Ignition Issue?

[Aaron BNR32 GTS-T]

ok so i hooked up an 'ECU TALK' to my r32 gtst and i have found that when the car is cold the ignition timing is out...

it goes from the normal 15*btdc at idle to 7* btdc up tp around 2800rpm then starts working as normal from there to red line.

once the car gets warm it stops and i dont experiance it until the car is stone cold again. i just replaced the coilpacks with splitfires

and it still happens so thats no the issue

my question is what could be causeing this? crank angle sensor? i recently did the timing belt and everything was sweet and looked in order

cheers for the help

[rob82]

ok so i hooked up an 'ECU TALK' to my r32 gtst and i have found that when the car is cold the ignition timing is out...

it goes from the normal 15*btdc at idle to 7* btdc up tp around 2800rpm then starts working as normal from there to red line.

once the car gets warm it stops and i dont experiance it until the car is stone cold again. i just replaced the coilpacks with splitfires

and it still happens so thats no the issue

my question is what could be causeing this? crank angle sensor? i recently did the timing belt and everything was sweet and looked in order

cheers for the help

Its commanding that value - therefore its in the tune.

I believe its a catalyst warm up function. I've havn't disassembled these ECU's enough to find where it requests the retard from but I'm guessing its a single signed 8-bit value added to the main table.

[Crans]

RB20 ECU will hard set timing during warm up

[Aaron BNR32 GTS-T]

yeah i didnt know if somthing was out but when it kicks in after a few hunderd meters of driving i lose like all its power and bogs down, i didnt know if it would damage my engine or not...

[rob82]

RB20 ECU will hard set timing during warm up

Are you sure? I'm sure the timing changes it's just heavily retard from the main map from what I remember. Can you elaborate on where this value requested?

[Crans]

Ive got a nistune rb20 ecu running my rb25 i have adjusted this table as my car was too retarded on warmup

While logging i saw the reported timing value matched this table

[GTSBoy]

I concur. I had always thought that the standard tune locked in 15° until it was warm. On my car, pretty much the instant the temp gauge made it to the centre of scale you can feel the timing unlock and it gives a tiny little jump. Doughy before that and normal afterwards. As carns says, you can adjust this with Nistune.

[Rolls]

standard they pull shitloads of timing so just needs a retune with nistune or something. Can make the car drive pretty shit when cold once you start modifying stuff.

[Aaron BNR32 GTS-T]

standard they pull shitloads of timing so just needs a retune with nistune or something. Can make the car drive pretty shit when cold once you start modifying stuff.

yeah i have found that ot goes like a sack of shit when its coldish, i do need to take it to get tuned cause it didnt get a full tune in the first place because of coil pack failure

just got to put my front mount on and she will be ready for the tuners

but this shouldnt damage my engine if i drive it like this until then?

[GTSBoy]

It's actually better for it to run low timing numbers while it warms up. a) it helps warm it up faster, b) it stops you from driving it hard until it has at least a little heat in it. The only reason to adjust it is if it is being a complete pig because of being modified away from where the Nissan methods works. If it's just being a little doughy then best leave it as it is. My car is basically stock (injectors and turbo are stock), so it still behaves more or less as Nissan intended. My temp gauge comes up to mid scale after just a few minutes of driving if I drive straight off from a cold start. That's where the cold start retard ends. That's OK with me. So I didn't bother changing it when I tuned the ECU.

Edited September 27, 2011 by GTSBoy

[Aaron BNR32 GTS-T]

yeah mines a pig lol a truck taking off from the lights is the same acceleration speed lol

i have exhaust, ARC intake, ARC side mount, turbo back exhaust, blah blah blah lol so maby

i should get it all sorted when i get it re tuned