why swap two turbos for one?

[SpeedyPete]

Whay do supras insist on getting one turbo instead of two for their motors?

I woulda thought one big one instead of two smaller ones comign in at different stages would be worse:confused:


Iv always fancied swapping my sing T25 for two T28s or something...

[Paul_S13]

Remember Pete Supras have 3000cc to drive 2 turbos, you have only 1800cc, it wouldn't drive too well.

[JC]

Originally posted by SpeedyPete
Whay do supras insist on getting one turbo instead of two for their motors?

I woulda thought one big one instead of two smaller ones comign in at different stages would be worse:confused:


Iv always fancied swapping my sing T25 for two T28s or something...

Bags more power from one huge turbo - good for 0-400m,qtr mile and top speed challenges
More lag and less driveable tho' - crap 'round a circuit

[StreetPizza]

Yeah, a lot of RX-7 owners do that too. You can make a lot of power out of twin turbos too, but there are plenty of good reasons for going single. They are apparently more reliable (less bits to go wrong I suppose) , you get much smoother power/torque curves, and it's much easier to tune aftermarket ECU's to a single turbo setup. You do get a whole lotta lag with a big single turbo though, so it's mostly used for drag setups.

I think that's right, anyway... :)

[andyf]

As strange as it seems, one big turbo is better than two medium turbo's. Dyno figures from the american supra crew back this up. Now when I mean two medium turbo's they are dual, boosting at once, not staged like the stock system. I'm not sure of the reasoning for not engineering a sequential system with bigger twin's, maybe no-one can be bothered spending the extra when they are obviously going for -big- drag-race style power.

[Papa Lazarou]

I think its been covered at length on Skyline and Supra forums. It seems to be swings and roundabouts from what I've read. When comparing say twin "medium" sized turbo's against a large single, from what I read the twins spool up a bit quicker initially, then lull a bit, then really pull hard at the top end. The big single takes longer overall to start but pulls like mad through the mid range, and starts to tail off a bit right at the top. Obviously depends on the exact turbo's and this was just one opinion I read from someone who had tried both setups...

One things for sure two turbo's is always going to be more expensive than one, then you have two wastegates, and two of everything to potentially go wrong..

The most powerful Skylines (1000hp+) tend to run twins though rather than a huge single (like a Turbonetics Y2K or something).