Measured BLM/128 = XX%

XX% * Table value = New BLM


And for the measured BLM, utilizing winaldl, I would use the BLM chart for narrow avg (also checking the std dev of the data). Is this also correct?

 

i have used wide average. but i take me about 5 logs to get it close to 128 after a change in engine specs that disturbs the VE. so if i used narrow it may not make too much difference. there is also a second VE table that needs to be adjusted assuming you have not modified it to use only VE1 table.

 

It depends on the code. With the TBI ecm's you would have to combine the tables in a program like explorer, then use that correction factor, THEN subtract out your VE2 adder table and see where that leaves you with the VE1 table.
With the newer code like the $8D, your formula works fine. Some people like to include the INT by weighing it, it really doesn't matter much and for getting close the BLM works great.
Ronny, I hope you haven't disabled the VE2, that wouldn't be good for your engine unless you've got the rev limiter set at 3200rpm.

 

gosh no. i have the WB to keep a close eye on things.

i have not had car for 30 days. so tuning on hold. in shop getting paint.

price is right if i can be patient.

 

Did you mean excel?

So you are saying that I need to take in account that 1 column VE Adder table and subtract that to the Main VE values at that particular RPM, and it will give me a number smaller than 100 so I need to add BLMs to get to 100?

 

Yeah, I ment Excel. There are 2 VE tables. One is 3D and the other is an adder based on just RPM. The adder goes up to 6400rpm where as the 3D main table only goes up to 3200. From 3200 and up the last line of the main table is used till 6400. This way, like any normal air pump, the volumetric efficiency can be decreased above peak torque. At 6000rpm it's hard to move a lot of air through the relatively small intake and exhaust ports, hence the decrease in VE.
Do you know how to combine the VE tables? If not, everything I've said would mean nothing.
Basically what I'm trying to say is you can't come up with a correction factor and apply it JUST to the main VE table. The VE2 table is also used so you would need to add first before multiply... basic math.

 

I do understand the concept of both tables and adding them.

I have been doing to the tuning below 3200 strictly using VE1. If a whole rpm range is rich, I would then tweak the VE2 at that RPM. Above 3200 I changed the values basically bumping up my fuel curve because my I have a better flowing engine with more CI. I did what the factory did, but raised it about a 1000 RPM later in the VE2 table.

I am still testing out the higher RPMs and WOT tuning. So far the low RPM VE1 tuning is going great and I am slowly getting towards 128 (my target is 125 though). After that biz I got to get myself to the dragstrip and tune my WOT and SA.