[Salo]

Hello! Have someone else been battling with his kind of problem? I´ve been dabbling with these low budget- type engine managements for something like 15 years, but this problem got me here bothering your collective wisdom with my hat in my hands.. I´ve tried with 202305 and all versions with 202207. The map fixed/baro/off is not helping with the situation in the problem area on boost, just smoothing things in the vacuum area. The project is with similar parts that i have done couple other cars. wasted spark, 850cc injectors, 044 copy pump, small turbo and E85.. Have i messed something up with settings or does some more experienced individual have some ideas? I attached a short log and the recent tune, the fuel map is ugly as i have just tried all kinds of things with it, and the spark table will be made on the dyno. Oh, and the injectors are firing on batch, as the wiring harness was made like that before my involvement.

[jonbill]

I don't have a rar tool (and don't want one). please can you provide a zip file?
What is the problem? Is it that VE max of 255 isn't enough? Increase the RF value.

[PSIG]

Here is his RAR repacked to ZIP, though most programs will handle RAR these days. I don't have time now, but will try to have a look later.

Salo.zip

(164.92 KiB) Downloaded 47 times

[jonbill]

Thanks David,
so the problem is indeed that the VE Table needs larger values, but they're already > 100 at 20kpa and > 255 at 250kpa.
The tunefile doesn't include the Required Fuel calculation values, it just shows a RF of 4.2 (I think it was).
When I calculate RF for 850cc injectors with an estimated 2500cc 4 cyl engine and the e85 stoichiometric ratio , I get an RF of 7.3.
So I'd suggest the initial problem is RF is just too small. I'd go with 8 or more for now.
Then I'd also wonder about the injection setup - you've got paired injector layout, with 1 squirt and simultaneous injector staging.
Can you clarify what is meant when you said the injectors were wired for batch? does it mean wired for paired as per speeduino wiki? so 2 injectors wired to each of 2 speeduino channels?
if so, I think 2 squirts alternating will work much better.

[Salo]

Hi, And thanks for the replies! The wiring is done with the original harness, so like many older efi systems, uses batch firing, so are essentially all in one wire at some point. I have got many old megasquirt and some speeduinos working well with batch injection too. I have always assumed the reg fuel is calculated with the engine constants and don't need any trickory. Will try to play with that next. Though with the map calculation settings the vacuum area does start with much smaller ve numbers, it still maxes the map at similar boost levels as with any other setting of the map calculation. Will cheat with the RF next. Easier than putting in an rising rate fpr thanks again

[LPG2CV]

In the first instance, you could just double the RF, and halve the whole VE table. As far as Speedy is concerned, it's just math.

You can tune more precisely at idle by having larger VE and smaller RF. increasing VE from 30, to 31, is half the size step of increasing from 15 to 16.

[Salo]

As always, when you hear he solution, it's so obvious and makes one feel stupid actually never had to play with RF numbers like this, so wasn't my first go to makes me wonder how i have done dozens of projects successfully, some even with some power too.. thanks again, i think i will manage from here

[Ilotalo]

Use second VE table to multily you'r table.

Here is my tables now. RE85 fuel and turbo.

[Nbboy]

Hi guys, first time post here but I I just found this forum and I have been tuning my forged turbo miata recently with a man named adam peetz and we cannot seem to figure out this "popping" or misfire or cut that is occurring around 4400-5000rpms. It's really audible and like sputters and then keeps pulling through until I shift. it doesn't feel good and I have been facing issues with tuning on this ecu for the past 8 months. not once have I been able to do a fully wide open throttle pull and hit redline without hitting some sort of sputter mid-pull. the car is on Ethonal, idx1050s, aem 340lph pump with full -6an feed and return. I've added in a log from last night, i personally don't know what could be going on as I've been learning tuning but idk if its hitting boost cut and leaning out or what.

i appreciate any and all info!

[FiatDuino]

It would be useful if the tune file was posted also.

However, the following screenshots are all I can locate without the tune.