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

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

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.

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.

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.

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

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.

whats considered a small single 475? 83/87? i would think id want the 1.1 a/r to help with spooling too.

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.

if its a six liter, get the big turbine s475 or s480. they light off plenty fast with the bigger cubes

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.

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.

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

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

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

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.

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.

if it's your first scratch build turbo kit, just do a single.

this^^^^^^^^^^^^^^^^^^

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.

I agree 100%

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?

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.

Please Stop

Performance from twin to single is literally a horse a piece until you get beyond a gt55 based single

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 fucking twins in front of the windshield and worked his ass off to get ahead of the single turbo car that held the record for a while. Come on bro........

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.

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.

If you want realistic longevity and reliability, stay away from the name brand precision. They make the power, but are definitely lacking stamina.

What fun is an early morning at work without a little friendly bickering :secret2:

True, gotta do something at work.

So I give you 7 twin turbo records and you cant provide one single turbo record?

And whatever that blue Camaro worked way longer at trying to be fast and was never consistent, shit would run great one pass and either blow up or run slow the next pass. Least the vette makes a shitty pass and still runs 8's and he built the car and set the record in about a year. Probably why the Camaro is for sale realized he cant be consistent, damn thing never even went straight whoever buys it needs to take it to a chassis guy or something.

Talking about this car? This stunt he pulled looks cool and all, but he got VERY lucky. Surprised he hasn't wrecked it yet.
Not really into the car, but I admit, this pass looked nice.

He didn't build the car, he barely worked on it, and he has WAY more money in it than Ray had in his Camaro.
That being said, twins are going to be faster. The reason everyone sees singles as faster is usually because of class rules. A lot of Street and Outlaw classes only allowed singles for years. Guys started getting deep into the 7s on a single 76mm. 1/8th saw them creep super far down into the 4s with a larger turbo.

Twins will always have more power potential, but we're talking about abnormal circumstances. For basically any 'street' sized twins, there will be a single out there able to make more power. Its only beyond that point that it becomes apparent, twins have more potential.

That's the one.

I doubt he has any of his own actual money into the vette, considering most of the parts are provided via advertising and he makes money every time he starts the car on video. I'm sure Ray got some hookups along the way as well, pretty sure Monster was shipping him clutches regularly and texasspeed helped with the engine. Either way for what started as a basic LS setup with 6766 turbos its pretty impressive he went 7's with a manual. Could care less about the body panel, gokart blah blah blah debate. If it were easy more people would be doing it, and I don't see many even try.

Single vs twin comes down to price point as well, the singles that can make big power are $4k+. When you can get $1500-2000 worth of twins and make good power its appealing to some people on a budget, they can then use that money to build an engine that can handle it. I'm sure the people spending $4k+ on a turbo aren't worried about what the engine invoice is going to be.

True. That's why my first reply to this was fitment/cost.
Anything below 1500 horsepower is a complete toss-up now that companies like VS and On3 have 88+mm billet clones you can get for less than a grand.
For anyone who doesn't mind china turbos, budget almost gets tossed out in favor of fitment.

-I had tons of room under the hood of my Nova, so I went billet S475 (now S480). Finished the entire turbo setup for $1800 from the compressor inlet to the downpipe.
-I fabricated a twin setup for an S10 I was helping build. With truck accessories, he had to trim his fan shroud for the threaded snout of the water pump pulley to clear.
He also wanted to keep inner fenders. A single wasn't an option, not even a 7875. I managed to fit a pair of tiny 50mm T3 turbos under the hood with 3" downpipes. It runs mid 10s with a T56 at 3600 lbs cutting 1.4x 60'.
Total budget for this one with stock manifolds, piping, intercooler, twins was only $800.
-I had unlimited space on my corvette. No hood, no fenders, no bumpers, no restrictions. The quad turbo setup with custom manifolds, 4 T3 turbos, intercooler and piping, oil feed/return lines was all just $1500.
Fitment being the sole deciding factor in each of them. Budget is becoming less of an issue. None of the turbos are chosen based on power potential since they're all more than capable of the original goals.

For things like 99-07 silverados/sierras just wanting a mild bump in power, I usually do small twins so I can bolt the downpipes directly to the factory Y-pipe for an easy and clean install. Factory manifolds with 2.5" 14 gauge tubing and OBX 2.5" round to T3 or T4 transition flanges, and a few pieces of 3" J bends with new stock manifold flanges makes getting the turbos and hotside bolted in take ~4 hours with room to spare.

Your posts are sad

So you just automatically take a Billy badass ball bearing gt55 unit and want to compare to it to a set of plain jane journal bearing twins


Excellent logic


You can be into a journal bearing gt55 for under 3k


Want to compare to a fancy ball bearing gt55 you better be comparing with a pair of fancy gen 2 ball bearing 6870s or 7675s or Garrett gen 2 gtx4202s

Did someone say twin PTE 6870s and 40psi.

https://cimg9.ibsrv.net/gimg/ls1tech...49a0a1c94c.jpg

Lol this thread has gone to shit like most turbo suggestions threads. The guy has a 6000lb dually and wants a responsive setup for a fun street driver . He's not planning to run 6s or 7s anytime soon .

Why do you care at all about the body panels? Just doing my part to derail this thread even further. Or should it be farther?

You're new to the internet aren't ya fella?

Your life is sad! You missed the point again, as usual.

Try to keep up... read what I said. I clearly said I don't care about the body panels unlike so many people that comment on youtube and facebook that use them as an argument with his times.


lol obviously he is, people take this shit way too seriously which makes me laugh.

Really. You may have said it but that is not what you typed.

You don't pickup on sarcasm do you? I forgot its LS1TECH, where everyone goes to brush up on English 301 rather than post anything informative. In this case for the delinquents... could care less, aka don't give a shit aka not a concern of mine aka don't fucking care how many body panels its missing when it beat the race cars lol

I can cosign this, but don't forget that I am going to GAPTIZE you here in the spring. :drive:. This car stuff is just fun guys.....quit being so serious.

I've had both, and prefer twins. The single had a lot of backpressure... however I can't fairly compare because when I changed to twins I also changed from auto to manual. The single with auto would boost from a dig - perfect for a truck. I would think the twins would also boost from a dig with an auto (they're small enough), but never got to try it. Manual and turbos = lag regardless of single or twin if you drive normally then jump on it from lower than boost rpms (ignoring the drag setups).

Both get the job done, it's just preference or budget or what you can physically fit. A single can match the top end of twins or the bottom end (if sized accordingly for one or the other).

Where twins seems to be better is they will normally offer a fatter power curve for the same top end (according to all apples to apples tests I have seen), but no doubt there's exceptions. Logically, less backpressure = free power somewhere

What's another year of waiting for you to catch up, lol!

I don't disagree, but in internet forum world oftentimes the weight of someone's opinion is judged not by the amount of experience, but the number of posts. There's enough info available to do some initial sizing based on online info from the manufacturers and tools like matchbot to at least get you in the ball park.