Car's gonna be hiding away for the winter soon! Can't wait to test this out beforehand.

 

I drive my car through Vermont winters. Going places these cars should never go lol

 

SonicRat, can this be made to just have stock specs and maybe ditch the AFM and run speed/density with a little tweaking? Maybe heated MAF sensor at the least? The S5 NA intake manifold is restrictive as it is, then add that stupid plunger AFM in front of it.

 

^^^^^^ I would like to implement this on a stock N/A s4 car by deleting the AFM.

 

If you read back through, you will see where at least on the turbo ecu afm is deletable and then you will be running on the map. I would assume it can be done on an na as well.

 

Yay for boards.

 

I just jizzed a little.

 

OSH Park?

 

Yep, since it was LaenPCB. Although, lately I've had a couple of issues.

 

Aww boner town! Now just need to populate. What's the ETA on sending these out?

 

Most should be out this week, minus those that needed the entire board built as I'm still waiting for parts. Some are already in the mail.

 

this is awesome, I would love to keep the stock ECU and all of its functions for emission equipment but hopefully increase power through a little tuning. Definitely have my interest for when you start messing around with the S5 ECU

 

Which Ecu is the 1993 twin turbo 13brew? Can that tune also?

 

in case this hasn't been asked. will boost be limited to 14.7 on the S4 TII?

 

N350, N370, or N374?

Im guess not N350 since I doubt it has the knock sensor circuit/filter.

 

I don't have a pressure sensor to determine its range. However, I think they max around 15-16psi. You can certainly run more than that... however, your timing won't retard any further as it doesn't know there's more.

 

Stock is most likely going to be a 2bar since the car was never meant to exceed 1 bar (14.7 PSI).
As for being able to program higher than that with a 3 bar map sensor, that would be something SonicRat could answer...

 

Yes, a 3 bar is possible. It would require a bit of code changing and new timing maps. Also, I believe there are a few boost related thresholds -- not sure what all of them are used for, but they would have to be adjusted to compensate.

 

Not to take your time away from finishing up programming
But removing the AFM (68% of my interest in this solution) seems to lead to the next logical step of increasing the pressure sensing capability, and that which comes with it.

Actually, I just can't regulate boost with my current setup and regularly hit ~15-17PSI and that would give me peace of mind that I could at least tune for those spikes.

I guess my question is, how intense is it to add more room for the tables? Also what thresholds are you speaking about? I'm curious

 

Im so excited that I just can't hide it!

 

While I guess you could make larger tables....typically the table size would be the same, just different values for each row. Think something like this:

(2bar vs 3bar)
15 vs 30
10 vs 20
5 vs 10
0 vs 0
-5 vs -5
-10 vs -10
-15 vs -15


As for thresholds, I mean like the injector cutover, certain emission solenoids, cruise maybe, and other stuff that the ECU triggers based upon pressure sensor values. I haven't looked at all of them.

 

Just got a 1987 RX-7 13B N/A car today! I want this! I'm actually a software automation test engineer, QA doesn't really describe all I do. I have the equipment to both solder and desolder equipment, if you need someone to help you beta test this let me know!!!

Thanks
Grant

 

Hmm ok,
So we would by doing that reduce our resolution to tune? Or does the ECU interpolate between values? Because my understanding is that it is just a lookup table.

 

Yes, it reduces resolution. You are handling up to an additional 15psi of tuning with the same number of cells. From what I've seen, the ECU does basic interpolation.

 

Is there anyway we could increase the resolution or is the base ecu just not capable of handling the lookup, purely curious.