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Garett

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Posts posted by Garett

  3. Posted · Report reply

    ok so i took the day off work yesterday and made my outlet manifold for the sc14, happy as with it. i will need to relocate the battery to the boot to make room for my new alloy piping (Free) thanks to a friend and run my wires for the switch which will look like a ac button tomorrow night, man i love midnight autos haha... total cost to date is $293 $250 for sc $40 for longer belt and $3 dollars for 3 1mm cut off discs :) plus my time 2 days..

    post-2228-1308811736.jpg

  4. Posted · Edited by Garett · Report reply

    pictures

    i got some pics but they are nothing pretty haha i found some channel steel lying around and used that is a lil rusty looking but still really strong. once i know that all is good and running right ill take them off copy and enhance.

  5. Posted · Report reply

    = best

    Size up a pulley from an RB20/25 alternator.

    When i looked into using sc14 i THINK that was gunna give me bout 10psi on m50b25

    Using existing aircon pulley on engine and replacing SC pulley with RB alternator one

    its all mounted up (mock up job) took me half a day i got a 6pk2240 for it only just fit, im getting a bigger belt for it tomorrow, while i was there i put the lighter harmonic balancer of the m52 on, happy days... i started it up with the belt on sh*t that sc14 blows some air haha, cant wait to do the pluming

  9. Posted · Report reply

    ok this is what ive found after 25yrs doing this as such and installing sc that you lose 33% crank hp to drive a sc on average thus you gain 100hp you lost 33 driving the sc, turbos consume around 5-7hp based on parasitic drag.

    eg:i did a 1000hp sc ski boat changed to two turbos it made 1315hp.

    topfuel blowers use around 1000hp to drive a blower and thats a screw blower which have alot less drag than a roots whyll they make over 7000hp do a google.

    pressure before and after shows it efficency and before its using atmospheric of 14.7 like all applications do,pressure after is based on how hard your spinning it or its displacment to feed set cu in motor thus small blows become a restriction or wont pump enough to feed the hp your after thus why they all come with a cfm rating.

    this is very interesting thanks crunchy...

  10. Posted · Report reply

    The supercharger will not take 33% throughout the rev range. Where does 33% come from? i've seen it written before. The pressure difference before and after the sc will determine the work needed to rotate the sc. Internal friction of the sc will add to this

    Has the ecu been chipped to suit the extra .3L's?

    no not at this time, im just in the beginning stages of this upgrade. so this i will look into soon, i have another car which i can drive in the process and is for sale everyone haha heres the link http://www.trademe.co.nz/Browse/Listing.aspx?id=382048236

  11. Posted · Report reply

    dont forget superchargers take 33% of crank power to rotate and the sc14 isnt that big should run max 12psi based on the specs i have here due to bearing failer and intake temps, there ok on little engines up to 2ltr.

    get a screw blower like sprintex or whipple

    Does that mean i have to make over 33% power increase for it to be worth doing???

    Yeah it shouldn't be to bad for 8psi at full rev's i have a small intercooler was going to put before charger seens as i have it already and going to get a long one for the front behind the bumper between the fogs.

  12. Posted · Report reply

    you'll need to factor in the superchargers efficiency into that equation as well.

    But as everyone is starting to say your going to need to sort out a way to tune it.

    I forgot to ask what ecu it is currently running on?

    i cant remember what the part number is of i as its been 25,000k since i built the engine, its the standard 2.5l m50 403 maybe??

  14. Posted · Report reply

    Na man 25det injectors are side feed

    Can use rb20det injectors

    they around 100cc more than m50 same impedance aswell.

    the bodies a bit long but you can still get the fuel rail to fit over them

    Also you need to fiddle with the plug to get it to fit.

    otherwise m52b28 ones are 50cc bigger and a direct replacement.

    Really!! im going to get some and put them in tomorrow then with a 4 bar FPR... ill let ya know how it works out.

    This is another handy link

    http://bmwfans.info/parts/catalog/

  18. Posted · Edited by Garett · Report reply

    I have found some good calculators and sites on my quest:

    For Flow conversion, Fuel Injector Size Calculator, Fuel Pressure Modification Flow Calculator

    http://www.witchhunter.com/injectorcalc1.php4

    For Pulley and RPM Calculator

    http://www.culvermotor.com/Engineering-For...Calculator.html

    Horsepower Calculator

    http://www.superchargersonline.com/hp_calc...or.asp?submit=1

    Guide to used superchargers

    Japanese imports...Subaru, Toyota, Nissan and Mitsubishi blowers

    Dimensions and specs

    http://autospeed.co.nz/cms/title_Superchar...94/article.html

    How it all works Super Chargers and Turbos

    http://www.lextreme.com/turbo.html

    If anyone has any more i haven't covered this would be great help if you can list... Cheers ;)

  19. Posted · Report reply

    Im going to do some calculations <_< can you please check and correct where you think needed thanks ;)

    FIRST CALCULATION (Engine Litres/min @ 0 Psi )

    Multiply engine capacity (in litres) times maximum engine Rpm. E.g. 2.8 litres x 6700 rpm = 18,760 litres/minute. Divide this figure by two as engine only fills every second stroke. (18,760/2 = 9,380 litres/min.

    This is the engines air requirements in litres/minute at 0 Psi boost.

    SECOND CALCULATION (boost ratio)

    Add the boost pressure desired (8 Psi) for the engine to 14.7 Psi (atmospheric pressure).

    (8 psi boost desired +14.7 =22.7 psi)

    Divide this answer by 14.7 and this gives the boost pressure ratio. (22.7/14.7=1.54) This is the boost pressure ratio above atmospheric pressure.

    THIRD CALCULATION (Actual air requirements @ desired boost)

    Multiply the boost ratio by the litres/minute obtained for 0 Psi and you get the actual air requirements in Litres/min for the engine at that boost. In our example this is 9,380 litres/min X 1.54 = 14,445.2 litres/min for 8Psi boost.

    To decide on the correct size of supercharger you need to know :-

    1. The swept volume per revolution of the supercharger. (Eaton M62 1 litre/rev, SC14 from a 1G-GZE 1.42 litres/rev, SC12- 1.2 L/rev)

    2. The maximum continuous safe operating speed for the supercharger. (Eaton M62 14000 rpm continuous, Toyota SC14 12000 rpm??)

    3. The maximum pressure that can be safely produced by the supercharger continuously. (Eaton M62 12 psi, SC14 10-12Psi??? teflon on rotors melts??)

    CALCULATION (Supercharger rotor speed)

    Divide the desired air flow (14,445.2 L/min) by the swept volume of the supercharger (SC14 from the 1A-GZE is 1.42 litres per revolution). This will tell you the maximum speed the supercharger rotors must be run at to produce the volume required.

    14445.2/1.42 litres = 10,172 rpm for the SC14.

    So, to make your wanted 8psi happen, you need to spin the SC14 up to 10,172rpm while the Engine is doing 6,700rpm.

    10,172 is under 12,000 so you should be safe running that boost.

    Its up to you how much boost you wanna run, but remember, the more boost you run, the more heat is created and the harder the charger has to work. SO, the harder you boost it, the shorter the chargers life will be due to heat and wear.

    I stole this off another site and changed it to suit me

  20. Posted · Report reply

    thats about the hp i had on my m52tu 2.8 non vanos before gavin tuned mine and got 195. with the charger and some tuning you could be expecting at least 220 i would say. good luck mate.

    :lollies: ohh ho ho that would be nice, mostly i just want the go go switch haha. that gavin guy, sounds like he knows what hes doin...

  23. Posted · Edited by Garett · Report reply

    Sorry i'm not much help with the pulley. What size are you wanting? Are you mounting it in place of the ac or up by the intake?

    Is it a non vanos head on the block? or what (or where) did you get the valve springs from?

    Sounds like a sweet car. I don't think the sc14 is the best idea though. I'd looked into this awhile ago and they would be so far from efficient. There's a merc m62 on trademe that is bigger and would be more suitable. But even that is still on the small side for a 2.8

    Yeah SC14's are cheap, i have it already and im curious to see if it will give me a few more horsy's.

    Im running a m50 non vanos head, block and 2.5 con-rods, m52 2.8 crank and piston heads. running a m20 flywheel the lightest one of the three they run, with the 318is manual behind it.

    Pulley around 135-140mm for 8PSI i think i can make a e46 power steering pulley work thats 137mm and 6pk :D , and seen as i have already removed the stupid after market ac compressor the guy before me had put on id put it there... so it goes up on the hoist this weekend for fitment, and hoping i can make it fit there.

  24. Posted · Edited by Garett · Report reply

    Brent that pulley looks like it will do the job, where do i go to get one of those??

    I was looking around today and i found a 6pk e46 power steering pulley that would be perfect i would just have to make a 42.5mm alloy spacer and drill the holes out.

    with regards to the FPR at the moment is 3.5 bar, going to 4 bar not a bad idea??

    Because i got one off a Audi and turned the bit that goes in the rail to the size BMW so it'll fit..

  25. Posted · Edited by Garett · Report reply

    post-2228-1308050661.jpg This is the beast haha 2.5 stroker to 2.8L M20 light flywheel m50 intake and double valve spring ported head m52 exhaust manifold...etc post-2228-1308051201.jpg I need help :blink: does anyone know where to get a larger outer crank pulley (6pk pref) for my m50b28 to speed up my SC14 blower before i install it, maybe somebody might know if there is a larger one on a different car that will fit or can be modded to fit, any help would be much appreciated.... :unsure:

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