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RB20DET Pinging Issue @ Lighter Throttle

yogi000

By yogi000,
in Engines & Forced Induction

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Cubes Grand Master

Cubes

Posted
Posted (edited)

Chris,

How was the O2's response (0.2-0.8v cycle speed) affected with the change ON IDLE? If the lag time is out the closed loop function finds it hard to cycle quickly.

Edited by Cubes
Chris32 Veteran

Chris32

Posted
Posted (edited)

Didn't check that as yet mate, will have a look tonight

Economy has been quite poor for a while now, hope its a bit better now

Edited by Chris32
yogi000 Mentor

yogi000

Posted
  • Author
Posted

i've been running my car with closed loop disable for about a month now and i'm getting 300-350km per tank with city driving only. I find when i enable closed loop my idle becomes jumpy. Possibly stuffed o2 sensor

Chris32 Veteran

Chris32

Posted
Posted
Chris,

How was the O2's response (0.2-0.8v cycle speed) affected with the change ON IDLE? If the lag time is out the closed loop function finds it hard to cycle quickly.

Checked this on the way to work today, response was very quick

Never checked it before though

Economy seems to be a bit better too

  • 1 month later...
Chris32 Veteran

Chris32

Posted
Posted (edited)

Mine is still giving me the shits

Playing around with injector correction % on each injector now. Last night I went through each injector and added 2% more fuel to see if it would help with my random knock

Injector 4 showed the most improvement, knock going from 80 to 24 at 1.3bar

so now my injector correction reads

1 59.5%

2 58.5%

3 58.5%

4 60.5%

5 59.0%

6 59.5%

Maybe I am finally onto what my problem is?

Worst knock I saw on the way to work this morning was 33. It used to be up in the 70's

Running SAFF 98 with 10% ethanol. The fuel itself showed normal knock numbers compared to BP98 before I did the adjustments

Edited by Chris32
Chris32 Veteran

Chris32

Posted
Posted

The car feels and sounds allot better. Maybe its just me, but the exhaust sounds crisper than before

The injectors were cleaned and tested a year ago, and where all within 1% of eachother. There was one which was a bit clogged, but it all was ok

Will see how it goes in the next few days

Cubes Grand Master

Cubes

Posted
Posted (edited)

If only we could tell which knock sensor reads what. :P

Chris, If it is indeed pinging slightly and has been for some time then those little rb20's are tough little nuggets to crack.

Edited by Cubes
Cubes Grand Master

Cubes

Posted
Posted (edited)

I've done that mod.. it doesn't appear to make any difference to how the bov opens or when it opens.

I did find drivability to suffer a little when cruising around the hills. Made the car jerk around more when you jump off and on part throttle. Depending it may also increase the chances surge.

So.. I removed the grub.

Edited by Cubes
Chris32 Veteran

Chris32

Posted
Posted
If only we could tell which knock sensor reads what. :)

Chris, If it is indeed pinging slightly and has been for some time then those little rb20's are tough little nuggets to crack.

Yeah, I think it probably is detonation, how much is hard to gather

Been like that for over a year now, close to 18,000kms!

Will keep going in the process of elimination to see what differance more of a play with the injectors does

BOV mod works well on mine, does make on off throttle driving a little harder to keep smooth

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