V4 Load Table psi values
 

I've been reading the V4 Manual quite a bit, still deciding whether to upgrade my V3.1 to a V4, or go Haltech.

One thing I like about the Wolf is that the load bands are scalable, depending on what your max boost is. But the thing I can't figure out is what PSI each load band represents. 107 is 23 psi, 100 is 20 psi.

So am I safe to assume that each load band represents 3 psi and that 0psi is 50% load?

That would be a lot of Vacuum bands..my v3.1 only had 2 in 21 psi mode!!!!

0psi is actually 43 =]

Ok, thanks :)

So lets say you scale your 100% load band to be 15 psi. 43% still remains 0 psi, and you would could increase your tuning resolution under boost?

i dont know if 43 still stays at 0... i havent scaled it

if i recall 86 is about 15 psi if you use the default scale

If you are trying to match the load bands to your boost gauge, it's never going to work out correctly because the boost gauge is psig and the load bands are based on psia.

I think you are reading too much into this. ;)

... i go by what the wolf says
it does have min/max datalog, i see where it is at what boost level by that.. and its easy to tell 0psi, just dont run the car

They should just have the load axis as kpa.
it would make it much easier for all, at least that's what i'm used to.

that'd be great but its setup to be programmed for any kind of external sensor.... wouldn't exactly work that way....

Its possible as many other ecu's already do this...

yeah i suppose it could. wouldnt be that hard.. i think they just did that with their old ecus and kept it.. ah well it doesnt really matter once you know whats what

Yeah that's why my Wolf V3.1 always read 2 psi more than everything else? Never liked that too much.

EA, do you know if the 107% band always stays at 23.5 psi, no matter what you scale the other bands too?

The Wolf EMS can use MAP, MAF, or TPS to determine load. While kpa may work great for MAP, I think that kpa would be a rather strange value for MAF or TPS. ;)

Also, some EMS products display vacuum and boost load values based on a fixed static value in order to aid their target consumers. Sometimes I wonder if these incorrect values hurt more than they help.

The way I understand it, the 100% point is the one that you set in the Wolf, and the rest of the points (including the 107% point) are calculated from that value. Therefore, 107% = "23psi" only when you set "20psi" boost as the 100% value.

Any MAP-based EMS would need an additional static pressure sensor in order to properly compute boost pressure. Also, your boost gauge and/or MAP sensor could be off.

The V4 Wolf software has a calibration function for its on-screen boost/vacuum gauge so you can set it to your boost gauge if you like.

I dont think the load band settings are difficult at all,whilst you are tuning , if there is a certain point you want to capture,just npress the little S icon with the line through it and it will stop at that point...The load bands are also there as for what evil wrote about using a MAF or TPS. If this was such a bad idea,i dont think the trust E-Manage or the Haltech interceptor would be utilising the same idea...

Mine is off by 2 psi too (Wolf Version 3.1). That always annoyed me. If what you say is true then wouldn't the difference be ~14.3psi (the difference between static & guage pressure, dependant on where you live).

IF 107 is 23 psi what is 0? what is it in vacume? I only ask beause I want to set up my Innovate LMA-3 kit to log in the same format for less headaces

-Jacob

0 psi (atmospheric pressure) is usally the Load% that the Wolf HC displays when you turn on the car....on NYT's car 0 psi is 43% Load for example

think of it as percentages of a maximum that you set. If you set your maxium to 20 psi (which is what i would recommend for any boost application, so no recalibration is needed if you decide to raise the boost) then 100% = 20 and 0 = infinate vaccum. ~43 ends up being atmosphereric, and if you do the math... 100 - 43 = 57 percentages that operate in boost. if you divide that in half, and add it to atmospheric (43 ) then you'll get 10 psi. 57 / 2 = 28.5 , 43 + 28.5 = 71.5

so 71.5 would equal 10psi

85.75 would equal 15 psi

57.25 would equal 5 psi

if you set the maxium to 15 psi, then all of this changes because 100% now is 15 psi, but 0 is still infinate vaccum.

for n/a models you set the maximum to 0psi because you don't ever plan on making boost. you will have 16 different load bands from infinate vaccum to atmopheric.

i think 40 might actually be atmosphere.

Why not take an air pressure regulator supplied with shop air (from a compressor)
tied in to a gauge,and plug it in to the map. Dial in your pressure and check it thru
wolf interface. this is how i calibrated the gauge, and maped psi to load points!!!

Upgrade to a 4.0, the 3.1 just doesnt have the control you need to make the car run well in all respects (not enough resolution). You can get a discount if you upgrade to 4.0, and you can pretty much keep most of your 3.1 harness if you like ....

I did this and came up with the attached chart.