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Old 12-02-2008, 12:46 PM   #1
LukeD
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Default Subaru WRC ALS

So I've noticed a few posts come up as of late talking about the ALS system used in the Subaru WRC. There was a picture posted from a prodrive tour with a turbo, headers and exhaust. On the up-pipe/headers side of the turbo, there was an extra flex pipe with a black box attached to it. After reading through many of the discussions here and having discussions around the shop I work at (HMS Motorsport). We came to the conclusion that that pipe actually pulled air in from the hot side of the intercooler and then pulsated it through the black box and then finally through the turbo, thus keeping the turbo spinning. This would prove to be a more effective way at canceling out the lag and not going with the "bang-bang" ALS that a lot of cars use. So, not fully happy with the conclusion we came up with, I decided to shoot an email over to subaruwrcspares.com The email I received back is here...Rodney explains how the whole system works and also touches on how the big "charge pipe" works which comes from the intercooler to the throttle body. I hope this clears some things up..


picture of the turbo side of the ALS system.

email

Hi

The item you refer to is known as a "rocket". This device is fitted to the header just in front of the turbo and works as a sophisticated anti-lag system.
Air and fuel are fed into a combustion chamber and ignited by a spark on over-run, it can be used in three stages (depending on how long you want the engine to last) and is the cause of the load banging noise that can be heard as these cars pass by and the flames coming out of the tail pipe. This system is used in conjunction with the boost pack which stores excess pressure in it's own reservoir to be fed back into the engine inlet side of the inter cooler when the throttle is depressed after shut off.
All this is coupled to the "flat change" gear shift and launch control system which is of course controlled the the ECU.
Just to give you some idea of prices:
WRC Header 2,200
WRC Turbo 10,000
Boost Pack 3,000
ECU 5,000
Engine Wiring Harness 3,000
The "rocket" system was removed from customer cars by Prodrive, and only cars still under contract (S11 onwards) left the factor with this spec.
Hope this was of help

Rodney

few pics circled is the rocket system/charge canister


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Old 12-02-2008, 02:23 PM   #2
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very cool. I was always curious what that canister was there for
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Old 12-02-2008, 02:26 PM   #3
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very interesting.
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Old 12-02-2008, 11:27 PM   #4
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thanks for the info... I always wondered the details on how that actually worked.


at subaruwrcspares.com
holy crap I wish I could get some stuff shipped over here from them.
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Old 12-03-2008, 03:28 AM   #5
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so this is what that black evo in initial d uses lol.
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Old 12-03-2008, 04:29 AM   #6
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wow, thanks for taking the time to post this, ALS have become a recent fascination of mine.
any insight on how the "boost pack" works. throttle switched or vacuum? fed straight from the turbo or through the bypass valve?
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Old 12-03-2008, 10:17 AM   #7
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Well the simple explenation was that this becomes a circa 5th cylinder dedicated to keeping the turgocharger in efficiency boostready and takes quite a bit to keep the system managed. The advantage is that it is more of a mechanical system than other teams so reliability and electronic connectivity will not disable the engine.

I saw one and got one of the engineers to try and explain it to me but i still did not get the whole picture but in a nutshell there you have it.. it was Sir Harrold Morely's Prodrive S12 WRC car from Barbados that he sold last year.
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Old 12-03-2008, 11:14 AM   #8
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Supposedly its some sort of gas turbine in the rocket chamber. There was a good article on this in one of the race engine technology from 2006. 3.5 bar absolute at 1800 rpm. If you sit on the start line next to an S9 or newer wrc, you can hear it
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Old 12-03-2008, 11:56 AM   #9
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Quote:
Originally Posted by dentsport View Post
Supposedly its some sort of gas turbine in the rocket chamber. There was a good article on this in one of the race engine technology from 2006. 3.5 bar absolute at 1800 rpm. If you sit on the start line next to an S9 or newer wrc, you can hear it
just found that issue online and bought it. kinda curious as to what it says.
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Old 12-03-2008, 01:23 PM   #10
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cool info
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Old 12-04-2008, 09:10 AM   #11
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Please scan and post when you get the magazine

I'm still a little confused about the entire system's interaction and plumbing. Maybe there's a diagram/schematic.

<-- Bought his harnesses from you guys
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Old 12-04-2008, 09:49 AM   #12
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Jblaine,
The fresh, compressed air is taken from right after the compressor outlet and sent to the valve shown in that first photo. It enters the manifold collector right before the turbine. The air mixes with unburnt fuel. Something happens in that "rocket" area and creates a high velocity of exhaust (the only thing that could create that level of velocity at such low engine load would be a gas turbine). Prodrive weren't the first to do this (just make it extremely simple). The first I know of is Nick Mann with his Ford BD Turbo powered hillclimb car. He used a small emergency start turbine from a bell helicopter to keep the turbo at 30+ psi.

If you wait until the first S12 that appears in this video, you can hear the engine idle change. They leave the start line at 1800 rpm. The ford/skoda and Grp N cars leave at 5-6000rpm. Pretty cool.

http://www.youtube.com/watch?v=LpBiZYVfTp8

Last edited by dentsport; 12-04-2008 at 09:59 AM.
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Old 12-04-2008, 09:57 AM   #13
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Quote:
Originally Posted by dentsport View Post
If you wait until the first S12 that appears, you can hear the engine idle change. They leave the start line at 1800 rpm. The ford/skoda and Grp N cars leave at 5-6000rpm. Pretty cool.

http://www.youtube.com/watch?v=LpBiZYVfTp8
That's interesting. Thanks for the video.
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Old 12-04-2008, 04:38 PM   #14
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That must be a hell of a ride on launch.
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Old 12-04-2008, 07:12 PM   #15
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Yeah I saw the "boost pack" on subaruwrcspares.com a few months ago. I never knew what it was.
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Old 12-05-2008, 10:10 AM   #16
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Great post and interesting read! Thanks
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Old 12-05-2008, 10:47 AM   #17
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awesome post!!!
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Old 12-05-2008, 08:36 PM   #18
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wow awesome info! video was great to hear the difference in launch.
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Old 01-31-2009, 01:38 PM   #19
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Hi my name is Rodney and I run Subaru WRC Spares Ltd. Here are two pictures that may be of interest, they show the engine from the latest S12B - S14 WRC car. If you have any questions please feel free to email me at subaruwrcspares@yahoo.co.uk or check out my website www.subaruwrcspares.com If I do not know the answer I will do my best to find out from someone who does.
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Old 01-31-2009, 01:54 PM   #20
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Can someone please explain how I add pictures to my post - I am losing the will to live at the moment
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Old 01-31-2009, 02:10 PM   #21
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You can link them from another site by surrounding the link with img tags. Simply press the button above where you type the text that has a mountain/moon on it (insert image) and paste the link of the picture in there.
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Old 01-31-2009, 02:57 PM   #22
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i dont see any pictures
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Old 09-22-2009, 03:57 AM   #23
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bump for more info!
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Old 09-26-2009, 02:00 PM   #24
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BUMP again for more info
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Old 09-27-2009, 01:26 AM   #25
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Quote:
Originally Posted by u2_m4r1n3 View Post
BUMP again for more info
lol i have no more info.
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