The blower sounds awesome, that whistle is part of the fun, but its not loud enough! The BOV dumping air is all you hear when you let off the gas, and the exhaust drowns out the blower when on throttle, so blower sounds is rather moot. Never understood why people based anything on that. You want to hear a loud blower sound, put a roots system sc on the car!

 

 

Driveability is all in the tune. Also, I don't believe that the Rotrex blowers make more low end power. 2psi is 2psi is 2psi, as is any other load amount. Doesn't matter how the engine is seeing boost, the same level of boost is gonna yield the same results on a specific engine. So if both setups are identical, making the same peak boost, the boost curve is gonna be linear due to the nature of a centrifugal blower, so if they both make 8psi at 6k rpms, I dont see how the KW kit is going to yield more power than the SOS kit making the same amount of boost at the same rpm. Unless the Rotrex blower runs cooler due to the FMIC vs the Aftercooler. I haven't seen any dyno results proving this claim thats been on the forums for years either, so I wont hold my breath about Rotrex > Paxton for low end / midrange power.

Cogged belt is appeasing, as my SOS stage 2 kit slips in 1st and 2nd gear, so I never really see the full power amount unless I'm in 3rd gear or higher. I guess it would be nice to see that power? But then again, I can't hold traction as it is in those gears anyways, so kind of a moot point.

Blower sound is awesome, I have the synchronic BOV by snyapse on the stock 1" port, and it's too quiet, and I'm at 12psi and 411whp. I need to install a Tial with a flange welded to it pronto.

It will drive like stock, but with better pedal response, as in it will take less pedal mashing to achieve higher loads, 90% of your daily driving will be in vacuum still, but 0psi (WOT for an N/A motor) comes at like ~40% throttle rather than 100% throttle. I hope that makes sense.

 

I agree with the post above. My old tuner overlayed his KWv1 dyno plot with my old 1220SL about 7 years ago and HP and torque differences were minimal at similar boost levels. Back then, some ppl said KW had a torque curve similar to turbo, lol.

 

https://www.s2ki.com/s2000/topic/113...-91-sos-n1200/



a comparision done by one of the members a while back, very informative

 

For Reference:



If anything, it looks like the Rotrex makes a bit more up top rather than down low, my guess would be either the blower is a bit more efficient, or the FMIC is able to keep temps down better at higher loads. This overlay shows about a 20whp difference. Not very noticeable when you're making >400whp

 

Rotrex blowers are slightly more efficient then Paxton units. 1-2psi worth of equivalent power output. But they are delicate compared to Paxton units and produce more heat, with a limited ceiling. Rather moot though when you can boost a paxton another roughly 5-8psi to compensate for that efficiency deficit.

Air to Air Fmic relieves heat quicker once warmed up so in that sense its good for turbos and maybe why they are chosen for Rotrex blowers. Air to water takes longer to heat up and longer to cool down. Fmic has a lot of plumbing to move air through reducing throttle response and ratio of boost loss is higher. With this understanding and experience, its always been my position that on a fixed/limited boost making device aka supercharger, allowing the most efficient way for that boost to get to the engine is the name of the game, and why Air to water heat exchangers of appropriate size, such as the larger racing exchanger thats utilized for the SOS kit, are the best all around performing choice for a supercharger system if you want to get the best NA like throttle response and most power possible out of one. of course there are several facets to get right in order to be able to capitalize on power output. But pound for pound, I think the Paxton blowers coupled with a good water/air exchanger for cooling still provide the most potential and longevity for a competition and street application.

 

Above comparison is fairly worthless as pressures vary so much


I don't have it on paper, but the difference is +/3 hp at the same boost on my car

 

Ignore the TTS run, we were discussing KW vs SOS, in which the boost levels are nearly identical throughout the entire run.

Of course there are going to be variances in each individual set up, I think the main take away here however is the shape of the curve. I'm just trying to put to rest the rumor that Rotrex makes significant midrange vs the Paxton blowers.

 

i decide to go with TTS because all imputs i read says that the rotrex blower make a difference in mid range power noticiable than paxton blowers