The Pectel is only the size of... two packs of playing cards. You just velcro it to the side of the stock computer. You don't need to "make" room. Unless you've already go extra equipment BEHIND the glove box...
Naz, you can run either way. You can just tune it for stoichiometric while cruising, and run like that. This requires however, that you get the base maps PERFECT, and you also have to have the modifiers (air temp, barometric, etc...) PERFECT.
If you do that, you should be able to get 25mpg out of it. I don't know how much Chris is getting, I was under the impression it was 22ish. Still, not bad compared to a Mustang or SUV you could be driving...
The problem is, getting those tunes PERFECT, requires a LOT of work, you'll need your own Wideband, and a lot of time.
The other way to do it, is to just get them "close", (say 95% of Pefection), and then hook up the O2 sensor to the Pectel.
You can run either way. Whatever you want...
You still need to have your base maps well done, or you get some serious drivability problems (ask me...). But it allows you to slack off a little, and not be perfect with all your modifiers, because it will compensate for the weather for you.
Now, I caution you, you HAVE to be in the right neighborhood, because at WOT it doesn't use the O2 sensor, so you'll be screwed if you don't have the modifiers in the right place.
You should be able to get the base maps right, and have them "in the 14's" at cruise, across the board. Then, you can add the O2 feedback, and let it hit 14.7 bang on.
If you do that, I'd think you could get similar milage to stock.
I used to get 29-31 MPG stock. After I added the AC with 5th injector, I was getting maybe 27. It's just as good at cruise, but you get greedy with the boost, and burn fuel.
When I added the Pectel, right now I'm getting about 25mpg, and I'm VERY greedy with the boost because it's just too damn much fun, and the midrange is SOOO much more powerful than the 5th injector, it's addictive.
I probably boost away from 50% of lights...
So, I think I'm doing pretty good.
My only problem is the base maps are not great, I just haven't been able to since I wasted all my money on that dyno... 2 hours should have been plenty to get the base maps good, if the dyno operator wasn't clueless.
What happens is you'll be in one cell, cruising, and it develops a correction based on O2 feedback. Then, you speed up a little, you're in a new cell, and it keeps applying the old multiplier. If the new cell needs a different correction than the previous one, then it will be off.
The other thing is, with the Pectel you can input a wideband O2 instead. With this, you could actually tune for a lean burn cruise. You could cruise at 16 or 17:l, and maybe pull off 35-40mpg...
Edit: Okay, what does my O2 gauge do?
Well, if I enter a new cell, it will be either rich or lean. Then you see the correction happening, and it will pull the mixture to stoich. Once it hits stoich, it starts bouncing around like stock. That's normal.
Personally, I find the O2 more trouble than it's worth. Once I get a wideband and get everything dialed in, I'll probably just yank it. Just tune for maybe a 15:1 cruise, and then you're done.
You really don't NEED the O2 feedback, if you tune it right. You should be able to get the same milage without it. The only reason stock cars have them is because:
A)to compensate for changes in the car from manufacture, or age. It's an automatic compensation. We don't need this, because we should be constantly monitoring things anyway, and tuning for perfection. That's the point of the Pectel, to gain control, and tune it right yourself.
B)Catalytic converters actually don't work well right at 14.7:1. They NEED to be bouncing back and forth a few points either way, rich-lean, back and forths.... I don't know why. But... trust me, you can take that as gospel, I got it from a very reliable source.
[ 11-03-2002, 10:07 AM: Message edited by: P-51 ]
