RomRaider

Thanks for the maps. In your spare time, can you verify in IDA if I have the following correct for MS41.1? Some of them were comparable, some, not at all.


Fuel Cut - Engine Speed Hysteresis (Maximum) - C_N_HYS_MAX_PUC - 0x2F4h
Fuel Cut - Engine Speed Hysteresis (Minimum) - C_N_HYS_MIN_PUC - 0x2F5h
Fuel Cut - Delay Counter (Hysteresis Selection) - C_CYCNR_HYS_PUC - 0x1F8h ??? Unsure
Fuel Cut - Engine Speed Hysteresis (below Coolant Temperature @ Engine Start) - C_N_HYS_PUC_ST - 0x2F6h ???
Fuel Cut Hysteresis - Delay Counter (below Coolant Temperature @ Engine Start) - C_CYCNR_HYS_PUC_ST - 0x1FAh ???
Fuel Cut - Coolant Temperature Threshold - C_TCO_MIN_PUC_ST - 0x360h ?

Thank you.

Thanks to dmunter got the burble and its awesome. Needs some more work to be perfect but changed last cells on 1EB2 table and 1EAA table from 700 to 3700 and pulled alot alot of timing <100mg load and 3700 rpm on timing base tables

https://www.youtube.com/watch?v=Fq_BPUPMp_c

Awesome, was this on warm engine?
I'll try these settings once dry outside. I still have the catback off since the hangers are worn out.

Sounds great. Should the ign retard slow negative throttle be tweaked or the actual base timing tables?

i dont think more timing tweaks (less timing) will help exactly. Need to pull back some fueling first somehow only slightly. I can hear the 'burbles' blowing my cats out . Needs a tad less fuel and that will help with engine braking.

Done on warm engine. Stock OBD2 midpipe and headers, Borla catback.


as far as which tables should be tweaked, ing slow throttle would seem more logical but the base timing table seems to work somewhat in the same regard. I get burbles between shifts now as well <the set RPM point.

Cool. You shouldn't have to change the main timing table at all. Just retard the SNT table more. And maybe increase the 'Change Limitation' values slightly so it retards quicker. And I've noticed that fuel if is too rich, it'll pop...pop...pop instead of a nice controlled crackle.

Also, removing the cat should make it sound a lot better and consistent?

I'll try to get some videos tomorrow.

What are your thoughts on the SNT table between 413 and 411? The data looks pretty different between the two. Is it possible the conversion formula is different?

Great news today! Thanks to mrf for the inspiration and being the heart and moving force of this project!

My SNT table is currently teh same is 412 iirc.

I plan to test this on my track car tomorrow thats straight piped to a vibrant muffler with no cats. It will be alot louder/more consistant i imagine as the cats muffle this kinda thing extremely in addition to causing reverse pulsing and what not (which i can hear midway under the car)


And like i said, though i cant tell perfectly cause of the cat, it seems a little too rich (and smells ) overall as is.

In addition to the aforementioned changes i made See the pics for the changes that made the 'burble'

Return the main timing table to stock and only retard the SNT - Ignition Retard table. I suggested what values to use on Page 1 of this thread...

But based on your timing map even that will only get you to 0 degrees total. You may want to retard it further down to -10 degrees total. So you may need -40 in the SNT - Ign. Retard table. That table will let you retard as much as -48 degrees.


And yeah, you may have to remove more fuel from the Fuel Enleanment table.

Will test tomorrow afternoon, D_munter suggested the SNT tables 'add' to the base timing table giving me a "effective" of alot less than ~0 deg advance, coupled with my unsure (without logging) that all the 411 tables we mirrored from 412 were done correctly made me augment the base timing table instead of something else to get the ing retard we were looking for. I will try to make a nother video tomorrow of driving.

also -40+ deg of advance with (way too much) fuel will surly blow the cats on this car in a brief amount of time.

He's correct in how the hex works in that those values in hex minus 80h gets added to the final calculation. But I have set the formulas in RR to make it more user-friendly without having to know how the code works with it behind the scenes. I posted the description of how these tables work at the beginning of this thread. Basically, a negative value subtracts timing and a positive value adds timing. Keeping it simple.

Also, keep in mind that there are two Ignition Retard tables in use. One is when the throttle is closed and the other when the throttle is just reduced. So if you find some rev hang during shifting while driving it casually where you're not completely lifting off the throttle, retard the Ign. Retard - Negative Throttle table too.

And it's not -40 degrees of advance. It is subtracting 40 degrees from the main table. So if the main table is at 30 BTDC, then -40 CRK will be -10 BTDC total. Check the units on the maps as well.



BTW, everyone, please read the table descriptions I posted at the beginning of this thread. I spent a lot of time writing them and we can avoid a lot of confusion if everyone interprets them the same. You can also find these same descriptions if you go to "Table Properties" in RR. If something isn't clear, feel free to ask.

yes. you rock! all correct.

Here's my attempt at this using the slow negative retard table and not the base timing table. You can see in my settings that I had to change the fuel cut axis to 80 degrees C because I was having trouble getting to 90. I had no luck. It looks like the timing stayed high during decel.