ECU Master EMU Black

[spitfire6]

Hi,

 Modified ignition curve to be similar to Ian's.

Will see if any e in a few days when the tank will need refilling.

Then it's Acetone time.

Cheers,

Iain.

[Nick Jones]

0 to 60 degrees in 500 revs? Really?

And 60deg? wtf? 
 

0 is not enough and 60 is too much. Much too much. Prepare for odd noises…..

[zetecspit]

7 hours ago, Nick Jones said:

0 to 60 degrees in 500 revs? Really?

And 60deg? wtf? 
 

0 is not enough and 60 is too much. Much too much. Prepare for odd noises…..

I had a tuner set all my 0 tps ig adv to zero obove 1500 rpm. His logic is it pulls the egine revs down faster when you lift. Sort of makes sense, and modern cars cut fuel totally (i think?)

60 degrees is madness. And there seem to be a few oddball cells, particuarly in the 6500rpm column. 

But my concern is low throttle resolution, low throttle openings are usually very close together, I think mine start at 2%  gradually increasing and ending up with 10% intervals over 60%TPS (at that point all you want is full power!)

[spitfire6]

19 hours ago, Nick Jones said:

0 to 60 degrees in 500 revs? Really?

And 60deg? wtf? 
 

0 is not enough and 60 is too much. Much too much. Prepare for odd noises…..

Hi Nick,

 What odd noises should I listen out for?

Cheers,

Iain.

[rogerguzzi]

14 hours ago, zetecspit said:

and modern cars cut fuel totally (i think?)

Hello 

          My Microsquirt cuts fuel off on throttle lift

Roger

ps I thought they all did?

[Nick Jones]

23 hours ago, spitfire6 said:

Hi Nick,

 What odd noises should I listen out for?

Cheers,

Iain.

Pinking type rattle, harshness, holding-back. 

[Nick Jones]

21 hours ago, rogerguzzi said:

My Microsquirt cuts fuel off on throttle lift

Roger

ps I thought they all did?

Most of the MS versions running “extra” firmware have the option available but you have enable it. I do now have it but not yet enabled. I will once I’m happy with the general mapping.

[spitfire6]

 

13 minutes ago, Nick Jones said:

Pinking type rattle, harshness, holding-back. 

Hi Nick,

 Do you mean because of the 60 BTDC values?

Cheers,

Iain.

[rogerguzzi]

1 hour ago, Nick Jones said:

Most of the MS versions running “extra” firmware have the option available but you have enable it. I do now have it but not yet enabled. I will once I’m happy with the general mapping.

Hello Nick

                 I must be lucky as I have had it set like that from the start!

I do sometimes notice a slight lag on roopening the throttle! 

I thought I would have a look at Accel enrichmant settings to see if I could get it to add a bit or can you set it so it does not cut off completly?

Or I may just live with it and accept it is part of getting 45+mpg!

Roger

[Nick Jones]

1 hour ago, spitfire6 said:

Do you mean because of the 60 BTDC values?

Yes. That’s a lot. 40, even 45….. not 60.

 

10 minutes ago, rogerguzzi said:

I thought I would have a look at Accel enrichmant settings to see if I could get it to add a bit or can you set it so it does not cut off completly?

You can alter the cut in and out points.  It is a bit prone to leaving a flat spot when you come back in as all the residual fuel gets sucked off the walls. I did have it on the PI and never got it as seamless as I would have liked.

Accel enrichment might help but it’s a tricky thing in its own right!

[spitfire6]

Hi Nick,

 The engine does not "Pinking type rattle, harshness, holding-back".
Why would it on deceleration & no fuel?

Cheers,

Iain.

[Nick Jones]

On PI TBs I’m not necessarily believing decel and no fuel. You only need a crack of throttle on those as you know. Ok at true 0 it might be, but at 2% you could definitely be pulling and interpolating between 60 and 46 you are still pretty near 60.

If it works it works, but I see no reason to put a number that big in.

[spitfire6]

7 minutes ago, Nick Jones said:

On PI TBs I’m not necessarily believing decel and no fuel. You only need a crack of throttle on those as you know. Ok at true 0 it might be, but at 2% you could definitely be pulling and interpolating between 60 and 46 you are still pretty near 60.

If it works it works, but I see no reason to put a number that big in.

Yes, you were wrong.
Small harm done.
Cheers,
Iain.

[spitfire6]

Hi,

Added 0.4% Acetone to fuel (120mL).

Will see on next Tank refill if it works.

Cheers,

Iain.

[Nick Jones]

1 hour ago, spitfire6 said:

Added 0.4% Acetone to fuel (120mL).

What's the thinking behind this?

[spitfire6]

14 minutes ago, Nick Jones said:

What's the thinking behind this?

Hi Nick,

 It's an oxidiser.
if I can use an amount that offsets it's cost when added to petrol than a win. 
0.4% to 10% appears to have many benefits but fuel is cheaper.

I have a gallon I bought to remove stickers. Used to clean injectors & lower CO for emission testing in small bottles.

A lot on old internet about it.

Cheers,

Iain,

[Nick Jones]

Ok. I’ve seen it claimed that it affects surface tension and improves atomisation, bringing benefits to petrol and diesel engines alike. Will be interesting to see if you notice any benefit.  Ethanol also oxygen containing……

Be aware that Acetone attacks pretty much all rubbers except EPDM and a couple of exotics. Everything else in fuel, except ethanol, attacks EPDM.  Maybe not an issue given the low concentration, just keep an eye on your hoses.

Purely coincidentally I happened across this earlier 

Economy is not discussed……

[spitfire6]

Hi,

Checked MPG after timing change & no noticeable improvement.

Checked MPG after Acetone and MPG up at least 10%. 63 miles/12.3L. Speedo reads 10% low so it's more like 20% improvement.

Added 240mL Acetone & will find out tomorrow. Acetone costs £4/L.

Cheers,

Iain.

[spitfire6]

Hi,

145 Miles * 1.1 as speedo reads 10% low is 159 Miles. 159M / 25L = 6.38M/L.  6.38 * 4.54 =  29MPG!!!
240mL Acetone has increased my MPG by ~50%?? Cost a Pound.

Driving was small motorway & lots of tiny & hilly roads.
Pinking Below 1900RPM in 4th on small throttle.

Cheers,

Iain.

[spitfire6]

Hi'

Reduced the timing where I think it was pinging.

Added before & after timing .

Cheers,

Iain.

[Nick Jones]

Looks sensible.

[spitfire6]

On 4/21/2022 at 8:59 PM, spitfire6 said:

Yes, you were wrong.
Small harm done.
Cheers,
Iain.

Belated.
I was wrong for posting what I thought.
Apologies.
Sorry, Nick.

PS. Came up in a search.