What makes you pick a single or twin setup? - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Forced Induction Superchargers | Turbochargers | Intercoolers

What makes you pick a single or twin setup?

 
Old 12-31-2018, 06:42 PM
  #1  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Default What makes you pick a single or twin setup?

im torn, ive been reading for the past few weeks, ive read numerous posts about singles and twins. How do you guys pick? i cant decide which route to go. Seems twins is the cleaner easier piping route, but Hooker also makes a nice turbo manifold crossover setup for twins that looks very stout. I have an LQ4 4l80 combo going into a 87 crew cab long bed dually. ill never tow with the truck, just a weekend cruiser with the old lady. its not a race car but id like to make some power, looking for more low end power rather than making it sing. ive read alot of twin gt45 setups and alot of single borg 400 framed builds.

thanks
mxmike800 is offline  
Old 12-31-2018, 09:34 PM
  #2  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,695
Default

Fitment / cost
JoeNova is offline  
Old 01-01-2019, 12:25 AM
  #3  
TECH Apprentice
iTrader: (6)
 
Lsxford's Avatar
 
Join Date: Nov 2016
Location: Winfield AL
Posts: 377
Default

Originally Posted by JoeNova View Post
Fitment / cost
dead on. Sometimes it is easier to fit say 2 7065s vs 1 s480. But you'll also need 2 gates, double plumbing, and you gotta merge the cold side somehow. If you can fit a single it's the way to go imo
Lsxford is offline  
Old 01-01-2019, 03:41 AM
  #4  
On The Tree
 
Join Date: Dec 2013
Location: North Vanacouver , BC
Posts: 116
Default

I would just pick up a truck log manifold and would run a single small s475 , will spool quick and be fun in a heavy setup since the boost/torque will come on early . Twin GT45s will be dogs and especially for a street cruiser .The S475 will support close to 750 to the wheels and should be more than enough for street use.
Lsx Rubi is offline  
Old 01-01-2019, 05:39 AM
  #5  
9 Second Club
 
Join Date: Nov 2003
Location: Norn Iron
Posts: 12,173
Default

Originally Posted by Lsxford View Post
dead on. Sometimes it is easier to fit say 2 7065s vs 1 s480. But you'll also need 2 gates, double plumbing, and you gotta merge the cold side somehow. If you can fit a single it's the way to go imo
Many with singles run 2 gates, you need to find room for a much larger turbo, sort crossover pipes etc etc

Really neither is much different than the other. Just do whatever is easiest to fit on your car AND easiest for maintenance thereafter.

Some setups with crazy exhaust manifolds were you cant get access to plugs, or wires too close to hot stuff etc etc are just daft. Make life easy for yourself where possible.
stevieturbo is offline  
Old 01-01-2019, 08:29 AM
  #6  
Teching In
 
Join Date: Jun 2016
Posts: 24
Default

I would be interested to see how many have gone through the calculations to determine optimum size and configuration prior to installing something or just bought one or two turbos based on internet chat and just stuck them on there.
squared is offline  
Old 01-01-2019, 10:14 AM
  #7  
Launching!
 
Join Date: Jan 2018
Posts: 279
Default

with single you need manifolds, a crossover and turbine combination that will flow the volume of air that's going to be produced by your combo. cubes, boost, power, fuel type etc etc all come into that. generally that's relatively large and therefore will have a bit of lag. you cant expect a turbo that comes on boost at 3500RPM with (for example 400cubes, 20psi boost) to efficiently flow through the exhaust system efficiently at 7000RPM. however a turbo that comes on boost at 4800RPM most likely will flow efficiently to 7000RPM. as a rough example... T4 76/75 precision on that combo would likely represent something that would be on around 3500RPM and a T6 S488 with 110/96 turbine would likely represent the latter example.


with twins you only need to flow half that amount through each and as such the turbine can be smaller and less laggy. but it is more expensive.

when you're talking big cube, massive power one turbo may not physically flow enough air for the goals and no choice but twins is sensible. but that's at 2500hp plus and 500+cubes
Luke19901 is offline  
Old 01-01-2019, 10:45 AM
  #8  
9 Second Club
 
Join Date: Nov 2003
Location: Norn Iron
Posts: 12,173
Default

Originally Posted by squared View Post
I would be interested to see how many have gone through the calculations to determine optimum size and configuration prior to installing something or just bought one or two turbos based on internet chat and just stuck them on there.

Real world experience is better than some calculations based on hopefully correct info, for the variable that is "optimum"
stevieturbo is offline  
Old 01-01-2019, 11:26 AM
  #9  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Default

Originally Posted by stevieturbo View Post
Real world experience is better than some calculations based on hopefully correct info, for the variable that is "optimum"

i agree.. i like hearing what others have done and what works. a book can tell you how it should or may work.. but thats not always the case. Hence field engineers who sometimes may have never done the actual field work.
mxmike800 is offline  
Old 01-01-2019, 11:28 AM
  #10  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Default

Originally Posted by stevieturbo View Post
Real world experience is better than some calculations based on hopefully correct info, for the variable that is "optimum"
Originally Posted by Lsx Rubi View Post
I would just pick up a truck log manifold and would run a single small s475 , will spool quick and be fun in a heavy setup since the boost/torque will come on early . Twin GT45s will be dogs and especially for a street cruiser .The S475 will support close to 750 to the wheels and should be more than enough for street use.
whats considered a small single 475? 83/87? i would think id want the 1.1 a/r to help with spooling too.
mxmike800 is offline  
Old 01-01-2019, 11:30 AM
  #11  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Default

Originally Posted by Luke19901 View Post
with single you need manifolds, a crossover and turbine combination that will flow the volume of air that's going to be produced by your combo. cubes, boost, power, fuel type etc etc all come into that. generally that's relatively large and therefore will have a bit of lag. you cant expect a turbo that comes on boost at 3500RPM with (for example 400cubes, 20psi boost) to efficiently flow through the exhaust system efficiently at 7000RPM. however a turbo that comes on boost at 4800RPM most likely will flow efficiently to 7000RPM. as a rough example... T4 76/75 precision on that combo would likely represent something that would be on around 3500RPM and a T6 S488 with 110/96 turbine would likely represent the latter example.


with twins you only need to flow half that amount through each and as such the turbine can be smaller and less laggy. but it is more expensive.

when you're talking big cube, massive power one turbo may not physically flow enough air for the goals and no choice but twins is sensible. but that's at 2500hp plus and 500+cubes

yeah not me, i got a basically stock lq4 not a 500 inch race motor. Hooker makes a nice single crossover setup designed for c/10s so that would make my hot side very easy.
mxmike800 is offline  
Old 01-01-2019, 11:33 AM
  #12  
TECH Veteran
iTrader: (21)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,629
Default

if its a six liter, get the big turbine s475 or s480. they light off plenty fast with the bigger cubes
truckdoug is offline  
Old 01-01-2019, 11:36 AM
  #13  
9 Second Club
 
Join Date: Nov 2003
Location: Norn Iron
Posts: 12,173
Default

Originally Posted by mxmike800 View Post
whats considered a small single 475? 83/87? i would think id want the 1.1 a/r to help with spooling too.
What is small depends on what you need it for or expect it to do for you.
stevieturbo is offline  
Old 01-01-2019, 11:56 AM
  #14  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Default

Originally Posted by stevieturbo View Post
What is small depends on what you need it for or expect it to do for you.
drivability, its going to be a weekend cruiser. going in a big heavy truck that has to potential to haul 6 people in it. i want it to light up as low as it can rather than having to wind it up to make the power. im not after a certain HP number but obviously more is better, just thinking going the turbo route is the best bang for buck on making some power.
mxmike800 is offline  
Old 01-01-2019, 12:20 PM
  #15  
Launching!
iTrader: (1)
 
Join Date: Jun 2003
Location: Raleigh, NC
Posts: 289
Default

I built mine (twins) on purely the bragging rights to say "twin turbo".. Lol Sounds trivial but it just sounds cooler then single turbo IMO haha But it was much more expensive in the long run for sure.
vettewreck is offline  
Old 01-01-2019, 12:24 PM
  #16  
TECH Senior Member
iTrader: (96)
 
01ssreda4's Avatar
 
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 24,208
Default

The fastest cars are single. Plus way less piping. No brainer for me.
01ssreda4 is offline  
Old 01-01-2019, 12:35 PM
  #17  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Talking

Originally Posted by 01ssreda4 View Post
The fastest cars are single. Plus way less piping. No brainer for me.
i dont think theres nothing fast about an 87 crew cab long bed dually on 24 rims lol
mxmike800 is offline  
Old 01-01-2019, 12:41 PM
  #18  
9 Second Club
 
Join Date: Nov 2003
Location: Norn Iron
Posts: 12,173
Default

Originally Posted by truckdoug View Post
if its a six liter, get the big turbine s475 or s480. they light off plenty fast with the bigger cubes
Sounds perfectly reasonable, a good 475, biggish turbine would work well. He could go smaller but a big heavy truck should have plenty of load against it so that would help spool anyway
stevieturbo is offline  
Old 01-01-2019, 02:28 PM
  #19  
TECH Addict
 
Game ova's Avatar
 
Join Date: Jul 2015
Posts: 2,654
Default

Sounds like a China 7875 will suit you just fine. Not looking for speed, need fast spool, not looking to wind it up......yup....7875.
Game ova is offline  
Old 01-01-2019, 02:41 PM
  #20  
Teching In
Thread Starter
 
Join Date: Dec 2018
Posts: 15
Default

Originally Posted by Game ova View Post
Sounds like a China 7875 will suit you just fine. Not looking for speed, need fast spool, not looking to wind it up......yup....7875.
like this VS Racing piece?
https://www.ebay.com/itm/VS-RACING-7...frcectupt=true
mxmike800 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: