[CU2] Does your car have an issue with a "post-combustion detonation sound"?

[timetorelax]

Mine is definitely pinging now whoops I mean post-combustion detonation . I definitely did not hear it from new but I started to hear it after hitting 6000km on the clock. It's pretty obvious when the engine is reving around 2500rpm in 5th gear before changing down on a hill. At the moment I'm not too worried but I guess I should notify Honda.

[primetimex]

Quick update on post combustion noise: seems the noise is more prevalent when I'm filling up with Caltex Vortex 98 than if I did with BP Ultimate. With the Ultimate most of the time the noise is so faint / non-existent that I can't even hear it even with the soundsystem off!

[aaronng]

Quick update on post combustion noise: seems the noise is more prevalent when I'm filling up with Caltex Vortex 98 than if I did with BP Ultimate. With the Ultimate most of the time the noise is so faint / non-existent that I can't even hear it even with the soundsystem off!

I wonder if Australian fuel is really that shit. The CL9 had different tunes for each region (US, EU-AU, Japan), while the CU2 is the same for all regions.

Has anyone taken the dive and tried 100 RON ethanol mix from United?

[primetimex]

I wonder if Australian fuel is really that shit. The CL9 had different tunes for each region (US, EU-AU, Japan), while the CU2 is the same for all regions.

Well that is quite interesting, that CU2 is the same tune for all regions. If that is the case then I don't even want to know what 95RON fuel will do to the CU2 engine. Overall post-combustion noise aside, the Ultimate seems to provide best power / responsiveness ratio vs the Vortex 98 - bar the cost of fuel which has just jumped to $1.27 overnight from $1.12 here in Perth.

Unfortunately 100RON is not available in Perth - unless anyone can tell me otherwise?

I used to mix'n'match Vortex 98 with Ultimate as Caltex is just nearby my place of work and the nearest BP is on the other side. Now, I think I'll just stick with BP Ultimate exclusively unless I go broke.

[Sludge]

Well that is quite interesting, that CU2 is the same tune for all regions. If that is the case then I don't even want to know what 95RON fuel will do to the CU2 engine. Overall post-combustion noise aside, the Ultimate seems to provide best power / responsiveness ratio vs the Vortex 98 - bar the cost of fuel which has just jumped to $1.27 overnight from $1.12 here in Perth.

Unfortunately 100RON is not available in Perth - unless anyone can tell me otherwise?

I used to mix'n'match Vortex 98 with Ultimate as Caltex is just nearby my place of work and the nearest BP is on the other side. Now, I think I'll just stick with BP Ultimate exclusively unless I go broke.

I have just done a Sydney/Melbourne and back trip. Started with a tank of 98 octane Shell and had a little bit of pinging on day one (I have never had it bad). I filled three times with 95 octane (Mobil and Caltex I think), twice in Albury and once in Melbourne and I have had no pinging at all.

Don't profess to know why but thinking back it seems to me I only notice the ping when I have a tank of Shell 98 octane on board? By the way the worst economy I had was on the first tank also, and there was limited Metro driving that day.

[Type R Positive]

I used to mix'n'match Vortex 98 with Ultimate as Caltex is just nearby my place of work and the nearest BP is on the other side. Now, I think I'll just stick with BP Ultimate exclusively unless I go broke.

Stick with the Ultimate mate, it's made here in Perth.

[primetimex]

Stick with the Ultimate mate, it's made here in Perth.

Yeah will do thanks mate. Had been running Ultimate when I had my 350Z, and I think trying the Vortex 98 made it slightly worse.

What to do - just gotta pay the "Ultimate" price I guess.

Sludge and Aaronng's posts made me think that the CU2 engine maybe far more sensitive to fuel RON that we might think - despite the manual stating that it can run on 95RON - I don't even want to think what running Shell 95 will do on it!

What do you think of BP's 95 premium Type R Positive - do you think in times of high prices it is an acceptable tradeoff to Ultimate?

[aaronng]

It would be good if someone with a pinging CU2 becomes a guinea pig and test a tank full of 95 RON, say BP premium. It would open up a world of discussion and 95 vs 98 RON again if the pinging issue was solved with 95 RON.

[unity]

Yeah will do thanks mate. Had been running Ultimate when I had my 350Z, and I think trying the Vortex 98 made it slightly worse.

What to do - just gotta pay the "Ultimate" price I guess.

Sludge and Aaronng's posts made me think that the CU2 engine maybe far more sensitive to fuel RON that we might think - despite the manual stating that it can run on 95RON - I don't even want to think what running Shell 95 will do on it!

What do you think of BP's 95 premium Type R Positive - do you think in times of high prices it is an acceptable tradeoff to Ultimate?

This is unrelated to the pinging issue however in the last few weeks I have started using Vortex 95 on the advice of Buddah (thanks buddy) and have found no difference in the fuel econony when compared to using BP Ultimate 98. Car feels no less responsive.

[Sludge]

This is unrelated to the pinging issue however in the last few weeks I have started using Vortex 95 on the advice of Buddah (thanks buddy) and have found no difference in the fuel econony when compared to using BP Ultimate 98. Car feels no less responsive.

Hmm, interesting!

I'm not moving away from 95 again, it just seems to be happier car with it.

[Type R Positive]

What do you think of BP's 95 premium Type R Positive - do you think in times of high prices it is an acceptable tradeoff to Ultimate?

I have only used 95 a few times as a top up only in my CU2.

I used to use it a fair bit in my ex '07 Corolla, but I swear I got better fuel economy with the Ultimate. I really don't know about power?
I am of the understanding that it is of a way better quality as well.
It might be just marketing, but for the $3 - $5 saving a tank you would get with 95, I prefer to stick with Ultimate in my CU2.

It's like that Ultimate diesel. It might cost 10c+/L extra, but my Prado absolutely loves it. It gives it more power, and more economy. It costs me like another $20 a tank, but I can only get it in Perth, so it is like a treat for my car!

They do say that you should use minimum ron possible for power though, but I think there is more to it than that.

[SteveH]

Mine is definitely pinging now whoops I mean post-combustion detonation . I definitely did not hear it from new but I started to hear it after hitting 6000km on the clock. It's pretty obvious when the engine is reving around 2500rpm in 5th gear before changing down on a hill. At the moment I'm not too worried but I guess I should notify Honda.

That sounds exactly the same as mine now. I only started to hear something around the 5,000 k mark. (Mine is a manual by the way) Mine sounds like a metallic rattle, almost like a cam chain rattling or something. (I know thats not what the noise is, just trying to describe the sound)

I found that my car was worse for both economy and rattling noise when I used Etahnol blended 95 octane petrol