513 replies to this topic

[Exmantaa]

I'm happy with everything below 50*C on track. Now it gets above 80 if pushed on track... :-/

[CHILL Gone DUTCH]

I'm happy with everything below 50*C on track. Now it gets above 80 if pushed on track... :-/

I will try and get data with it on and off But really need to get this knock sorted first if weather permits I'm sure i will get it reduced then it will be used I don't like leaning on the safety I prefer not to have it to start of with

[Bakazan]

Why are you getting knock with the extra cooling of the charge? Isn't avoiding knock the whole point of adding WI in the first place? (Not being critical just interested to know what's happening)

[CHILL Gone DUTCH]

Why are you getting knock with the extra cooling of the charge? Isn't avoiding knock the whole point of adding WI in the first place? (Not being critical just interested to know what's happening)

The reason for the water injection is to reduce the iat Knock was not a issue before Because the burn rate has changed ( slower ) then the ignition of the fuel at the right time has now changed I'm hoping it's just a case of finding the correct point to start the ignition of the cooler mixture, This was no different from what was required when we do are ignition on a no water ignition situation

[smiley]

iirc your map had an extremely good flatline on the knock (ie 0.5 max everywhere)

Where did the knock start appearing? On all rpm's? Big spikes, or just above 1?

 

[CHILL Gone DUTCH]

It seems to be almost everywhere when the WI is active but because the water is not a constant over the hole Rev range it's quite a process to find the required ignition Lucky for me the weather is looking good today so let's hope things can be sorted

[CHILL Gone DUTCH]

I'm seeing highs of 5s now smiley Which I'm not comfortable with

[CHILL Gone DUTCH]

The problem with KR especially if/when your running to low inition is it creates even more knock

Edited by CHILL Gone DUTCH, 30 September 2016 - 08:00 AM.

[Bakazan]

 

Why are you getting knock with the extra cooling of the charge? Isn't avoiding knock the whole point of adding WI in the first place? (Not being critical just interested to know what's happening)

The reason for the water injection is to reduce the iat Knock was not a issue before Because the burn rate has changed ( slower ) then the ignition of the fuel at the right time has now changed I'm hoping it's just a case of finding the correct point to start the ignition of the cooler mixture, This was no different from what was required when we do are ignition on a no water ignition situation

 

 

Why do you need to reduce iat? I assumed it was to stop the ecu retarding the ignition to protect the engine from knock at high iat (and hence reducing power).

[smiley]

I'm seeing highs of 5s now smiley Which I'm not comfortable with

 

Outch, that's bad.

 

[CHILL Gone DUTCH]

  Why do you need to reduce iat? I assumed it was to stop the ecu retarding the ignition to protect the engine from knock at high iat (and hence reducing power).[/quote] My car can lose a estimated 30-50 HP over a run because of iat

[CHILL Gone DUTCH]

Here is some data for you smiley 

 

 

yesterday i managed to reduce the knock between 4500 rpm and 5500 rpm but the higher up rev range the same amount of ignition had very little effect on the knock, but this is where the water rate increases with the fuel injector cycle 

 

and this is only the WOT areas there is still the low load stuff

Edited by CHILL Gone DUTCH, 30 September 2016 - 08:20 AM.

[Zoobeef]

Will you be getting an even spread of water in each cylinder injecting at each side?

[CHILL Gone DUTCH]

Will you be getting an even spread of water in each cylinder injecting at each side?

 

in my logs the you can monitor each cylinder for knock and its consistent over all the cylinders so at the moment im going to say yes but i have had this in the back of my mind 

 

and monitoring accordingly 

[CHILL Gone DUTCH]

 

thats better

[CHILL Gone DUTCH]

 

 

[Exmantaa]

So (till) how much you needed to raise ignition to get rid of the knock?

[CHILL Gone DUTCH]

I will have to work it out as I've added a lot now in small doses at a guess it's around 3 degrees but will add it up propably later I'm going to add a little more now see how it goes

[Exmantaa]

Curious to see where it ends up.

(For the 2.0 engine the optimum ignitioon is somewhere around 24 degrees (on E85...) before it doesn't make any more power, but will check that number)

[CHILL Gone DUTCH]

ive now added over 4 degrees of ignition on top of what i put on over the two days 

 

 

but knock is looking a lot more acceptable