ECU Monitor Enthusiast

iTrader: (1)

CAN OF WORMS OPENED A BIT MORE.......

Every mapper/tuner has their own ideas about how to cool cylinders
when the throttle is shut off.
There is NO absolute ideal method to do this if needed at all.

Anyway, I am not an expert tuner/mapper BUT ponder this you lot....

What cools the cylinders when you are flat out on boost ?
An engine built and setup correctly for longevity should NOT
suffer from over heating of the cylinders in the first place.
Surely stopping the fuel burning or reducing the load in effect allows the
cylinders to naturally cool down anyway.

Some tuners in the early days (and a few even now),
told there customers that they overfuelled during throttle closed
conditions to cool cylinders.
BOLLOX.
The actual reality was the older ecu's heavily filtered the map signal
internally and also the ECU was slow to respond.
The result of this is that you closed the throttle and a few seconds later
the fuel output catches up with actually what is required and
consequently lots of expensive unburnt fuel goes out the exhaust
taking lots of precious oil of the cylinder walls !!

There is no doubt that some engines run right on the limit and
cannot sustain high loads for long periods without meltdowns.
Such engines are time bombs waiting to go off and as such
will require some type of cooling strategy or at best need
setting up properly !

I personally prefer to keep the fuel enabled (based on correct load)
and not drown the cylinders.
I have only enabled the fuel shut off feature to get over the map
sensor problem I initially had.
I have now added extra software in the ecu to guesstimate the actual load
during throttle closed positions and this now works fine and keeps
the fuel on all the time.
This prevents any jerky movements of the engine during rapid changing
of the throttle during transient fuel changes.

Another side effect of fuel shut off - Flamer kits stop working !

ECU Monitor Enthusiast

iTrader: (1)

kennert,
Cutting the ignition only allows unburnt fuel to collect in the engine and exhaust.
When you reapply the throttle, you may get a back fire as the fuel ignites from the
exhaust gases leaving the cylinder or in severe cases missfires as the plugs foul up.

Stavros

Aye, i had overrun fuel shutoff enabled on my 3dr with P8, flamer kit would NEVER work

Luckily anti-lag gave me all the flames i could ever ask for, lol

Ima-Racing500

So does anti-lag cool down the cylinders off throttle or make it hotter?

Versus_Creations

iTrader: (1)

Good question ?

Matt

...and rainbum goes out of business

just stole my old flamer kit back off a mates car before he sold it PMSL