Ratical

iTrader: (82)

Wondering if anyone here is using the 73mm .91 divided T4 housings on their 366's twin setup and on what size engine? Wondering if they would be too big for a 6.0 spinning to 7k?

oscs

iTrader: (19)

Absolutely not

slowlsx

iTrader: (28)

got guys with 76's on 6.0's lol 66's definitely is not too big. building a 370 with billet sxe 366's same housings.

Ratical

iTrader: (82)

Just so everyone read this correctly, I am talking about the 73mm .91 housings more than I am the 66mm compressor wheel.

oscs

iTrader: (19)

Doesn't matter. My 66/65's spool almost to quickly on my car. A 73mm and .91 should be fine so long as the car is auto

Orr89rocz

iTrader: (13)

Turbine size does matter but it will spool it. Its a bigger than necessary turbine for 1000 hp and under but idk what your goals are. Atleast the backpressure should be little concern. I'd expect them to make boost around 3600 and really move by 4000-4200 rpm. Get the converter to stall in that range to help if an auto car.

If building headers take advantage of the divided housing. Build a 4-2-1 header and match the right cylinders to each half of the divided and it will light off very quick

oscs

iTrader: (19)

Obviously. I'm saying that a 73mm wheel with a .91 isn't going to be an "issue" and should spool just fine under an auto.

toytech93

iTrader: (2)

I also currently have a 65mm turbine and was unsure about the jump to the BW 73 turbine. It seems like a big jump anyways, 8mm. Also the switch from garrett to BW wheel, I was unsure. I would like to hear what jose and lil john have to say.....

silver_82

Ive used the cast 66mm big turbine wheel with an open .88 with a 5.3. Its got some lag. Converter plays a big part. Ive got 2 diff converters 1 will spool up to 13psi in 2 secs the other takes 5. This is from an idle on the transbrake.

These units make pretty good power. If you dont want at least 1000hp then get a smaller pair

3pedals

iTrader: (3)

I am concerned about this too, so I ordered some Stainless .70 a/r turbine housings from Bullseye power.
Bullseye told me these will get the s366/73's to light up by 3500, and will still flow enough to allow 1200hp

stevieturbo

3500rpm under what conditions ?

If I do a pull in a high gear I can make say 15psi a little over 3200rpm. Not really representative of normal use though.

In say 3rd gear, simply because the car accelerates faster than load is applied boost threshold is higher more typically around 4-4200rpm for same boost. 2nd gear it would be higher etc.

I cant see any of the factory T4 housings ever posing a restriction to the 366.

On my 364FMW's with the smaller 68mm turbine, under almost all conditions, certainly below 22-24psi I'm around 1:1 EGBP vs Boost
It's only above that boost and say 5500rpm PR rises a little above 1:1

3pedals

iTrader: (3)

Interesting,
I have not run s366 twins yet, but my car is a street/strip 5 speed, and I am concerned with boost threshold being too high.
I was told that with the.91 housings boost threshold would be aprox 42-4500rpm, and that if I wanted it down ~3500 that I needed slightly tighter ex housings. So I ordered the SS.70a/r (T3)housings. They are in the mail right now, hope to have the twin turbo conversion done for april

stevieturbo

http://www.agpturbo.com/blog/the-bor...n-inside-look/

stangeater01

iTrader: (125)

Aren't thoes what the s10 that holds the record for fastest sbe 5.3 runs?

LJMSJohn

We've ran them on 5.3's before.... I wouldn't hesitate to put a 73/.91 S366 on a 6.0.

spray280

iTrader: (5)

I've ran them on a 5.3 with a LJMS st2 cam. A little laggy but no problems spooling
on the transbrake. Now running on my rod/piston 6.0 w/LJMS st4 cam. Spool is
almost instant on the street. My tune needs work but have made 10psi on the brake
easily.

Ratical

iTrader: (82)

Awesome feedback from everyone. Sounds like I am going to give the out of the box 66/73's a try!

stangeater01

iTrader: (125)

Is this just a off shelf cam? I'm running a 5.3 with the 366s but plan on doing a forged 370 in future and would like to buy parts once, you think I should put a stage 4 in my 5.3 till my 370 is built and switch it over

spray280

iTrader: (5)

Yes, just his shelf cam. Biggest I've seen/read in a 5.3 is his st3 turbo cam.
Give him a call, He'll get you squared away.