Single turbo conversion ..

[NismoS-tune]

If I could sell my whole twin setup and go single I would but no one wants my setup.

Ceramic coated and ported -5s, ceramic coated tomei mani/dumps, ceramic coated nismo downpipe, HKS spl piping kit... I'd love to go for an 800hp single but I need to offload the expensive kit I already have.

[cschepp]

^ that's a nice setup though. The mines r34 is stupid quick and responsive. I think it all depends on what you want to use your car for in the long run. My opinion personally.... Twins for time attack and single for drag/drift/show.

[Dragon Humper]

Do you have any idea how many shops are running a big single set up for time attack in Japan right now...


Singles out number twins 2 to 1 right now, they are finally getting it that a big single is just as responsive as 600hp capable twins, weigh less and cost half as much to implement (even though the have a seemingly bottomless money well). Time attack is all about weight and power, singles weigh less and can make the same torque curve as a "proper" set of twins if tuned right.





Jon.

[gtrjon]

There is no lag if your in the correct gear

[dsmart]

I know its fun to talk about and debate but Twins vs Single is nothing more than a pissing contest in my opinion. It seems like the only argument is people feeling the need the justify their own setups. Both can be setup to work great and each have their advantages/disadvantages. The way I see it is that in the past twins were needed because "fast" spooling single turbo's just werent available yet. Now that turbo technology has improved things are trending towards singles as they are able to give the reponse of the smaller twins but the flow of the large single all in a smaller/lighter package. At the end of the day though having options is what its all about and I like the fact that every engine bay is different.

[cortexx]

So i think it's safe to assume after reading everyones points of view that there is no way to say singles or twins are better than each other - there is no winner . At the end of the day it's all about the choice of the turbo itself and other engine mods , tune etc.

From what i read on the net ing eneral and see on here i make the following assumptions :-

1) original OEM turbos have the quickest response with the lowest peak power at higher rpm due to design restrictions (cermic parts)

2) larger twins are a compromise between response and higher end power but in most instances are capable of bringing the fun a bit sooner than a single turbo.

3) A smaller single will has the potential to spool around the same rate as larger twins , but could make a bit more power and is easier to implement and service due to a simpler layout.

4) large singles spool much later and produce the most power .

It's also fair to assume that as manufacturers continuously improve design and materials the efficiency of design will further blur these facts .

The main thing is that my question has been answered - a well chosen single and manifold will be around equal in spool to my tomei twins that start spooling at 3200 and hit peak spool at 4600 rpm . and possibly more peak power .

[Skym]

From what I understand, the difference between twin turbo and single turbo is with the powerband and how the hp comes in. With single turbo the hp comes in (say 100hp jump in hp) around 1000rpm and twin turbo it could be 3000rpm+ to climb 100hp.

I would think twin turbo is better in drag applications due to power coming in gradually thus doesn't upset car and make it go sideways (I gather why HKS used twin turbo on their drag GTR). Same applies to racetrack where you want hp to gradually come in when exiting corners. Combine with 4wd gradually putting torque to front wheels (no wheelspin) and car rockets out of corners.

Compound turbocharging (small turbocharger + big turbocharger) is used to solve boost response (how quick it reaches full boost) problems with bigger turbo's on small capacity engines. It's the best of both worlds with better peak hp (bigger turbo), response, more hp down low (small turbo). The smaller turbo helps to spool up the bigger turbo.