s2000442: Also, did you even bother reading the first post? The OP mentioned driving 120 miles in one sitting 2-3 times a month.

 

I think you misunderstood.

I am talking about the spool time, that means that even if you WOT @7k rpms you will NOT have the same whp as shown on a dyno until the turbo spools which could be several hundred rpm later. there will be a little bit of lag which varys depending on how fast the turbo is already spinning.

 

GMK...this is what you/we are saying...correct?

 

Soul,

Relax, I am sorry about the slow car comment...I know you have a nice setup! and it was nothing personal against you. A well setup turbo system can be reliable but they have gotten a bad rap due to heat issues and people cutting corners on heat management, no oil coolers etc so the SC guys were more reliable. I dont think PTuning is trying to sell their kit in this thread, they dont need to, the quality speaks for itself. They are just trying to educate people that turbos can be a reliable and effective alternative if you would like to track the car.

 

yes exactly.

 

ok let me put my .02 in this. I have have turbo experience from my built civic (gt3076, fast spooling turbo right? and making 450 hp). From what I understand the issue at point is lag. Lets say were getting ready to pull out of a corner and we're at 7000 rpms and at full vacuum, smash the pedal and what happens? depending on which gear, 2nd in this case, I start to pull out at a measly 150 hp, but very quickly I build boost, spin, and under steer like crazy. I have tried to control the boost with my right foot, it's very hard to do with a quick spooling turbo, because at full vacuum and 7000 rpm, it's very hard to get 10 psi out of 24 psi quickly (like in a race or a time attack). What I do is pull out in 3rd, full throttle. It's not the fastest way, but I don't get paid to worry about that.

I have no experience with superchargers, do they exhibit that little bit of lag? Since they run off engine speed, not exhaust pressure, at full vacuum and 7000 rpms, are we seeing 9psi in the charge pipes?

 

No lag, its recirculating or blowing off (which ever system you have) So when you go from vacuum to 7k rpms you get what ever boost you are suppose to see at 7k instantly, or if you give it partial throttle you will see less boost, but its always controlled directly by your foot with no lag and no surprises. The blow off or recirc valve works under vacuum so its instant with what ever the manifold sees, seamless between vacuum/boost. SC runs off a belt tied directly to engine rpm.

If what I'm hearing by some of the member post/salespeople in this thread, we have turbos in the max SC power range of 450-500whp that have no lag and controlled directly by your foot, seamless just like a SC, if this is true then it would be hugely beneficial, these kits however would still be following the characteristics of what makes an SC the natural choice for road racing, and not leading it. Ultimately your suspension and tire set up is going to dictate what you can make use of in the twisties. I run custom widened rpf/weld craft rear 11.5" wheels with 295/17's with Kuhmo XS extreme summer compound tires and I can still induce plenty of over steer and spin with my 375whp/230trq SC. If I threw on some Hooser R comps, I could make use of a 500whp/300trq set up, make it stick and run fast. A 500whp/400trq Turbo with a few unpredictabilities or surprises doesn't sound like the winning approach, but that's just me. We are talking about Turbo/SC in a 2800 or less S2000 after all.

 

Transient response of a turbo will never, EVER match a S/C, unless your piping essentially runs from the turbo to the intake manifold.

/thread.

The power is just not as predictible.

How many RWD turbo sports cars are there in production today? I can think of one: Carrera GT2. Everything else I can think of is considered an exotic. Now look at the AWD turbo sports cars (sti, evo, porsche, to name a few). I wonder why that is.

Even bringing in non-sports cars, I wonder why AMG decides to cap off the torque in some of their beasts....

 

OP...just stay NA

 

I'll make it easy. Road racing with an S2000= SC. Drag racing an S2000= Turbo

thread/