New Cooler Fitted, More Knock??

[DJ_L3ThAL]

yer yer i did the remount of the PFC the other day

[JimX]

Since you have a PowerFC can't you just add in a bit of fuel on your map manually? Or back off the timing slightly.

[Steve]

Just retune the bloody thing.

A good cooler will make a pretty huge difference to AF ratios. The air will be denser, therefore mixtures leaner = more detonation.

Usually when you get an aftermarket ecu tuned the AF ratios will be set with minimal tolerance to change. The new cooler is providing a better cooling therefore denser charge air, there fore more detonation.

Either that or its a shit cooler and you are getting very warm air through - but I doubt it:D

Either way - get it tuned. And it probably wouldnt hurt to do your fuel pump at the same time, just to make sure. Its pretty disapointing when you get a car on a dyno for a tune and then have to start winding back boost because the fuel system cant cope.

[DJ_L3ThAL]

nah coioler is definitely not shit coz i went out and drove around, then stopped, ran out and felt outake end tank and it had friggen condensation on it, ok it was a bit cool outside but it was ****ing freezing, the other cooler i had was *cold* but was never this cold, so i'd assume the better flow and cooling is causing it, oh well now i gotta get someone to retune it for me

and jimx yes that can be done but i dont want to **** around with it, rather pay a pro and get it done on a dyno

[Guilt-Toy]

go to settings and go to ign/inj and take out some timing. go to -3 and see how it goes.

take note that once you stop the car the setting resets back to 0 again so you have to do it again.

Also try chucking more fuel in it to. raise it in small increments and keep an eye on your knock sensor.

[JimX]

I have a question about the RB25's knock sensors and PowerFC readout - as I understand it, there are 2 sensors in the block which "hear" the knock, is that right? Do they detect knock in any of the cylinders or only the ones they're adjacent to?

And since the stock ECU doesn't give you a readout, how would you ordinarily be able to tell if the engine is pinging?

[Steve]

It hears vibrations. more sensitive to the adjacent pistons, but it will detect from all of them, depending of course on the amplitude of the detonation.

You can still hear knock (although some people, it appears, cant) I have found the power fc detects it before I can hear it.

You can get aftermarket knock detectors that just tap into the signal from the knock sensors as well. A really good idea if you get management without knock warning.

[Sydneykid]

Hi JimX, you asked "And since the stock ECU doesn't give you a readout, how would you ordinarily be able to tell if the engine is pinging?"

The dash warning light flashes.

[JimX]

Thanks Steve. It's the unaudible pinging that I was concerned about (as are we all, I'm sure).

Edit: And thanks Gary too

[Steve]

Originally posted by Sydneykid

Hi JimX, you asked "And since the stock ECU doesn't give you a readout, how would you ordinarily be able to tell if the engine is pinging?"

The dash warning light flashes.

On stock ECU? and to clarify do you mean check engine light?

[DJ_L3ThAL]

ok, pinging wqhen its real bad sounds like a 'tick tick tick' in thew erngine bay, trust me if its bad enough to hear it BACK OFF.. but the powerfc detects unaudiblew pinging which needs to be taken out with tuning, basically i think anywhere above 60 on the powerfc knock is very bad and needs to be tuned down, when mine was running awesome with the old cooler freshly tuned i was getting 30s MAXIMUM on high boost with full 4th gear load