Hey guys

So I'm on my second read of the UTEC manual. And I have surfed on this question but could not find anything.

For all questions please assume that Open Fuelling is DISABLED (ie. using only MAF pulldown).

The manual does not specifically define "load". I understand the concept.. the car is under "load" during heavy accel (nutshell).

But what does it mean quantitatively as used in the UTEC's tuning tables? What is the actual definition of "Load" in this context? How is it measured?

And in terms of how Load is measured, what would be an example? For example how do you relate 60% Load to be twice as much as 30% Load?

And how does "Load" differentiate from TPS? And more specifically, how does "Load" differentiate from TPS across RPMs?

I realize that the TPS threshold % determines when the UTEC moves from 0% Load to the 10-100% columns. And I see how you tune across rpms...

Could "Load" translate as the 90% of throttle travel remaining after the TPS threshold % is crossed? Then each 10% of the remaining throttle travel after the TPS threshold is crossed corresponds to the "Load" produced at the different Load columns in the UTEC tuning Map?

That seems hokey and I'm sure there is a more valid definition. Anyone?

Thanks!
-Smoky

 

Let me see if i understand what your asking.

From what i understand TPS (Throttle Position Sensor) You need to make sure that reads 0 when the car is sitting there idleing. Once that is set and you step on the gas you move into the different load columns depending on how far down you push the pedal. So floored your in load column 100.

Hope this helps

Later
Aceman

 

Then it sounds like I'm understanding "Load" properly, if "% Load" corresponds to "% travel used on the gas pedal."

Thx Ace!

 

Wait.. I think I figured it out.

"Load" is the % load on the MAF from 0 - 5.0v. That's it isn't it?

That makes more sense, because then "Load" is a completely different variable than "TPS %". Cuz I was starting to wonder what it meant if you tuned "Load" sites that were below your TPS threshold. So the previous theory began to break down.

So I think Pg 38 #4 of the manual is what defines this. I just didn't get it the first couple times I read that passage. My brain needed it to be worded differently.

Same reason a Dan Brown or Tom Clancy book takes me 2 months to finish. lol

So then wouldn't it make sense for someone to offer a MAF voltage gauge to aid tuning? It would certainly help to determine the best weightings across load sites for different driving "styles" (economy vs performance etc)

 

The load figure is more likely calculated using throttle position vs. manifold pressure.

 

To quote the manual:

"When using MAF mode fuel tuning, the load reference for columns 10%-100% is MAF voltage. The UTEC default MAF range is from 0 volts to 5 volts."

so yes, smoky tires is correct.

 

That makes sense now that i think about it. Its been a while since i messed with my UTEC now that it is tuned.

Later
Aceman

 

I am almost positive that you can get the MAF voltage values from the logs. I use a MAP sensor so I never really paid much attention to the MAF voltage but I vaguely recall a column for it in the logs.