Notices
Forced Induction Superchargers | Turbochargers | Intercoolers

s475 turbine size spool characteristics on mild 4.8

 
Old 11-26-2018, 07:44 PM
  #1  
TECH Veteran
Thread Starter
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,870
Received 2 Likes on 2 Posts
Default s475 turbine size spool characteristics on mild 4.8

So I sold my truck with the big turbine china billet s480/6.0L combo and I'm building something a little less rowdy.

I'm looking at the two VSR small turbine china borg copies. the cast 75mm compressor one is incredibly cheap ~$450 and the billet 80mm is $700

3800 lb truck, 80e 3400 stall, 8.8 w/3.73's 29" stiffwall slick. SBE 4.8, stock 241 heads, 212/220 ~.600 lift on a 114+2

probably do two 450's in the tank again, and my power limit will be my deka 80's

the actual question:

with my power limit being the 80s (maybe 700 wheel on e70?) what do you guys think of the small turbine stuff on a 4.8

truckdoug is offline  
Old 11-26-2018, 07:59 PM
  #2  
Launching!
 
Join Date: Dec 2017
Posts: 295
Likes: 0
Received 0 Likes on 0 Posts
Default

I think the s475 83 turbine would be great. That turbine is really a 75mm turbine if you labeled it like every one else does by exducer. How many success stories you seen with a 7875 on a 4.8. Yours will be a 7575. One detraction will be the 1.10 ar but honestly i went from a .90 to a 1.25 at one point and it spooled the same. I think ar is alot less important then people make it out to be. If anythink it will spool a little later and save the stock short block by not making huge torque too soon.
jordoza is offline  
Old 11-26-2018, 08:05 PM
  #3  
On The Tree
 
Join Date: Jun 2012
Location: Pennsylvania
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default

I know it’s not apples to apples but did you see the 10k shoot out videos on YouTube? Lyle Barnett built a fox body mustang bought a used s475, a little nitrous and a half fillied 5.3 ran 8 something..... it was a full on race car but you get the point..... another guy had a mustang and used deka 80s with race gas and was even faster with a billet 80mm..... you can make big power with a cheap cast s475. If you have time to watch the episodes they give build specs for each car and the last episode they race each other it was pretty cool!
47ford is offline  
Old 11-26-2018, 10:24 PM
  #4  
TECH Veteran
Thread Starter
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,870
Received 2 Likes on 2 Posts
Default

Originally Posted by jordoza View Post
I think the s475 83 turbine would be great. That turbine is really a 75mm turbine if you labeled it like every one else does by exducer. How many success stories you seen with a 7875 on a 4.8. Yours will be a 7575. One detraction will be the 1.10 ar but honestly i went from a .90 to a 1.25 at one point and it spooled the same. I think ar is alot less important then people make it out to be. If anythink it will spool a little later and save the stock short block by not making huge torque too soon.

right? I havent seen a/r make a huge difference.

I do like the borg copies, they have just been a lot more robust and longer lived than the various 7875's we've played with.

Originally Posted by 47ford View Post
I know itís not apples to apples but did you see the 10k shoot out videos on YouTube? Lyle Barnett built a fox body mustang bought a used s475, a little nitrous and a half fillied 5.3 ran 8 something..... it was a full on race car but you get the point..... another guy had a mustang and used deka 80s with race gas and was even faster with a billet 80mm..... you can make big power with a cheap cast s475. If you have time to watch the episodes they give build specs for each car and the last episode they race each other it was pretty cool!
I'll have to check that out. Sounds like my kinda show.
truckdoug is offline  
Old 11-27-2018, 07:04 AM
  #5  
TECH Regular
 
Join Date: May 2015
Posts: 481
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by truckdoug View Post
right? I havent seen a/r make a huge difference.

I do like the borg copies, they have just been a lot more robust and longer lived than the various 7875's we've played with.



I'll have to check that out. Sounds like my kinda show.

I believe it is on Powermotive automedia , called Horsepower Wars. I was drawn into it because Lyle and the Customs by Bigun team are locals to me.
Suncc49 is offline  
Old 11-27-2018, 10:29 AM
  #6  
TECH Veteran
Thread Starter
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,870
Received 2 Likes on 2 Posts
Default

yeah I binge watched the whole season last night. haha

but both turbo teams used big back wheel turbos.

I'm wondering what the spool is like between the big wheel and the little wheel versions on a small cube motor
truckdoug is offline  
Old 11-27-2018, 11:08 AM
  #7  
8 Second Club
iTrader: (31)
 
ls1curt's Avatar
 
Join Date: Jun 2009
Location: CT
Posts: 1,203
Likes: 0
Received 0 Likes on 0 Posts
Default

S475/83 works great on the 4.8s. Quick spool and pushed my 3000lb car to mid 8s @ 159
ls1curt is online now  
Old 11-27-2018, 05:07 PM
  #8  
TECH Veteran
Thread Starter
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,870
Received 2 Likes on 2 Posts
Default

Originally Posted by ls1curt View Post
S475/83 works great on the 4.8s. Quick spool and pushed my 3000lb car to mid 8s @ 159

thats what I wanna hear!

can you give any more specs on your set up?
truckdoug is offline  
Old 11-27-2018, 06:03 PM
  #9  
On The Tree
iTrader: (11)
 
Join Date: Nov 2012
Location: ne ohio
Posts: 140
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by truckdoug View Post
thats what I wanna hear!

can you give any more specs on your set up?
curt has a bad *** notch seen his post when he first got it going didn't even have a cage lol
sbdgbody is offline  
Old 11-28-2018, 03:32 PM
  #10  
8 Second Club
iTrader: (31)
 
ls1curt's Avatar
 
Join Date: Jun 2009
Location: CT
Posts: 1,203
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by truckdoug View Post
thats what I wanna hear!

can you give any more specs on your set up?
gen3 4.8, ljms cam, truck intake, stock heads, s475/83, a2w IC, 3000lb. 26psi. 100 octane plus meth
ls1curt is online now  
Old 11-29-2018, 02:24 PM
  #11  
TECH Fanatic
iTrader: (8)
 
mightyquickz28's Avatar
 
Join Date: Feb 2003
Location: East Chatham, New York
Posts: 1,731
Likes: 0
Received 0 Likes on 0 Posts
Default

Really? So a BW S475 is just a 7575mm? My PT7675 is larger? Then what makes the BW S475 give these fantastic 1/4 MPH I'm seeing? Is it simply the T6 flange?
This has been an interesting thread.
Thanks,

Originally Posted by jordoza View Post
I think the s475 83 turbine would be great. That turbine is really a 75mm turbine if you labeled it like every one else does by exducer. How many success stories you seen with a 7875 on a 4.8. Yours will be a 7575. One detraction will be the 1.10 ar but honestly i went from a .90 to a 1.25 at one point and it spooled the same. I think ar is alot less important then people make it out to be. If anythink it will spool a little later and save the stock short block by not making huge torque too soon.
mightyquickz28 is offline  
Old 11-29-2018, 04:09 PM
  #12  
TECH Veteran
Thread Starter
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,870
Received 2 Likes on 2 Posts
Default

the small back wheel 475 is pretty close in size to the older 75mm turbonetics turbine wheel

the crazy power from s475's and s480s is probably coming from the big back wheel turbos
truckdoug is offline  
Old 11-29-2018, 09:50 PM
  #13  
TECH Fanatic
iTrader: (8)
 
mightyquickz28's Avatar
 
Join Date: Feb 2003
Location: East Chatham, New York
Posts: 1,731
Likes: 0
Received 0 Likes on 0 Posts
Default

I've only seen that term used relatively recently. What does 'big back wheel' refer to? The turbine side or the compressor side?

Originally Posted by truckdoug View Post
the small back wheel 475 is pretty close in size to the older 75mm turbonetics turbine wheel

the crazy power from s475's and s480s is probably coming from the big back wheel turbos
mightyquickz28 is offline  
Old 11-29-2018, 11:45 PM
  #14  
TECH Veteran
Thread Starter
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,870
Received 2 Likes on 2 Posts
Default

yes turbine side. its what the cool kids on sloppy mechanics facebook say when they talk about the 96x88mm turbine
truckdoug is offline  
Old 12-03-2018, 12:06 PM
  #15  
8 Second Club
iTrader: (4)
 
Forcefed86's Avatar
 
Join Date: May 2011
Location: Wichita, KS
Posts: 5,835
Likes: 0
Received 0 Likes on 0 Posts
Default

It's more about the ratio of compressor to exh wheel IMO. A 75mm compressor will spool much quicker than an 80mm compressor with the same "big back exh. wheel". For a single setup, I wouldn't mess with T4's ever again if I didn't have to. The 1.10 or 1.32 T6 S475 will spool easily with a mild 4.8 if the tune and combo are setup properly. I'd go 1.10 T6 if I had a choice, but with the cheap china stuff I don't think that's an option?

I run the 1.32 T6 VSR S480 on my 4.8 and I can spool it semi easily (about 2-3 seconds to 6-7lb lauch boost) at targeted 20lbs 1 sec into the run. Converter is holding me back as it's way too tight. (14 blade stator PTC) Still clicks off 1.3x 60's 5.6-5.7 1/8th mile times and 9 flat at 152ish on 20lbs. That's baby revving it and only 6300 or so thru the traps. Gear and converter change in the works this winter.

Last edited by Forcefed86; 12-03-2018 at 12:12 PM.
Forcefed86 is offline  
Old 12-03-2018, 08:03 PM
  #16  
TECH Fanatic
iTrader: (8)
 
mightyquickz28's Avatar
 
Join Date: Feb 2003
Location: East Chatham, New York
Posts: 1,731
Likes: 0
Received 0 Likes on 0 Posts
Default

I know you have a light car and all but, damn.... that's moving! I'm going to go forward with my twin GT35's for now. May even try one side as the GT35 and the other with the PT7675. But I still have a wandering eye for a S480 every week.
mightyquickz28 is offline  
Old 12-04-2018, 08:10 AM
  #17  
8 Second Club
iTrader: (4)
 
Forcefed86's Avatar
 
Join Date: May 2011
Location: Wichita, KS
Posts: 5,835
Likes: 0
Received 0 Likes on 0 Posts
Default

FWIW, my RX-7 is around 3100lbs, which is heavier than my twin GT35 LS swapped notchback mustang.

You def need a matched pair to run twins correctly. Youíll have all kinda of weird stuff going on if you mismatch the turbos.

Forcefed86 is offline  
 


Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: