Originally Posted by 94AWDcoupe

I have been following the evo 5 thread. You cant really tell anything from video. You cant see the tach, the speedo doesnt work either. And there is no dyno posted. He did say he was making 480tq at 4000rpm like that was impressive. I have seen a local FP black make 570wtq at 4100 rpm on a stock 2.0. The whole purpose of a twin setup is to gain a broader power band than what can be achieved with a single setup. The only setup that worked from very low rpm and made stupid flat torque was the norris setup. twin turbos arent capable of such a feat. unless is setup as sequential. but most are onto the compound turbos. they give big turbos better spool but they fall short in the low rpm below 4000. they also choke up top more because most the exhaust still has to go through smaller turbo which creates high back pressures

Originally Posted by 94AWDcoupe

And this is how suspect norris did it. Use a small super charger that makes boost right off idle. and then shut the charger off with a/c style clutch, and bypass air around it. then at higher rpm have at it with oversize turbo that is unrestricted by the first.

I dont think the evo 5 is bypassing the supercharger. you can here it the whole time. so the torque curve will fall at higher rpms due to inefficiency of surpercharger in the way.

If some one could just share what supercharger setup was used I would consider building one of these. It may actually be from the 1.4 engine. There is a toyota roots charger being sold regularly on e-bay right now. they come with clutch and bypass valve. but the engine was a 2.4. the charger looks to be on the large side for the project. it came on a toyota previa. I cant find a dyno curve of the previa anywhere. but it may have impressive torque at 2000 rpm. then shuts off charger at cruise speeds.

Originally Posted by Fairclough

I'm not saying you are wrong but a supercharger is a positive displacement pump, I would use a larger supercharger to spool up the turbo (Lysholm 3116 or larger) a small supercharger would not have enough air per revolution! I would also go with a twin screw (Lysholm, Whipple, Kenne-Bell, and Optcon) Roots type blowers do just that Blow, all the others compress the air inside the supercharger and have an internal compression ratio, lower outlet temps.

Originally Posted by 94AWDcoupe

I am not saying I am right. But a blower was used on the VW because the blower gets the air moving the fastest. Its actually making boost at idle according to tech on the car. The heat a blower makes is not gonna be a problem. Its only going to be blowing to about 3500-4000rpm. Then it gets bypassed all together. low rpm doesnt require much airflow to feed. thats why a 16g can make 38psi at 3000rpm and at at 7500rpm it will be struggling to hold 20. A good intercooler will have no problem removing the heat.

Originally Posted by 94AWDcoupe

I am not saying I am right. But a blower was used on the VW because the blower gets the air moving the fastest. Its actually making boost at idle according to tech on the car. The heat a blower makes is not gonna be a problem. Its only going to be blowing to about 3500-4000rpm. Then it gets bypassed all together. low rpm doesnt require much airflow to feed. thats why a 16g can make 38psi at 3000rpm and at at 7500rpm it will be struggling to hold 20. A good intercooler will have no problem removing the heat.

Originally Posted by RSMike

toyota SC12 and SC14 superchargers have electric clutches on them from factory