[Single vs twin turbo.]

On 12/08/2021 at 7:05 PM, Dose Pipe Sutututu said:

GTX3576R Gen 2 with 1.01 divided housing, twin scroll manifold, pump as much boost as you want until it stops making power (and not worry about turbines ejecting into the exhaust area or compressor wheels smashing into housings).

Reliable, fast and fun.
 

I am biased.

What were your results with this turbo, if you don’t mind me asking?

[Single vs twin turbo.]

On 12/08/2021 at 6:54 PM, GTSBoy said:

Perhaps that's not the question to ask. For any given power level the single will smack the twins senseless. More response, more area under the curve (from the single). So you could put a "smaller" single on and shoot to max it out at less than 400rwkW (say, aim for 350) and enjoy life a lot more.

No.

See 1.

First question though would be "what fuel?" You can push smaller turbos to more power using E85 than you can on 98. E85 allows higher boost, which causes higher air temps at the same compressor efficiency and pushing the boost higher usually reduces efficiency when you're aiming for the top of the compressor map.

The recommendation will be for a T3 or T4 twin scroll housing and proper divided manifold and wastegate arrangement. Have a look at the various RB25 & 26 turbo upgrade threads stickied on here to see what people are achieving. The options range from GTX3076, through GT3576 or GT3582, to G30-550 or 660, and BW EFRs like the 7670. There's a lot of size difference across those ones I've listed, and not all are available with divided housings, etc. And that's ignoring Precisions and all the off-brand stuff.

Cheers for the great response. After spending countless hours looking for twin turbo stuff I’m pretty new to anything to do with single turbo set ups. 
 

The 400rwkw I sort of just plucked out of the air. But anything in the 350-400 range would be amazing. At these power levels are driveline upgrades needed?
 

The gas will be 98. It’s wildly available here unlike E85. There is also a new fuel supplier offering 100 octane petrol but i haven’t looked into it. 
 

Looks like I will have to reacquaint myself with the dyno thread again. 

[R32 GTR V-spec based in NZ]

Hey guys, I’ve been a long term lurker on this site and finally bought a black V-spec R32 GTR, with the only mods being a cat back and headunit. 
I plan to modify the car to increase performance but with mods that can be taken back to factory if I like. 
A lot of questions are likely to be about part choices at the moment so any help with that stuff would be very much appreciated. 

[Single vs twin turbo.]

Hi there. 
 

I’ve been a long time lurker on this site and finally bought a stock standard R32 GTR. I plan to do bolt on mods that make it perform better but I want to be able to return the car to stock if needed. 
 

Big question at the moment is which turbos to go with. I was pretty set on going with -9 turbos. This is mainly based on stuff I’ve read on this forum over the last couple of years. But I liked the fact they should perform well (300awkw, would make it a very fast car by my standards) and I can keep the engine bay looking factory. 
 

The guys tuning the car think it’s silly to not go single. 
But I have the following concerns. 
1, drivetrain issues. From what I’ve read on here at 300-330awkw the driveline should be pretty safe at that level. I plan to go to a nismo clutch. At 400awkw am I pushing the factory driveline too far and should upgrade it?

2, will the car have to be cut or modified in anyway to fit the single? I don’t want to make any changes that can’t be bolted back to factory if I can avoid it. 
 

3, what turbo would you recommend? Which singles will be similarly responsive as -9 but be able to provide more kw up top?

I know the usual reaction is to mention to search these things but truthfully I’ve spent a crazy amount of time reading up on this stuff and now my wallet if finally about to start being emptied any more info would be very much appreciated. 
 

Also this is likely to be first of a few looking for help choosing parts on this build.