o2 sensor + low throttle/revs pick up.

RockyIII

Supercharged
Joined
Apr 16, 2012
Messages
224
Location
Brazil
No doubt this has been asked before, but it might be of use to some.

I have a small issue with very small throttle openings for revs pick up.

I have all the stock air filter plumbing, stock filter, custom full '3-1 short exhaust system' and custom map 20050TORS_Dyno.

*I disabled the O2 sensor before downloading the map as it was defective, so don't know if this has something to do with it*

As I've said before it starts, idles and runs like a dream 'BUT' there is the very small issue at small openings. It's a bit hesitant on the initial pick up and occasionally jerks in 1st and 2nd when going slow.

Is there any tried and tested way of improving/eliminating this?

Cheers chaps!! Always appreciated.
 

Just my thoughts..

I am sure the OE closed loop 02 sensor controls the AFR at idle. You seem to be saying your 02 sensor is defective, so I would think it needs replacing as it could possibly be at the point your problem shows up..
 
Hi Dennsell, when I unchecked the O2 box in Tuneecu before download, I also removed the sensor and plugged up the hole.

Would a new O2 sensor necessarily correct this or could some adjustments be made in the tables somewhere?

Thanks.

P.S It's just that I'd rather not buy an O2 sensor and continue using the bung that is currently in there.
 
RockyIII said:
Hi Dennsell, when I unchecked the O2 box in Tuneecu before download, I also removed the sensor and plugged up the hole.

Would a new O2 sensor necessarily correct this or could some adjustments be made in the tables somewhere?

Thanks.
Click to expand...

I think I am correct, the 02 sensor is part of the ECU engine management system and the system looks for it and checks it in, so if its not there (disconnected) it will be a ECU checksum error or fault, you need a Dynojet 02 sensor eliminator to plug into the empty socket to fool the ECU into believing it is there for normal ECU operation..

I think I am correct but someone else may have more info on the Tuneboy..
 
Just a thought, and I may be wrong. I have a Dobeck on mine and didn't need to do anything re O2 sensor. I can't quite recall the explanation I was given but I think the Dobeck bypasses the O2 sensor. Flip could clarify I'm sure. Maybe, but please check, that's an option for you and would mean you could make further engine mods down the track (intake etc) without needing complicated remapping or dynotuning.
 

Dennsel if you tell the ecu Via tune boy there is no O2 sensor you can unplug it and remove it. or leave it plugged in as a cork instead of buying a bung plug. It will not throw a error in the ecu because all power to it has been shut off. The ecu is not sending any signals to it then.
 

Thank you Sir.. I thought it was similar to the PCv and you needed an eliminator, so my appoligies if I was misleading on the Tuneboy info.
 
I've been doing some reading about making the L tables fatter down low, have you chaps any knowledge about this. I previously used the 20050decel tune which had numbers in the 0 rpm L tables to try to cure popping but it didn't make any difference with my exhaust.

Maybe there is something which can be done here to improve the pick up and reduce that slight hesitation that I'm currently experiencing right off idle. Of course, I could be completely wrong.
 
I have always wondered why on some tunes in the " L tables" why there was numbers in the " 0 " air pressure on some tunes and not at all on others.

In the tunes I've seen it would have "610" instead of the "0". ???

However in the tune I'm running now has "610" in there and it still has a decel pop..... not really bad as it once was with different tunes but its still there.
 
Was just thinking, what would actually improve small openings TP with the O2 sensor disabled in tuneecu and removed from bike as in my case?

Is it simply a case of fattening the low down L tables or is it more complicated than that? It just feels like my bike needs a touch of something at very small openings to help pick up.

It's a mine field.
 
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