My M50B30 Build

**Hofmeister** · 06-14-2018, 12:45 AM

i just finished my m50b30 with s52 cams, runing a conforti 2.5 stock cam tune and it moves, cant wait to install the headers 3.5maf and 21.5lb injectors and RKtune it.

**fo3** · 06-18-2018, 05:44 AM

Originally Posted by BleedsBlue

Definitely (or S50 cams); it's been awhile so my memory is fuzzy, but I know there are other advantages in the S50/2 heads like increased flow as well. Head work is everything!

It's the individual throttle bodies for each piston too. As far as head work, it's grind them open as much as possible without hitting a water jacket. It's not pleasing to the eye though.
In another forum a guy is building a s54 and throwing big dollars around.
His head looks like this:
s54 hack port2.jpg
Totally munted up the ports between the cylinders there and the other ones are ragged and not pretty looking either, that one is just the worst but the one to the left looks the same too.
He said:

So per the other thread, I've confirmed that the head is stock. No shit - it left the factory looking like that. I'm still shocked when I look at the photos that (1) something looking like that left an M Division factory, and (2) that work was done with CNC, not by hand.

**BleedsBlue** · 06-18-2018, 01:19 PM

Originally Posted by fo3

It's the individual throttle bodies for each piston too.

We're actually speaking of the S50B30US and S52, which both have a single throttle body.

**S61Dan** · 06-20-2018, 08:41 PM

Update:
Car runs! Lifters were clattery for a little but cleared up! Running on Miller's 402 "performance tune" for now. I also brought out my style 5s that I refinished. Waiting on tires.....

**NikosX** · 06-20-2018, 11:43 PM

Originally Posted by S61Dan

Update:
Car runs! Lifters were clattery for a little but cleared up! Running on Miller's 402 "performance tune" for now. I also brought out my style 5s that I refinished. Waiting on tires.....

Post a video! Very exciting. Can't wait to hear it run.

Sent from my iPhone using Tapatalk

**S61Dan** · 06-21-2018, 05:18 AM

I will. I had little to no time last weekend to get a start attempt in so videos came second to trying to get it going

**dannyzabolotny** · 06-21-2018, 02:36 PM

I’m curious as to how an M50B30 feels compared to an M50B25... does it have a bit more low end torque or is it all top end power?

**S61Dan** · 06-21-2018, 05:04 PM

Originally Posted by dannyzabolotny

I’m curious as to how an M50B30 feels compared to an M50B25... does it have a bit more low end torque or is it all top end power?

I guess I will find out how peppy it is. Haven't driven it yet.

**Hofmeister** · 06-21-2018, 09:36 PM

Originally Posted by dannyzabolotny

I’m curious as to how an M50B30 feels compared to an M50B25... does it have a bit more low end torque or is it all top end power?

Im not sure how straight forward my answer can be but here it goes, m50b25 stock cams and m50b30 s52 cams feel very similar, except just more torque everywhere on the new motor. Very stock like powerband but now I actually feel like im getting pushed into the seat. It also doest die as much after 5500 as stock cams did. I did upgrade to the m54 intake cam on the b25 and lost a ton of low end with it but did gain a bit on top end.
Im also awaiting a proper tune, currently have a conforti b25 stock engine tune. Debating injectors and after that Ill install the long tube headers and 540 maf i have with tune for those.

**S61Dan** · 06-22-2018, 05:22 AM

Originally Posted by Hofmeister

Im not sure how straight forward my answer can be but here it goes, m50b25 stock cams and m50b30 s52 cams feel very similar, except just more torque everywhere on the new motor. Very stock like powerband but now I actually feel like im getting pushed into the seat. It also doest die as much after 5500 as stock cams did. I did upgrade to the m54 intake cam on the b25 and lost a ton of low end with it but did gain a bit on top end.
Im also awaiting a proper tune, currently have a conforti b25 stock engine tune. Debating injectors and after that Ill install the long tube headers and 540 maf i have with tune for those.

Have you looked into a MILLER set up? I have had my car running on the preloded maps for awhile. Haven't started tuning with it yet though.

**Hofmeister** · 06-22-2018, 12:09 PM

Originally Posted by S61Dan

Have you looked into a MILLER set up? I have had my car running on the preloded maps for awhile. Haven't started tuning with it yet though.

I had but im honestly not too impressed by it. The only feature that made me consider it was having 3 maps in case I ever end up spraying it (literally have 2 kits sitting in the trunk). For the same or less i can just get a tune by RKtunes with unlimited retunes.

**S61Dan** · 06-24-2018, 05:39 PM

Originally Posted by Hofmeister

I had but im honestly not too impressed by it. The only feature that made me consider it was having 3 maps in case I ever end up spraying it (literally have 2 kits sitting in the trunk). For the same or less i can just get a tune by RKtunes with unlimited retunes.

I got mine second hand and didn't pay that much for it, but full price I am sure there are other options