S50B30 internals into a M50B25 and turbo

Post Mon Dec 16, 2013 6:21 pm

Hi all could someone give me some advice i just bought an e30 320ise 3 door in pretty much mint condition. Now me and a friend want to do a project with it. He has many parts laying about, originally we was going to go with the m50b25 and put the 2.8 internals in and turbo it, but now he has suggested to research and see if we can use the 3.0 m3 internals. Now i know the bores are 84mm 2.5 and 86mm 3.0. Now can the 2.5 block be bored out for the bigger pistons. Will the crank and everything else fit this will also be turbo charged.

Any info would be very much appreciated

Many thanks

Post Mon Dec 16, 2013 6:26 pm

use m54b30 crank rods and pistons they fit in the m50 block

Post Mon Dec 16, 2013 6:27 pm

making a 3l m50b30

Post Mon Dec 16, 2013 6:28 pm

wullie325i wrote:use m54b30 crank rods and pistons they fit in the m50 block

Will that then make it a 3.0 are those internals strong? What sort of power can they handle?

Thanks

Post Mon Dec 16, 2013 6:34 pm

a standard m54b30 is around 230bhp but in an m50 engine they seem to make more due to bigger inlet manny on m50b25 engine. i would say with a blower strapped to it 400-500bhp could be achived.

Post Mon Dec 16, 2013 6:37 pm

wullie325i wrote:making a 3l m50b30

M50B30T

Post Mon Dec 16, 2013 6:39 pm

wullie325i wrote:a standard m54b30 is around 230bhp but in an m50 engine they seem to make more due to bigger inlet manny on m50b25 engine. i would say with a blower strapped to it 400-500bhp could be achived.

Ok thats great. Would you say this is a better route than using the S50 internals and if so why just so i understand?

Post Mon Dec 16, 2013 6:41 pm

Id stick with it being 2.5 you will still achieve 500hp stock.
Plus iirc the 2.5 rods are stronger.

Post Mon Dec 16, 2013 6:47 pm

no way lol go for the extra cc's i say

Post Mon Dec 16, 2013 6:54 pm

You will make more power than 400-500hp with a 3 litre. An m50b25 will do that on standard internals with just a head gasket and ARP head bolts

Post Mon Dec 16, 2013 6:56 pm

Well we have the m3 internals we also have a 2.8 cylinder head which i believe will flow better. We can get it rebored cheaply as a friend owns a machine shop. I just need to know if it will all fit after its been bored out or will it require any other modifications?

Post Mon Dec 16, 2013 7:37 pm

Ok i think its gonna be m54b30 internals 2.5 block and 2.5 non vanos head. Any thoughts on this?

Post Mon Dec 16, 2013 7:47 pm

yeah awesome lol 3l stroker ftw

Post Mon Dec 16, 2013 7:51 pm

Am i better off with or without the vanos?

Post Mon Dec 16, 2013 7:59 pm

without as its easier to map without it as a less advanced management unit can be used

Post Mon Dec 16, 2013 8:00 pm

m50b25 non vanos bottom end and head

Post Mon Dec 16, 2013 8:06 pm

Cool thanks for your help. Its gonna be a journey but when shes done it will be awsome. Im sure im gonna need much more help along the way so please bear with me and thanks again.

Post Mon Dec 16, 2013 10:20 pm

Waste of time rebuilding to turbo IMO, your just doubling the amount of money it will cost, and as lee said it will still do 500hp as a 2.5

Post Mon Dec 16, 2013 10:37 pm

And wont chuck a leg out the bed.

Post Mon Dec 16, 2013 10:40 pm

Even if it does, its just a couple of hundred quid M50, not a £2k built engine

Post Thu Dec 26, 2013 4:26 pm

Ok peeps thanks for all your input. Going to go for m50b25 non vanos turbo and just do the head gasket and head bolts will also do arp rod bolts. I would like near to 500bhp as possible. Whats the best turbo to use? Ive been looking for manifolds but all are either cheap crap or mega money so i think its going to have to be custom made. Is it possible to use the standard management system if its mapped by someone that knows what there doing. What injectors should be used? Cheap intercooler kit will be fine ill just have to plumb it in.

Any other suggestions for this build please feel free to comment ive never done this before but i have a genius re-mapper and a fantastic fabricator, i am a mechanic myself so building it is not a problem for me.

Thanks

Post Fri Dec 27, 2013 3:48 pm

You will need standalone. VEMS is meant to be very good, especially for the money. PM Gunni off here, just don't use him for a manifold.

Post Fri Dec 27, 2013 3:57 pm

Ok thanks. Manifold is not a problem my friend is making me one. Is there anyone who can make me a wiring loom to suit the m50 engine in the e30 shell.
Thanks

Post Fri Dec 27, 2013 4:03 pm

Also can you explain why the original management system can't be used as my friend just keeps asking why. Im crap on this side of things.

Thanks

Post Fri Dec 27, 2013 6:50 pm

Converted M50 loom, by me -

Plug and play, fits the engine bay the same as an original E30 engine loom would, pm me if its of use

Post Fri Dec 27, 2013 7:02 pm

Paulcl09 wrote:Also can you explain why the original management system can't be used as my friend just keeps asking why. Im crap on this side of things.

Thanks

Because it uses a MAF sensor as opposed to a MAP and it's not tuneable enough. You can use to standard ecu up to around 300-350hp iirc still using the MAF, then it runs out of steam.

Post Fri Dec 27, 2013 7:30 pm

Looks awsome I will be in touch just sorting out where to get everything and what parts I should use thanks.

Post Fri Dec 27, 2013 7:35 pm

Because it uses a MAF sensor as opposed to a MAP and it's not tuneable enough. You can use to standard ecu up to around 300-350hp iirc still using the MAF, then it runs out of steam.[/quote]

Ahh I see thanks for that info.

Post Fri Dec 27, 2013 8:24 pm

There's a little bit of info in here about running M50 turbo on stock management

http://www.e30zone.net/modules.php?name ... 71&start=0