Ok, here is my issue. I am trying to understand why when i adjusted my lower VE tables (below 3k rpm) why it effects the higher rpms too? I left everything over 3k rpms alone,but does the effect of leaning the lower tables out still effect the whole rpm band? The numbers have been adjusted by about 10. For example at 1200 rpm at 30kpa the stock number was like 50.02 and now its 40.02. SO, my question is should i just adjust the tables below like 2k rpms instead? I dont want the upper rpms effected at WOT. I just want to lean the car out during part throttle and driving in traffic ,but i want it to richen back up under WOT. What is the problem ?

 

A BLM value of 128 or higher is used during PE mode. A BLM value less then 128 is ignored during PE mode.

Seems you already have a thread on this topic...

RBob.

 

i thought the idea was to have BLMs at 128 under normal driving conditions,not PE cause its ignored anyway. So, can u help me or not?

 

SO CAN ANYONE HELP ME WITH FIGURING OUT BLM'S? NO ONE KNOWS? AND NO I DO NOT WANT TO REFER TO STICKIES EITHER.

 

my blm's are in the 130-145 range at part throttle (non-PE mode) car seems slower with higher blms

 

BLMs will change based upon air temps, baro pressure, humidity, and the mechanicals of engine. we try to get then close to 128. 124-132 is good. This AM here in WI the air temps were 32dF. I would expect BLM to rise considerably. If NB02 monitoring system is working you will not be lean nor rich but at stoich. A 140 BLM is not lean as far as A/F it is just adding fuel to arrive at stoich.

 

my fuel pressure is at 43.5psi, inj constant is correct also. I found that my car runs better with the aujp bin vs the saujp bin too. I suspect this is due to the saujp having air disabled. As far as blm's, i still find that having them higher than 128 slows my car down. Reason for wanting to tune them in the first place was due to excessive fuel consumption,but the car is faster that way.

 

Not really sure what your talking about, I have never run into this problem, where the lower VE table effects my upper table, then again I never just tune my lower tables without doing the upper one right after.

As stated in other posts the VE cells are interpolated, one thing that I always do when adjusting VE tables is MAKE SURE you have no mechanical problem be for doing anything, check all sensor, wire, plugs, cap, rotor, air filter, injectors, tps, IAC, IAT, pressure regulator, vacuum leak, exhaust leak, I'm MEAN everything. I cant stress how important this is, I once helped a friend tune his car and to no end I just couldn't get the BLM's right, finally I brought the car to work and put a smoke machine on it and found a small crack in the header upstream of the O2, anyways you get the piont.

Now once I know or at least think I'm 99% sure there are no underlying problems I move to fixing everything in the tune first before doing my VE tables, like proportional gains, IAC table, SA tables, O2 constants, injector constants, stoich constant, injector PW vs batt volts, basically verything and anything that needs to be changed.

So VE tuning for me has really become very easy for me now that TPv5 has a histogram built in. What I do is make a two BLM histograms, one for lower VE table and one for uper table.

The next thing is to determine how off are my VE tables, what king of mod's have I done, for me the stock bin would not even be close since just about everthing in the engine was chaned all at once, like cam, head, intake, headers, injectors. If you haven't gone that far then you may just be able to load your stock bin and do some datalogs.

I start at idle and get it as close to perfect as possible, then I disable PE and go for a short drive and take a datalog, small throttle changes here. I then run the datalog in the lower VE histogram, then copy and paste into an excel I made using TRAXTON's VE formula of BLM/128 then multiply that value to your VE cell to get the new VE for that cell, then just copy and paste the new VE table in TPv5, I do this about three times then move to the upper VE tables, I then match the last line of the lower VE tables to match the first line of the upper VE tables.

The thing is you have to do this kind of quick in one day so that climate changes dont effect your tune as much. Also one other thing to note is that I dont just keep using the histogram to fix VE, once your very close, if I need to go back and make small changes I just look at the cells in the(new datalog) histogram with the most counts and adjust individuale cells, then just use the smooth feature in TP.

Once this is done the VE should be very close tp prefect, then I adjust the BLM cells to my driving style.

I have to say that this process has worked great for me and that my car runs very close to 128 blm (+- 2-3) in almost all weather conditions.