Progressive fuel cut/fuel return and staged injection

arran · Post by **arran** » Tue Apr 01, 2014 5:27 am

Hi,

I am using Over Run fuel cut on a 13B turbo rotary. It is working quite well by improving drivability on decel. There is however a smallish jolt as the fuel returns.

I'd like to enable progressive return to further improve drivability HOWEVER the Tool Tips tell me not to do that with Staged injection which of course is a normal feature of a rotary motor's fueling. Why?

The engine is running just on primary injectors at that point. What's the risk with progressive return here?

Thanks for any advice,
Arran

Post by **jsmcortina** » Tue Apr 01, 2014 10:58 am

The code doesn't support it, so it likely to do strange unexpected things. That's why the tooltips says not to enable it.

James

whittlebeast · Post by **whittlebeast** » Tue Apr 01, 2014 4:37 pm

Arran

Could you post you MSQ and data log? I would love to see how you have it set up.

arran · Post by **arran** » Wed Apr 02, 2014 2:56 am

Thanks James, is there any likelihood that the code will support over run fuel cut and staged injection?

Whittlebeast, I'll post up MSQ/MSL if you put yours up first!

jsmcortina wrote:The code doesn't support it, so it likely to do strange unexpected things. That's why the tooltips says not to enable it.

James

whittlebeast · Post by **whittlebeast** » Wed Apr 02, 2014 4:07 am

My data is posted at

http://www.ncs-stl.com/miata/LatestDataAndTune/

Andy

arran · Post by **arran** » Sat Apr 05, 2014 6:56 am

Current MSQ attached

arran · Post by **arran** » Mon Oct 06, 2014 5:18 am

Hi, just thought I'd ask whether there might be any thought being put into progressive fuel cut and progressive fuel return for staged injection?

Also I mentioned it in another thread, support for electric water pump would be smashing

Any chance of these couple of things being incorporated into 1.3.3?

arran · Post by **arran** » Thu Nov 13, 2014 1:28 am

Hi,
I just applied firmware 1.3.3. Progressive fuel return does not look to be supported yet.

Progressive return is of most interest because of the jolt experienced when coasting down, on decel the sudden return of the fuel makes the car surge quite a bit.

Post by **jsmcortina** » Thu Nov 13, 2014 4:40 am

That's a 1.4.x feature, it will not be incorporated in 1.3.x

James

arran · Post by **arran** » Thu Nov 13, 2014 4:45 am

that's weird, double post

arran · Post by **arran** » Thu Nov 13, 2014 4:49 am

That is good news! Is that something that is in the current 1.4?

Post by **jsmcortina** » Thu Nov 13, 2014 5:07 am

Oh wait, no. The staged injection restriction is unchanged.

James

arran · Post by **arran** » Fri Apr 17, 2015 5:46 am

Bump, still keen on this.
Progressive return when the engine is on decel would help with drivability

arran · Post by **arran** » Fri Jul 10, 2015 6:41 am

Congrats on releasing firmware 1.4.

Did the progressive fuel return with staged injection make it into 1.4?

arran · Post by **arran** » Tue Jul 14, 2015 5:01 am

bueller?

Post by **jsmcortina** » Tue Jul 14, 2015 5:09 am

The staged restriction is still unchanged.

James

arran · Post by **arran** » Tue Jul 14, 2015 5:13 am

arran · Post by **arran** » Fri Nov 13, 2015 3:14 am

Hi again,

Any developments on development of progressive fuel cut and fuel return on staged injection?

Megasquirt Support Forum (MSEXTRA)

Progressive fuel cut/fuel return and staged injection

Progressive fuel cut/fuel return and staged injection

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