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Home > Technical Chat > Pully size

Rammie2000

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1751 Posts
Member #: 10190
Post Whore

belgium

22nd Dec, 2012 at 07:33:10pm

Hi all I have been looking on the web for a boost calculator... And found out that I would need a pulley of 110 to 115 mm in diameters to get a eaton m45 charger down to 11.5 psi...

I have entered that a standard mpi cranck pulley is 178 mm in diameters engine is 1330 cc displacement of charger 770 cc



https://spreadsheets.google.com/spreadsheet...ader=true&gid=0
Is this correct??? Where the hell will I find such a size of pulley?
How much boost is advised to run? I will get the engine down to aprox 8.5 psi. And I will use it for street fun and casuall track days.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Rammie2000

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1751 Posts
Member #: 10190
Post Whore

belgium

22nd Dec, 2012 at 07:35:07pm

Also I calculated that the charger will run a 10075 rpm at 6500 rpm engine speed.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Chalkie

1909 Posts
Member #: 9764
Post Whore

Northamptonshire.

22nd Dec, 2012 at 07:42:59pm

think its 15% reduction pulley you need to go to 11.5


Rammie2000

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1751 Posts
Member #: 10190
Post Whore

belgium

22nd Dec, 2012 at 08:01:32pm

So instead of a huge pulley I need a smaller pulley? If I enter a 15 % smaller pulley( 55 mm) in the calculater it say ill run 40 psi! Owkey I guess that thing is not working...

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


jakejakejake1

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293 Posts
Member #: 10010
Senior Member

Northants

22nd Dec, 2012 at 08:34:07pm

The smaller the pulley on the charger the higher the boost you will run - I think he means a 15% reduction pulley will reduce boost by 15%, but the actual pulley itself will be bigger

Rammie2000

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1751 Posts
Member #: 10190
Post Whore

belgium

22nd Dec, 2012 at 08:51:26pm

so is there a pulley / boost calculator i can trust? so i can calculate the correct pulley diameter for me?

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018

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