Mathias

Hi!

Will it be required to modify the software, after the cylinder head
has been ported?

tabetha

Should not require software alterations(in theory), as fuel and ignition map is based on flow/temp/load.
The place where my head was modded has engine dyno's and he tells me he does not have to alter fuelling, certainly after mine was done.
tabetha

Mathias

Thanks for the info tabetha!

Turbo Zetec

iTrader: (1)

i disagree, the management works off pressure, the head will now flow more air at the same pressure. more air needs more fuel, so its best to get it set up/mapped.

Jay,

iTrader: (4)

very true could be in danger of running lean i would get it checked to be on the safe side

tabetha

I only spoke to the person who does the heads, and is the same person who does MAPPING on the ENGINE DYNO, you may have more experience of him on mapping on engine dyno's ?
It depends on what porting has been done as flow is dictated by the SMALLEST restriction which is the port size, which in my case is unaltered on mine, just the valve head area has been de shrouded, " certainly after mine was done", sorry that's a repeat.
tabetha

Jay,

iTrader: (4)

i know that the more a engine can swallow air it will be leaner without doubt if its not been changed in the map. A usual tuner fix is tun the fuel pressure up lol.i dont know about your tuner tabetha but i do all my own tuning

kjc300

iTrader: (1)

I think I remember a quote from Stu with regards to this where he said "If a modification doesn't increase airflow (which WILL make it run leaner), then ask yourself WHY you are bothering"


or something along the lines of that

Jay,

iTrader: (4)

tiz true

foreigneRS

exactly

love the sig pic by the way

tabetha

You might not have realised but STU is not a god!!!
tabetha

Jay,

iTrader: (4)

no nether is any tuner but facts are facts mate

tabetha

Another FACT that you might want to consider is not everybody wants to do it the way you say, I am going by what I have been told by someone who DOES have an engine dyno (unlike you ?), if you do all your own tuning why are you even listening to others ?
Personal choice is a fact, the w/m ecu is dead in comparison to modern stuff why spend more to upgrade it that it would cost to get a modern decent one with a hell of a lot more features ?
A business exists to make money FACT.
tabetha

Jay,

iTrader: (4)

i listen to others my boy and learn and try certain thing to see what works

iwould say if you talked to 10 different tuners who had engine dynos /rollers/arse dynos 7 of them would talk shit

tabetha

Just between me and you I don't automatically beleive what I am told anyway, and I have my suspicions about the head mods, "not being enough to need mapping or anything", which is what I was told, as I am very cynical.
This is the reason I have booked mine in for mapping, but on the rollers as don't want done on road.
I was led to beleive that it would not make enough difference to worry about, but anyone can be wrong.
I am just going to get it mapped for now until I can afford a decent ecu, as going LPG next year anyway.
tabetha

sailorbob

Any modification that increases airflow (for the same pressure) will lead to leaner mixtures on a Cosworth Weber ecu because the VE of the engine has changed. The ecu is a speed density system where basically the air flow is calculated as;

Engine Flow = engine displacement * volumetric efficiency * engine speed * manifold pressure

There are of course adjustments for ECT and ACT etc but you can get the general idea.

Chip

iTrader: (3)

If the porting has increased airflow, then it will by definition increase the AFR (ie the car will run leaner), so yes it DOES need a remap.

Any change you make that doesnt need a remap, hasnt gained you any airflow or power basically!