates to higher drive pressure. On the BASB, they use a larger a/r housing around a much smaller wheel, ... I guess I don't understand how it spools faster, other than smaller is easier to turn. So wouldn't the basb spool even faster with a tighter housing? I guess, if whatever Pius is doing for this turbo, why isn't his concept used more often, it's a smaller Inducer compressor, a smaller turbine, and a bigger housing, which other than the bigger housing, you would think that the basb would move less air, and spool slower because of the larger housing, yet the basb is rated at a higher volume of air moved and spools very quick. ??????????????????????

gnxtc2 · Sep 21, 2014

BASB = top secret :evil

Billy T.
[email protected]

Swaan · Sep 21, 2014

jeremiahmercier said:
That's where I get confused, the turbine side, I guess I don't understand when a larger turbine wheel should and shouldn't be used. It seems like the BASB uses backwards theory for flow and spool. On most tuurbos, you want a tighter housing to the turbine wheel for spool, but that also equates to higher drive pressure. On the BASB, they use a larger a/r housing around a much smaller wheel, ... I guess I don't understand how it spools faster, other than smaller is easier to turn. So wouldn't the basb spool even faster with a tighter housing? I guess, if whatever Pius is doing for this turbo, why isn't his concept used more often, it's a smaller Inducer compressor, a smaller turbine, and a bigger housing, which other than the bigger housing, you would think that the basb would move less air, and spool slower because of the larger housing, yet the basb is rated at a higher volume of air moved and spools very quick. ??????????????????????

The turbine and compressor have to be matched to work properly.

The larger the compressor the bigger the turbine.
This is why when you order a box s366 it comes with a 73-80 turbine.
Generally a 62-64mm compressor will use a 68-76 turbine.
Now this is where it gets tricky. Generally it's the turbine size that has the biggest effect on spool up with the size of compressor wheel coming in second.
Once you got the wheel sizes specs figured out for you application you then fine tune it with the a/r size of the turbine housing.

Now there is a lot of different combinations you can play with, the trick is to get everything working together for you horsepower goals,rpm range and cubic inch displacement.

It's a bit of a science to get it correct.

The biggest mistake I see everybody make is going to big with turbo size.

blackcloudpsd03 · Sep 22, 2014

Now what about a 66/73/.91 I take it the general concensious is the 366 is a better charger? How I'd you like the 175/80's with the 366? Was it a fun set up? I've said this with every truck I ever owned. I Dont want to build it.. Lmao and it fails every time. Then line between enough and never enough never ends.lol

So what about compressor blade count? If they made the fmw s467.7 in a s300 frame I'd run that thing. I'm not a huge fan of beating firewalls to make a larger turbo fit into its new home.. I do like the gt42 but for right now a 366 will do fine

gnxtc2 · Sep 23, 2014

The 366 is a better charger than what?

Billy T.
[email protected]

m j · Sep 23, 2014

blackcloudpsd03 said:
So what about compressor blade count? If they made the fmw s467.7 in a s300 frame I'd run that thing. I'm not a huge fan of beating firewalls to make a larger turbo fit into its new home.. I do like the gt42 but for right now a 366 will do fine

where does the firewall get beat to fit an s467? the downpipe on an OBS is about the only hard to fit spot but I thought you SD guys had it easier in that regard

Swaan · Sep 23, 2014

blackcloudpsd03 said:
Now what about a 66/73/.91 I take it the general concensious is the 366 is a better charger? How I'd you like the 175/80's with the 366? Was it a fun set up? I've said this with every truck I ever owned. I Dont want to build it.. Lmao and it fails every time. Then line between enough and never enough never ends.lol

So what about compressor blade count? If they made the fmw s467.7 in a s300 frame I'd run that thing. I'm not a huge fan of beating firewalls to make a larger turbo fit into its new home.. I do like the gt42 but for right now a 366 will do fine

The 66/73/91 is a box Borg warner s366. They work great on a 7.3 with 175/80 injectors. Spool up was okay. It towed fine, had great top end!!

But if your gonna stay at a stg 2 level injector 160/80, or 175/80. And if you tow a lot. A s300 turbo in the 64 mm range with a 68/76 turbine will spool sooner and keep egts cooler in the lower rpm range.
I've had both chargers , and yes the 366 pulls harder 2500 rpm and up.

But if you want a fun street truck that pulls really hard in the upper rpm range a 66 mm s3oo with the bigger 74/80 turbine is better. And can still tow just have to keep the rpm up 200-300 higher.

Now if your thinking of going diffrent injectors like hybrids then this does not apply.

I've talked to reed at works turbochargers and they can put an aftermarket 67.7 mm compressor wheel in a s300.
Something like that they would just take a box s366 and machine out the cover to accept the bigger wheel.

blackcloudpsd03 · Sep 23, 2014

Swaan said:
The 66/73/91 is a box Borg warner s366. They work great on a 7.3 with 175/80 injectors. Spool up was okay. It towed fine, had great top end!!

But if your gonna stay at a stg 2 level injector 160/80, or 175/80. And if you tow a lot. A s300 turbo in the 64 mm range with a 68/76 turbine will spool sooner and keep egts cooler in the lower rpm range.
I've had both chargers , and yes the 366 pulls harder 2500 rpm and up.

But if you want a fun street truck that pulls really hard in the upper rpm range a 66 mm s3oo with the bigger 74/80 turbine is better. And can still tow just have to keep the rpm up 200-300 higher.

Now if your thinking of going diffrent injectors like hybrids then this does not apply.

I've talked to reed at works turbochargers and they can put an aftermarket 67.7 mm compressor wheel in a s300.
Something like that they would just take a box s366 and machine out the cover to accept the bigger wheel.

That doesn't make sense to me lol I was always told smaller thee turbine and housing faster the spool .. Higher drive pressure and hotter. Egts? No I won't be towing heavy maybe 5k at most. Why doesn't that rule of thumb apply to hybrids?

blackcloudpsd03 · Sep 23, 2014

I read some where that larger framed turbos like the s400's and the gt4294 the fire wall needed to be messaged to get it to fit into its new home not to mention that custom down pipe that has to be made. Or does some one actually make one?

And I was comparing the basb and the 366. As to what one is better. Are there any install pics of a s400 in its home? I found gt4294's

blackcloudpsd03 · Sep 23, 2014

m j said:
where does the firewall get beat to fit an s467? the downpipe on an OBS is about the only hard to fit spot but I thought you SD guys had it easier in that regard

You sir have obviously never tried to fit a 4in down pipe in its home on a non vgt 6.0 it doesn't work .. Lmao I made swiss cheese of it and had to get a new 3.5 dp

Swaan · Sep 23, 2014

blackcloudpsd03 said:
That doesn't make sense to me lol I was always told smaller thee turbine and housing faster the spool .. Higher drive pressure and hotter. Egts? No I won't be towing heavy maybe 5k at most. Why doesn't that rule of thumb apply to hybrids?

Well that's sorta correct , but we are comparing a 366 and a smaller s364

The smaller s364 is going to spool sooner in the lower rpm range. So if your cruising down the hwy at 1600-1700 rpm towing,the smaller turbo is going to be in its sweet spot. It's going to have more boost at that rpm then the bigger s366. Therefore cooler egts. Drive pressures are not a problem at that rpm. In fact , with the right housing drive pressures should not be a problem at all.

The s366 does not come on top till 2000 rpm or so.

gnxtc2 · Sep 23, 2014

What Swaan says is true. But you also have to take into account how the truck is going to be used, the rear gear ratio and your cruising rpm.

I have 285 tires, 3.55 gears and tow around 70 MPH which puts me around 1850 rpms. The rest of the build up is in the sig. I went with a BASB turbo. Have the slightest clue what the specs are but it does 1.10 exhaust housing.

In my Economy tune, I can hit 35lbs effortlessly, cruise in the 0-10lb range with EGTS under 1000. I was towing around 5k in my Economy tune and it was very hard to break 1000°. I towed also 21k in my Heavy Tow tune. The BASB was in the 10-25lb range. The rolling hills boost was 20-25lbs. This was at 1850rpm with the cruise set @ 70.

My truck hardly ever sees over 2000 rpms unless I'm pulling a long steep grade towing the enclosed trailer. Couldn't be happier with the BASB.

Billy T.
[email protected]

blackcloudpsd03 · Sep 23, 2014

Its got either 275's or 285's and 4.10's spooling shouldn't be a problem with that raito. You can also get the larger wheel in the 64. You can get a 64/68/ or a 64/71. If that's the case you might a well do a fmw 64.5 spools like a 64 flows more air then a 366 top end.. What size is the stock turbo on a obs? I've always liked to go a little bigger on the charger so I have room for more fuel. So I Dont have to buy 2 different set ups ever few years or so. You Dont hear many guys running a 64mm on the 7.3 they run 66 or larger. A set of 175/80's wouldn't be too hot for that turbo? I've ran a 64 non vgt on my 6.0 before stock injs pulling wot my egts won't peak past 1025° even when I ha 190/100's it would go to 1250ish

blackcloudpsd03 · Sep 23, 2014

gnxtc2 said:
What Swaan says is true. But you also have to take into account how the truck is going to be used, the rear gear ratio and your cruising rpm.

I have 285 tires, 3.55 gears and tow around 70 MPH which puts me around 1850 rpms. The rest of the build up is in the sig. I went with a BASB turbo. Have the slightest clue what the specs are but it does 1.10 exhaust housing.

In my Economy tune, I can hit 35lbs effortlessly, cruise in the 0-10lb range with EGTS under 1000. I was towing around 5k in my Economy tune and it was very hard to break 1000°. I towed also 21k in my Heavy Tow tune. The BASB was in the 10-25lb range. The rolling hills boost was 20-25lbs. This was at 1850rpm with the cruise set @ 70.

My truck hardly ever sees over 2000 rpms unless I'm pulling a long steep grade towing the enclosed trailer. Couldn't be happier with the BASB.

Billy T.
[email protected]

How much power did your set up put down? Do you still get decient fuel milage? Right now around town it gets 18-19. I'm pleased. Im parking the 6.0 at best I get 13.5 lol 8.9 when I had 37's

Swaan · Sep 23, 2014

I'm running a 64.5 fmw with a 68/76 turbine and 1.00 A/R housing.
I'm perty sure it's almost exactly what a basb bell turbo is.

I have similar results towing like gnxct2 . Works good!!

blackcloudpsd03 · Sep 24, 2014

Swann where did you pick yours up from? Now do any of these turbos we have been talking about need to be gated? Reguardless if its the fmw or s366 or basb? Hm I have some deciding to do..