Is it O.k. to have over 100% VE?

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Rally Smith
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Is it O.k. to have over 100% VE?

Post by Rally Smith »

I have been adjusting my BLM values to bring them to the 128. If I get a 144 in an area then multiply the value that is currently in that cell (lets say it's 89.5) by 1.13 it gives me 101.14 to plug into that cell to make up the difference. Is this o.k. or am I doing something wrong?

Thanks,

R.S.
robertisaar
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Post by robertisaar »

the 101.14 will get truncated to 99.66 or 100%(depending on how the XDF was written), so either the engine is breathing VERY well, or there are other things that need to be played with to get the VE in line.
Rally Smith
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Post by Rally Smith »

Well seeings how this is a bone stock tbi 350, I don't think it's breathing THAT well. What should I look for as far as things potentially being wrong? Or what else could I "play" with to get it into line?

Thanks,

R.S.
robertisaar
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Post by robertisaar »

seems like the injectors are not flowing as well as they should if you need to bump up VE that far to get it to run correctly... so either look into some way of verifying they are good, or go the ghetto method and turn down your BPC.
Rally Smith
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Post by Rally Smith »

My air fuel ratio is at 11-12:1 so I would think that it's getting plenty of fuel... but I'm still pretty new at this so I could be all wet. I guess I could send the injectors into Turbo City and get flow matched ones for free.
What do you think?

Thanks,

R.S.
robertisaar
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Post by robertisaar »

if you can get flow matched injectors for free, why not? :lol:

if everything else is correct, then maybe the O2 is bad? i'm guessing the 11-12:1 is from a WB? i've never experienced it myself, but have heard stories of a WB simulating a NB and the ECM didn't like it...
Rally Smith
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Post by Rally Smith »

Yes, it is a W.B. O2. I guess I'll ship the injectors in and see where that puts me. Any other ideas would be appreciated.

Thanks again,

R.S.
:wink:
Rally Smith
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Post by Rally Smith »

I don't have a BPC Field. Would it be called anything else?

*Found it under Constants: Injector Flow Rates.
robertisaar
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Post by robertisaar »

may be refered to as BPW vs desired EGR% or something similar depending who wrote it.
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honken
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Post by honken »

Its the injector flow rate.
If its bone stock its not the way to do it(somthing is wrong).

If you look at your bin it has parameters that involves egr more spark and less fuel( up to 10% off fuel reduction and 3 deg more spark on my bin)
fuel eco..
You need to turn off the egr to get blm at 128.

Look at your pameters and try to learn howe it works is the best way to do it.
turbodave
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Re: Is it O.k. to have over 100% VE?

Post by turbodave »

Rally Smith wrote:I have been adjusting my BLM values to bring them to the 128. If I get a 144 in an area then multiply the value that is currently in that cell (lets say it's 89.5) by 1.13 it gives me 101.14 to plug into that cell to make up the difference. Is this o.k. or am I doing something wrong?

Thanks,

R.S.
More often than not, high blm's are sometimes indicative of a vacuum leak. Might want to look into that also.
robertisaar
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Post by robertisaar »

high BLMs due to a vacuum leak only apply to a MAF car(since it wouldn't be able to detect the extra air being sucked in)... the MAP sensor measures manifold vacuum, and a vacuum leak would just cause less vacuum and in turn, deliver more fuel(assuming in your VE table less vacuum(higher kPa) has a higher VE(which it should).
Rally Smith
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Post by Rally Smith »

I changed all the EGR Fuel Reduction vs. RPM vs. Vacuum to zero's. I didn't see a change at all. Is that the EGR field you were referring to?
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honken
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Post by honken »

Its the constant = MPH to Enable EGR (set it to 255 to disabler egr).


EGR Fuel Reduction vs. RPM vs. Vacuum (only for fuel).
Rally Smith
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Post by Rally Smith »

I don't have that. Could it be called anything else?
robertisaar
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Post by robertisaar »

what mask and if possible, which XDF?
Rally Smith
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Post by Rally Smith »

$0D Mask, and Advanced $0D v175.xdf
Thanks,

R.S.
robertisaar
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Post by robertisaar »

seems 0D is a bit different than what i'm used to... it has fueling setup like a MAF mask: uses a cylinder volume and injector flowrate constant. if you're sure those are correct, then you will either have to fudge numbers or find something wrong mechanically/electrically.
Rally Smith
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Post by Rally Smith »

That sure is not what I wanted to hear. But thank you for the help, I appreciate it.

R.S.
Rally Smith
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Post by Rally Smith »

Is there a way to test my MAP sensor and EGR? I don't want to trouble shoot by throwing money at it if I don't have to.
If they test or I change them out, what fields can I look at "fudging"?
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honken
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Post by honken »

If it is the Advanced $0D v175.xdf from moates net.

To disable EGR its the =Minimum Speed for EGR (set it to 255 mph).

Were do you have the wideband lamda nere the cars lamda.

Exhaust leak???
I dont think your map is bad.
If the egr have an airleak you have bad idle.?
WB 11-12 afr at throttel ?
BLM at 144 what afr on wb at same map and rpm?

I belive it more the settings in the prom.
Rally Smith
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Post by Rally Smith »

I'll check that stuff tonight and let you know.
Thanks a bunch for the info.

R.S.
Rally Smith
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Post by Rally Smith »

Well I changed the EGR to the 255. I data logged on my way home tonight and don't see a difference in the BLM Cells at all. The wideband O2 is set for 14.7:1. I don't have an exhaust leak to the best of my knowledge. I don't have a bad idle either. The W/B afr at throttle question I don't understand...
When I play back my data log it doesn't show my W/B O2 readings for some reason. Any idea on that too?
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honken
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Post by honken »

You wrote:
My air fuel ratio is at 11-12:1 so I would think that it's getting plenty of fuel

My (somthing is wrong) was bad ,mented you need to check if everything is ok.

You disable everything that can mess with your tunning.

Lower the = Injector Flow Rate (TBI gms/sec) .
Rally Smith
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Post by Rally Smith »

[quote="honken"]If it is the Advanced $0D v175.xdf from moates net.

To disable EGR its the =Minimum Speed for EGR (set it to 255 mph).
(Did that)

Exhaust leak???
(How would a exhaust leak cause problems? I would like to understand. My truck still has factory exhaust manifolds and Y pipe so I would guess that it does have some sort of leak where they connect.)

WB 11-12 afr at throttel ?
( Any position) Another question is the A/F Ratio supposed to be constantly moving around?

BLM at 144 what afr on wb at same map and rpm?
(Checking on this)
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honken
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Post by honken »

Exhaust leak???
(How would a exhaust leak cause problems? I would like to understand. My truck still has factory exhaust manifolds and Y pipe so I would guess that it does have some sort of leak where they connect.)

A leak nere or before lamnda can draw in air and its lying to the ecm.


Where do you have WB lamnda close to cars nb lamnda?
Rally Smith
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Post by Rally Smith »

Replaced NB with WB before the Cat location. I have the innovative LC-1 that tells the ecm the NB signal and the WB to my laptop. Thanks for helping me understand the purpose of the question.
Rally Smith
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Post by Rally Smith »

With the help of another I adjusted my Cylinder Volume to allow for the corrections that I needed to make. I added 25% and that seemed to be the ticket.

Thanks,

R.S.
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