Supercharger Systems -4GEN Liberty/Legacy

[SegR]

Intestink.

Why the clutched charger on the intercooled kit by the way? (what's the benefit of the clutch in this application?)

[Tradewind]

Intestink.

Why the clutched charger on the intercooled kit by the way? (what's the benefit of the clutch in this application?)

The clutch offers benefits anywhere it is used however the largest clutch pulley that I know of is 59.5mm and that happens to fit well into our kit range where we are looking to increase pressure. Typically you only use the pressure increasing pulleys in conjunction with an intercooler as the charge air temps increase with pressure increase.

The next clutch pulley we can access of any useful size is 56mm but this is too small for the Liberty kits.

[SegR]

I'm obviously missing a fundamental point with regard to clutches on superchargers - I thought the idea of a clutched supercharger was to be able to effectively disengage it. What am I missing?

[Tradewind]

I'm obviously missing a fundamental point with regard to clutches on superchargers - I thought the idea of a clutched supercharger was to be able to effectively disengage it. What am I missing?

The pulley we optionally use is also known as - sprag clutch/one way clutch/decoupler pulley or of course, clutch pulley. Commonly used on the alternator of many new models of cars to prevent belt screech on engine shutdown/gear shift or start up.

Another significant brand name supercharger also uses the same system - so far I know only this brand and Raptor offer the clutch pulleys for their SC's

Below is a quote from a forum poster in the USA

The ATI super pulley utilizes a sprag clutch to allow the blower to freewheel when it is spinning faster than the engine.

This will place less stress on the belt, especially when "pedaling". It'll also allow higher boost when shifting gears because the blower keeps spinning.

It's about time we see some "pulley" tech for superchargers.

[Tradewind]

OPTIONAL RAPTOR VL Upgrade item coming available



A couple of pictures to whet the appetite a little

Hoping they perform well for us

There are a bunch new features here, high blade and slim nose/hub maximize the air flow volume, reduced superback - less weight, Tapered/extended Tip is well known to wider map and increase pressure ratio. thinner blades and a very updated aerodynamic blade shape.

Billet is approximately 1.7 times harder than cast







These are now confirmed to be with Raptor by Friday next week


Raptor will from this moment on lead the supercharger world with some extremely advanced impellers, other even more extreme advances are still coming to the front soon such as the M series with the frictionless transmission

The first testing of the new impellers will be in a kit we have produced for a long time that we know a LOT about. Will be back to back into a Raptor V fitted to a ECOTEC 3.8 V6 as found in Holden Commodore's. The test vehicle currently makes 13.5psi boost.

[SegR]

The pulley we optionally use is also known as - sprag clutch/one way clutch/decoupler pulley or of course, clutch pulley. Commonly used on the alternator of many new models of cars to prevent belt screech on engine shutdown/gear shift or start up.

Another significant brand name supercharger also uses the same system - so far I know only this brand and Raptor offer the clutch pulleys for their SC's

Below is a quote from a forum poster in the USA

The ATI super pulley utilizes a sprag clutch to allow the blower to freewheel when it is spinning faster than the engine.

This will place less stress on the belt, especially when "pedaling". It'll also allow higher boost when shifting gears because the blower keeps spinning.

It's about time we see some "pulley" tech for superchargers.

Ah, I see - thanks for the explanation. Nifty. Had never heard of a sprag clutch.

[KiDo_Tuning]

Have dyno results of a supercharged 5psi 05 Outback H6 5EAT coming to this space shortly... Was tuned on Monday, many killerwasps made and more importantly, enoough torque to make the car really boogey

[shav]

Sounds good Matt. Im interested to see the results

[Tradewind]

Have dyno results of a supercharged 5psi 05 Outback H6 5EAT coming to this space shortly... Was tuned on Monday, many killerwasps made and more importantly, enoough torque to make the car really boogey

Matt, post it all up if you like - I havent heard any details at all yet

[3rspecb]

Great to hear another H6 going down the Raptor S/C path.

One question though, why is the boost only @ 5psi ? Was the boost reading via a gauge or read via the H6 OE map sensor?

I only ask as when the kits were first fitted to the h6 Libs (stephen & I), romraider would only log 5psi max boost as the H6 OE map only reads up to 0.3 bar (5psi). After we fitted a boost gauge then we were able to see the true psi the s/c kit was making.

I hear you, torque is king

[KiDo_Tuning]

Waiting to get a copy of the dyno sheet emailed over Tim.

Great to hear another H6 going down the Raptor S/C path.

One question though, why is the boost only @ 5psi ? Was the boost reading via a gauge or read via the H6 OE map sensor?

I only ask as when the kits were first fitted to the h6 Libs (stephen & I), romraider would only log 5psi max boost as the H6 OE map only reads up to 0.3 bar (5psi). After we fitted a boost gauge then we were able to see the true psi the s/c kit was making.

I hear you, torque is king

5psi on dyno boost gauge and also on the owners boost gauge.

[LUVIT]

Ok, so I thought it's about time I join up since my car has been mentioned. Been wanting to start a build thread and looking back I should've...oh well I'll condense it here...
Bought the car 14 months ago and a few months later started reading through the Romraider site to hopefully learn enough to tune the engine myself. There was a lot more to learn than I had anticipated or had enough time for, as I came to realise after the small amount of adjustments I had tried that experience in this field would be well worth paying for. I met up with Matt when he came to Brisbane in November and after a couple of hours driving up and down the Gateway motorway had it going nicely in stock form, especially from low revs. I was already negotiating with Tim on a kit at this time and had the car booked for a custom full twin exhaust fit using Tim's extractors. That was all completed in January and Matt and I have been exchanging email tunes and logs since. Until yesterday the best 0-100 time I've had is 7.5s and we couldn't work out what the problem has been.
Met up with Matt again yesterday at Northside 4x4 at Caboolture to use their 4 wheel dyno. First time I've been anywhere near a dyno and it was interesting. After about 5 or 6 pulls Matt had it go from 138 to 173.2 kw, and Matt said the torque graph is good as it starts to rise early - I'm not sure though about the torque units being from 3300 to 5700, something to do with it being an auto?

Dyno 8-4-2013.jpg (152.08 KiB) Viewed 5216 times

Matt said there's still a bit to tweak. Best 0-100 now is 6.5s though I was expecting it to be lower cos it is pulling hard, real hard. So if 5-6 secs is what the other guys are getting, I'm excited!

5psi on dyno boost gauge and also on the owners boost gauge.

I normally see a max of 8.3 psi on the gauge and in the gauge log, which is about spec for the 59.5mm pulley I'm running

[Tradewind]

Well done indeed, thanks for joining up - you will get some help and your black wagon is a VERY nice car - sounds awesome out the pipes!

For those wanting more detail - this is an unintercooled kit, the supercharger runs a clutch pulley which has the 59.5mm the owner mentioned.

The pressure quoted at 8.3psi on the gauge log is near the ballpark for that pulley - maybe it could be a little more. Can look at that later

Power is good - for sure. This is one car that will gain a LOT with intercooling as the smaller pulley's heat the air at high rpm more meaning less top end power but punch a bit harder earlier in the rpm range

Try you 0-100's first thing in the morning - around sun up in a few weeks time - you might find you can cut it half a second easy enough - all due to temperature


Special thanks to KiDo for the customer support - without the tuners in this world (all of them who tune H6 SC's) we couldn't supercharge at all

[shav]

well done to all indeed. Sounds like a great combo. Can only imagine the power once an intercooler gets bolted on.

[Tradewind]

I will have to get a chart for car I have been working on locally too if possible (Mackay MY07 Liberty)

Is roughly around 231kw at wheel at the moment - no more left it in at this stage - needs a bit more pressure

Would be tidy to put it on 250kw at the tyre, the owner is considering this idea, but a lot of little things need to be upgraded to get there ..........

A pic of how it once looked





The car - owned since new by owner