VEMS WarmUp Enrichment settings

[button]

Hi.
I have one problem with my VEMS config.
When I start the engine when he is cold, rpm are horibly small (~500). I think that I have wrong warmup enrichment settings. Could someone write any checked and good working setting?

I use peter_jensen IAC valve config, and when engine have ~90*C rpm are good.
When I use only Ignition based idel control, on cold engine rpm are rolling up'n'down (form 500 to 1300).

[A80Avant]

yes please post something like this.
this is one of the things i want to be able to handle with vems accuratelly before i buy it myself!

[GTO]

its looks like PWM ISV or warm-up setting or both , i mount one vems to 3B and havent problem with idle, on cold got 1200, on hot 900 stable RPM.
post your conf or screenshots.

[A80Avant]

can you post your settings as well?

here are mine.it seems to be working for me now

http://www.s2forum.com/forum/showthread.php?t=34307&page=2

[A80Avant]

just tweaked the idle PW a bit today to have a better reaction on cold.Will report back.

general idea is at least for my car that i try to put the ISV into play just as much as required to keep EGTs on idle nice,withouth making the lamda less than 0.98 AND still have a good idle on voltage drops.

as isv hasnt got any different settings on cold/warm as far as PID is concerned, ignition timing will be doing most of the work am afraid.

at least the end result is rock hard stable idle!

[GazzaG60]

unless your egts are really high its not an issue at idle. what are they? IIRC i get around 350-400c. cant clariy yet as my egt probe has broken a wire and is returning gash figures.

the general principle is to have fairly high egt on cruise and idle to clean burn then richer on boost. the lean burn helps clean the plugs up too.

never seen a piston melt on idle. the first car i was involved with a fair few years ago had a supplied base map with too little timing that it burned a hole in the ported header. good job the header was thinner than supposed to be otherwise it may have been a short lived engine.

what were your figures from the motronic. never got a chance to baslien mine.

[GazzaG60]

i seen 1.05 at idle on the lambda. 1.05-1 on cruise. seems happy enough. i target 0.82 for the majority of my boost cells.

[A80Avant]

well on motronic on a cold engine i would get about 480C on the EGT located on the turbo hotside.After long runs and warm engine and coolant temp of 90 i would get no more than 550C

with the same sensor on vems i get 470 or something on cold but sometimes up to 680-600C on idle after heavy runs.It drops slowly down.But that was when i was basically having ignition based idle only. Now that the ISV+diode is working,i get closer to 550 mark.Maybe around 570 going closer to 550 after a while.

so 30C is not a big difference

[GTO]

I based on Marcell config, here is setting from one s2 which i set-up a month ago.
firm is 1.1.27beta6

[A80Avant]

so basically with these settings you have the ISV PID control essentiall off line.


are you using mostly the ignition timing to control idle then?

i still have to make changes for the cold start. I have managed on these settings i use now to stop the idle overshooting when it starts,but instead it just stays on 800rpm and the mixture is quite rich(probably due to the warm up enrichments).So i will have to alter that a bit to find a good solution.

also for some reason it seems to take a while longer to start now...Need to see why that is

[Bram]

Was this solved?

[A80Avant]

in my car yup! cold start, idle and warm start are ideal!

[Jamo]

What was done to resolve this? Part spark part idle valve idle control?

[A80Avant]

yes, pretty much.

[Jamo]

I based on Marcell config, here is setting from one s2 which i set-up a month ago.
firm is 1.1.27beta6

Cool, I might try these settings and see how I get on