AEM wideband

[THEKILLERWHALE]

How do I know
If it's wideband?

It's reading about 15 on idle and 18 on just cruise

That is way wrong.

What are good ranges and how do I get them there?

 

[GsxMan98]

14.7 at cruise and at idle. 11.2 at wot to get them there you need something to tune fuel with like dsmlink or safc or even maft.

 

[THEKILLERWHALE]

Okay killer I getting link this week

 

[THEKILLERWHALE]

I have never seen somebody elses gauge but is it suppose to move. Like mine never stays steady on one number. Like at idle at 15 its actually jumping around 14.7 to 15.2 are they suppose to jump that much?

 

[scott90gsx420]

I have never seen somebody elses gauge but is it suppose to move. Like mine never stays steady on one number. Like at idle at 15 its actually jumping around 14.7 to 15.2 are they suppose to jump that much?

Lol ya thats completely normal bro.. its suppose to do that during low throttle..
Thats the ecu shooting for 14.7(stoich) in closed loop.. It sweeps back and forth between lean and rich looking for that afr dont trip.. Its when it stops doing that id be worried .. And 11.2 is a good afr... You should see a steady AFR then..

 

[hypergenesis]

Lol ya thats completely normal bro.. its suppose to do that during low throttle..
Thats the ecu shooting for 14.7(stoich) in closed loop.. It sweeps back and forth between lean and rich looking for that afr dont trip.. Its when it stops doing that id be worried .. And 11.2 is a good afr... You should see a steady AFR then..

Mind giving some advice?

Mine hits 14.7 on start up but after a little bit of revs it sits at 16.7+ this only started happening after I installed the wideband and dsmlink v3

 

[scott90gsx420]

Mind giving some advice?

Mine hits 14.7 on start up but after a little bit of revs it sits at 16.7+ this only started happening after I installed the wideband and dsmlink v3

Well if its leaning out as the rev comes down thats ok.. If its leaning out as the RPM's climb then you need to tune it so it runs richer..
Just slowly add fuel until its floating somewhere between 13.8-15.5 AFR.. And you probably wouldn't have known the AFR if you didn't have one in it before so I wouldn't trip.. If its during the revs just tune it out if its after then its ok..

 

[THEKILLERWHALE]

So at 18 it's lean or rich? I always thought that was rich. 18 fuel : 1 air. Wouldn't that be the ratio? In which case it would be rich? If that's lean then I'm assuming I should up my fuel pressure until it goes down a little ?

 

[jimbob_843]

Got it backwards my friend 18 air : 1 fuel. That is lean which is bad. Your gauge should so say a/f ratio on there somewhere mine does.

 

[scott90gsx420]

Got it backwards my friend 18 air : 1 fuel. That is lean which is bad. Your gauge should so say a/f ratio on there somewhere mine does.

This.......
What are you using to tune with?? If you only have a AFPR then yes thats a start.. But you said you have link so you shouldn't need to up the fuel pressure it should just need a tune through your dsmlink..

 

[Diehardmitsu]

18 on the AFRs is way too lean even at cruise. Usually, when you go over 16.0 on cruise
on most cars especially boosted ones, they miss fire and you could hear pops in the exhaust. If you have a leak in the exhaust system(manifold, turbo, downpipe) before the wideband's o2 sensor that could be the cuase of the readings you're getting.

 

[THEKILLERWHALE]

Okay that explains why I have been hearing the pops. And okay I was way backwards on the ratio . And no I'm getting link this week and I will install it next week. Should I up the fuel pressure in the mean time? Would that help mellow it out? It's at 43psi right now

 

[scott90gsx420]

Okay that explains why I have been hearing the pops. And okay I was way backwards on the ratio . And no I'm getting link this week and I will install it next week. Should I up the fuel pressure in the mean time? Would that help mellow it out? It's at 43psi right now

Ya go ahead and up it.. But don't go over 53 or so anything over 10psi above what the injectors were designed for will wear them out faster..
And keep it out of boost until you can get some other sort of tuning devise installed..

 

[THEKILLERWHALE]

Okay it's at 52. That seemed to help a little during cruise. So I can't boost it? I have been dying
To boost it since the motor was built. I have 800 miles and haven't been able to open it up yet. Damnit :-/

 

[LiquidX]

Sounds like an exahust leak.

You haven't boosted yet?

I was rocking 25 psi after 50 miles. Holding up STRONG! It does help boosting to seat the rings and helps seat them to what the motor will actually be doing.

 

[EvoChris]

I wouldnt boost it. Just getting the motor built and then blowing it up wouldnt be a thing on my to do list haha. Just wait till you get link so you can tune the air/fuels.

 

[LiquidX]

I wouldnt boost it. Just getting the motor built and then blowing it up wouldnt be a thing on my to do list haha. Just wait till you get link so you can tune the air/fuels.

How would you blow it up? Any problems with bearings will present themselves within the first few miles. The rings fully seat in less than 100 miles.

You can choose to do it either way, one will give more power than the other due to having higher compression and less blow-by.

 

[THEKILLERWHALE]

My aem wideband is reading about 15 at idle and goes up from there. I have 800 miles on the motor and am very eager to really open it up. My boost maxes around 14 pounds and my fuel pressure is about 52 psi. Would it be a bad idea to push and open it up or should I wait til next week when I'll be installing link?

 

[gotrnet]

15 at idle is ok, but if you are in boost it should be down near 11.5. if it is going up (from 15 as you said in your post) do not get on it. you need to get it tuned. if it is tuned you have a problem.

 

[LiquidX]

I must have missed this part. If you are on stock injectors and do not have a fuel tuning device, put your fuel pressure back to 43psi. Your ECU expects your injectors to flow at 43psi not 52psi. You are injecting too much fuel doing that.

If you have to up your fuel pressure to get your wideband reading right then you have an exhaust leak pre sensor that you need to find and fix. That's another reason why I prefer to run the wideband in the front o2 sensor location and utilize narrow band simulation.

Fix your issue, don't cause more.

 

[THEKILLERWHALE]

No it's not tuned. Factory ecu settings. I will boost a little and see where it goes from there. If it gets worst under boost I'll take it easy til it's tuned

 

[brevlle]

like gotrnet said, if it goes up from 15 while boosting, DO NOT get on it.

 

[DOHCTA]

Would it be a bad idea to push and open it up or should I wait til next week when I'll be installing link?

I think you answered your own question right here. And like these boys said - 15 and up, don't touch it till you link.

 

[LiquidX]

So why did you make a new thread when you have this discussed in your current thread dealing with the problem?

As I also stated in your other thread, turn your fuel pressure back down to 43 psi. I don't know what idea you had thinking that would be fine.

The stock ECU expects x amount of fuel from the stock injectors set at 43 psi (for 2g. Changing that changes your global fuel trim making you run rich at all times.

You have an exhaust leak allowing air to get in yiur exhaust causing your wideband to read lean. This was discussed in your other thread as well.

Fix your issue and stop causing more messing with stuff you have no idea about.

 

[THEKILLERWHALE]

Ya go ahead and up it.. But don't go over 53 or so anything over 10psi above what the injectors were designed for will wear them out faster..
And keep it out of boost until you can get some other sort of tuning devise installed..

That's why I upd it.

And I started a new thread cause I wanted answers more focused on this specific topic, not a couple opinions at the end of another, as clearly determined between these 2 threads, everyone has there own opinion apparently on the correct way to do things which makes it damn hard for a newbie to learn something about what's best for his car.

You say 25 psi boost at 50 miles, other guy says blow it up.

He says 10 psi extra on stock injectors is fine.

You say it's causing more problems.

I just want my engine to last and run at optimum efficiency