Nissan ECU Tuning

Herb-86T · Joined: 15 Oct 2007 Posts: 18

well i just tried changing my void to 36 and my k to 0142 and now its worse.

idle afr is 15.1 and afr at 2500 is at 11.7

i left the tp scales the same as my 0148 k value bin, the amount i needed to multiply them by was only like .01 different.

Bernardd · Joined: 15 Nov 2003 Posts: 111

well then, the link supplied isn't correct.

bring your latency up, the kvalue down.

latency makes the most difference at idle

kvalue makes more of a difference higher in the rpm range.

Herb-86T · Joined: 15 Oct 2007 Posts: 18

the next thing im going to do is try this latency value at the 3 k values ive tried previously. i think the k value i tried (0142) is too rich. then im gonna graph all my data and make an educated guess based on the trends.

darkhalf · Posted: Tue Nov 20, 2007 2:16 am Post subject:

think of K constant as a multplier of the final injector pulsewidth whilst latency is an addition in microseconds

as the injector pulsewidth becomes larger (ie higher rpm/load) the latency changes dont have as much effect (based on % of total pulsewidth .. which is measured upto milliseconds)

Herb-86T · Joined: 15 Oct 2007 Posts: 18

well ive just tested about 12 different combinations, and one thing i noticed was the higher i bump up the void, the closer the idle and the 2700rpm AFR's get. i guess next ill try to get them as close as possible, then adjust the k back down to get it more near 14.7 because the last run was near 10. Thanks for the help so far guys, i really appreciate it.

Herb-86T · Joined: 15 Oct 2007 Posts: 18

i cant understand why its still so rich, even with a k at 130 its in the 10's.i even lowered my fuel pressure to 30psi...

Bernardd · Joined: 15 Nov 2003 Posts: 111

Herb-86T · Joined: 15 Oct 2007 Posts: 18

but does 115 sound correct for ~430cc injectors? what is stock FP? i was initially runnig about 40psi. is it 37?

Herb-86T · Joined: 15 Oct 2007 Posts: 18

yes, one of my later posts i mentioned that if i bump it higher, the idle and 2700rpm AFRs get closer. after going so low, it didnt want to run anymore. as of now, the closest ive been able to get it was around 5D and it changed by .95 while reving, and using 60 it changed by about the same, but afrs are in the low 10's at idle.

Bernardd · Joined: 15 Nov 2003 Posts: 111

Herb-86T · Joined: 15 Oct 2007 Posts: 18

my live-edit doesnt like to work with the romulator without freezing up, so i make all my changes with a hex editor then re-upload using the romulators software. its a pain. anyways, i just tried 0110 for K and 5A void and got 14.0 at idle and 11.2 at 2700rpm

cb_drift · Joined: 04 May 2004 Posts: 472 Location: New Zealand

get a program called emutility from the moates website

you can setup the program to "monitor" a binary file and upload any changes to the emulator when they are saved to the file

open emutility - upload base rom to emulator using emutility
tell emutility to monitor file for changes
run editor of choice
edit binary file
save file
automaticly emutility will see the changes made and send them to the emulator

end result - make change - save file - emulator sees change - rinse and repeat Smile

Herb-86T · Joined: 15 Oct 2007 Posts: 18

can changes be made while the car is running? either way, this sounds convienient. thanks a lot!

cb_drift · Joined: 04 May 2004 Posts: 472 Location: New Zealand

http://tunerpro.markmansur.com/downloadUtils.htm <- emutility...

romulators can make live changes while the car is running - but it has an issue in that a large update (entire fuel map or lots of small changes at once) can cause the car to "misfire" as the emulator doesnt respond in time to the ecu's request...

so potentially - you might get a misfile when you make a large change - and the car will keep running afterwards.... (give it about 10 secs to settle down after the misfire tho - effectivly the ecu is reset and is going thru a "startup" phase again after the misfire)

works perfectly tho ....

also with liveedit not detecting you romulator - it is probably because you have a version that is trying too hard Smile

get the exe file from the forums here somewhere i made (post i made in the last couple of months) and it has a version that "just works" without trying to find anything special or anything...

anyways - have fun with your project

lawrence

darkhalf · Posted: Wed Nov 28, 2007 3:20 am Post subject:

Romulators do not perform 'write behind' changes properly if it is affecting interrupting operation of the code in the ECU

Anytime that the ECU is 'reading' the ROM when the /CE and /OE lines are both low, the romulator should not be performing writes to its internal SRAM. If it does, it will cause the ECU to read bad instructions from the romulator.

I suspect this is also part of the reason why they never got their maptracing working with Nissan ECUs

Moates emulators are a lot better in this respect, as well as being properly self powered via USB port and having double the memory capacity for similar price and being compatible with the romulator protocol