So UPS dropped this off today

[Rampage]

Originally Posted by dwx

I don't know exactly why but Robert, the son/driver has a ride in another series this year. I'm sure it's cheaper for them to (likely) partially pay for a ride in a car built by someone else than to build their own. They had many problems keeping the FR-S running last year and I'm not surprised they didn't want to go through the growing pains and cost of continuing to sort everything out.

I wish you good luck and hope you have a better experience with that SC than KSR had with it.

[xwd]

Originally Posted by Rampage

I wish you good luck and hope you have a better experience with that SC than KSR had with it.

Talking to Ken, they never really had much of an issue with the SC other than some belt issues. They still have the original 4 they bought and they are all working fine. They had issues with losing bottom ends due to oiling issues, they had belts break that were driving their dry sump pump, etc. Subaru engines haven't really been known to do well in endurance racing series over the years, and I think they were running into a lot of those issues. They did try pushing the SC to 17-18 PSI and found it to heat soak very fast when racing, 14PSI seemed to be the sweet spot for them on the 98 octane. The SC made good power consistently.

To my benefit, I'm not going to be running the car flat out for 40+ minutes at a time.

[Rampage]

Yeah, I knew the SC was not what was failing but rather the engine bolted underneath it.

Well, you got it for a bargain basement price with the original cost of the TRD SC being as much as an entire new FR-S. Hopefully, it will work out for you. Either way, you have a piece of unobtainium there.

[stugray]

I was looking at the pictures on the first page, and my wife walked up and asked me what I was doing.

I said "Well it happened! You finally caught me looking at porn!"

[BadBRZ]

While this supercharger is super sexy, i'd hope it stays off the car. It is a piece of history worth keeping on a "show only" car or sitting in a museum. The power numbers are shit compared to other f/i you can do and running it so you could achieve that power would just be putting wear and tear on a collectable item.

Just don't do it

[xwd]

Haha it's not really that collectible of an item. The manifold is cool but the guts are an off the shelf supercharger Eaton has sold thousands of. Audi uses the same S/C in the newer versions of the S4. I certainly don't plan on it getting damaged... I bought it use in a Street Modified autox class BRZ. It should make roughly 400WHP/300ft-lbs when running enough boost on E85 and have an extremely flat torque curve with instant throttle response. So no I wouldn't say it's shit compared to other FI, at least in my application.

[BadBRZ]

People keep telling me "superchargers can make just as much power as turbos"

I'm waiting... Where are all the 400+whp supercharged 86's

[xwd]

It's not about the peak power. I had a JDL kit with a GTX2867R sitting in my garage. I know it would make more power and more torque, but its about the overall powerband and response.

Turbo all depends on turbo size. The dyno of this supercharger on 98 octane already eclipses what kits like the SBD, etc. make. The issue with a 400whp capable supercharger is the size of the unit, cooling the charge properly, etc. It's just not as easy as with a turbo.

[BadBRZ]

I understand thAt... People don't... I say i want 400whp, they say superchargers can do it all day

[xwd]

Originally Posted by BadBRZ

I understand thAt... People don't... I say i want 400whp, they say superchargers can do it all day

I'm not sure who would say that since to date no supercharger has consistently made 400WHP and that's fairly well known. Maybe someone who knows nothing about the car? Evasive with a modified HKS one I think made close to that, and some Vortech/KW C38 dynos are close, but not quite. I'm not a big fan of the powerband of the Rotrex/Centifigual SCs so I never even looked at them, they make very little torque until really high RPM.

The TVS this is based on is still a Roots blower so it doesn't make a ton of boost at like 2K RPM like a twin-screw does but it makes a lot more torque down low than the Rotrex/Centrifugal. It's much larger than the current Innovate S/C so obviously makes more power. The dyno above making 268ft-lbs I think is the highest I've ever seen on a SC dyno, and I have another one of it making 280 with a more gradual drop off, on that plot it made 351WHP. On this dyno 351WHP is double the stock WHP, that's nothing to sneeze at. And remember this is on 98 octane where most of the other high numbers I've mentioned are E85, there is a big difference between E85 and 98 octane.

[choi0706]

Originally Posted by dwx

I'm not sure who would say that since to date no supercharger has consistently made 400WHP and that's fairly well known. Maybe someone who knows nothing about the car? Evasive with a modified HKS one I think made close to that, and some Vortech/KW C38 dynos are close, but not quite. I'm not a big fan of the powerband of the Rotrex/Centifigual SCs so I never even looked at them, they make very little torque until really high RPM.

The TVS this is based on is still a Roots blower so it doesn't make a ton of boost at like 2K RPM like a twin-screw does but it makes a lot more torque down low than the Rotrex/Centrifugal. It's much larger than the current Innovate S/C so obviously makes more power. The dyno above making 268ft-lbs I think is the highest I've ever seen on a SC dyno, and I have another one of it making 280 with a more gradual drop off, on that plot it made 351WHP. On this dyno 351WHP is double the stock WHP, that's nothing to sneeze at. And remember this is on 98 octane where most of the other high numbers I've mentioned are E85, there is a big difference between E85 and 98 octane.

thought the TVS were "twin screw"? .. the MPs were "roots"

[Khorne]

Originally Posted by BadBRZ

I understand thAt... People don't... I say i want 400whp, they say superchargers can do it all day

The only one i could think of is the Sprintex 335 blower, and they say not to use that unless you have a built motor.

[Sellout]

Originally Posted by choi0706

thought the TVS were "twin screw"? .. the MPs were "roots"

No. TVS blowers are roots blowers. Newer series, a lot different from old school roots, but they're still roots blowers. The rotors are mirror images of each other, they turn the same speed, in opposing directions, and simply move air from one side to the other.

Twin screw is something else entirely. Male/female screws with a differing number of lobes, turning at different speeds, internal compression rather than simply moving air through with no compression...

Do some googling, they're both fascinating.

[mike the snake]

The Scroll type superchargers are also very interesting. The VW Corrado used this type of blower.
[ame]http://www.youtube.com/watch?v=IiYfMGssd9I[/ame]

Originally Posted by Sellout

No. TVS blowers are roots blowers. Newer series, a lot different from old school roots, but they're still roots blowers. The rotors are mirror images of each other, they turn the same speed, in opposing directions, and simply move air from one side to the other.

Twin screw is something else entirely. Male/female screws with a differing number of lobes, turning at different speeds, internal compression rather than simply moving air through with no compression...

Do some googling, they're both fascinating.