I hate this particular argument but guess i'm bored this morning.

This is true, you have to use the upper rpms to get all the benefits of a centrifugal. But out of the box, the comptech is quicker overall. The greddy just doesn’t have the excitement in breathing that the comptech kit does. But its pure taste, if you like the s2000 high revving stock engine characteristics, then you will appreciate sc more. If you’re a bit of a lazy shifter and like the power curve more inline with a v6 or 8 then a quick spooling turbo is probably appreciated more. The thing to remember though, is the greddy kit maxes out at the trq and hp level that a NV1000 Comptech kit does at about 9psi, it just doesn’t touch the overall performance availability. 330hp/230trq max vs 400+/250trq.

 

Very good information!

So turbo for power down low and SC for power up high would be the simple way to put it?

Is it true that i wouldnt notice the SC gains until 5K RPM?


Another quick one:
I have ready that a SC is more reliable than a Turbo, not sure of all the reasons quite yet but what would be the worst case scenario while running a SC? What is the worst possible thing that could go wrong?

 

Hmm, a rebuild is $400 for the sc, but of course you can still drive the car with it off

I heard one person loses an engine due to no tuning over a long period of time. He just didn't have a wideband and never bothered with his afr's

The FPR Are a problem for people sometimes.

Stock Clutch can go out?

I don't know. The setup is pretty reliable as long as you take the precautions.

 

The base Comptech or SOS kit is stupid reliable long term, as long as your not a knuckle head. Yes setting your afr to safe levels is the biggest thing with these kits, but its simple to do yourself, assuming you were smart and have installed a wideband, a boost gauge is an inexpensive and very practical unit to have for trouble shooting and reference as well. People who have issues with these kits, didn't take the minimal amount of effort to insure the reliability I just mentioned.

All Greddy manifolds crack...eventually, bolts back out from vibration like many top side turbos, there is more complicated tuning required to be running safe and efficient which requires timing adjustments, which then require a tuner.

Am I biased? yeah quite a bit, and its for good reason. Ive got SC and turbo friends as well as my own SC experience, it has given me a broad scope of what issues vs benefits there are to both.

 

Would this be the wrong time to ask what a wideband 02 sensor does? lol

 

Depends on what you consider notice? The biggest felt impact is at vtec change over with a base psi kit. But you start making positive pressure at about 3k rpm. Lowering vtec down in the 4k rpm range really helps your mid range power with these sc kits. In comparison to a greddy kit there is no comparison in this rpm range, the trq curve is abrupt and will sling you back, but quickly signs off where the sc kit starts getting into its stride. The power band between the two are shifted far apart. tThere are some dyno graphs floating around, be great if someone would post the base 6psi greddy against the 6psi CT kit. Max trq with the greddy is like 3-4k rpm. On an SC its near redline.

 

Searched around and found these... Not sure of all the details like mods or PSI but a decent comparison.

CT SC


Greddy Turbo


So yea i now understand what you are referring too

In my opinion id rather go with the SC kit after reviewing where the power is. Like you said i could always drop the Vtec a bit. Would a different gear setup be a good idea for a SC setup as well?


Very happy there are members around willing to spread their knowladge! Can't thank everyone enough for all the information so far, just makes me want to SC my car now!

 

Now what gear or gears is a car in when running on a dyno?

 

No problem

4th gear is closest to 1:1 which is what you typically dyno in.

The first graph is a typical maxed out 13-15psi Comptech kit.

The second graph looks like a base 5-7psi Comptech kit overlaid with a near maxed out 10-12psi Greddy kit. It gives you a general idea, the greddy is a broader/fatter power band, but at its full potential its not a great comparison to a Comptech at a base boost level. A better comparison would be to overlay the first Comptech dyno and see where the trq/hp lines intersect. Any software guys out there?

 

So with the turbo Tq being down low you are missing out on most of that power after you get off the line right? between shift points for RPM's don't drop a whole lot. Or is there a secret to dealing with this issue?

I plan to do some track events and will be from 5K-8K amost of the time.