Thread: Does reseting your ECU via NDS resets timing also?

Since reseting my ECU via nissan datasacn i started to see some detonation in the SAFC2...

I´m running a 10:1 EUDM sr20 and i retarded the timing manually when i tuned it... not signs of DET. the engine runs good and strong on a GTI-R ecu, MAF and injectors...

So does reseting your ECU puts back the timing at 20º(GTIR base)?

That's not how timing works.

You said you retarded timing manually (via the CAS), so resetting the ECU doesn't undo that.
The GTi-R base timing is not 20º BTDC. Not really. That is ONLY the timing it runs when in timing mode (higher than normal to keep idle stable). That's it. Same as any other ECU.

How did you retard the timing? If you do not have a chip in the ECU then there is no way to change the timing in the ECU. If you mechanically retard the timing it would not be effected by resetting the ECU.

Probably faux knock sensor results.

But, no, resetting the ECU when it is factory does not reset your timing.

Whait what?

Doesn´t the SR20DE have 15º base timing and gti-r 20º?

I took a timing light, unpluged the TPS, rev it, blá blá blá as per nissan Workshop manual... the GTIR ecu was stable at 20º at idle in timing mode, then i pulled it back to 14/15º as per timing mark on the pulley... then went for a ride and the SAFC2 didn´t see any DET. it´s correctly configured, i´m sure...

I used to see like 20/30 knock reading in really hot days and really high up the rev range, the ECU is GTIR chipped with 7800rev limit... that with base timing at 14º...

Now i get 3/4 at idle and 80/100, after i did the reset...

Doesn´t retarding the base timing retards by same amount trough out the rev range?

Get a nismotronic ..... BAM! Problem solved.

Your running a gtir turbo ecu on a de non turbo motor? What maf sensor are you running? Timing is based on rpm and load if your not seeing the load the engine would under boost the ecu will stay lower on the load scale and will have more timing in it. Get the correct ECU or get a tunable ECU like noted above.

I think "base timing" is a misnomer. "Base timing" sounds to me (and a lot of others) like what timing the engine runs at idle or something.
This not the case. "Base timing" should really be called something else IMO. But whatever. Yes, when you put a regular SR20 ECU into timing mode, it holds 15º so you can set the CAS to 15º and everything will match.
A GTi-R ECU in timing mode holds 20º (simply because it won't idle as smoothly at 15º) so you can set the CAS to 20º and everything will match. The only reason this ECU has a different timing mode setting, is because the compression ratio and cams on the GTi-R makes idle a bit unstable at 15º so to give you steady readings on that strobe light it ups the timing a bit in timing mode.

Yes, this is how it works.

Nismotronic is cool, but since i´m on the other side of the ocean, it would be a costly option, but i´m negotiating a nistune ECU already imported... if it doesn´t come true maybe i consider nismotronic

I have a gtir MAF, ECU, and 440cc injectors just like GTIR and a SAFC 2 to iron out the minor details... since i´m runing low boost i didn´t see the need to go standalone... the only thing i´m limited is timing, can only retard base timing that will afect the table on all the REVs... like BenFenner confirmed... otherwise the wideband tells me the AFR´s are spot on... and the SAFC kinda measures the knock...

I managed to get a really strong car and reliable out of this setup using a TD05, in fact amazingly it put out 303bhp and 228lb.ft



Thank you BenFenner, you just confirmed it... if it wasn´t this way why would people do the "advance mod" on stock cars!

I know is not the ideal, but for a budget using the GTIR parts to turbocharge, works, if you want to get more serious then yes, you´ll need more flexibility that the standalone gives... i´ve seen plenty of 10.1´s with gtir bolt on setup work, it´s old news, but works...

I think much of us are econimcal conscious, if not we would not be messing with sentras and sunnys, but with 300zx and supras... like any other "scene" as we getting old and more financial stable things start to get more professional and well built, that´s my case, i´m now evolving...

Soo why is my car detonating then? Did the ecu reset had anything to due with it?

The ECU reset will adjust the fuel and ignition trims back to their initial settings. The fuel trims might have something to do with it. The ignition trims I thought were much more temporary. If the ECU sees knocking from the knock sensor it will pull some timing but I didn't think it pulled timing permanently like the fuel trims are permanent. You should wait for advice from someone who knows the stock ECU better.
You said you're getting these knock readings from the SAFC2, not the ECU itself?

Yes... the NDS2 or conzult doesn´t datalog knock... unfortunatly...

Only happens when hot... when i have the time i´ll check with the timing light...

Also when hot the timing in the GTI ecu was at 15º dead on, i have some early datalogs... on cold idle it was more... in the gtir ecu was 20º previous of me pulling back the timing, it detonated quite hard when hot, pulled to 14º or so and stoped to have knock readings on the safc... now it returned but less severe...