Put your thinking caps on..

[QWKSNKE]

I want to tune my car for a little better fuel economy. Richard, Nathan, or Brian, what variables needs to be changed? Do you think it would help if the load variables were brought back down or adjusted to put the car back on a 0%-100% scale?

Eric, what does your book say about it?

[Italian LX]

I want to tune my car for a little better fuel economy. Richard, Nathan, or Brian, what variables needs to be changed?
Bigger pulley? :shrug:



:D

[svopaul]

Lighter foot? :shrug:

:D

[Wicked]

NM, my name wasn't listed. :jester:

[EZ SPEED]

Eric, what does your book say about it?

It says move closer to work so you dont have to drive so far :rofl:

J/K , I will read into it later, but I dont remember anything specific right now, but fuel economy has never really meant much to me, so I could have passed rightt over that info.

[Wall96cobra]

Lighter foot? :shrug:

:D



:werd:

[Wicked]

:werd:

nm

[99LS1]

drive the focus! :jester: How much extra mpg can you really expect by tuning it for that, a couple?

[Sendero]

Guess I'll give the first legit answer:

What does your fuel tables look like as far as commanded mixture in low loads? I'm sure it ramps up to a 11.5:1 or something far richer than a 14.6:1 mixture. With your load scales off you are getting into a rich state far sooner than you need to be. I'd suggest looking at your normal cruise load vs. performance load and modifying the fuel tables accordingly.

[QWKSNKE]

I'll put it this way, interstate crusing average 15 mpg last year. So far I have around 260- 270 miles on the car (in town driving) and I have used up almost 2 tanks of gas!

[Sendero]

I'll put it this way, interstate crusing average 15 mpg last year. So far I have around 260- 270 miles on the car (in town driving) and I have used up almost 2 tanks of gas!

:saywha: Thats what, 8mpg? (I don't remember Fox body tank volume)

[TheJeanyus]

I'll put it this way, interstate crusing average 15 mpg last year. So far I have around 260- 270 miles on the car (in town driving) and I have used up almost 2 tanks of gas!
:ohsnap: I shall never complain about my gas mileage again...


...until I forget I said that in this thread. :jester:

[banditmwp]

:saywha: Thats what, 8mpg? (I don't remember Fox body tank volume)
Same as yours...15.4 gallons. :nice:

[Italian LX]

NM, my name wasn't listed. :jester:
nm

[Wicked]

nm

:321:

[Doug904]

Guess I'll give the first legit answer:

What does your fuel tables look like as far as commanded mixture in low loads? I'm sure it ramps up to a 11.5:1 or something far richer than a 14.6:1 mixture. With your load scales off you are getting into a rich state far sooner than you need to be. I'd suggest looking at your normal cruise load vs. performance load and modifying the fuel tables accordingly.

I'm sorry but I must be missing something here? WHy are your load values off? Wait, dont tell me Pro-M? ahahha. Anyway, the closer you can get to 14.6 at lower cruising loads the better even supercharged. With my Whipple I stay around 14.6 until I reach 60 load or 500 TPS. This gives me good cruising milage as well as a quick transition to 11.7 when I need to.

Doug.

[QWKSNKE]

I'm sorry but I must be missing something here? WHy are your load values off? Wait, dont tell me Pro-M? ahahha. Anyway, the closer you can get to 14.6 at lower cruising loads the better even supercharged. With my Whipple I stay around 14.6 until I reach 60 load or 500 TPS. This gives me good cruising milage as well as a quick transition to 11.7 when I need to.

Doug.


yeah its a univer. Based off my cruising datalogs tonight I am almost stoich when cruising. Of course that was low cruising speed until I get about a 3 minute jaunt to 60mph and 80mph when traffic cleared up.

As far as loads being high, I thought that was normal when dealing with boost.

[TheJeanyus]

As far as loads being high, I thought that was normal when dealing with boost.
My loads sure get higher when dealing with boost. :shrug:



:jester:

[Sendero]

What would settle this once and for all is to look at the load tables of the Aviator vs. 03-04 Cobra. Both have the same motor except for the Eaton. I have a feeling the load calculation tables are drastically different.

I still maintain that the load values should never go above 120% even on a boosted car.

[QWKSNKE]

i saw 130% on a light boost accelaration tonight

[Doug904]

yeah its a univer. Based off my cruising datalogs tonight I am almost stoich when cruising. Of course that was low cruising speed until I get about a 3 minute jaunt to 60mph and 80mph when traffic cleared up.

As far as loads being high, I thought that was normal when dealing with boost.

Load being higher the 100% is normal on a supercharged vehicle but at idle your load should be around the same as any n/a car. You're not making boost at idle, or atleast you shouldn't be, and unless you have your MAF too close to the supercharger then you should be fine. Now spinning air into a MAF can wreck havic on ones functions.

On a side note, I've never messed with a Univer so please excuse my stupidity, but is this a calibrated mass air? What size injectors are you using?

I think this has already been gone over but idle loads should be around 15-25% for a decent idle, I prefer more in the mid to high teens myself. Then your short terms should be 5+/-% of 0 or 1, this is how my Raptor looks at it, I'm not sure how your logger may do it.

Just let me know if I can help. Please don't misunderstand me either, I'm not trying to tell anyone how to do anything or make any claims to being a great tuner, I'm just trying to help.

Thanks, Doug.

[QWKSNKE]

I know you are just trying to help Doug.

I noticed last night the idle loads seem to be better since the new motor went in. I am going to do some more datalogs today and see what happens

[Wicked]

As far as loads being high, I thought that was normal when dealing with boost.

Normal when you are in the boost. While cruising you should not be making boost. You should have manifold vacuum during flat road cruising.

Also, I hooked up my PGM today, unfortunately it will not read over 100% load. But, I was at 100% load at about 50% throttle at 2500rpm.

[QWKSNKE]

I am not over 100 when cruising but I do vary between 30-50% depending on gear and rpm

[Wicked]

That doesn't really sound bad. Mine varies between 20-40%. Its very sensitive to throttle angle.