Firmware live stream happening this weekend: viewtopic.php?f=13&p=43195
For anything you'd like to see added to Speeduino
User avatar
By PSIG
#36015
@69 Spitfire G10 - that's all great, but does not state why you need two tunes. Just that his system apparently did not allow extended table capability that Speeduino (and most modern ECMs) have. I think you feel there is a problem that doesn't actually exist for this system. The question is not if more boost needs more fuel, or less timing; that is obvious. Not to be too blunt, but it is irrelevant why his system could not, as Speeduino can. His older system and Speeduino do not work the same. Again, until you understand or use a system like Speeduino, it may be confusing to how it operates differently to other and older systems and what it is capable of.
69 Spitfire G10 wrote:
Sat Jun 29, 2019 11:24 pm
On the fly really isnt that important but id love to hear the official view of it.
No official view here, because 1) it's only my opinion based on knowing how various types of systems are tuned and function, and 2) there cannot be an official (or any other) position on a possible problem that has not been described.
69 Spitfire G10 wrote:
Sat Jun 29, 2019 11:24 pm
"The differences between tuning files are less aggressive ignition mapping and reduced injection mapping combined with lower boost pressure.
Absolutely correct on the goal, and seamlessly handled by Speeduino tables. As already mentioned, with Speeduino you do this with your throttle, placing the engine operation into specific areas of the tables, providing different fueling, ignition timing, AFR targets, etc.

Your "crazy Latvian guy" tells how he changed fueling and timing, without saying why he needed that capability beyond they typical capabilities of modern systems. Again, if you could outline the reason(s) why this is not possible on Speeduino in standard form, then we could analyze why and how it could be resolved.
69 Spitfire G10 wrote:
Sat Jun 29, 2019 11:24 pm
This is his explanation of why he needed dual tune.
So it sounds like I was about right that he had needed different fuel map targets and timing.
Again, he does not say why, but only how he had to do it with a different older system. Speeduino does not have the limitations of EEPROM chips nor require an EEPROM extender, nor require switching them, nor using an emulator to tune. As shown in the Wiki, a Speeduino table will respond to any tuned conditions with the proper timing and fuel with software-configured tables. Extend or shrink them as you like and is appropriate for the engine setup from idle to nearly unlimited boost - configure it, tune it, and it will do what you tell it to do.

It needs more fuel and less timing at 150kPa? No problem. Even more and less for 200 or 600 kPa? Again, no problem, assuming you have the right parts. :lol: Or, much leaner and far more timing at 50 kPa for economy? Well, you know the answer, all in one tune. Again (again), if you have a special issue or consideration as already mentioned, tell us exactly what that is. Else, this system should work fine for controlling your turbocharged G10 for maximum performance, both in power and in economy, in 'standard' form. Comparing how his system and this system work is a poor use of time and effort. Learn this system and go do it. Or, use his system and do it his way. No problem. Your choice. 8-)

David
By runesm
#36569
All you really need to do is tune it well in the full range of the fuel and ignition map, and then just have a knob for adjustable turbo pressure. It's that easy. No need for two maps.

When you cruise you are in the lower portion of the map, where it can feed it a lot of timing and lean mixture, and then when you get on it, you will rise higher and higher up into the maps, where you then have it both richer and less agressive in timing.

Then you just need to adjust the turbopressure down if you feel it has to much power for the use you are putting it through, i.e. wet roads or something. That, or just slack of the throttle a tiny bit.
User avatar
By 69 Spitfire G10
#36668
Oh alright, I was wondering about that, since I have not boosted or tuned my car (fully) at this point, only got it moving.
I agree that this other person was running a far more archaic ECU by what hes described, I dont think it even had the option for 3 cylinders.

I do know that speeduino doesnt use an EEPROM tune storage, isnt that pretty old efi tech? I thought this guy said he had megasquirt at some point. I have no clue what those limitations you mention are though, with EEPROM

Based on the last bit of what you say, PSIG, I should get this boosted. Then ill try to make enough boost and power that it needs more than one tune. :lol:

But yeah thanks, im not sure why the other guy needs it, but im glad to hear I wont need this feature
By ryan_pajero-io
#39072
The only thing I can think of when I can use dual tune is the difference in fuel.
eg:you first make a tune with high-octane fuel, but sometimes you use low-octane fuel. To prevent knocking, you can use For example, you first make a tune with high-octane fuel but you use low-octane fuel. To prevent knocking you can use another tune. Have a more conservative ignition time
To achieve this I think it is very simple, you can simulate a FLEX sensor
By Sina AV
#42874
i came looking for this feature on my miata because i made a flame and burble tune, but i dont want to be running that tune all the time, so i was thinking if i could pin an auxiliary switch on the arduino so i can switch between tunes or spark table/ VE table, so i dont want to keep pulling out my laptop just to change the tune, i feel like that would be more reasonable than fuel efficiency and power or e85
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