I would think SC like SOS or very good turbo kit like ptuning thats not to tricked out more conservative. I would just make sure that you don't have vibrations with hard turns and such.

 

That is what i was thinking. That their have been plenty of factory turbo cars that handle just fine.

Also you did not come across at all bias just giving the facts that I am looking for .



Previously when i asked how much more power a SC would have to make to be faster than a TC I was meaning in a straight line..

 

Its not quite as simple as that but all things the same, id say about 25whp, just enough to offset the fatter power curve advantage of the turbo. The SC car will pull harder up top, but its such a small area in the curve.

You guys need to get off the reliability kick and just look at it from a driving performance standpoint in a road course/twisty scenario as the OP is looking at. Turbo lag and a big trq spike doesn't favor a forgiving and predictable handling car running at the limit. I will say again, it is my firm belief the power curve of a Centrifugal will be a more manageable car where its needed in the turns and have the explosive power needed in the straits, the net result is a more balanced, easier managed and faster car. And yes an SC also produces much less heat then a Turbo which will be more prone for reliability problems when pushed at the track. If you want a fast strait line "street" car then get a turbo. Pick the right tool for the job.

 

The debate pops up all the time about whether a turbocharger has too much torque that can cause control issues at the track. The term torque and horsepower are often used as two totally non-related things when they are clearly mathematically joined at the hips. You can't say you want like one and not the other. This really makes no sense if you think about it.

Anyone who says there is too much torque being produced by a turbo system is also saying that there is too much horsepower being made as well. Hopefully you guys get where I'm going with this. To say that a turbo will make too much uncontrollable torque is no different than saying I can't handle the horsepower of a turbo.

Just remember that at the end of the day, you are controlling power, or torque if you will, with your right foot. If a turbo dyno chart shows 300 wtq at say 5000 rpm, then you have the choice of anything between 0-300 wtq at that rpm. Some people are under the impression that a turbocharger will only produce 0 or 300wtq and nothing in between. We know however, that boost, or torque, or horsepower, is controlled by the throttle and that in any type of motorsport throttle modulation is essential for overall speed around a track.

The only exception I can think of would be a turbo SO large that it didn't start making any power until say 6500 rpms (with say an 8000rpm redline) and driving it puts you between everything and nothing in terms of power when you go to shift. Then again, this is a set-up that would be clearly designed for a drag only application.

I know this topic arises all the time so i figure we might as well have a friendly discussion about it here.

- Toan

 

Perhaps I missed it but, IMHO I believe that the one thing that I think that really needs to be discussed is the amount of time from the moment you open the throttle until there is boost and or acceleration (spool time or turbo lag perhaps?). Ideally when you are driving through corners, specifically mid corner, you want to have very good control of that time between the actual throttle movement and boost/acceleration delivery. Having no experience driving a turbo'ed S2000 I can't say, but after spending some time driving a completely stock BMW 335i, my S/C'd S2000 has quite a bit more linear delivery than the 335i.

Brian

 

Ok...it was partially said here...

 

Its all depends if the driver can compensate for the little or big lag. Plenty of great track cars are turbo More power N/A or F/I always makes driving a car harder in the corners. If you think you can handle it then do it

 

Bingo! and the more lag. A 400-500whp SC will give you all the explosive power of a Turbo in the same power range where its needed in the straits, but that Turbo on the S2k to produce those same power levels, would be laggy and peaky. If you want to run a little turbo that is responsive and more predictable to control that's great, but you will be left behind with 300whp. The point is on road racing conditions, the SC has no drawbacks. A turbo car does, if you can work around those then more power to you, anything is possible when the driver is part of the equation.

Bottom line is, when your driving at the limit of adhesion in the corners, you need smooth and predictable power, Turbos sizable enough to be effective in the straits on an s2k are not on that list, its a compromise.

 

I find it requires one hell of a lot of pucker power to get on it much in the twisties.
The straights are a whole different situation where the power can shine.

 

come to think of it...having spent already an insane amount going w/ a FR kit and mostly running in low boost as it's more of a normal linear controllable power amount. I'd say go w/ a greddy kit or something like that and use your extra cash for wheels, tires, brakes, and suspension!