I mean, you can factor in temp compensation which will adjust your values dependant on a variable ie the temprature of coolant or IAT.

This means whatever temperature you tune at won't cause a problem as factoring this in will adjust everything accordingly.

 

Sorry not with it today

Do you mean adjustments in the ECU for differing weather and IAT?

If so...

The greddy can alter duty cycle+ignition timing based on water temperature and also intake temperature - its pretty basic TBH with just temp and adjustment values in a 16x1 map (so it looks like it just +/- % off the whole range).

However my coolant only seems a few degree's hotter in hot weather and intake temp is kept in order by the after-cooler so neither fluctuate that much, unfortunately the placement of the stock IAT is poor and generally heats up due to heat-soak.

I didn't play with it much and I'm a little reluctant to since both values dont increase/decrease that much, however it seemed to work.

This is something you could use the DIP switches for on the greddy, as you can swap between a 'RACE MAP' and 'ECONOMY MAP' or whatever you want to tune for, so it has 4 maps: 2 for ignition timing and 2 for fuelling.

As i say to get it working reasonable well you what need quite a bit of time but also accurately emulate differing weather temps as we all know about colder denser air etc.

 

if your IAT is placed in line with the air filter thats what you need to factor in as hotter or colder air will mean ignition advance or retard as you know. It's dangerous if you don't factor in temp compensation as the ECU will not being making any compensation to act upon the difference in temp, and it sounds like it's there to be utilised.

What your saying at the end, you don't need to do that, that's what the temp compensation is for.

 

I'm well aware of these issues, however i think you've over exaggerated.

I think you mean use the 'knock' sensor, which is set at stock values, something that flashpro or a standalone would be able to manipulate more however for my application its fine, IIRC it retards timing at 45c in WOT - never really gets to this temp.

Do you know where the IAT sensor is located , moving it without a good standalone would be a bad idea.

What do you think the map sensor, o2 and IAT sensor are used for, these adjust the map based on varying conditions (elevation, temp, etc). The IAT will knock off fuel if needed, this is also where fuel trims come into play. I have an after-cooler which helps greatly with intake temps, however it may become less effective at very cold temps (this remains to be seen TBH).

Adjustment based on water temperature is virtually no use other than for only for choke etc and very large injectors.

I think you dont understand the stock ECU has compensation built in and can adjust slightly based on the above.

Dangerous?, AFR's will typically fluctuate +/- 0.1 or even 0.2 (at the very most but unlikely) from one weather condition to another that's hardly dangerous. I think you've spent too much time on the yank forum, they do have massively differing weather conditions to us throughout the year, so temp compensation etc is much more use.

The car was tuned on average day which helps a little, so based on the above the AFR will not very vary much.

Of course as mentioned a good standalone is even better due more fine tuning and more control - some of the settings are mind-boggling, and i dont admit to knowing what they all do. I tuned the greddy based on pressure via the more accurate greddy pressure.

At the end of the day I'm using a good piggyback now which basically satisfies the stock ECU as mentioned previously, but as mentioned in the past has its positives and negatives oh and I'm still learning .

 

There is no smaller pulley arriving Andrew.

THIS IS IT!

I've altered the scaling slightly on map so smoothed some fuelling points out now which is good , however bombing down an unused country road to do logging isn't best practice in 4th gear .

 

Mate, you have some skills!

 

Yeah your right, I'm thinking stand alone even though you said piggyback, doh!

On my old standalone when we mapped it we had to factor temp comp in as sat waiting to go out on track on a hot day it would raise 20 degrees or so.

Apologies.

 

No worries, I confuse myself sometimes Rob .

Its all quite difficult to understand how things work sometimes, but what helps me is essentially its a control system with PID etc - which i work with at work. I'm a control systems engineer, however i dont really enjoy my job , cars are much much more interesting .

 

Yeah I bet it helps, especially when you can think of things logically in terms of all the spreadsheets due to what you do day in day out

 

IMO it isn't 100% perfect i could spend around 2 days on a dyno and get it perfect.