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Old 18-07-2011, 09:13 PM
brownpants brownpants is offline
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Default Rotrex charged R53 BMW Mini

Hi folks

we have a highly tuned R53 Mini which is using the c30-94 Rotrex going straight into a Garrett IC core ( sized for 400BHP ) .

It has stronger internals bla bla bla with coolers for oil , two in line water thermostats , radiator with two pull fans and plenty of ducting to it ( boot mounted )

Now we would like to spray 100% water pre Rotrex and I believe from calculations i'd need a 0.7mm jet trimmed down slightly .

Is there any advice on the use of the 'ring' that allows the injector to mount in the intake to the Rotrex -- as to distance away etc

We havent bought a system but it WILL be the HS3

Thanks for any advice and here's a link to our build thread which is nearing completion
http://www.minitorque.com/forum/f743...tml#post360343
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Old 19-07-2011, 08:51 AM
Richard L Richard L is offline
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Default Re: Rotrex charged R53 BMW Mini

There has been many debates on the wear of the compressor blade but nothing conclusive so the best action to take is to minimise the risk. Putting the jet holder and direct the spray towards the center of the wheel is the natural course to take.
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Old 19-07-2011, 09:51 AM
brownpants brownpants is offline
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Default Re: Rotrex charged R53 BMW Mini

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Originally Posted by Richard L View Post
There has been many debates on the wear of the compressor blade but nothing conclusive so the best action to take is to minimise the risk. Putting the jet holder and direct the spray towards the center of the wheel is the natural course to take.
Thanks Richard

Our main concern is atomisation really or is that not so important pre charger ? Wear on the blades isn't something we will overly worry about at Rotrex speeds hopefully

Do you have a link to the 'jet' holder or is it something that needs fabriacting
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Old 19-07-2011, 04:47 PM
Howerton Engineering Howerton Engineering is offline
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Default Re: Rotrex charged R53 BMW Mini

We would need to know injector size and and expected HP levels to narrow the jet selection. There are a number of factors that also affect how this will work in the application.
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Old 22-07-2011, 12:31 AM
Richard L Richard L is offline
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Default Re: Rotrex charged R53 BMW Mini

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Originally Posted by brownpants View Post
Thanks Richard

Our main concern is atomisation really or is that not so important pre charger ? Wear on the blades isn't something we will overly worry about at Rotrex speeds hopefully

Do you have a link to the 'jet' holder or is it something that needs fabriacting
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Old 02-03-2012, 12:55 PM
brownpants brownpants is offline
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Default Re: Rotrex charged R53 BMW Mini

Hi Geoff and Richard

Well at the moment our car is going to be running at 360 bhp with 550 fuel injectors - that's as of today . We will run like this for a while to set up the car etc until the 'off' season . Then we will put back in the 850 fuel injectors , turn down fuel pressure etc and probably run a 20% Methanol mix with the fuel for CHT reasons . We still have the C30-94 Rotrex so what would recommend water wise ? We are hoping to increase boost higher up our rev range tbh as the Rotrex drops it at 23psi at 7400 rpm at the moment . This is high boost I know for a Rotrex . Our optimum rev limit will be 8K as we have specced the cam , internals for that .

Oh - we tried a 110mm pulley for the Rotrex and boost dropped to 14psi at 8000rpm - this is NOT overspinning the Rotrex at that sizing but at the 95mm WE have now we will be
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Old 05-03-2012, 08:34 AM
St00ge St00ge is offline
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Default Re: Rotrex charged R53 BMW Mini

Atomisation is extremely important pre-SC. It is the water that hasn't been atomised that does the damage to the compressor.
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