Ok Guys,

Well i want to get my idle a little better, ill try and explain the best i can and attach screens of my current settings.

The Car idle's good, and brap's brap's fine, then it will start to stumble and then brap again.

What i want to do is try remove the stumbling and have a constant brap. (hope that makes sense).

Ive made changes so now the car idles with the AC on, which im stoked about, AC On idles around 1k, i adjusted the AC On idle parameter and adjusted the steps, increasing them by a bit.

Here is a Youtube vid of how my car idles, note the braping then the stumbling

http://www.youtube.com/watch?v=jDApDiA8WNg

Now i have improved this a little by adding 2 degrees more timing at idle and a little more fuel, i also increased the ISCV steps a little at idle too.

Ive read an i know the computer at idle runs in Open Loop

Tonight i tried to stop it from doing this by changing the Open Loop Throttle to 0 between 500-1000, this made the car not brap at all and was idling like stock, im a little bit of a boy racer and want it braping the way cams should, i played with the fuel now that it wasnt in open loop on idle but still couldnt get it to brap.

I changed it back the car is now running open loop for idle and 10 degrees of timing at idle.

Attached are some screens

Hope i can get some info, or if my issue can be helped, also sorry for the long *** post!!

 

hey, a stock car will idle in closed loop (aiming for the 14.7 stoich afr). how are your fuel trims? also throwing it into a forced open loop may help. either change the open loop load 1 &2 below your idle load. so 25 should be good. or as you did throttle position . that method always made my car act funny. and wouldn't reference too the afr map. now if you have a wideband what afr did you see the car hitting at idle open loop(afr map refrence) ?

 

i have the same issue with my kelford 272's, i here our cams are similar... let me know if u figure out ur issue, I have accepted the fact my car does that... Let me ask u this, can ur car idle with the AC on? Mine idles like a beat up lawnmower with the AC on

 

How much vacuum is the engine pulling at no load idle? More overlap definitely likes richer mixtures and sometimes more timing.

 

When i made the car idle in open loop the car would idle at 12.5-13 AFR, i made changes to the fuel map when it was running like this and seemed to make no difference.

I have got the car to Idle perfectly with the AC on, PM me if you want my AC Maps.

The Engine is pulling around 8-10 vac on Idle and ive got it set to 10 degress of timing, previously was on 8 i added a little and increased the ISCV steps at idle and it has improved

 

bump up the timing to like 12* to try and pull a little better vac.

 

Will try that tonight, thanks mate

So more vac = more timing at idle = more constant Brap?

 

For me on S1s more timing equals less lopey idle and or "brap". It is smoother. I am also running a higher rpm. When I had timing low and slower idle it was very lopey. Which was cool sounding.

 

Yeh i noticed that, i added 12 degrees timing and seemed as though it didnt idle as good.

Ive tried 8 degrees before and it didnt sound as good, i think 10 degrees for my setup its liking it.

I think ill leave the idle the way it is in that video it was on 8 now its on 10 sounds much better.

Now is there any advantage of adding negative timing for launch control, i know it sounds cool but does it build boost any better?

 

what is your idle rpm set to?

I ask because often people will set the timing at one rpm and their idle has to interpolate between the set value and the next set rpm timing settings. I found that lowering the 1500 rpm timing will help idle greatly if your idle rpm is set around 1000.

 

My target idle is set to 1070, although evoscan logs never show it hitting 1000, its always around 850-950

 

OK....you need to raise the ISCV table values in the last 2 cells. Also, you need to do a BISS adjustment. Then all should be good.

 

Ok cool thanks, i have raised the last 2 cells and it did improve ill try raise them again.

Ill also look for the correct way to do the BISS adjustment.

Cheers

 

Hi!
An idle running depends on the settings adjustable cam gears, more vacuum at
idle run. What settings for cam gears or zero labels? My idle settings is
950 rpm, timing 13* and 13-13.6 afr on wideband. The idle running is good.

 

Well put!