wrx4+ WRX4+ First Things to do

[gpapp]

Hello All, 

I am new to the LINK Community. 

In simple terms, I just bought my wrx4+ and I will be looking to map it myself as I did before with my old ecu.

I am looking to see if anyone could perhaps share some info in regards with my first off setup, because the old ecu, was brilliant in the fact it was simple to use, few tables etc. I knew what i wanted to do and where that simple table is  to be found, where the PC LINK can get a bit overwhelming, specially as I get sidetracked all the time by see all the nittygritty stuff (good stuff tho) .

So I guess, first question is if there's a topic / video going trough PC Link main features? [I been watching HPA's videos for most of the stuff already, however I'm wondering if there is like a basic one on software only, and how to find what you looking for in there, as I found the software with all these features can get complicated very fast]. Hard to explain myself here I guess, but in a way I'm looking for like the newcomers' guide to Link lol. 

 

Secondly, looking at my spec:

MDX321T turbo coupled with the Newage STI 565cc subaru (830cc@3bar) decapped injectors , I am interested if anyone has some standard data for setting the injector dead times or some basic settings I could start them off from..  On my old ecu I didn't have access to this data, and it was just a scaler, which meant that during the initial part of an acceleration run I was getting a huge spike of rich fuel, and I would like to avoid this for the new setup. 

 

3.I was also running 4bar of fuel rail pressure, relative to manifold, this was giving me very steady idle, however I'm guessing that if I can better control the injectors, I should be able to lower the fuel rail pressure, or shall I keep it as the injector spray pattern should be better at this high pressure anyways ? Obviously this pressure will affect my dead times too, this is why is confusing to me. The fuel system itself can take it, as is fully built up using new piping, parallel fuel fed to injectors  all coupled with AN fittings.  

 

4. ECU Knock = WRX4+ has this built in, however when I browsed the base map, I didn't see it enabled.  Should I enable it with the OEM knock sensor ? If yes again, anyone could share what they use for the knock settings?  Secondly, shall/can I buy a wideband knock sensor and set that up on it instead?  

5. Looking at fuel/ignition tables not sure if because I was browsing the base-map without being connected to ECU but it seems to me that the manifold pressure used is an absolute value? Is that true ? if yes, any reason why not to change it to what i'm used to (as in relative to atmospheric pressure). 

 

 

That's about it I guess, ecu's still not in car (pending delivery).  the link can lambda is also going to go in, however I'm expecting that to come with instructions and presets. 

 

Full spec, just in case you have questions is 

2.1 Stroker

version 4 sti heads,

Lateral MDX321T turbo

gt spec headers and 3"full exhaust. 

and about that, rest is all standard supporting mods, like front mount, 3 port etc. 

On my old map i made it to 409 but, but i didn't push hard or anything, as it was the first time i mapped it, and goal was just to take it to 400, plenty more to come from the setup  with this new ecu now in hand. 

 

Thanks and sorry for the long post. 

[Adamw]

6 minutes ago, gpapp said:

So I guess, first question is if there's a topic / video going trough PC Link main features? [I been watching HPA's videos for most of the stuff already, however I'm wondering if there is like a basic one on software only, and how to find what you looking for in there, as I found the software with all these features can get complicated very fast].

There is this at a cost:  https://www.hpacademy.com/courses/link-g4-plus-software-tutorial/  Otherwise, nothing like jumping in the deep end to learn yourself.  The biggest tip I would offer is print out the keyboard shortcuts page from the help file and memorise the common ones, store, save, switch tabs etc...

 

8 minutes ago, gpapp said:

Secondly, looking at my spec:

MDX321T turbo coupled with the Newage STI 565cc subaru (830cc@3bar) decapped injectors , I am interested if anyone has some standard data for setting the injector dead times or some basic settings I could start them off from..  On my old ecu I didn't have access to this data, and it was just a scaler, which meant that during the initial part of an acceleration run I was getting a huge spike of rich fuel, and I would like to avoid this for the new setup. 

"Decapped injectors" mean you are on your own, even if you found someone who had tested them I doubt any 2 batches would be the same.  It might be time to invest in something that comes with decent data?

 

12 minutes ago, gpapp said:

3. On my old ECU I was running 4bar of fuel rail pressure, relative to manifold, this was giving me very steady idle, however I'm guessing that if I can better control the injectors, I should be able to lower the fuel rail pressure, or shall I keep it as the injector spray pattern should be better at this high pressure anyways ? Obviously this pressure will affect my dead times too, this is why is confusing to me. The fuel system itself can take it, as is fully built up using new piping, parallel fuel fed to injectors  all coupled with AN fittings.  

Usually the higher the better, provided idle pulse width doesnt get too low.  But as you say you also want to choose a pressure that your injector supplier will give you data for. Often that will only be around 3bar.

 

15 minutes ago, gpapp said:

4. ECU Knock = WRX4+ has this built in, however when I browsed the base map, I didn't see it enabled.  Should I enable it with the OEM knock sensor ? If yes again, anyone could share what they use for the knock settings?  Secondly, shall/can I buy a wideband knock sensor and set that up on it instead?  

It is not tuned on in our base maps as they are just a start up map to get you running.  You need to fully tune the engine before you turn on knock control and tune the knock control system.

 

16 minutes ago, gpapp said:

5. Looking at fuel/ignition tables not sure if because I was browsing the base-map without being connected to ECU but it seems to me that the manifold pressure used is an absolute value? Is that true, if yes, any reason why not to change it to what i'm used to (as in relative to atmospheric pressure). 

Im not sure what you are asking here?  The ECU needs to know absolute pressure as you are trying to compensate for air density, thats why they are called "MAP" sensors.  It is fine to put MGP on the table axes if that's what you are asking.

[gpapp]

54 minutes ago, Adamw said:

1 hour ago, gpapp said:

 

"Decapped injectors" mean you are on your own, even if you found someone who had tested them I doubt any 2 batches would be the same.  It might be time to invest in something that comes with decent data?

 That is right-  they were done by a local company in UK, LateralPerformance, and they are done in large batches, cleaned and flow matched so that the set of 4 injectors are usually within a very tight range. It was over 1 year ago now since i bought them, I could not remember the the exact values. 

 

56 minutes ago, Adamw said:

Im not sure what you are asking here?  The ECU needs to know absolute pressure as you are trying to compensate for air density, thats why they are called "MAP" sensors.  It is fine to put MGP on the table axes if that's what you are asking.

From my previous experience, fuel table was built on RPM vs Engine Load, and the ignition was built on RPM vs Engine load. Engine load then was calculated based of from the map sensor and some other parameters that we had access to. I guess I saw that I can do the same thing, have my Y axis as engine load for more familiarity.  Is only that when I saw the MGP there, I was like "wow this takes out a lot of guesswork from the tables", is just that it was bugging me to see it in absolute values  :))

 

1 hour ago, Adamw said:

There is this at a cost:  https://www.hpacademy.com/courses/link-g4-plus-software-tutorial/  Otherwise, nothing like jumping in the deep end to learn yourself.  The biggest tip I would offer is print out the keyboard shortcuts page from the help file and memorise the common ones, store, save, switch tabs etc

This is actually not bad, I was looking to get some months of gold membership as i found a few good lessons of interest. Only thing on that, with the gold membership panel, i`m wondering if there's like a menu to browse on past webinars/categories. (let's not digress too much tho);

[Adamw]

22 hours ago, gpapp said:

That is right-  they were done by a local company in UK, LateralPerformance, and they are done in large batches, cleaned and flow matched so that the set of 4 injectors are usually within a very tight range. It was over 1 year ago now since i bought them, I could not remember the the exact values. 

If they cant supply data for the injectors they are modifying and testing then it is unlikely anyone else can.   You can start with our V4 base map settings and see how it works, if you notice lambda changes with battery voltage with those settings then you can adjust them from there.

 

22 hours ago, gpapp said:

From my previous experience, fuel table was built on RPM vs Engine Load, and the ignition was built on RPM vs Engine load. Engine load then was calculated based of from the map sensor and some other parameters that we had access to. I guess I saw that I can do the same thing, have my Y axis as engine load for more familiarity.  Is only that when I saw the MGP there, I was like "wow this takes out a lot of guesswork from the tables", is just that it was bugging me to see it in absolute values  :))

MGP is not absolute values, the "G" means Gauge pressure.

 

 

[gpapp]

Thanks Adam,

by the looks of it I'm going to purchase the PCLINK software walkthrough you reccomended earlier. As I'm sure I'll find there some interesting stuff to learn. Things that I found myself question now is these basic things that I believe will be eplained in this tutorial. (also looking forward to trigger scope function explained). 

I made this decision after  I watched a few past webbinars, and they were going trough some "interesting" menus that once I saw what they "actually" mean I was like, yes i knew this, but I didn't know that's what is called in software :)))  

Let the learning curve begin!