Idle problem on Deka's 630cc.

[mushasho]

As soon as you get guay 4bar FPR on I'll shoot you my file

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[popdemonic]

As soon as you get guay 4bar FPR on I'll shoot you my file

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sure,it'll be a long holidays Friday onward.I'll have a plenty of time messing around my car El.

[popdemonic]

Anyone can look up my idle logs please.The engine stalled , idle lumpy all the time while the pulsewidth hunts up and down.This problems happened only if the IAT(MAT) went up 70c+.I'm going to try the 4Bar FPR not sure if the Deka
has any problems at 1.9-2.0ms PW?

[Marc]

Anyone can look up my idle logs please.The engine stalled , idle lumpy all the time while the pulsewidth hunts up and down.This problems happened only if the IAT(MAT) went up 70c+.I'm going to try the 4Bar FPR not sure if the Deka
has any problems at 1.9-2.0ms PW?

if the problem only happens for you at high MAT, check your MAT compensation table. set the correction to 100 (no correction) at low throttle angle.

[UrSobsessed]

What Marc said. On your MAT/TPS table, you have the correction set at 93 from 70°C=>100°C. That has it leaning out quite a bit.

[popdemonic]

Thanks Marc ,Dace.
I set the MAT/TPS Table on the lower right cells a bit leaning out since i noticed the a/f become richer once the MAT ramp up.
i think i got all sorts of issue.my friend tried to remap and play around the VE table and set the ign adv rate of change from 16 to 6/256rpm.the injectors pulsewidth seems more steady than before.my Deka's PW is 2.0ms. too low?I have 5bar FPR,max
injector DC is 93% on 29psi of Boost.I will need to get bigger one for E85 soon.

Anyway,i heard some slightly knock when WOT at the top end around 6-7K RPM on E85.Too much advance on the top end?
my lambda target is 0.80.

[UrSobsessed]

It becomes richer because you don't need as much fuel at higher MAT temps. BUT, to keep a steady idle you might have to run it a bit richer.

[EDIGREG]

Your entire timing map is very advanced. +6-10* higher than mine in almost every cell. I still highly doubt you got E85 to detonate at .80 lambda though.

Being 31-33* advanced at idle is probably also causing some of your idle issues. I'm around 20* there.

[UrSobsessed]

I'm around 20* there.

Do you have it that high because of the large injectors?

[EDIGREG]

No, that's pretty normal. 15-20* there on a stock AAN tune. If you use idle ignition advance that effects the actual advance at idle as well

[UrSobsessed]

Ah. I have 12° there, been working well.

[popdemonic]

Your entire timing map is very advanced. +6-10* higher than mine in almost every cell. I still highly doubt you got E85 to detonate at .80 lambda though.

Being 31-33* advanced at idle is probably also causing some of your idle issues. I'm around 20* there.

Ed,
i tried to give it more advance gradually from past and now we found the max advance on E85.I have some slightly detonation
on the top end let's say upper right of the table when WOT.i'm going to dial the ignition back at some point.
Cheers,
pop

[SEStone]

I try a very different idle strategy, modeled after what the later model cars do. I run a lot of isv duty cycle and keep the idle down using low ignition timing. My car typically idles between 2deg btdc to 5deg atdc. This greatly increases the 'reserve' power available and slows the responsiveness of the engine under idle control. A side effect is that the car now idles between 45-55kpa depending on loads, increasing pulsewidth and making it easier to tune in the linear portion of the injector. Pop may have trouble trying to do this though as his car is an auto and is already under a lot of load when in drive.


Sernt frrrerm Terrrperrterrrk

[ChrisAudi80]

I try a very different idle strategy, modeled after what the later model cars do. I run a lot of isv duty cycle and keep the idle down using low ignition timing. My car typically idles between 2deg btdc to 5deg atdc. This greatly increases the 'reserve' power available and slows the responsiveness of the engine under idle control. A side effect is that the car now idles between 45-55kpa depending on loads, increasing pulsewidth and making it easier to tune in the linear portion of the injector. Pop may have trouble trying to do this though as his car is an auto and is already under a lot of load when in drive.


Sernt frrrerm Terrrperrterrrk

Pop's car is not an automatic anymore. Not for a long time.
edit: I thought this article quite interesting
http://www.enginebuildermag.com/2012/01 ... ooth-idle/