G'day all

These boost oscillation units are gaining popularity over here. I was wondering if you guys have had much experience with them ?



The one way valve allows improved pick up when off boost, spooling the turbo quicker apparently.
Easier to fit with the reversed manifold but the remote adaptor under the manifold keeps it nice and stealth !

Bruce

 

Somethin looks fishy about that pic????

 

Bruce is this the PMSLOL mod? See on page two I got it working with the MAF

[Edited by john banks - 12/26/2002 8:37:13 PM]

 

Correct John, quite often referred to as PMSLOL - Power Modulating Systems Limiting Overrun Lag.

I have read that a number of these have been fitted to cars in the UK and was looking for some feedback

 

This is a quote from a user on NASIOC

We all know USA horses are a bit weaker than UK/Auz horses, still a fair result though.

Bruce

 

Rob

 

Bruce,

I think you should point out that this system needs to be run with water injection !!!!! This can clearly be seen on your engine, and you really need to let people know ALL the details.

Just for you Wallis

Mark.



[Edited by R19KET - 12/26/2002 11:15:40 AM]

 

mark... you pissed?? cant you type or is your grammar just ****?




david

 

Correct Mark, There is a slight risk of detonation unless the engine is fully remapped to compensate for the increased airflow.
Water injection can indeed overcome this.
The car in the pic is not my RA, it is clearly a 99- from the throttle body/bodyshell design (intercooler hose through inner wing)
May I also mention that this system can only be used with a Link/Motec/GEMS or similar ECU which uses MAP as the load reference, the air flow meter is temporarily bypassed during turbo spool up phase via the additional reed valve controlled intake port.
More info on this system can be viewed at

http://www.boyesen.com/products/snowmobile/index.html
good night

Bruce

[Edited by 96 Rex RA - 12/26/2002 10:04:19 AM]

 

Bruce,

I do find that with the LINK the oscillation can get out of control - so I am using the MF2 to both control the water and an air injector valve to control the oscillator. With this approach I can get the MD309 to produce 1bar of boost in around 14ms at 1700rpm - right up to the redline at 9,000 rpm. Its amazing how the oscillator helps you increase the redline - why didn't you mention it!

Anyway - on the rollers I got 478ft lbs of torque and 415bhp at the top end - mind you the boost was tailing off there to around 0.8bar.

Trout

 

It April 1st or something?

 

Trout does this mean I can run this safely on my car if I have the Aquamist 2s system and Ecutek or is MAP over MAF essential.

 

WTF?

Could somebody explain what this actually does, because at the moment my "Snake Oil" light is flashing, especially seeing the above (and highly suspicious looking) pic.

 

I think this thread should be one of the first for the 'Advanced Technical" forum...It would make a great start for the new year.

Anyone else agree?????

Think I'll go have another drink now

[Edited by ustolemyname??stevieturbo - 12/26/2002 1:19:57 PM]

 

Hey Stevie...have one for me, huh?

=staggers off singing= lol

 

Tried the hyper link,its about snowmobiles and jet skis! Which product am I meant to be looking at?

 

Deep, the url relates to the special high pressure carbon reed valves which form the key part of the BOCU. They are also used on racing 2 stroke engines such as snowmobiles.

Trout I think you are making fun of me ? why ? Do you not understand ?

Here is a better link which will go some way to explaining the theory
http://www.boyesen.com/products/moto.../radvalve.html

Bruce

[Edited by 96 Rex RA - 12/26/2002 3:08:13 PM]

 

I believe it is very real. Isnt this what has made THOMO's car so fast??? It wasnt the 2.7 18valve legacy/wrx conversion, or the ported and flowed Evo spark plugs, or even the STI 25 ecu, it was the BOCU he also didnt mention that was fitted by his mechanic.

 

There will be at least 3 cars at Well Lane 4 using a similar set up to this. Harvey's, Alan.G's and my own
I find it amusing just how little people actually know or understand about these systems.

Andy

 

AndyF,can you please tell me if one of these can be run with a car using Ecutek and WI(2s) or is a MAP based ECU essential.Also where can you purchase them from?
Many thanks,Deep

 

This would actually work btw. It's just a valve that allows the engine to draw air straight in (ie not through the turbo) when driving off boost.

The WI hokum is nonsense, unless you feel you need WI at 2000rpm with no boost....

The picture above looks like a fake, as there appears to be no reed block, unless it magicallly fits in the filter, but then the thing would be rather small.

Probably more at home on a low emissions, low power, high efficiency concept car.

Paul

 

Bruce,

you are right - I don't understand how it works. I got mine set up complete from Andy.F - I think he has most testing in the UK.

However I do think that Pavlo understands less than I do - as a proxy anti-lag system you will find that you do need the WI as the EGTs skyrocket at low rpms destroying turbos as the boost is rising.

Before fitting I was only getting 346bhp and even less torque. I think that anyone who needs help in the UK should speak to Andy - he really understands how this works.

Trout

[Edited by Trout - 12/26/2002 6:48:47 PM]

 

I'm not sure I believe in all these 'bolt-ons' but perhaps it goes some way to explaining why andyf has made 370 hp for under £1000 when others seem to have spent fortunes for much lower output figures ?

 

Bruce, I have managed to get this working with a MAF based ECU today with a few tricks with a microcontroller. Details remain under wraps for now until the next rolling road day. Needless to say there will be some eyebrows raised when I operate the control unit

 

Group buy anyone

 

Just spoke to a friend(who does'nt post here) who had this mod fitted a few weeks ago on his STi7.Reckons that he's getting 1 bar boost at 2000rpm,and 1.3 bar boost by 2600rpm all the way to 6000rpm then tails down to 1 bar by 7000 rpm.In other words no lag at all!! I'm ordering mine on Monday!

 

Bruce (96 Rex RA)

Please do post a direct link to where you got that quote - as according to the search on NASIOC that does not exist.

How am I not surprised?

Christian

[Edited by ChristianR - 12/26/2002 10:32:00 PM]

 

Nope, my calender says it's not April 1st yet.

 

C'mon guys...you at least have to admit how these work?
The website makes no reference to anything other than high airflow on NA, Carbed, small displacement engines. Totally irrelevant to a scooby, then?

What is Boost Oscillation? Does the engine not recieve a smooth constant flow of pressurised air? Does fitting a flap on the injection manifold (which presumably loses all that compressed charge when it pops open) improve things? How?
Is it the resistance of the engine that prevents a turbo from spooling up quickly, in which case there are much better ways of achieveing this result than a flap on the inlet manifold! (think dump-valves with light springs, think ISCV people)

Until I see some real technioal information, this will remain a work of fiction, guys.