I have an overkill tune with dod delete. You lose about 1-2 mpg but is well worth it. DOD is so annoying.
I kept my computers too. I just had him send me new ones so i always have a backup of both. if there is anything you want to know ask. I am sure i could answer whatever questions you have about the tunes |
Originally Posted by bumpin96monte
(Post 476700)
You want to get worse gas mileage on purpose, just for exhaust sound? I know what you mean by it sounding bad in DOD mode (I've got an electric cutout on my GXP)- but I just don't see it being worth the tradeoff in gas mileage unless it's just something you bring out for an occasional weekend cruise or something.
Same thing as above- just leave it in drive. Letting it get into OD and lock the converter gives lower RPM (less wear on the engine) and generally better gas mileage. I could see if you were doing a lot of passing at inner city speeds (say 35 or 40)- in a car with no power; but with all the low end torque of the LS4, you don't really need the extra rpm for normal driving. i also dont know about this whole overdrive in the city deal. i dont really know how much fuel the op would save being in overdrive at 40 and under as opposed to being in third its not like the car has any gearing to it. with the 2.90s it has in it it seems silly to me to be in overdrive at all, but then again im used to driving 3spds with 3.70s-4.11s. i think the op should do a test of city driving with od vs no od and report his findings. |
I have an overkill tune with dod delete. You lose about 1-2 mpg but is well worth it. DOD is so annoying. Over 200k miles- that's 10,000 gallons of fuel at 20 mpg, and 11,111 gallons at 18 mpg- for a difference of about 1,111 gallons over the life of the car. Multiply that by say an average of $3.75 per gallon (although this will likely be low, since I'm sure gas will go back up well above this, especially over the next 10 years, even with inflation factored in)- and that's a COST of $4200, plus the hundred or two for the tune to shut it off. That's a pretty significant cost for just having better sounding exhaust under certain driving conditions. Now, I could see if it was just a weekend car or something, but as a DD- that cost really adds up, even for only 2 mpg. I'd imagine the cost would be higher to someone who does more highway driving, and less to someone who does more city driving- but it was still just an example to show the cost beyond just the initial tune. quite a few people have reported a gain in mileage with dod off and the car tuned. Only way I could see to definitively prove it would be maybe on a dyno or something where you could control virtually all of the conditions. I can't see GM putting all the engineering time and extra costs into the cars if it had little to no affect on gas mileage. i also dont know about this whole overdrive in the city deal. i dont really know how much fuel the op would save being in overdrive at 40 and under as opposed to being in third its not like the car has any gearing to it. with the 2.90s it has in it it seems silly to me to be in overdrive at all, but then again im used to driving 3spds with 3.70s-4.11s. i think the op should do a test of city driving with od vs no od and report his findings. They have very specific reasons and testing to back up why the map was set up the way it was- and if they could've eeked a couple more mpg out by leaving in a lower gear at certain speeds, I'm sure that's what they would've done to boost the city mpg number on the window sticker. |
if i didnt drive the way i do I could get 22-23 mpg...and that would actually be a gain from stock but I dont haha
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Originally Posted by bumpin96monte
(Post 477913)
2mpg over the life of the car is pretty expensive though. Just for calculation sake, we'll throw out some numbers- say you start at 20 mpg and drop to 18 mpg.
Over 200k miles- that's 10,000 gallons of fuel at 20 mpg, and 11,111 gallons at 18 mpg- for a difference of about 1,111 gallons over the life of the car. Multiply that by say an average of $3.75 per gallon (although this will likely be low, since I'm sure gas will go back up well above this, especially over the next 10 years, even with inflation factored in)- and that's a COST of $4200, plus the hundred or two for the tune to shut it off. That's a pretty significant cost for just having better sounding exhaust under certain driving conditions. you can also have it tuned to engage at a higher speed/rpm that way it would only engage on the highway. best of both worlds. you keep the dod for fuel mileage and dont sound like a total tool bag cruising around town. oh and there was a write up on how to run dod on a toggle switch. it was on ls1 tech. this would turn dod on and off at the push of a button. no need for a tune and youd still have dod for those long highway drives. i wouldnt try it unless i was certain of my wiring skills. also i thought dod only engaged in 4th gear, 35mph and above, 1/4 peddle, or less? i could be wrong on that. most of the time during city driving your not really cruising around at 1/4 peddle especially street light to street light. |
LEW TUNE got rid of my DOD you need a tuner and get a hold of LEW here on the fourm
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Any performace shop can tune that out. And they will give you a beter tune then tune in a can.
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Thanks guys for all the input. Will get something done when the cash rolls in. I am not sure I have any performance shops around.
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Originally Posted by Tadcaster
(Post 478209)
LEW TUNE got rid of my DOD you need a tuner and get a hold of LEW here on the fourm
You purchased a car with a V8 in it so thats what I want. if I want a 4 banger I would have purchased a car with a 4 banger!! |
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