I think that is the point. Traditionally twin charged systems like the VW TSIs use a PD blower for down low, and a larger turbo (hence laggy) for up top (not that the TSI has a large turbo but it is only a 1.4L engine).

But the complaint that has been leveled at S2000 SC kits is that using a centrifugal blower they don't do much till VTEC and leave a torque hole in the mid range. The solution in this case is a small turbo. Not exactly sure how small but a GT25 should be more than enough, would spool very early and need the assistance of the blower up top.

But as you said, with the right choice of turbo the top end is adequately covered, and lag is not an issue.

Is this setup better than my GT3071? I guess it might spool a bit earlier but I bet even the SC runs out of puff earlier.

It's the right question, but the wrong answer. But you have to give the guy kudos for trying, and even succeeding (sort of).

 

Unfortunatly, I bet its worse then the standard GT3071 setup. By having the SC in there for top end, its essentially a bottleneck to the boost coming from the turbo. I doubt it would spool any faster and even if it did, you still have another turbine to get through that is hardly boosting.

As I said, a centrifugal SC + turbo set up doesn't really make sense except for the simple fact of doing something no one else has (kudos for that).

 

too bad no one makes a Roots type charger for the S2k, or this kind of setup would be unstopable. the Low end Grunt of bigger displacment (torque!!!!!!!!!) and the high power that our car is known for, i can't imagine a car that could keep up.

someone with power call the super changing companies and tell them to start building a roots type, better yet call saleen, mopar, etc. people who build chargers for american muscle cars and have them develop one for the s2k!

ontopic note.

its a cool setup but i have to agree with a previous post, the restrictive turbo will hinder up high if its a small turbine. unless u did build some bypass. which would be custom and complicated, do able but idk if its worth the money, hell idk if this might be worth the money, most good turbo systems build boost by 4-5k anyways... so u spent money on both to lower it by...500-1000 rpms? hey different strokes different folkes.

 

^^ BRP makes one but uhhhh, its been in development / beta testing for years now

 

You will exceed the rpm on the supercharger and posibly the belt sustem on the S if you have the turbo to the SC. How is the extra boost going to get through the SC to the motor? You also need to get larger injectors.

Not trying to down your project but I have researched this A LOT and tunning the thing will be hard, especially after you start running some boost through it.


Would love to see pics though

 

It my not be a free flowing as a straight piece of pipe but centrifugals don't really restrict flow. They spin the air centrifugally rather than displace it positively.

There are plenty of cases of people running SCs without belts for periods of time with no adverse effects.

 

Why? These SCs are belt driven. Their speed is a direct result of the RPM and the pulley ratio. Air through the compressor inlet will not drive the SC.

 

You're probably right but I would think the other way around, where the turbo is constantly being spooled by the sc at an increasing rate of boost.

 

does the compressor wheel spin while the air goes through?

 

I'm sure there is a small force on it but I bet it isn't even enough to overcome the drag of the gear train.