Most Gtr Engines Rebuilt Within 12 Months?

[GTaaargh]

I met a bunch of Skyline owners last night. A nice bunch. One thing had me worried though. Most of the GTR owners had their engines fail within 12 months of getting their cars. The failures (broken ringlands, melted pistons etc.) were caused by lower octane fuel, detonation and poor fuel mapping.

I can understand how the fuel and fuel mapping could cause an engine to fail, but I thought the knock sensors would protect it from detonation damage. But the main issue is the proportion of owners who needed a rebuild.

Why aren't the knock sensors stopping the damage? Do motors die that quickly in Australia? Is this just a poor sample group?

[Busky2k]

Knock sensors only work to an extent and only can retard the timing so much. Also in some cars they only sense detonation at lower RPM and not full throttle/high RPM because there is so much 'noise' that the detonation sensor cant really tell what is what.

You come across people who dont really know what they're doing and just wind up the boost to be 'fully sik' and dont even know what detonation really sounds like so they just boost it until something drastically goes wrong.

A GTR engine is pretty darn strong and should last just as long as any other Nissan engine if its looked after properly and tuned accordingly. Anyone who gets a rebuild every 12 months a) doesnt really know the basic mechanics of an engine and thus B) shouldnt be owning a GTR if you ask me.

[BigMicky]

How many of these people that had their engines fail actually took them to a reputable tuning shop for a once over to make sure the tuning was correct for our fuel??

I'm guessing none.....

[Duncan]

:werd: double the b005t on a 15 year old car but don't do anything else....good plan

[Tommyk]

Reason why they die is because a lot of people import jap shitboxes. These cars have been thrashed by the japs, worth nothing, and are sold to aussies for top dollar. They are then thrashed over here, then the engines die.

It takes a fair bit to kill an rb26. The reason why they die is poor tuning, or just wear and tear. If well taken care of, they should last past 300,000 kms. Most of those 32 gtr's would have close to that if not more

[rob82]

All RB's knock sensor only functions between 0-4000rpm. Like busky2k said there is probably too much noise above this point so it doesn't operate.

That said I think everyone has made valid points. I have tuned my car on 98ron and if I run anything lower it detonates at full load. More people need to be wary of this!!!!! USE THE FUEL THAT IT WAS TUNED ON!!!!!!!!!!!!!!!!!!!!!

[paulr33]

All RB's knock sensor only functions between 0-4000rpm.  Like busky2k said there is probably too much noise above this point so it doesn't operate. 

That said I think everyone has made valid points.  I have tuned my car on 98ron and if I run anything lower it detonates at full load.  More people need to be wary of this!!!!!  USE THE FUEL THAT IT WAS TUNED ON!!!!!!!!!!!!!!!!!!!!!

<{POST_SNAPBACK}>

My knock sensor in my r33 RB25 seems to pick up knock readings until redline. The hand controller shows knock values and the engine light flashes when over 60. Is it getting the knock signal from some other alternate "detection" method over 4000rpm? How many of these "die in 12 month" cars are running stock everything? I've always read heat kills an engine. Boost x 1.5 = Heat x 10

[turbo33]

My knock sensor in my r33 RB25 seems to pick up knock readings until redline. The hand controller shows knock values and the engine light flashes when over 60. Is it getting the knock signal from some other alternate "detection" method over 4000rpm? How many of these "die in 12 month" cars are running stock everything? I've always read heat kills an engine. Boost x 1.5 = Heat x 10

<{POST_SNAPBACK}>

my pistons cracked, even thou it was running 12psi ( r32 89 gtr ) and it blew up... it said 112,000k but i think it really had 250+

i sold it with damage motor for a r33 gts and now i am making it turbo B)

i am scared of gtr because engine can fail because of high intake temp

[blk180]

my GTR died spun a bearing. Was frist regoed night off the boat and was running 12psi

[R31Nismoid]

All RB's knock sensor only functions between 0-4000rpm.  Like busky2k said there is probably too much noise above this point so it doesn't operate. 

they work through your wohle RPM range

Knock sensors wont protect at all. If your gonna knock, your gonna knock and the initial big one is the most damaging before the ECU (if at all) puls timing etc

Biggest problem is shit tuning.

Second biggest problem is cheap owners who dont have the tuning fix or arent willing to pay $$ for a decent tune.

And 3rd is the big end bearing. They tend to do those here and there if your tracking it. thats just ages

[rob82]

In a standard ECU they operate between 0 - 4000 rpm and up to about 1-2 psi of boost. Within that range if an engine detonates it will retard the timing. In most applications a knock sensor will retard timing before you even hear or see it.

[Cubes]

If the stock R32 GTR ecu is anything like the stock r32 rb20det ecu then the knock sensor will work up until 4000rpm or there abouts regardless of airflow.

It will however, dip and carry on that will take until 4500rpm or there abouts until power recovers.

Boost is not metered, its airflow that is represented as load.

Mine was pinging at 4000rpm on the stock ecu with 6psi, causing a massive powerdip that took until 4500-5000rpm to recover.

[rob82]

Thats right cubes I was just talking in laymens terms. I was actually wrong anyway, just had another look; a standard r32 GTR computer will activate the knock sensor between 0-4000rpm and a half to full voltage of the AFM.

[Beer Baron]

like R31 nismoid touched on the biggest problem is cheap, tight arse owners. they use cheap oil, the don't always use good fuel. they go cheap upgrades like winding up the boost without looking at other upgrades and they don't maintain the things properly. then they blow them up and cry. there is nothing wrong with a RB26 engine. if it is looked after (and i don't mean babied, just well maintained) then it will live a long, long life. obviously the only problem is with all second hand cars you don't know how it was treated before you got it.