some of you lot at donny where having
flames on the overrun, now is this
on purpose i.e for brief cylinder cooling?
if so how much fuel?
what sort of ignition values?
obviously not good for mpg but
i have switchable maps so can
have this in 1 of the maps!

Lee

 

I think some of it could be down to the ECU - e.g. EsCos P8 ECU has fuel cut on overrun as std (although it can be altered) not sure that the older ECU's have this, so could be a combination of a bit of extra fuel by 'design' or due to the ECU.

 

when we first fitted ALS on my car years ago we had problems with it, it only worked at very low revs, we subsequently found out that the P8 had fuel cut off switched on, hence no fuel for ign retard to burn

 

Bring it over with your lap top ...

 

as far as i am aware all the cossie ecu have the fuel cut off programmed into them although mines not working (L6) it knows i have shut off the throttle but it is still firing the injectors so karl mapped it so the injectors where hardly delivaring any fuel!before this mine banged out flames due to the fuel!so long story short u want flames over ride the fuel shut off

 

To add, all OEM ECU's with a Cat' will have overrun fuel cutoff enabled by default - so as not to poison the catalytic converter.

 

I noticed this on Dingys MK2 at donny. He was putting flames out for what seemed like ages at the end off the pit straight going into redgate!

 

No decelleration fuel settings on my omex 600. (Doesn't cut the fuel)

Lots of popping banging and flaming on the over run and off throttle.

 

if its good for the engine then i want it.
i imagine the injection of fuel will cool
things internally pre ignition but then
in turn will this raise exhaust valve temps?
my map is here and you see no fuel @ say
5000rpm 0% throttle.

 

It won't be shown on the main fuel map

 

Will do.

 

Should be an option somewhere, along with Acceleration Fuel Settings, and Decelleration Fuel Settings, or something along those lines.

I'm sure Martin will sort it

 

You think setting fire to something with petrol will cool it down? Have you been drinking?

 

i think he means that the fuel is igniting in the exhaust not the chambers so there for the unburnt fuel is lowering chamber temp by not burning and carry heat out with it

 

So lubricating the bores with neat Petrol then yeah?
Smoke would be the last of your problems after a couple of thousand miles! You would need a new engine!

How are you proposing to turn off your spark to enable this engine wear, i mean cooling?

Its amazing how many different stories you hear to cover up bad mapping, it really is!!

 

Would you recommend putting some decelleration fuel cut off settings in then Stu??

Would it cause bore wash over time?

 

but its bling in it bruv and because dingy's car does it ,it must be cool lol never see the facination in tipping a bucket of fuel into bores to wash them out unless rebuilding engines is fun and free lol

 

i was trying to see where the poster was coming from , i know that it would cause a major problem with bore wash if the over fueling was excessive

 

Wouldnt you want oil if anything to cool things down? oil spray jets under the pistons?

 

So is it something that's mappable then with a custom map if wanted. Say for example on my focus could it be done on a custom map if I asked?

Just curious...

 

im sure you will have a cat on the focus,,, it would KILL it

 

Stu thats why i asked if its good thing for the engine,
i.e how much fuel to put in
how much igniton etc
if there is no advantage i don't want it
as i said earlier

 

would it cool the valves? well im guessing here but as petrol absorbs heat energy 7-10 times faster than air, i would say yes!

would i map it in! No, because of the point stu makes!

crazy thing is, turbo F1 cars did it,,, ALOT but im not sure of the reasons

 

does your type of engine suffer with valves burning out? if not, why do you want to cool them and theres other options to try first before the fuel/bore washing begins

 

its a road car gareth and used, but never a problem,
but on the trackdays you do give it some stick ,
Wot,higher revs than normal, so if that leads to hotter
things can that be a problem potentially and if so
will a little cooling off throttle help?
as we all know on Wot we can cool cylinder temps with
more fuel to reduce det / excessive egt i guess, but these are all
question not statements so if i'm wrong i wanna learn

 

if its needs cools it will be on WOT not when you let off, and it suddently has a couple of massive gulps of fresh air!

making sure you valve guilds have the correct clearance, and valve to valve seats are of the correct fitment is a much better way of ensuring a cooler valve

 

I have a de-cat exhaust

 

is it worth paying the expense just to tip fuel down your exhaust?

 

@ nearly Ł5 a gallon i like to use it what its ment for lol

 

Renault interiors?

 

run leaner then tight git

 

spot on young sir mixed with a match jobs a goodun

 

behave just run it how it should be

 

wasnt they just all running various early forms of ALS?

 

'OR' may be one of the 'naf' tuners of the ford world mapped them.
Charged the customer for a full remap, then just do full throttle, and leave everywhere else mega rich, so it runs smoothly.

 

Like i said just curious to know if its possible to have it on a custom map. And I don;t really want flames and huge bangs, but a little bit of bang pop pop pop bang would be nice

 

Mine was mapped by Steve Greenald and it seems spot on.

 

Water injection for cooling?????????

 

yes for the charge air cooling

 

so thread starter may want to look into this instead