boosting S50B32

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  1. boosting S50B32 
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    Opinions on boosting stock compression, 98 octane with switchable maps for race fuel setting.

    I figure 6.5psi for daily agressive driving, 3psi for daily economy and 8-10psi for racefuel on track racing.

    I have heard 10 on pumpgas can be done, but i think that is a bad idea even with good tuning and 98 octane.

    will be running custom built Megasquirt from mtech there in the UK and their software looks alright, has 3 different fuel maps, flat shift, launch control, traction control, fan control, high bandwidth wb02 loosing maf. Already have cat-les free flow exhaust and no muffler. Will change injectors as well.

    Although now i have just read on here about the motec being able to control dual vanos and that sounds really nice!!! may have to get pricing on the m600 and cancel the megasquirt...

    what are experiences and thoughts about a low boost stock compression setup. and yes i know about the 11.3:1 ratio existing already...
    98 European E36 M3 (SMG) Blue, Weichers Strut Tower bars, H&R sway bar kit, custom exhaust, Stoptech ST-40 332mm pagid blue and yellow's on track, SaBelt 6 point belts, KW Club Sport 12kg/mm F&R. Motec M600 with cam control option for Dual Vanos. Turbo build after n/a tune is complete and vanos control is mastered.

    http://www.underpressuregarage.com
     
     

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    so at 6psi compression ration would be (15.91:1) 16:1
    and at 8psi ratio would be (17.44:1) 17.5:1

    98 octane and good tuning can run the 16:1 and race fuel mix can do the 17.5:1 correct???

    boost masters chime in please.
    98 European E36 M3 (SMG) Blue, Weichers Strut Tower bars, H&R sway bar kit, custom exhaust, Stoptech ST-40 332mm pagid blue and yellow's on track, SaBelt 6 point belts, KW Club Sport 12kg/mm F&R. Motec M600 with cam control option for Dual Vanos. Turbo build after n/a tune is complete and vanos control is mastered.

    http://www.underpressuregarage.com
     
     

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    i wouldnt like to boost a stock motor, but thats my opinion. the engine is a highly strung NA motor as it is.
     
     

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    liquidtension on US Bfc has twin turbos on stock S50B32...no tuning even, and on his wideband, AFR's are still safe, and he reports no detonation.I don't know what the fuel is like in Lebanon where he is? he runs 6psi
     
     

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    Quote Originally Posted by zparker View Post
    Opinions on boosting stock compression, 98 octane with switchable maps for race fuel setting.

    I figure 6.5psi for daily agressive driving, 3psi for daily economy and 8-10psi for racefuel on track racing.

    I have heard 10 on pumpgas can be done, but i think that is a bad idea even with good tuning and 98 octane.

    will be running custom built Megasquirt from mtech there in the UK and their software looks alright, has 3 different fuel maps, flat shift, launch control, traction control, fan control, high bandwidth wb02 loosing maf. Already have cat-les free flow exhaust and no muffler. Will change injectors as well.

    Although now i have just read on here about the motec being able to control dual vanos and that sounds really nice!!! may have to get pricing on the m600 and cancel the megasquirt...

    what are experiences and thoughts about a low boost stock compression setup. and yes i know about the 11.3:1 ratio existing already...
    At 6psi it does depend on the turbo that you are using.....but if it is sensibly sized, for example a Garrett GT30 or similiar, then you should be ok.

    However for the minimal extra effort involved, I would strongly recommend fitting a multi layer head gasket to lower the compression and while the head is off, to fit ARP head studs.

    it is not a very big job compared to the work involved in turbocharging the car and I would strongly advise you do it!

    but if you are set on using the stock engine then it IS doable, and 6psi should be ok with tuning....

    I would like to drive liquid tensions car...... it will be running like a dog with no tuning and no where near its potential with twins :
     
     

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    they are only little stock WRX turbos...
     
     

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    yeah i am watching his thread also...I was looking at the biggest gt35 which will be in the efficiency range and in boost around 3500 according to plot points from the formulas. 6-6.5psi is nothing but on stock power should yeild 500bhp...on regular 98 octane, and of course on race day....8psi would be a gt3 killer...

    I am looking into the bridgestone re-55sr's you talked about since it is a medium hard compound. Alot of guys use them here and like them, buy complaign about the life of them...i will bet money they have the soft compound.
    98 European E36 M3 (SMG) Blue, Weichers Strut Tower bars, H&R sway bar kit, custom exhaust, Stoptech ST-40 332mm pagid blue and yellow's on track, SaBelt 6 point belts, KW Club Sport 12kg/mm F&R. Motec M600 with cam control option for Dual Vanos. Turbo build after n/a tune is complete and vanos control is mastered.

    http://www.underpressuregarage.com
     
     

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