Some of you may know I was previously running the Ralliart map, but I was running too lean with it, however when I did logs of it a while ago before getting my wideband everything else seemed fine, no knock or anything.

When I got my wideband I did some logs with the stock map & the Ralliart map, the stock map has knock counts no more than 2, where as the Ralliart map is giving knock counts of up to 7 in some places!

It's fine in 3rd & 4th gear, the worst parts are in 1st & 2nd on full throttle at about 3000 RPM. How did I not get any knock with the Ralliart map previously, and now I'm getting a lot??

Could it be phantom knock? Guessing the only way to tell is by using a set of det cans, yes? Or is there any other way?

Also, would things like worn plugs cause knock, or is it purely down to too much timing advance? If it is purely down to timing advance, then how come the Ralliart map (which is not overly aggressive) giving so much knock?

Cheers!

 

You can tell if its phantom knock by lowering timing and adding fuel where its knocking.

If it goes away its real knock.

Since you are knocking with the RA map and not with the stock, it most likely real knock.

I difference of 1 degree timing can cause knock.

 

Right, something isn't right here. I went and flashed my car with a Ralliart ROM that is using stock 5 GSR fuel & timing tables.

When I did that I got knock counts of 8!! So I stopped off, re-flashed the car with the stock map, and I only got a knock count of 1!!

How can that be possible? They are both using IDENTICAL fueling & timing tables for both high octane & low octane.

Is it possible that in the Ralliart map they made the knock sensor more sensitive than the stock map? Hence why it's picking up more knock?? There is something on the Ralliart map (bar timing & fueling) which is causing these high knock counts. Might try the Ralliart timing table on a stock 5 GSR map and see what happens.....

Also, I have an old log (from 16th August) of the Ralliart ROM, and the most I got back then was 3 counts of knock. How has it magically increased for no reason? The thing is, even if it is phantom knock, I can sometimes feel the car hesitate where the ECU is retarding timing which can't be good for the engine, even if there is no actual knock.

Cheers!

 

post up a log. umm also look it over if the timing is off in the areas where it knocks then its real. 3 counts retard by 1* so 8 count would retard by by around 3*.

 

I posted up on MLR and asked. One of the geekmapped guru's (GrayW) said from looking at my logs it shouldn't be much to worry about because I was at TPS 48% with 19* timing so most likely in a low load area.

Just to be safe I've decided to copy to Ralliart ignition tables & boost cut setting to my stock ROM and will test it out tomorrow.

Also, retarding the timing does not mean it's defo real knock, even phantom knock will retard the timing because the ECU still THINKS there's knock where there isn't.

I have upped 3 ROMS & 3 logs to megaupload in 1 zip file. You can see on the stock ROM I get 3 knock counts, on the Ralliart with stock fueling gives 5 and the Ralliart with stock fueling AND timing gives 8!!

http://www.megaupload.com/?d=5LQ9BQY7

 

Hello

I did some log how in Merlin Ecuflash book read ! Logged knock adc and knockbase rpm and knock sum. My problem is seems like have some phantom knock.. the CEL is flash the knock sum show me 6 but the knock adc graph is under the knockbase ?! How coud these happen ? In the merlin book i red that knock sum will show "knock" if the knock adc is over the knockbase ?!

 

I did a lot of log today and played with multiplier and knock load settings.
I just rev up the car in neutral gear from idle to rev limit with the stock setting I got 36 knock sum on the stock evo fuel and igniton map. It shoud have phantom knock..

Than I increase the multipliers settings and I can see only 8 knock count.. To clear knock I had to raise the settings so much ! Low multiplier 17 and the mid and high is 24. From 2500to 3500rpm I set load 100. Is it normal ?! And sometimes I have some knock count from 5500-7000rpm !