Hey everyone, what are the main differences between a single turbo and twins. Do people tend to prefer one setup over the other?

 

Bro, I know you are a new member but just use the search function. There are literally over 100 threads on this exact question and debate.

 

Ah gotcha. Thanks for the heads up. I’ll start there from now on

 

I like a nice Big Turbo...then again I like Twins too.
Here is a pic of the Twins I like!

 

Cliff notes:
Typically, twins are preferred for originality and transient response.

Single turbos are typically preferred for thermal management, engine simplification (rats nest), and power.

The Borg EFR turbos have really changed things, and now you can have power and transient response with a single, as long as you can afford it.

 

Seriously though,I'd go single..easy to build.
I would like to build "one more car" .It would be another FC with a nice EFR on it..I found the last build to be a little off budget configuring the Exhaust and intercooler pipes.

 

Would dropping in an after market twins like the one Knight Sports offers be a halfway point between the stock turbos and a single turbo kit?

 

I found these just using "Knight sport twins" in TITLES ONLY in the 3rd Gen. Tech section....

https://www.rx7club.com/3rd-generati...sports-648119/
https://www.rx7club.com/3rd-gen-gene...rf420-1106986/
https://www.rx7club.com/3rd-generati...-setup-819262/
https://www.rx7club.com/3rd-generati...pgrade-592209/

 

Thanks for spending the time to search the forum. I've read all the threads before making my last post. None of the threads mention any first hand experience with the Knight Sport turbos after the install.

I'm just wondering if it is worth the effort in getting the KS twins or one is better off going singles...

 

Ok, summary below.

Twins are typically good for 350-360hp max at about 14-16 PSI. You can get more out of them but you will probably need to push the boost further, port the wastegate, run an extended street port, and a few other tricks just to get an extra 20-30hp and that's a big maybe on whether you actually would.

Knight Sports RF420 are probably the best aftermarket twins ever made for this car and as their title says, they should do about 420hp at 14-15 PSI (1 bar). However, they are rare as ****, cost a fortune to buy used, and thus don't waste your time.

BNRs are you other twin option and they can make similar power to the Knight Sports but they have quality issues historically (oil leaking problems mainly), and like the RF420s they are laggier than standard twins.

My car runs twins at 15 PSI and let me tell you it is not slow. Remember, these cars are only like 2,800 lbs so they get going quite quickly. A car on twins at 15 PSI and a good driver will run low 12s, maybe even quicker. You will outrun or keep up with most cars on the road.

Otherwise, above 350-360hp you should just go single but it is costly and never as cheap as you think it will be and you might end up chasing more issues in terms of running the car reliably than if you just kept the car on twins and ran an Apexi ECU.

I am completely happy with my "stock" looking setup and it works great. My SMIC will hold my intake temps under about 48 C after several minutes of WOT and when I use the 250cc/min of water it always keeps my temps in the mid 30s. Water is the way forward rather than worrying about doing a crazy V Mount and cutting your car up and losing nice luxuries like the A/C. Plus, it is way cheaper and keeps your turbos cooler and exhaust temps cooler.

 

Cib24

​​​plz share some details about your water injection system (Type, installation method, pics, if possible). Im interested in seeing the different options that are available without heavily modifying the car. BTW, nice ride (Pic of posted CW)

 

I've started to do more research on this subject awhile back and I originally wanted to keep my future build a twin turbo setup.
After looking into the market more, the newer generation of single turbos most of the time produce less heat, spool faster if not just as fast as twins, and are more efficient.

 

I've had experience with a few 90's Japanese cars with twin turbos (Nissan 300zx, GTR/RB26), and in my experience the twins tend to be less reliable and a lot more of a pain to work on when something goes wrong. Do some searches and you'll find a whole bunch of threads on this topic.

-Austin

 

It's all about money at the end of the day and how much you want to spend and how long you want your car off the road. Plus, how easy you want to be able to pass emissions in lovely So Cal.

 

I too like those twins

 

I think the only time single turbos get a bad rap is that they are often used in highly unreliable high psi builds and a lot of the cars that started off as sequential twins (supra/rx7/etc) are more reliable with the twins than with a giant single turbo bolted on, but like everyone has said in here a conservative single turbo build should be less of a headache than keeping the twins

 

Twins are nice but they break after u put some more boost on it. A lot of people go single because they want more power. Pretty sure the most u can make on twins before they blow is like 350-380hp. Everyone i know that had twins blew it up and just went single and they have 450hp and up. Depends what you really want. People choose single because you'll squeeze more power out of your car

 

I have had both set ups. I prefer a good spooling divided manifold twin wastegate single turbo set up. I have this set up wiyh a pte6262 1ar and love it. Full boost at about 3400 rpm and a little over 400 to the wheels. Simple less heat more power and more reliable. Win win win. Brap on brothers

 

I have had both set ups. I prefer a good spooling divided manifold twin wastegate single turbo set up. I have this set up wiyh a pte6262 1ar and love it. Full boost at about 3400 rpm and a little over 400 to the wheels. Simple less heat more power and more reliable. Win win win. Brap on brothers

 

I was thinking this was the way forward as well. I had a '15 wrx with a twin scroll turbo that would spool from quite low in the rev range. It seems to me that a twin scroll would be perfectly suited to a 13b while improving reliability and reducing complexity.

 

Just be ready if you have this setup from when the two wastegates open and scream