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What makes you pick a single or twin setup?

 
Old 01-01-2019, 02:45 PM
  #21  
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Originally Posted by mxmike800 View Post
Yup, Only I would use on3. Another member on here had to do some weird voodoo to get his installed. On3 you just bolt it on and roll out. Most people around here like those massive Borg turbos, but they cost more and eat up a LOT of real estate. For what you want, those large footprint turbos simply aren't necessary.
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Old 01-01-2019, 03:21 PM
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Originally Posted by Game ova View Post
Yup, Only I would use on3. Another member on here had to do some weird voodoo to get his installed. On3 you just bolt it on and roll out. Most people around here like those massive Borg turbos, but they cost more and eat up a LOT of real estate. For what you want, those large footprint turbos simply aren't necessary.

real estate isnt a concern. I got tons of room up here, just dont want to kick myself in the *** or run out of turbo in the long run.
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Old 01-01-2019, 06:18 PM
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As a few others have already mentioned, I'm about to run a twin setup just for fitment. In my application, I don't have room for a 5" downpipe and 2.5" cross over pipe, but I can package two 3" downpipes rather easily. For me, it was between a T6 S480 or twin S362's. I went with the twins and they will still be more than enough for my goal of 800whp and leave plenty on the table if I decide to go further with my 6.0
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Old 01-01-2019, 07:55 PM
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Originally Posted by 01ssreda4 View Post
The fastest cars are single. Plus way less piping. No brainer for me.
Why is it that classes that have weight limits have a higher weight on cars with Twins? Would think the opposite based on your thought that the fastest cars are single.
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Old 01-01-2019, 10:55 PM
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if it's your first scratch build turbo kit, just do a single.
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Old 01-02-2019, 08:54 AM
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Originally Posted by 01ssreda4 View Post
the fastest cars are single. Plus way less piping. No brainer for me.

this^^^^^^^^^^^^^^^^^^
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Old 01-02-2019, 09:18 AM
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Originally Posted by Only ERO's View Post
Why is it that classes that have weight limits have a higher weight on cars with Twins? Would think the opposite based on your thought that the fastest cars are single.
So you have to be THAT guy huh? I knew there would be one. I don't race in classes buddy, but I watch a lot of turbo cars race. Almost all of the fastest, are singles. There's also a reason nitrous is a dying power adder. But that's a discussion for another day.
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Old 01-02-2019, 09:31 AM
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Originally Posted by Game ova View Post
Yup, Only I would use on3. Another member on here had to do some weird voodoo to get his installed. On3 you just bolt it on and roll out. Most people around here like those massive Borg turbos, but they cost more and eat up a LOT of real estate. For what you want, those large footprint turbos simply aren't necessary.
I agree 100%

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Old 01-02-2019, 11:45 AM
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I built two different cars, one was a billet 78/75 and the other is billet gt3582ís. I absolutely hate the exhaust note of the twins, the single 78 sounded orgasmic.

With that being sad my twin turbo car is much faster. However Iím running more boost with better parts in it, but itís also 400# heavier. I like the way the twins look better. If I had it all to do over again Iíd probably go back single.
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Old 01-02-2019, 12:55 PM
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In my humble opinion, a single is much less parts to buy or have fail and less complexity..... in most situations anyways. That’s just my opinion. I chose a single for those reasons. More potential oil leaks too.
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Old 01-02-2019, 01:28 PM
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Originally Posted by 01ssreda4 View Post
The fastest cars are single. Plus way less piping. No brainer for me.
lol no they aren't!

Originally Posted by 01ssreda4 View Post
So you have to be THAT guy huh? I knew there would be one. I don't race in classes buddy, but I watch a lot of turbo cars race. Almost all of the fastest, are singles. There's also a reason nitrous is a dying power adder. But that's a discussion for another day.
Sounds like you need to get out and watch more turbo cars lol. Every actually fast car I see is twin turbo... fastest manual LS, 7 second twin turbo, fastest LS based platform, high 5 second twin turbo, Proline 481X 5 second twin turbo, fastest GTR - twin turbo, fastest lambo - twin turbo, fastest CTSV... twin turbo, fastest Corvette... twin turbo. See a trend yet?
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Old 01-02-2019, 01:35 PM
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Originally Posted by Cwarta View Post
I built two different cars, one was a billet 78/75 and the other is billet gt3582ís. I absolutely hate the exhaust note of the twins, the single 78 sounded orgasmic.

With that being sad my twin turbo car is much faster. However Iím running more boost with better parts in it, but itís also 400# heavier. I like the way the twins look better. If I had it all to do over again Iíd probably go back single.
To me a twin turbo setup should sound cammed at idle and cruise like its NA, at least the ones I've done do. By the time you hear its turbo its too late lol Granted I thought the sound from my 78/75 was muddled, choked up sounding. When I went to the Borg T6 housing it was better but still not open like the twins. So to each their own, some people like the screaming turbo noises all the time... if I want that I'll drive my diesel.
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Old 01-02-2019, 03:54 PM
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Here’s my car idling with a turbo


and without a turbo



single of course. Turbo without cats. No turbo, I had high flow cats.

Last edited by Kfxguy; 01-02-2019 at 04:01 PM.
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Old 01-02-2019, 03:57 PM
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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
Please Stop
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Old 01-02-2019, 04:01 PM
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Performance from twin to single is literally a horse a piece until you get beyond a gt55 based single
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Old 01-02-2019, 04:41 PM
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Originally Posted by SLOW SEDAN View Post
lol no they aren't!



Sounds like you need to get out and watch more turbo cars lol. Every actually fast car I see is twin turbo... fastest manual LS, 7 second twin turbo, fastest LS based platform, high 5 second twin turbo, Proline 481X 5 second twin turbo, fastest GTR - twin turbo, fastest lambo - twin turbo, fastest CTSV... twin turbo, fastest Corvette... twin turbo. See a trend yet?
Theres a million records for this that and the other. And other exceptions like packaging may be easier for twin smaller turbos rather then one big one on rear engine cars like lambos....same kinda goes for vettes. Fastest manual LS has the ******* twins in front of the windshield and worked his *** off to get ahead of the single turbo car that held the record for a while. Come on bro........
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Old 01-02-2019, 04:50 PM
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There's an awful lot of bullshit in this thread.

And the guy just wanted a small power upgrade for his truck. I dont recall him wanting to build the fastest LS powered vehicle in the world lol.
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Old 01-02-2019, 06:00 PM
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Originally Posted by SLOW SEDAN View Post
To me a twin turbo setup should sound cammed at idle and cruise like its NA, at least the ones I've done do. By the time you hear its turbo its too late lol Granted I thought the sound from my 78/75 was muddled, choked up sounding. When I went to the Borg T6 housing it was better but still not open like the twins. So to each their own, some people like the screaming turbo noises all the time... if I want that I'll drive my diesel.

To each there own, I really like the sound of it lol.


my twin car sounds great wot though.

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Old 01-02-2019, 10:12 PM
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This day and age there are so many combinations to compare to. There is RARELY a reason to stress about any of it.

Someone has already done it. Take a combo that fits your budget and goals and run with it.

The days of over complicating things are over.
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Old 01-02-2019, 10:26 PM
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For a 6.0L, personally, I would do a 7675 and be done. It will light off quick, package well, and support decent power. I personally like the Pecision 76GTS (known as the 7675). You can also get cheaper knock off versions of 7675ís or 7875ís. Brand names to look at are Precision, Comp, and Turbonetics.

i made 817rwhp/758rwtq @ 16psi with a Precision 7675 on my stock bottom LS3.

i just had a customer make 776rwhp @ 15psi on a 4th gen LT1 (388ci with Precision 7675).

if you want optimal performance for a single 7675, dump the gate to atmosphere and open up the downpipe as big as you can.
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