Overrun Fuel Cut Delay settings

FlashPro questions & answers specific to the 2006-2009 (US, UK, Asia) S2000
Post Reply
chneo1982
Posts: 43
Joined: Tue Dec 25, 2012 2:29 am

Overrun Fuel Cut Delay settings

Post by chneo1982 »

Image

There are 2 lean spikes whenever i shift as shown above.

From the log i estimated my gear shift to be around 0.5s.

What is a good overrun fuel cut delay time to eliminate these spikes? My current setting is at 180ms.

Please advise. thanks!

User avatar
Spunkster
Site Admin
Posts: 18801
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata
Contact:

Re: Overrun Fuel Cut Delay settings

Post by Spunkster »

IT is normal to get a lean reading when you shift gears as you are no longer under load.

chneo1982
Posts: 43
Joined: Tue Dec 25, 2012 2:29 am

Re: Overrun Fuel Cut Delay settings

Post by chneo1982 »

Then am I right to say overrun fuel cut only helps squirting fuel when decelerating to cool engine head?

How much delay would cause back firing?

User avatar
Spunkster
Site Admin
Posts: 18801
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata
Contact:

Re: Overrun Fuel Cut Delay settings

Post by Spunkster »

You really do not want fuel spraying durring decel as it is not needed. It is shutting off as you can see in the datalogs.

chneo1982
Posts: 43
Joined: Tue Dec 25, 2012 2:29 am

Re: Overrun Fuel Cut Delay settings

Post by chneo1982 »

I am trying to spray more and longer to cool the engine during deceleration.

Will this be bad for my O2 sensors?

User avatar
Hondata
Site Admin
Posts: 9278
Joined: Thu Aug 15, 2002 12:13 pm
Location: Torrance, CA
Contact:

Re: Overrun Fuel Cut Delay settings

Post by Hondata »

It washes the oil off the cylinder walls and causes ring wear.
Hondata

chneo1982
Posts: 43
Joined: Tue Dec 25, 2012 2:29 am

Re: Overrun Fuel Cut Delay settings

Post by chneo1982 »

But does it really help in cooling the engine? I am using this map only for track.

User avatar
Hondata
Site Admin
Posts: 9278
Joined: Thu Aug 15, 2002 12:13 pm
Location: Torrance, CA
Contact:

Re: Overrun Fuel Cut Delay settings

Post by Hondata »

Engine cooling is mostly moot when you have 70% leakdown.
Hondata

chneo1982
Posts: 43
Joined: Tue Dec 25, 2012 2:29 am

Re: Overrun Fuel Cut Delay settings

Post by chneo1982 »

What about a perfectly healthy engine?

User avatar
Spunkster
Site Admin
Posts: 18801
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata
Contact:

Re: Overrun Fuel Cut Delay settings

Post by Spunkster »

He's telling you that washing the bores down will damaged the engine and negate any benefits.

chneo1982
Posts: 43
Joined: Tue Dec 25, 2012 2:29 am

Re: Overrun Fuel Cut Delay settings

Post by chneo1982 »

I see.... thanks for the advice!

Post Reply