I will do whatever you suddgest, your the expert. How would I go about adjusting the fuel/timing/injector size to get it to 1:1 load:map? Should we change when it goes into open loop as well?

Attached are my MAF logs in a zip, Idel, cruise and two wots .

Rom is to big so I can email it to you if you would like.

Mrfred has my Rom. I hope he has some thoughts too.

People like you guys make the performace car industry a blast! I learn so much.

Evan Smith

 

Transients in particular don't like being lean, but you have to sort the base map out before trying to cover up the lean holes with acceleration enrichment.

I dialled mine in nicely with a log of STFT at idle, steady free revving to 1500, 2000, 3000 RPM, cruise at 2000, 2500, 3000 RPM. These boring areas are the ones used in daily driving and important for pulling away, hill starts, etc.

I did wonder about experimenting with a version that had just one VE table of up to 8 items that combined MAP and RPM - with the input being simulated MAF Hz and the output being VE. This would be easier to tune - just run the engine and log the (simulated) MAF Hz and the STFT or WBO2. Do idle, cruise, part throttle, midrange boost, top end boost and you're about done. Works on the Subarus and is easy to tune. You can literally map a preset fuel map with just 8 items in minutes.

 

Evan, I'll look at your logs and reply after.

I think you want it to go open loop at about 4 PSI or thereabouts. If you have a stroker and altered induction system your load is already well off standard, so all this is messed up if you haven't already altered it.

I think it makes most sense to make your engine appear to the ECU not terribly different to stock. Put 14.7 in the closed loop areas and 12 or whatever you want in the full boost areas, so if you're going to run 2 bar (29 PSI) for example, then you want to hit 300 load in the midrange, regardless of it being a massive turbo or stroker. Then you'd set the injector size so that you get your 12:1 AFR or whatever at 300 load.

We can make it hit whatever cells we want, we then just need to put the right numbers in, but I think the above suggestion is most logical/expandable/flexible/easiest to understand.

The only real limitation is that you have to have 14.7 in the closed loop areas.

So you'll end up using injector size to get your midrange WOT fuelling right at 1:1 load:MAP, and use the VE tables to make everything else hit what it should do to get the trims right in closed loop and the WBO2 right in open loop. After that you just put the timing numbers in that you want in the cells it hits.

Make sense? Surely better than trying to emulate a MAF sensor load scaling that only made sense on the stock turbo and 2.0.

 

I'm getting errors with winrar or zip with your logs.

You can email me to jcsbanks at yahoo.co.uk including your ROM if you like.

Please, everyone else, don't send me dozens of emails about how to connect your Tactrix cable. I do this for fun, not masochism. Thanks

 

Yes I think I understand what you are saying.
I am a real visual person lol. Ill email you everything.

Thanks

Evan Smith

 

OK, make the fuel map something like the attached. Then set the VE to 100% in the midrange/WOT and adjust the injector size up or down to make your WBO2 the same as the fuel map. Adjust the VE in the closed loop areas to get the STFT close to zero.

 

so i'm guessing i don't need to worry about MAF scaling anymore

 

I might give this a try too.

 

You will of course have to redo your timing map afterwards, but I think this is the best way. Enforce rationality on it so you can think!

Evan, your load is totally skewed from normal with your mods. Idle vac is not very strong, presumably some fairly interesting cams. Your load pegs 380 even at very modest boost - stroker and interesting induction? Whilst load limits are removed with the patch, I think we'll be best bringing it back down to about 220 for the present boost you're running to give you headroom to presumably run more. I think you'll end up with a much smaller injector size in your ROM than you have presently to then richen it up. I take it you're only injecting water, not meth, and that your fuel pump will be up to the job when you later increase the boost? Would be interesting to know some IPW numbers - typical values for idle, cruise, and the curve for WOT, as basically I want to replicate your present IPW values in these areas but with a totally different load profile...

 

mrfred's download in #205 isn't presently working for me, I could do with the xml additions for 88590015 so I can see Evan's VE tables.

 

Evan, a quick and dirty emulation of your present MAF readings would be:

Set all the RPM VE to 100%
MAP VE:
20,40,60,80,100,120,220,340
16,36,60,99,155,207,380,380

Obviously the load is mapped to clip like the stock MAF does, so you will go lean if you go above your present boost levels.

Might be worth a try, but not a long term solution.

 

Have emiled it to you john, incase you haven't got it yet

 

Do you lock it at a certain value or just ignore it all together?

Alright, I'll see if I can figure out what is the compensated load and how to log it in logworks and take a few more logs tonight and see what happens.

 

It is locked at a standard value of 101.5kPa where the effective multiplier from it is unity (1). If you just kill the errors rather than edit the ADC routine, it is replaced internally with the same value but doesn't show like this in logs.

 

John, whats on your first row in the Logworks log. I have it setup the same except for the top line and it keeps saying "incompatible file"