Budget Ecu's

[DVS JEZ]

Because mine won't hold the timing. The stock ECU keeps freaking out, pulling timing on random occasions. I have a very random misfire at ~5000rpm which is when the ECU decides to pull timing. .

Are u serious? This happened to me on a

25 with rb20 ecu last week. Everytime in the dyno at 5k if pulls around 10 degree's if timing which causes a missfire on the dyno.

[Hanaldo]

Yeh, mine is completely random though, doesn't do it every time. I thought it had 'fixed' itself when it didn't happen for a few months, then out of nowhere it does it again. Same story on the dyno when it was tuned, it made it very difficult for my tuner to work with.

[The Dan]

That last bit I dont fully understand

20deg of ingition timing on one ECU is the same as 20deg on any other ECU right?

so I dont see how one can make more power than another

Because not all of them have the same timing control. When you have course mapping it kinda averages out, with fine mapping you can adjust for all changes and get a much more accurate power curve.

But then you've got the inherent problems with the Nissan CAS that most people don't see. Once you fix those and have a more accurate timing curve, the engine naturally makes more power reliably and stays away from that area of detonation

[zebra]

Yeah fair enough then

luckily Toyotas dont have a silly 360 optical CAS lol

so its a case of being able to run closer to the edge safely when an ECU has more resolution and better control

[DVS JEZ]

Yep. Timing jumps can make a safe tune very bad and inconsistent m

[ARTZ]

What's wrong with Nissan CAS?

[zebra]

they way it was explained to me, is that the sensor has a hard time picking up which of the slots it is reading, so it confuses itself

[battery]

I wouldnt own another Rb25 because of the history of Issues I had with mine

Whaaaa?

Thats like saying your gonna turn gay cause all your previous girlfriends were bitches..

[ARTZ]

[zebra]

I lol'd

however entirely different things imo

[DVS JEZ]

Lmao

[Piggaz]

What's wrong with Nissan CAS?

This is whats wrong with the Nissan CAS. A log from my own car.

[RRob]

I found it wasn't so much the CAS that was causing the issues but the timing belt deflection.

If you ever see a RB on the dyno with no timing cover you will know what I mean.

[Missileman]

This is whats wrong with the Nissan CAS. A log from my own car.

So is there a solution to this, like after market cas?

[Piggaz]

So is there a solution to this, like after market cas?

Yep.

Search 'new RB parts with results'.

It's a write up of what the solution is and performed on my own car. It's not the ONLY option but it's off the shelf.

[Piggaz]

If you ever see a RB on the dyno with no timing cover you will know what I mean.

It's a very scary sight. Better not to look at it and pretend it isn't there!

[STATUS]

Because mine won't hold the timing. The stock ECU keeps freaking out, pulling timing on random occasions. I have a very random misfire at ~5000rpm which is when the ECU decides to pull timing. The ViPEC wouldn't do it.

Now I've got this whole corrupt ECU thing... I dunno. Too many problems. I haven't managed a single tune yet, in the 2 years my car has been turbocharged, that I haven't had an ECU related problem.

sounds weird the r34 ecus are the most stable platforms, have you got some logs to send to pete and matt? in 5years of nistune ive never encountered that issue. Im not saying there isnt an issue in this case but i reckon its traceable. have all the knock flags and feedback been switched off? has the rpm vs ign curve been checked against a stock definition? feel free to send the ecu over and i will check it over as i have a crazy nistuned r34 in the shop atm (350rwkw auto)

i have found on E85 thought the nistune for some R34's does not have enough adjustable parameters above about 350rwkw with 1000cc injectors and big plenum etc.. accel pump gets a bit steppy and cold start etc becomes troublesome... not factory smooth and easy like it should be.

Other nistunes no worries i think 460rwkw is the highest weve done so far.

[ARTZ]

Yep.

Search 'new RB parts with results'.

It's a write up of what the solution is and performed on my own car. It's not the ONLY option but it's off the shelf.

I did a search and found you on a UK site.. ...they also mention a remanufactured CAS..Are these a good option also?.

At what point does this become an issue anyway, is it only an issue when running big power, or can it assist to help any tuned car to run better...

[Hanaldo]

sounds weird the r34 ecus are the most stable platforms, have you got some logs to send to pete and matt? in 5years of nistune ive never encountered that issue. Im not saying there isnt an issue in this case but i reckon its traceable. have all the knock flags and feedback been switched off? has the rpm vs ign curve been checked against a stock definition? feel free to send the ecu over and i will check it over as i have a crazy nistuned r34 in the shop atm (350rwkw auto)

i have found on E85 thought the nistune for some R34's does not have enough adjustable parameters above about 350rwkw with 1000cc injectors and big plenum etc.. accel pump gets a bit steppy and cold start etc becomes troublesome... not factory smooth and easy like it should be.

Other nistunes no worries i think 460rwkw is the highest weve done so far.

Well the most likely reason for it is the TCS, or lack of it. As I transplanted this engine into a GT shell, at the time I decided to scrap the traction control as it was going to be a bitch to wire up and I had no use for it. Had been planning on going forward facing anyway, so I would have just had to delete it again anyway.

I wasn't aware at the time that it would cause so much trouble with DTC's. Even with the feedback switched off, the ECU would still pull timing. So after talking with Matt and Pete, I sent the ECU to Matt and he bench tested it and reprogrammed it with a SII Stagea image to get rid of the DTC's. Since then I haven't had it back on the dyno so I never 100% confirmed that this had been the issue, but it didn't once misfire since being reprogrammed, so I think that did sort it out. Then I decided that if I needed to get it back on the dyno anyway, I may as well upgrade to ID1000's and put on the Plazmaman plenum beforehand. And that brings us to now, with an ECU that no longer works

Edited April 27, 2012 by Hanaldo

[Piggaz]

I did a search and found you on a UK site.. ...they also mention a remanufactured CAS..Are these a good option also?.

At what point does this become an issue anyway, is it only an issue when running big power, or can it assist to help any tuned car to run better...

Search that in the forced induction section on SAU.

Some very informative posts that will explain all