Central 20 Ecu. Need Some Anwsers. Help !

[WogsRus]

ELO

Well ok so the story goes, a guy is looking at buying my series 2 ecu. For the money i get for that i can get a CENTRAL 20 ECU, for my car. Now i have done pleanty of searches, and only found a few pages, all not very conclusive.

So the thing is, we put it into the car, and it ran fine, no detonation, or anything that we could hear, test drove fine. This was with the SAFC II set to zero correction. I have been told that these fuel up at high rmp, so with the SAFC II, we should be able to squize out all we can.

The reason i am thinking of upgrading the ecu, is that the R&R is starting to shit me a bit, and really want to runner higher boost settings. the stock ecu pulled 187 rwKw at 10.2 psi, but i want to try about 13 or so and run 12 all the time.

Now i was going to dyno the CENTRAL 20 ECU first and then do the swap, but the guy wants it now. So i was wondering if anyone has had any experiance with these chips, and weather it is a good swap to do?

Anything, any advice at all, i don't care. Need some help.

Chip seams to be same as this.

http://www.skylinesaustralia.com/forums/in...c=133858&hl

[Beer Baron]

it's impossible to say if it's a good idea or not. it could be mapped for a car running a 3037s at 22psi with 600cc injectors, and a Z32 AFM. or it could be mapped for a car running standard injectors and a standard turbo at 12psi. there is no real way to tell unless you can get someone who knows what they are doing to read the map. or put it on a dyno first but even then you will only be able to tell the basic stuff like: is the AFR ok, and is the engine audibly detonating. it wont tell you anything about temp compensation or ignition maps etc.

personally I wouldn't bother. it's a stop gap.

[WogsRus]

humm yeah i think a quick test is in order. DAM IT.

[psybic]

So its not an ECU, its just a modified ROM. So its just a remap.

So you want to sell your ECU, buy another one that has been remapped ( as beer baron says, without knowing what its been mapped for ), THEN, correct it with an SAFC?

Why are u swapping one stock ECU for another stock ECU ( with a different map ) then correcting it with an SAFC??

Why not just correct your current ECU with the SAFC? As soon as you start tuning with the SAFC, that is the device with the accuracey for the tune. If you want more accuracey and control than an SAFC, you will need a decent ECU that can be tuned. NOT a stock ECU which has been remapped.

[WogsRus]

humm well not really, the ecu is remaped and has R&R removed and speed cut removed, and looks like the chip can be removed and reprogrames. I am mearly getting it to remove the R&R, as i am hitting it now.

Form what i have seen the ecu is for an r33 with light mods. But i will check somehow.

[paulr33]

sell stock ecu, sell safc, powerfc and never look back

[Adriano]

I dont think anyone can remap the ecu over here, as its definately not the same chip as say an r32 chip.

[Az_StrYdeR]

Does Dr Drift do remaps for series 2 ecu's?

If he does, can you send your ecu to him and get him to just take off the R&R and speed cut??

[MANWHORE]

No he doesn't. For r33 ecus, the map is held in the processor itself.

The remap consists of unsoldering the stock processor, and resoldering on a new one which has been mapped.

It's different to the 32 ecu which has the map on a separate chip.

It can be done, and there's a guy in sydney who does them.

It's not cheap though, because the only people who sell the chips are mines in japan.

But in answer to your question, a chip if done properly can work very well. e.g. the guy in sydney essentially just increases the scope of the air that the ecu recognises. e.g. stock, above a certain level, the ecu is like shit, I don't know what's going on, so it goes into r+r

By remapping it, such that that higher level of air is still reconigsed, r + r is gone.

The afr won't be perfect 12, since it's not tuned for your specific mods, but it's still good, because the r + r is gone, speed limit is gone, and you can make fine adjustments via the safc/cas.

I wouldn't just swap the ecu though. You'll have to dyno the car to make sure it's good.

e.g. just in case if it was remapped for 700 cc injectors and a big turbo or somehting (probably won't be, but just to be sure).

[WogsRus]

yeah got it in to get checked so see how it goes.

[Adriano]

Is there any way you can try the computer on the dyno te see if it makes a difference before you buy it? Ive heard they run super rich up top, but dont retard the timing like the stocker, so unfortunately a SAFC2 should in theory work better on a stock computer as you are able to lean it out more under load without having detonation problems. I am currently looking for one of these computers to see if i can remap them, and i highly doubt that mines is the only source of the chips, as im sure they dont make them.Does anyone have any contact details for the guy who remaps the r33 computers?

[WogsRus]

YEah DR Drift is in tas soon, i'll get it on the dyno then.

[Beer Baron]

i just realised your in tas. if you dont have regular access to 98RON fuel then definately dont bother. in my experience they run lots of timing in the mid range which makes the car feel nice and responsive, but it's also a very delicate area of the map, and without good fuel you'll be prone to getting detonation right around the point where it's ramping up to full boost.

[Az_StrYdeR]

In the last few months BP have introduced 98Ron fuel (finally) in Tas.

It's in very good supply now and is the only thing thats been in my car since its been in Aus

[psybic]

humm well not really, the ecu is remaped and has R&R removed and speed cut removed

Yeah the ECU is remapped.... a remapped STOCK ECU. So yes really, it is a stock ECU. With a map you don't know about.

Wanna know how else to remove R&R -> SAFC tells your current ECU its seeing less air than it is. Thats what they are used for. Thats what most people use them for.

You know... they don't actually RE-PROGRAM the remapped ecu's. Thats why they are called remapped. They just change the map. So the algorithms remain the same. Its just when a certain point on the map is reached, it has new values.

The functions that calculate what to send to each output remain in the ECU and are called by the processor, which also remains the same.

Its only the little 2 dimensional array which is altered in a fuel map and same can be done in the ignition map. Other values stored can be altered also, such as speed cut, etc.

Its whole bunch of HEX values stored in one file.

[WogsRus]

I wonder then if these can be changed and stored if you edit them using Nissan Datascan or something simmilar. Well i am goign to chuck it on the dyno andyway and see what happens. if it's crap i won't take it, if it's good, we see what we can achive.