Nismo Factory Sports Resetting R33 Gtr

[livewire]

Hi guys/girls, I recently went through a box of car parts and came across the factory ecu that came out of my Series 2 Stagea Autech 260rs and noticed the ecu has nismo factory sports resetting stickers on it. I've tried searching the forum here and also google but cant seem to get any decent answers as to what the sports resetting did/changed etc. Can anyone help?

Thanks

[Sovereign337]

The Nismo sports resetting ECU is a factory unit that has been tweaked by Nismo, my mate has an S1 350PS version in his R34.

Basically it removes the speed limiter and raises the boost to 1 bar as far as I know, so a very light tune for a standard car.

[livewire]

Ahh I see. So in saying that would it still increase boost to 1 bar with boost restrictor still fitted?

I take it this wouldn't be a bad option for a car fitted with just a front pipe back 3" exhaust then?

Would there be much point cost and performance gain wise buying something like a power fc or getting a nistune done with only exhaust upgrade?

And does anyone know whether these 'nismo sports reset' ecu's can be nistuned?

Thanks

[XRATED]

I wouldn't count on anything with an unknown ecu. If you have limited mods then plug it in on a dyno and see how it goes???

If your planning to plug it into your r34gtr then I wouldn't.

Most of the time you can't nistune a 'tuned' rom ecu from Japan.

I would buy a nistune for your current ecu and have your car tuned by a professional, with your fuel of choice, to suit the intended purpose and climate. You would see some solid gains even with just an exhaust with a decent tune.

Cheers

J.

[livewire]

Fair enough. Yeah I could try that I guess. I just figured all the nismo factory resetting would be the same tune for all of them being apparently only 1 bar of boost as opposed to factory boost pressure. Im guessing that a little extra boost is all you really get with it as the speed limiter removal isn't really a gain. In saying that the boost is increased to 1 bar, why is there so much debate on removal of the boost restrictor being 'risky' considering it increases the boost to roughly 1 bar too so if nismo are happy to do it from the factory as a reset, you would think it cant be too unsafe?

Any idea on what the general cost of a nistune should be?

[XRATED]

Not all nismo tunes are the same, you wont know what the timing, fuel or boost parameters are until you try it.

1 bar is normally considered pretty safe on a stock tune... it just wont be ideal in terms of tune.

Nistune is around 400 for the board and 100 for install plus tuning.

[GTSBoy]

Actually, with the RB26 Nissan pretty much always intended it to run 1 bar boost, and the ECU was pretty well mapped for it. The boost restrictor is really only installed from the factory in order to pay lip service to the 280ps gentlemen's agreement that the Jap manufacturers had. That's one reason why the restrictor was marked on the hose with a line - to make it easy to find and remove once the car was bought and no longer subject to the gentlemen's agreement!

Pretty much everything about the RB26 was intended to be a 400 HP engine, including the tune.

The Nismo maps might be slightly different - but I wouldn't be surprised to find that the 1 bar boost on the Nismo cars with that ECU was courtesy of a different (removed) restrictor rather than anything in particular with the tune. And because it was Nismo, and therefore effectively Nissan, I wouldn't be surprised if the ECU was Nistunable. I wouldn't spend money to find out, but it would be a reasonable bet.

[livewire]

Thanks for the posts guys, interesting stuff.

To me it seems that 1 bar boost wouldn't be possible via a 'reset' ecu if the boost restrictor is fitted anyway would it?

One would have thought the 'reset' tunes were all the same from factory as the cars would all have been sold with the same factory setup in regards to exhaust etc unless nismo exhaust systems were a factory option which the ecu's were reset according to if these options were fitted for the buyers.

Any opinions on whether getting a nistune board fitted and a custom tune as opposed to even a used power fc would be more beneficial as I imagine the tuning time and costs wouldn't be much different and ive seen power fc's and hand controllers sell as low as $600/$700

Edited June 8, 2014 by livewire

[livewire]

Anyone? Lol

[Blackkers]

If you've got the stock snails run the stock ecu. Pull the boost restrictor out though.

Also these cars are old now, no denying that. Get it checked on a dyno incase the AFR's aren't acceptable or if its knocking. Also get them to set your base timing while you're there.

That way you will know for sure if its safe to run that jap-tune which are often quite knife edge in terms of timing.

Plus you'll get a sweet dyno sheet to show your facebook mates how big your dick is

[livewire]

Thanks for the advice. Yeah. Definitely wouldn't go just chucking a reset ecu in and driving round hoping for the best. Was just wondering whether they were all 'reset' to the same specs and can't quite see how an ecu would adjust boost pressure with the restrictor still in place. Might remove boost restrictor at a workshop and get it put on the dyno and get the shop to try both ecu's and see if they can tell what differences they can pick up in the nismo reset one as opposed to factory untouched one.

[Sovereign337]

My mate's 34 GTR came with the sports resetting ECU which other than that was completely stock. We did some testing and it does indeed run 1 bar with the restrictor in and up to 1.2 with it out.

[livewire]

Ah cool. What boost do the 34 GTR's run standard then? around 10p.s.i?

Would be interesting to know how much difference it makes over standard ecu and how the mixtures and timing look compared to factory tune.

[Sovereign337]

I'm fairly certain R34s run 0.95 bar standard, my R33 runs 0.85 so 12.5 psi and around 13.5psi respectively.

The sports resetting "S1" unit supposedly is setup for 350ps but which isn't much more than stock but it's something. I'd say with minor mods the benefits increase, there might be some slight mixture or cam adjustments but they would be very minor I imagine.