Now I'v spent the last 20 minutes or so searching for this and I know It MUST be a common question .. but I must be wording the phrases wrong in the search .. so let me apologize for wasting your time..

but could someone explain the benefits of the single over the twins ?

 

1) Simplified
2) More power/flow potential
3) Shall i say more reliable? Depends....

 

ok do you mean more Top end power? or more power period .. say if I'm after a wide powerband rather than top end numbers . would the twins be more efficient then ? or would a single still with a good tune be better?

 

That depends on the turbo. There are smaller turbos that perform very close to the twins with a modest boost in power 4k plus and a loss of 500-1000 rpm of low end. Go with a bigger single for huge gain in top end.

I never had problems with my twins working properly, I killed a set but they still worked.

I just recently switched from twins twins to T04z both running at 14lbs. I was very concerned with the loss of power from 2800-4000. However it's not huge adjustment driving around town. When the power does comes on it's very abrupt and violent. Would not be as easy to track. At the strip the single shines.

I didn't baseline the twins on the dyno, wish I had but can tell you it's significantly more powerful and has a lot of head room for more boost. It's my dd so it's not being pushed at the moment.

 

A t04z or equivalent 67mm turbos is the perfect circuit turbo and is not hard to drive at all.

Once you drive a single, you never go back. The rotary revs out to 8k so you still have a large powerband. I always recommend to do it if your thinking about it.

It completely changes the car and becomes a fierce beast. Don't be scared of the loss of lowend. To answer your question its more power oveall once boost hits. So for example if a t04z gets full b oost at 3800 rpm, its making more power then the twins from there on. Also at some point before that approaching full boost, it should be making more power then the twins as well.

thewird

 

There are plenty of single turbo setups that shine very well at the road course, or even autoX with very broad, predictable power-bands. Sounds like you are running a cast manifold and a 3" exhaust system. I did a stock port healthy engine with our TD61, and it made 24psi by 3400rpms ( 4th gear on the dyno). Very close to stock twin low end, but crazy mid range and top end.

 

I've been tracking my single turbo for some time now (at boost levels up to 20 psi) and love it on track. Nice linear power, perfect for the road race course. Reliable and much less heat production that stock twins.

I never enjoyed sequential twins on a track, the transition is no bueno in a turn.

 

No guys, my turbo sits so low you can't even here it. Boost is low because I don't want to pop it. I just don't have another car. It is laggy below 5k, but I agree it depends on the single choosen and this one was $300.

 

In summary a single turbo system:
- Runs cooler
- Simpler
- Easier to troubleshoot
- Lighter
- More powerful
- Looks better
- Sounds better