Works kinda like a sequential turbo. Smaller turbine for high lift-off speed at low rpms and the larger turbine kicks in for top speed after the small turbine max out.

But this one the larger turbo is replaced by a Supercharger!


Sorry if repost
-Q

 

I think you've got it backwards; the supercharger would be for the low-end, and the turbocharger would be for high end. Superchargers are much more effective at low RPMs and run much smaller amounts of boost (9-15 psi) than turbochargers, in general.

That's a clean build, but I bet it isn't a daily driver. Hacking that ECU must have been a pain.

 

I bet it gets pretty warm in there.

 

Well I did a search to make sure I didn't repost, didn't find any results, but just to CMA, sorry if it is a repost.

http://www.savspeed.co.za/video/st_the_beginning.wmv

I know it's a bit off topic; seeing as it's not a Subaru....still it has the same concept as above. There are some also dyno vids that show the needle of the boost pressure gauge going WAY past the 2.0 bar limit.

 

You know, the more I look at that buildup the more it bothers me. Having the supercharger driven by the same serpentine belt as the alternator just looks unworkable -- I don't see how it would generate the 10,000+ rpms you need to drive a supercharger. Also, there is no piping for an intercooler of any kind. It also looks like air compressed by the turbo has to blow through the supercharger in order to reach the intake manifold. And finally, the builder left the A/C in the car -- or at least the piping from it! This must be a shot of a work in process, rather than a driveable car.

 

this isnt a repost but a lil while back, i forgot which company posted a cople threads about this setup. i think it was like compund something. they said its around 500 hp and can be daily driven. im not sure if this setup above is the same company im talking about bt theyre setup looks pretty similar. and it the other setup boosts at 1,900 rpms its like driving a muscle car, constant power.

 

neat toy.

 

Hey DICE, I remember those posts from that company, I think it is called Forced Performance, but not too sure. Anyway, I saved the pic from their setup.

 

further inspection shows that they are the same engine bay, just slightly different setups.

 

Why would they "delete" the FMIC? The pic 9Vapors posted makes some sort of sense, but the first post is an odd setup to say the least.

I still hate the idea of the supercharger and alternator being part of the same acessory belt. They need to switch to a Roots blower to avoid that, IMO.

 

I remember someone else mentioned that in the thread that the picture was from, and the company rep got all defensive. He claimed that it had no drain on the alternator.

 

Using one form of foced induction to augment another isn't a new concept; though it has never really been seen in widespread use outside of sequential turbos. With regard to your concern about the serpentine setup, the ratio of pulley size between the alternator and the blower is irrelavant. The ratio would be determined by the size of the crank pulley and whatever component you were talking about (alternator, blower, ps pump, etc.) serpentine driven blowers are not unusual and becoming more common in both the automotive and Marine industries. In regards to you your concern about the RPMs to build max boost, there is a gearbox in the front of the blower that will help overdrive the rotors or screws in this case to achieve optimum boost.

Don't worry about the air flowing from the turbo, through the blower and on to the throttle body. It is no different than that blower working on a regular supercharged setup when the motor is not pulling boost. Enough air can get through the blower to allow the engine to run. What I'd be more interested in is what looks like an electro activated setup on the blower. If you look between the pulley and the housing of the blower, you'll see a little black deal with some wires running to it. The setup looks very similar to one you'd see on the front of an air conditioning compressor. Basically turn the blower on or off by engaging/disengaging the unit.

The biggest negative I could see is that the compressor wheel on the turbo would be WAAAY outside of it's effective range by the time you were pulling bigger RPM where the blower would be puffin hard. You'd be spinning the crap out of the turbo just to keep up with the motor's natural demands, let alone the augmented demands with the blower. A lot of heat comming from the turbo because of this, which would greatly reduce the efficency of the supercharger that is going to add even more heat to the mix. It is actually because of the amount of heat and the realtively low air density the supercharger would be seeing, that they opted to go with a screw compressor as opposed to a "roots" style blower as someone questioned. Of all the superchargers going, the "roots" deals are the least efficient and thus would really struggle to produce boost with air that is already heated/less dense. All in all, it falls into the "looks neat, but probably should have spent more time in the planning stages than in fabrication" category.

Chris

 

Interesting stuff. Yeah, I know the RPM issue with the supercharger can be solved by gearing, but as any kid who has built motorized cars or hobby kits knows, when you gear to increase RPM you lose torque, and there is also some power loss to heat and friction. Don't get me wrong, this is a REALLY COOL setup, and some remarkable fabrication has been done -- this looks as clean and polished as anything to come out of the reality car shows on TV (Rides, etc.). It just looks to me like they had to compromise the peak output of both devices to get them working at the same time and not fight with each other. I'm certain that bad boy is a BLAST to drive, but probably requires a few hours of tinkering and hacking the ECU software to get it running well on any given day. That's got to be stretching the software of even a standalone to the absolute limit.

I agree the roots blower would not be a perfect solution either. Typically those only make sense hooked to a gigantic diesel engine or something running race fuel, from what I have seen -- just icing on the cake, not the core of the power.

I wonder what the cockpit looks like -- a nice big row of toggle switches, or a big red button that turns the supercharger on?

 

Hey all, I found the website of the company that is doing that setup, and posted here on I-club some time ago. Head over and check them out!

http://www.forcedairtech.com/gallery_kits.html

 

Hmm, that car's here in town... Maybe I'll give it a test drive and report back!

Oh man, that Twin-turboed Legacy engine makes me drool. I've got a Legacy GT wagon that's itching to be turned into a stealth monster!