Looking at buying a to4e for my rb25. The problem is I have no idea how much power I will make or what boost they can run? the sizes are, front is .50 , rear is .48 is this big or small? Thanks.

l would be going a to4b .6 front and no less than a .8 rear

Quote: Originally Posted by pigsy qld l would be going a to4b .6 front and no less than a .8 rear Are u sure is that right it is only 2.5 litres Some original photos have not been recovered yet.

you need to establish what power you want. .48 is way too small to make decent power in my opinion. listen to pigsy the turbo you are talking about will probably be a step backwards a mate of mine runs a gt3540 with the big 1.06 rear on a rb25 and he has 25 psi by 4500rpm. and thats a huge turbo for a rb25 remember you have lotsa revs with the 25 and keeping it up there is only a matter of dropping down a gear, Some original photos have not been recovered yet.

Hey what is 0.50 front and 0.48 rear mean? Im not up to speed with turbo's.

those numbers a re the a/r ratio of the housings. its basically a number to measure the size of them. a .5 compressor cover is pretty small. consider a gt3540 has a .7 comp cover a .48 rear housing is absolutely tiny. consider that a stock vl turbo has a .63 rear housing