S50B32 Alpha-N Map

Tue May 15, 2012 6:45 pm

Hello gentlemen

who/what are my options for running alpha-n on an s50b32? Who can flash/live map these? The engine in question is in a Z3M and I live in the Blackpool area

Thanks!

Sun May 20, 2012 2:19 am

We can flash these and reprogramme them for alpha-N type set-up, pm me for more info

Wed May 23, 2012 12:11 am

Anybody have any in-depth info about these alpha-n flashes? What exactly do they do to allow you to run MAFless? Thinking about giving this a try, but dont really want to pay £125+ if it's just a rev limit remover and you unplug your MAF!

http://www.ebay.co.uk/itm/150802827926? ... 1423.l2649

heres an interesting thead ive found:

http://joeysm3.net/?p=449

Wed May 23, 2012 8:43 am

The map the ecu goes to when it detects the maf unplugged is a 'safe' one, set to over fuel and only be driven gently to the nearest dealer..

Wed May 23, 2012 11:37 am

So an alpha-n reflash is nothing more than a remap of this 'safe' map? I want to bin off the MAF sensor and filter box, purely for sound. But I dont want to go to the expense of going for full standalone.

Wed May 23, 2012 12:16 pm

May I ask where you got that info from Jhonno? Im finding it quite difficult to find documentation on the MSS50 ECU. Looking at the dyno AFR graph in the above link, it looks like it runs very lean, not rich?

Wed May 23, 2012 3:08 pm

CHR1S1990 wrote:May I ask where you got that info from Jhonno? Im finding it quite difficult to find documentation on the MSS50 ECU. Looking at the dyno AFR graph in the above link, it looks like it runs very lean, not rich?

You are going the wrong way.. Lower the number the richer it is.

Wed May 23, 2012 3:10 pm

CHR1S1990 wrote:So an alpha-n reflash is nothing more than a remap of this 'safe' map? I want to bin off the MAF sensor and filter box, purely for sound. But I dont want to go to the expense of going for full standalone.

Yes, it is effectively that, plus I would say a removal of the resultant fault code triggering.

The MAF doesn't stop the sound, just fit a Simota or similar intake.

You need a full carbon inlet plenum to get 'the sound' preferably with big cams to go with.

Wed May 23, 2012 10:41 pm

Jhonno wrote:
CHR1S1990 wrote:May I ask where you got that info from Jhonno? Im finding it quite difficult to find documentation on the MSS50 ECU. Looking at the dyno AFR graph in the above link, it looks like it runs very lean, not rich?
You are going the wrong way.. Lower the number the richer it is.

I know, in the above graph the dark red stock DME with MAF connected at 3k the AFR is about 15, light red stock DME with MAF removed at 3K the AFR is way above 18 i.e lean. Past 4.5K granted it is slightly more rich, but only marginally until 6k.

Wed May 23, 2012 10:49 pm

Jhonno wrote:
CHR1S1990 wrote:So an alpha-n reflash is nothing more than a remap of this 'safe' map? I want to bin off the MAF sensor and filter box, purely for sound. But I dont want to go to the expense of going for full standalone.
Yes, it is effectively that, plus I would say a removal of the resultant fault code triggering.

The MAF doesn't stop the sound, just fit a Simota or similar intake.

You need a full carbon inlet plenum to get 'the sound' preferably with big cams to go with.

I beg to differ if Im honest. I removed the airbox and fitted a cone filter i had lying around and went for a blast. Defo gives a nice induction roar, but the heat soak was obviously crap too. I then removed the MAF sensor and rubber elbow. Ive fabricated a K&N panel filter to fit straight on to the end of the plenum (where the albow would clamp on). I then took this for a quick blast up the road - the sound is immense and far louder that any carbon airbox I've heard on an s50 -as for the simota, it's more like a whisper compared. I feel a video here is in need!

So this is where my problem lies - obviously I cant drive around with just the MAF unplugged in this state.

p.s. this weekends project is to fabricate a large cold air feed down to the headlight which fastens straight over the above fabricated panel filter.

Wed May 23, 2012 11:15 pm

Jhonno wrote:
CHR1S1990 wrote:So an alpha-n reflash is nothing more than a remap of this 'safe' map? I want to bin off the MAF sensor and filter box, purely for sound. But I dont want to go to the expense of going for full standalone.
Yes, it is effectively that, plus I would say a removal of the resultant fault code triggering.

The MAF doesn't stop the sound, just fit a Simota or similar intake.

You need a full carbon inlet plenum to get 'the sound' preferably with big cams to go with.

Can this safe map be live mapped?

Thu May 24, 2012 7:10 am

For sound alone, use a cone filter on the end of the maf and build a heat shield from stainless steel. Run the steel from the top of the chassis leg toward the bonnet and then over to the inner wing. Close off the back side around the maf. The large area inside the shield, coupled with the stainless creates a lot of resonance and makes the S50 induction sound nuts, especially when the Vanos kicks in

Took me a couple hours with some stainless sheet offcuts, cost nothing

Thu May 24, 2012 8:54 am

CHR1S1990 wrote:
Jhonno wrote:
CHR1S1990 wrote:May I ask where you got that info from Jhonno? Im finding it quite difficult to find documentation on the MSS50 ECU. Looking at the dyno AFR graph in the above link, it looks like it runs very lean, not rich?
You are going the wrong way.. Lower the number the richer it is.

I know, in the above graph the dark red stock DME with MAF connected at 3k the AFR is about 15, light red stock DME with MAF removed at 3K the AFR is way above 18 i.e lean. Past 4.5K granted it is slightly more rich, but only marginally until 6k.

That top line looks like Stock with the MAF to me..

Thu May 24, 2012 8:57 am

CHR1S1990 wrote:
Jhonno wrote:
CHR1S1990 wrote:So an alpha-n reflash is nothing more than a remap of this 'safe' map? I want to bin off the MAF sensor and filter box, purely for sound. But I dont want to go to the expense of going for full standalone.
Yes, it is effectively that, plus I would say a removal of the resultant fault code triggering.

The MAF doesn't stop the sound, just fit a Simota or similar intake.

You need a full carbon inlet plenum to get 'the sound' preferably with big cams to go with.
I beg to differ if Im honest. I removed the airbox and fitted a cone filter i had lying around and went for a blast. Defo gives a nice induction roar, but the heat soak was obviously crap too. I then removed the MAF sensor and rubber elbow. Ive fabricated a K&N panel filter to fit straight on to the end of the plenum (where the albow would clamp on). I then took this for a quick blast up the road - the sound is immense and far louder that any carbon airbox I've heard on an s50 -as for the simota, it's more like a whisper compared. I feel a video here is in need!

So this is where my problem lies - obviously I cant drive around with just the MAF unplugged in this state.

p.s. this weekends project is to fabricate a large cold air feed down to the headlight which fastens straight over the above fabricated panel filter.

So you made the opening bigger and directly opposite the tb's.. There is where your sound came from. Like running open tb's.

I used to run an open K&N on my S50 in an e30, rarely was heat soak noticed tbh. Esp on the move. The filter was just tucked right away behind the headlights.

Thu May 24, 2012 9:57 am

This is what I make of the graph:

Thu May 24, 2012 9:59 am

"So you made the opening bigger and directly opposite the tb's.. There is where your sound came from. Like running open tb's.

I used to run an open K&N on my S50 in an e30, rarely was heat soak noticed tbh. Esp on the move. The filter was just tucked right away behind the headlights."

Exactly, and this is what I was aiming for. Im not really keen on the idea of open trumpets and filter socks because of the heat soak so keeping the plenum is ideal.

Thu May 24, 2012 10:02 am

jmc330i wrote:For sound alone, use a cone filter on the end of the maf and build a heat shield from stainless steel. Run the steel from the top of the chassis leg toward the bonnet and then over to the inner wing. Close off the back side around the maf. The large area inside the shield, coupled with the stainless creates a lot of resonance and makes the S50 induction sound nuts, especially when the Vanos kicks in

Took me a couple hours with some stainless sheet offcuts, cost nothing

I can see where the stainless resonance would come into play, but trust me, the sound of the open ended plenum is immense - far louder than anything ive ever heard. Great thing is, it sounds totally stock on anything except WOT.