bshull
Member
My first impression is WOW!
I put the ATT and Heath tune on this morning and did the season thing found in the instructions. Then just a little while ago I went out to have some fun. Fun it was, my burb is a K1500 with 3.42 gears and a whipped motor. My goal is fuel economy.
First off the ATT is not completely broken in yet and I think it will get even better with a couple of miles on her, while cruising at 60 mph I have just enough boost to move the boost gauge on flat and level road, this is great as long as i am not blowing black smoke (I will have to check for smoke during daylight hours), why make boost if you don't need it. If I tip in the throttle, a bit more boost shows up and the truck starts to speed up. In town I did not notice any lag or loss of acceleration as compared to the factory tune and turbo. Lets face facts, this is a 95 burb with 3.42 gears, it is not a race car and I have no desire to race light to light. Not too bad, so far so good.
Now for the fun stuff, the stuff that makes the mpg go down. I spoke with Bill Heath about the tune and how I planned to drive it. Economy was number one but when I wanted to pass someone or something I wanted all the power the 6.5 with 3.42 gears could muster. Bill suggested an economy tune with a twist. I would have the usual economy tune up to about 80% throttle, after 80% the fuel would be really turned up and the transmission would act accordingly. You do notice when you reach that magical 80% :grin:. With the truck at 60 mph I put the throttle down, boost will rise to 13 psi and the truck really starts moving
. The truck did push me back in my seat and held a little push till I let off, not a lot, remember this is a 95 burb with 3.42 gears. What I noticed the most is the difference between this configuration and stock, stock would drop boost as RPMs climbed past 2200 rpm and felt as if you lost acceleration. Not with the ATT and Heath tune, she just keeps pulling and pulling. I backed off the throttle at 100 mph for the sake of the engine, she was still pulling and still accelerating. EGT went to 10,500 and just held there, what a relief in case someone barrows the truck, now I do not have to worry about someone melting a piston just because they wanted to drive fast, pulling a trailer might be a little different but I will cross that bridge later.
The proof will be in the pudding, economy is the number one goal, I can't wait to get a few tanks of fuel through her on the highway. Before the turbo and tune I got 17 mpg to St. Louis and back this week. 17 mpg seemed to be the norm for this truck, sometimes a little better and sometimes a little lower. When I leave home for work I mostly travel interstate or comparable highway with speeds ranging from 65 to 80 mph and I feel 17 mpg from this rig is acceptable. I'm looking to better that, hopefully I have made the right choice, at the present I am very happy, the burb, it drives a lot better.
Hopefully next week my P-400 will show up and then I'm done wrenching on her for a while :hihi:
Brian
I put the ATT and Heath tune on this morning and did the season thing found in the instructions. Then just a little while ago I went out to have some fun. Fun it was, my burb is a K1500 with 3.42 gears and a whipped motor. My goal is fuel economy.
First off the ATT is not completely broken in yet and I think it will get even better with a couple of miles on her, while cruising at 60 mph I have just enough boost to move the boost gauge on flat and level road, this is great as long as i am not blowing black smoke (I will have to check for smoke during daylight hours), why make boost if you don't need it. If I tip in the throttle, a bit more boost shows up and the truck starts to speed up. In town I did not notice any lag or loss of acceleration as compared to the factory tune and turbo. Lets face facts, this is a 95 burb with 3.42 gears, it is not a race car and I have no desire to race light to light. Not too bad, so far so good.
Now for the fun stuff, the stuff that makes the mpg go down. I spoke with Bill Heath about the tune and how I planned to drive it. Economy was number one but when I wanted to pass someone or something I wanted all the power the 6.5 with 3.42 gears could muster. Bill suggested an economy tune with a twist. I would have the usual economy tune up to about 80% throttle, after 80% the fuel would be really turned up and the transmission would act accordingly. You do notice when you reach that magical 80% :grin:. With the truck at 60 mph I put the throttle down, boost will rise to 13 psi and the truck really starts moving
. The truck did push me back in my seat and held a little push till I let off, not a lot, remember this is a 95 burb with 3.42 gears. What I noticed the most is the difference between this configuration and stock, stock would drop boost as RPMs climbed past 2200 rpm and felt as if you lost acceleration. Not with the ATT and Heath tune, she just keeps pulling and pulling. I backed off the throttle at 100 mph for the sake of the engine, she was still pulling and still accelerating. EGT went to 10,500 and just held there, what a relief in case someone barrows the truck, now I do not have to worry about someone melting a piston just because they wanted to drive fast, pulling a trailer might be a little different but I will cross that bridge later.The proof will be in the pudding, economy is the number one goal, I can't wait to get a few tanks of fuel through her on the highway. Before the turbo and tune I got 17 mpg to St. Louis and back this week. 17 mpg seemed to be the norm for this truck, sometimes a little better and sometimes a little lower. When I leave home for work I mostly travel interstate or comparable highway with speeds ranging from 65 to 80 mph and I feel 17 mpg from this rig is acceptable. I'm looking to better that, hopefully I have made the right choice, at the present I am very happy, the burb, it drives a lot better.
Hopefully next week my P-400 will show up and then I'm done wrenching on her for a while :hihi:
Brian
