Idle issue on Vems.

[popdemonic]

will do it again tomorrow mate.it' s now 21.30 here in Thailand.don't forget to get the quote for chipset then i can let my friend knows.

[Wrath]

Hmm don´t want to bust your thread but have the same problem except it´s high instead... it hangs on 1200 rpm for a while everytime i press the clutch or sometimes is more accurate.
And when cold it´s always high but that i think i know why. When AC is on the rpm is solid 950

[popdemonic]

@Wrath,

If i switch the ac off,the rpm will stay around 1050-1100rpm.personally,it's too high for me.try decreasing IAC Ref Curve for 1% to see if your

rpm drops?

[kotnelson]

Idle issue on Vems.

Yeh yeh yeh
Krieng did it this morning. Idling with 8 BTDC @ 750 rpm ahaha
I talk with him to increase to 860 rpm and do some fine tune.
Lets wait a few days, allow him to get thing done and he will post what he did with POP.

Next....to tune for PPO with 38 BTDC

--------------------------


Agree with PRJ on the theory.
AAN idling best on low ign timing.
High idling mean somethings not recover btw HW or SW

[Wrath]

Pop:

I see, my curve starts up at 80% or something and drops as the engine heat goes up.
It aint as flat as yours.

But I have never had any RPM drop ever... maybe I should post my settings and compare them with yours

[KRIENG]

750 RPM and 8 Spark Angle can do.

1 hour to tune on road but not complete

pls see in log file
at begin drive like normal
at the end tune AC Off,On,Off and turn the steering wheel left and right

Remark new N80 form A4 1.8


______________________________________
UrS4 MT Y92 Rs2 Turbo.EM e-bay(someone call LOG).
Vems (RS2 Replica injectors, 1.9 BAR Spring).
LS2 coil kit EFI Express.NGK Iradium BKR 9EIX.HKS BOV SQVII.
Cayenne front 6 port rear 4 port(hand break modify).
HOTBITs Full customized suspension/eibach springs.Oettinger RE 18".
Exhaust 2x2.5" stainless steel(no Cat). FMIC 105%

[Billman]

Since we are talking about idle:

what idle settings do you use when the car is idling with heat soak? I have noticed that when the IAT goes at 63 degrees I must enrich the fuelling very much (MAT/TPS correction) in order to have it correct.

How is that setting in motronic?

The logic says that when the IAT raises the fuelling must be lowered because of less oxygen but on the car the opposite happens (at least on idle).

[prj]

Since we are talking about idle:

what idle settings do you use when the car is idling with heat soak? I have noticed that when the IAT goes at 63 degrees I must enrich the fuelling very much (MAT/TPS correction) in order to have it correct.

How is that setting in motronic?

The logic says that when the IAT raises the fuelling must be lowered because of less oxygen but on the car the opposite happens (at least on idle).

Motronic is mass-flow based, so such problems do not exist.

[Billman]

Motronic is mass-flow based, so such problems do not exist.

still,

does the inj DC goes up when idling with very high IATs?

[prj]

still,

does the inj DC goes up when idling with very high IATs?

No, it does not need to, unless your voltage is fluctuating and your injector latency is set wrong.

[Billman]

No, it does not need to, unless your voltage is fluctuating and your injector latency is set wrong.

nice thanks

[popdemonic]

I ended up deciding to purchase brand new Bosch ISV since i'm confidenced my cofig is now good enough but the idle is fluactuating.it sits way
different RPM no matter how much i tried to tweak it.

[QuattroFever]

Keep us updated. I'll be interested to see if it's the effects of a bad isv.

[popdemonic]

sure, i will be updating if finally i sorts out the culprit. for anyone who getting the bad idle,unstable lambda on idle.

it' ok if you keep the idle aobe 900rpm but once if you want to keep the idle lowered.I assumed our car are now over 15

years on clock.pull off the N80 if it's leaky,get the one.it helps a lot to tweak the idle.I and Krieng found this by luck.

Paid it for few bucks and it saves 3months for tweaking on it.I used the black N80 taken from the later A4.it works out well

but you need a bit bigger on the silicone vacuum hoses.

[KRIENG]

Pop and me found

New N80 from A4 1.8T is oneway valve so idel no more air leak
(Vems Not control N80 if you want to control it by AUX pin)
and check vacuum line N80 to Canister tank to black&white valve

now idel better smooth


Problem: when deaccelerate RPM go up and down before set to idel RPM especially 1,2 gear.
afterrun fuel cut,resume 1500,1200
ing cell before idel RPM closer idel RPM