I recently bought and installed a chip from DP Tuner
. Jody was great to talk to and very helpfull in suggesting what I should get. I ended up w/ a 4 possition chip. It has 1. Stock, 2. 40 HP tow, 3. 80 HP econo, 4. 100HP play. I imediately loved the new found power. Wow! is all I could say for the first few days. Well now that some time has passed, I've been able to wipe the stupid grin off my face and really start paying attention to how the truck reacts on certain settings.
A little background info before I get to my observances and questions. My truck is as list in sig. Nothing special. The only mods I have that will affect the chip are a home made open air Tymar style air filter, and 3" down pipe, and a gutted cat. Previous to installing the chip, I consistently got 23-24.8 mpg. I use my truck to haul my 200 lb butt to work. 70 miles round trip. All flat, unloaded, 55-60 mph. Through-out all my chip testing I have not changed the way I drive from before I had the chip.
Now, after installing the chip I played around w/ it to see what the most fuel consious setting was going to be. I started out on the 80HP program. The truck would almost lunge forward when I let off the clutch while it was set on 80. So I decided to set it on 40 as long as I was on neighborhood streets and click it up to 80 when I entered the freeway. I drove like this for an entire fill-up. I yielded 22.8 mpg. A little dissappointed, I continued on. The next fill-up, I left the chip on 80 all the time and never touched it. Mileage got a little better. It went up to 23.2. The next fill-up I treated a little different. I wrote down the mileage when I switched tanks so I could calculate the front tank seperatly from the rear tank. During this fill-up I left the chip set to 80 for the first tank and put it on the stock setting for the second tank. Much to my suprise they each calculated to 24 mpg. Why?
I'm on the 4th fill-up since installing the chip. It's been set to stock since I filled up the other day and I've already driven farther than I have previously been able to w/ the chip on 80 and the fuel gauge is still showing above full.
Is all this normal? What should I be expecting for a mpg increase if any? Will getting a 4" exhaust help out any. So far I haven't had any trouble with high exhaust temps, but if it takes a 4" exhaust to get better miles then I'm up for it.
Now for a few questions about the chip programing. I've noticed that at the first startup of the day the glow plug light will come on for a few seconds, but while the truck is still hot, the GP light will only flash. The amp guage also reflects this. When starting cold, the needle shows a draw for 30-40 seconds. When starting hot, the gauge will come up right away. Is this a setting built into the chip or is this an unrelated issue? Also, when it's set on the stock setting and I start the truck (hot or cold) it sounds like the EBPV will cycle once after the engine has been running for a few seconds. Is this normal?
Thanks for any comments or insight anyone can offer.