LS-Underdog

Is anyone running the BW S366 (PN 177275) as twins? If so, tell me what you think.... I'm building a 427 LSX with 6 bolt LS7 heads and I just received my turbos...I'm new to turbos, but man they are small compared to my F1R

Blackpanther99

iTrader: (8)

Any HP goals in mind? They seem a lil too small for those cubes but they should work pretty good!

Sarg

iTrader: (6)

With the right ar turbine housing they should be ok...they should be good for 1200+ and spool very quickly. I would have to run the numbers, but that turbo is roughly eqivalent to a gt40r.

Jefro6996

iTrader: (21)

I think I might be going with these turbos on my 408 build. Was planning on using the 66/73 turbo with the billet comp wheel. I know the billet wheel turbos are good for 900hp each.

Sarg

iTrader: (6)

Maybe at certain pressure ratios, but I do not think you would be able to make that on a v8. I could be wrong, but just because a turbo is good for 900 hp on one engine does not necessarily mean it will be good for that on another. Point in case, there are people making 800 at the wheels on a single GT35R turbo on 4 banger, but slap that on a 427 and I would guess it would struggle pretty hard.

Jefro6996

iTrader: (21)

Hopefully, Martin at Tick will see this thread and chime in. He was recommending the twin S366's for my setup.

rotary1307cc

iTrader: (5)

Great combo.

LS-Underdog

Not really....I just have to keep up with my friend that's building a 540 with an F2
I know I'm new to the turbo game, but if a single turbo makes 500 HP on 3.5 liters, shouldn't a pair make ~1000hp on 7.0 liters?

Blackpanther99

iTrader: (8)

You shouldnt have any issues making good darn power with them, as Sarg mentioned "With the right ar turbine housing they should be ok..." They should have no lag at all with your LSeX.

Sarg

iTrader: (6)

Should be fun, but it is going to start to die off a bit up top if you don't size the housing carefully.

Not necessarily. Turbos are more or less efficient at different pressure ratios. Where it could have 76% efficiency at say a pressure ratio of 4 (or 44 psi of boost) it could be at 60% efficiency at say a pressure ratio of 2 (or 14.7 psi of boost). It could even be completely off its map at 14.7 psi. It is all about using the turbo within its efficient range. That being said, twin S366 turbos (love those turbos) will be plenty for around 1200 at the wheels with no issue.

Here is a match that should be pretty close to the S366. It is a 9180 billet wheel, but it will be fairly close still. 17 psi and it is getting close to the edge of the compressor map, but should make some good power! Click the link and it will take you to Borg Warner Matchbot with everything input into it for the most part. It is all to be taken with a grain of salt, but it shows you where it will probably end up on the compressor map at least.

Matchbot 427 twin S366

LS-Underdog

73mm turbine and .91 A/R housing....sound OK?

Sarg

iTrader: (6)

That is kinda what I was thinking....should be a good all around housing. If you want to tailor it more for higher rpms at the expense of spool (which should not be an issue any ways) then go with the 1.00 or 1.10 housings. With the .91 you are going to have around 27 psi of back pressure at 17 psi of boost. 1.10 will drop that down a bit to around 24-25 psi or so as a guestimate. Sorry I can't be more specific, I have not tried these or seen these on a 427. Is the car going to be a auto or manual transmission car?

LS-Underdog

It'll have a glide in it..

Sarg

iTrader: (6)

What do you plan to rev it to?

LS-Underdog

My old car with the Procharger went to 7000 no problem...

Z06_Fan

Dr. Turbo can outfit you with a larger turbine wheel on this turbo if I'm not mistaken. That is if you even need it! On his website, he has a version of this turbo with up to an 81mm turbine but also about 2x the price of the standard S366.

In the right configuration of the entire system, I can't see you making less than 1400 at the wheels. Guys with billet 62mm turbos are making around 1300 with the right complete setup.

Good luck

rotary1307cc

iTrader: (5)

That is the 81/73 turbine

Z06_Fan

Ok, maybe I'm the one confused, but I thought the BW wheel nomenclature was to quote the exhaust wheel's Inducer or the largest part of the blades.

So, for example the most popular FI-68 wheel found in the TC76/78 that everyone used to run here a few years ago was the exhaust wheel exducer of 68mm.

So what you are saying is that the BW wheels are really HUGE ???
Just to set the record straight........

You're saying a 81mm/73mm 0.81 trim wheel is available and some are still recommending a 1.0 ish T4 housing in twins ??????? I must be confused.

BTW, I'm learning here too, so thanks!

p8ntslinger676

Should be a really fun quick spooling setup. we had a c6Z06 with a lsx427 and 61/65 precisions on it a while back and it was a blast. your setup should make 1200 easy with the right exhaust A/R.

jridenour31

Lol Idk what's going on in here with the bigger turbines and a/r. The turbos you have are perfect. ~213 cubes per turbo, you definitely don't need more turbine or a/r.