Knock fix with Australian Fuel 98/100 RON

[Fizz]

Thanks....that's reassuring. Yeah I've informed James and he's just sent me an updated map with slightly richer AFR to err on the side of caution.

[steve99]

Originally Posted by Kodename47

The dyno O2 sensor will be exposed to more ambient air and is after 1/2 cats depending on your exhaust configuration so it will read leaner probably by a good 0.1-0.2 AFR points minimum. As for which one to trust, that's down to you. I've heard reports recently of someone I know having 3 sensors in the exhaust pre-cat (inc. 1 OEM) and one in the tail pipe. They all read differently, so again, do you trust 1/none/all??

Feed it back to James and see what he says. So long as its not knocking I don't see an issue so long as you're not lean at the top end, which you're not.

sounds fair

[jamesm]

I never trust dyno widebands. I've seen them read anywhere from 0.5-1AFR point lean. Never seen one actually read the same as an installed sensor. No knock on that tune... still need to do some tweaking though. E-tuning OFT is a major PITA, very hard to 'get right' fwiw lol.

[stevo585]

Originally Posted by jamesm

I never trust dyno widebands. I've seen them read anywhere from 0.5-1AFR point lean. Never seen one actually read the same as an installed sensor. No knock on that tune... still need to do some tweaking though. E-tuning OFT is a major PITA, very hard to 'get right' fwiw lol.

Curious how accurate is the AFR reading from the ECU via the ODB port? Is it narrow band or wide? For example if you ran the torque app...

[s2d4]

Originally Posted by s2d4

also appears to target the same from cl to ol.

This isn't true, it stays in cl much much longer, changes over to ol from 5600rpm onwards. Interesting.

[steve99]

Originally Posted by jamesm

I never trust dyno widebands. I've seen them read anywhere from 0.5-1AFR point lean. Never seen one actually read the same as an installed sensor. No knock on that tune... still need to do some tweaking though. E-tuning OFT is a major PITA, very hard to 'get right' fwiw lol.

Sounds fair with dyno wideband shoved up exhaust as oposed to one fitted in front bung pre cats.

Re The E tuning with OFT (NA car) is something lacking in logging/parameters or accessible tables (but thats Romraider) ? or it it just E tuning in general as you have to wait for results and you carn't just fix things on the fly as soon as you see/hear/feel it like when car is on dyno or your driving it ?

[tech86]

Did some logging of my stock tune on 98 (Shell), start of it is a 3rd into 4th gear run onto the freeway. Unless I'm looking at it wrong, this is showing the slight knock you talk about on stock tunes?

http://datazap.me/u/tech86/stock-tune-a01g-trimmed-log
http://datazap.me/u/tech86/stock-tune-a01g-full-log (same thing with more parameters)

[s2d4]

Originally Posted by tech86

Did some logging of my stock tune on 98 (Shell), start of it is a 3rd into 4th gear run onto the freeway. Unless I'm looking at it wrong, this is showing the slight knock you talk about on stock tunes?

http://datazap.me/u/tech86/stock-tune-a01g-trimmed-log
http://datazap.me/u/tech86/stock-tune-a01g-full-log (same thing with more parameters)

Your knock event is prior to the log.
It is actually adding timing back in.

[tech86]

The entire log was 5mb, have to do some more later with smaller windows.

[Fizz]

Originally Posted by tech86

Did some logging of my stock tune on 98 (Shell), start of it is a 3rd into 4th gear run onto the freeway. Unless I'm looking at it wrong, this is showing the slight knock you talk about on stock tunes

Stock tune is very prone to knock even with 98 RON. It gets worse in summer....knocking everywhere. But a good tune can greatly reduce this. Alternatively you can run on 100 RON as this is known to improve things as well.

[steve99]

Originally Posted by tech86

Did some logging of my stock tune on 98 (Shell), start of it is a 3rd into 4th gear run onto the freeway. Unless I'm looking at it wrong, this is showing the slight knock you talk about on stock tunes?

http://datazap.me/u/tech86/stock-tune-a01g-trimmed-log
http://datazap.me/u/tech86/stock-tune-a01g-full-log (same thing with more parameters)

If your car is manual just flash the 98 ron tune in first post or 100 ron if you use United 100, if your auto just copy across the Base timing B table to your auto OFT tune

That will pretty much eliminate the knock

[myioz86]

steve99 just wondering if using torco octane boost to bring up the octane ratting of my fuel would help with this fuel problem here in australia. That way might save a bit of knocking in these engines or am i incorrect.
Thanks john

[steve99]

Originally Posted by myioz86

steve99 just wondering if using torco octane boost to bring up the octane ratting of my fuel would help with this fuel problem here in australia. That way might save a bit of knocking in these engines or am i incorrect.
Thanks john

Anything to boost the octane should help, as long as you follow manufacturers (torco) directions should be fine.

Have you tried united 100 octane fuel ??

If you have non-ethanol 98 octane you can add 10% or so of E85 this can boost your octanne rating a couple of points.

[myioz86]

we cant get e85 or your ron100 up here in cairns so my only option is to boost up the bp ultimate that we can get . might log a run then add torco when i get it and do another log then compare them.