Lets start a load value thread

[93Cobra#2771]

You still didn't answer my question. How would a lower load value give better performance or tuning than the higher value even if the higher vaule is correct? Regardless of whether you up the CID and lower the load, its all relative.

For one, you can better control both your timing and fuel under varying boost conditions. You basically have better control over everything. From what I recall, most power adder guys mess with the CID. To be honest with you, I don't know that much about what they do or don't, as I generally don't study too hard on mods that don't benefit n/a combos.

I do recall a post where Mike Glover said he was working on a way to log boost with the tweecer, and possibly a way to reference that boost with timing and fuel.

Sendero did some good searches there. My least fav. method is prob. the MAF method...

BTW, 94 up processors base even more stuff on load - in fact, almost all calc. are based on load. 94 up doesn't even have a WOT timing/rpm scaler...

[QWKSNKE]

See, I was thinking that the load datalogging I was seeing was the load of the engine (i.e. engine working harder to run)

[Wicked]

Originally Posted by coupe

I don't see engine load in the 200%-range as being useful at all. Any value should be maximum at 100%; maybe a hair over. Load is calculated from MAF, throttle position, and what else? Thought that was all. That is why the MAF transfer function is critical; especially for drivability. I don't see why the blower car would see more load: it's the same throttle with higher MAFlow. I would think that would be lower load. But not sure. Good discussion.

Simply put, load is how much air is flowing versus how much air should(theoretically) be at a specific RPM, TP, etc.

So, hypothetically speaking, if my N/A Cobra flows 487cfm(281*6000/2/(12^3)) at 6000rpm, that is 100% load.

If I supercharge it and now am pushing double the air, 975cfm, at the same 6000rpm, my load has increased to 200%.

Load % over 100% doesn't really mean you are 'overloading' the engine and definitely doesn't mean you are hurting power. You are just loading it past its normally aspirated airflow limit.

[QWKSNKE]

One thing to consider about load is, once you exceed 80% the EEC is subject to go open loop which is bad for economy if you are doing that while going down the road.

[Wicked]

Originally Posted by QWKSNKE

One thing to consider about load is, once you exceed 80% the EEC is subject to go open loop which is bad for economy if you are doing that while going down the road.

But unless you are making boost or running high throttle angles while cruising you should never be pushing 80% while cruising.

What was your MAF setup? Blow-thru or Draw thru? Just curious.

From my datalogs, I've got about 25-35% load while cruising at 2000rpm in 5th and around 13% at idle.

[QWKSNKE]

blow through.

My car idles at 25-30% load

[Wicked]

Originally Posted by QWKSNKE

blow through.

My car idles at 25-30% load

That might be a little high, what does brian's car idle at for comparison?

[Sendero]

Originally Posted by Wicked

That might be a little high, what does brian's car idle at for comparison?

Might idles between 16% to 21% dependant on which idle strategy its using.

[Wicked]

Originally Posted by Sendero

Might idles between 16% to 21% dependant on which idle strategy its using.

What RPM does your car idle at? I figure mine and yours should idle at about the same load. Mine does idle a little rough and maybe low.

[Sendero]

Originally Posted by Wicked

What RPM does your car idle at? I figure mine and yours should idle at about the same load. Mine does idle a little rough and maybe low.

It tried to idle around 650rpm but I have it set to idle around 710rpm.