Keeping the car in 4-cylinder mode?
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From: Dallas, TX
Keeping the car in 4-cylinder mode? Is there any way to tune the car or modify the car to where you can either manually switch displacement on demand/active fuel management ON or have it come on more often/sooner? Gas is expensive and I really don't see why I need to be in V8 mode when I'm driving stoplight to stoplight or stop sign to stop sign in 30 mph areas. 
You can change the tune to enable DoD in lower gears, but there's no point. Engine load under acceleration is too high for DoD to enable with the stock settings - you could tune for that, but it would really screw up how DoD operates at highway speeds. It is not possible to tune it for individual gears; enable/disable parameters are global settings.
Want better gas mileage? Ditch the V8 and buy a four banger.
Want better gas mileage? Ditch the V8 and buy a four banger.
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From: Dallas, TX
What are the parameters for DOD to kick in? Anybody know when it kicks in with some technical data at all?
I'm possibly/probably ignorant, but I'm thinking that if DOD kicks in at say... 10% throttle in gears 3 and 4, then perhaps it could be changed to kick in at say... 20% throttle in all gears.
Any input from people who have done tuning would be cool, because I've never done it or had it done.
I'm possibly/probably ignorant, but I'm thinking that if DOD kicks in at say... 10% throttle in gears 3 and 4, then perhaps it could be changed to kick in at say... 20% throttle in all gears.
Any input from people who have done tuning would be cool, because I've never done it or had it done.
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From: CT
What are the parameters for DOD to kick in? Anybody know when it kicks in with some technical data at all?
I'm possibly/probably ignorant, but I'm thinking that if DOD kicks in at say... 10% throttle in gears 3 and 4, then perhaps it could be changed to kick in at say... 20% throttle in all gears.
Any input from people who have done tuning would be cool, because I've never done it or had it done.
I'm possibly/probably ignorant, but I'm thinking that if DOD kicks in at say... 10% throttle in gears 3 and 4, then perhaps it could be changed to kick in at say... 20% throttle in all gears.
Any input from people who have done tuning would be cool, because I've never done it or had it done.
there are a whole lot of parameters that need to be met in order for DOD to activate... rpms, throttle position, vacuum pressures, engine load, etc etc...
you can find all DOD info here in the Word docs:
http://gmls4.com/index.php?topic=9.0
.
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2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
Thread Starter
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From: Dallas, TX
Air filter's clean... tires are properly inflated... carrying less than 15 pounds of junk with me... and rotten mileage just because there are so many stop signs and stop lights in my area. Being able to be in 4-cylinder mode more often would really help.
I've even determined the best way to get good mileage in my GXP is to accelerate to 30 in 1st, shift into 2nd and immediately into 3rd when not in traffic. If the speed limit is 35 and I'm on a short drive, I'll put it in 4th. Can't do that on a long drive because it heats the transmission fluid up after about 30 minutes of driving.
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This is not a good car for MPGs with regards to stop and go. You need to walk, ride your bike, public transportation, or get a scooter because it sounds like you have done just about everything you can to "improve" mpgs with the LS4 in city driving.
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When I am home I primarily have your driving situation. It sucks man however a friend of mine is a hypermiler to the hyperest. I do a procedure called pulse and glide. I take off 2nd gear at 20 3rd gear at 30 and if I get up to 45 4th. What I do is say speed limit is 30. accelerate to about 35 mph gently let it coast down to about 28 ish. while doing this watch your instant and you will notice it goes up really high when you are coasting. My friend uses this method with a bunch of other tricks we don't have (electric motors and manual control of them 5 speed and like a 5 hp brigs haha) anyways he can easily rip of 100 mpg runs to and from work, when the weather is warm. That is another factor I have noticed I just came back to indy and got 27.2 for the trip. A month ago i got about 23. I did go a little easier on it but still drove pretty close to the same.
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From: Dallas, TX
I thought about doing that ('96 to '97 V6 Camaro), but I think the cost of insuring it would offset the amount of money I save on gas.
I love the GXP too much to get rid of it.
Didn't GM have a concept car a few years back with an electric motor in each wheel? How about two of those for the rear wheels?
That's kind of an interesting idea. I use the cruise control once I stick it in 4th so I don't have to manually feather the gas when going just over 30 mph in 4th, which helps a lot, but getting up there is rare.
I only use 2nd gear when I am...
...behind somebody in traffic and I can't quickly accelerate in 1st up to 30
...don't need to go all the way to 30 or 3rd gear because the next stop sign or light is too close
If you want to try hypermiling your car a bit more, take my advice and basically skip 2nd gear for accelerating. For getting on the highway, to be the most fuel efficient (that I've been able to get) is accelerating up to 40 in 1st, shift to 2nd, and get up to the speed limit in 2nd, then shift quickly to 3rd then 4th.
The gear ratios in these cars are not particularly good. 1st is good, it tops out at about 50, but 2nd tops out around 90+ so unless you're going faster than about 35 or 40, it's not all that useful for accelerating. And then 3rd is fine at around 1:1, but 4th is bad because it isn't low enough. You really shouldn't be able to get into your highest gear at 20 miles per hour IMO. I wish 2nd topped at 70mph and that 4th was lower or we had a 5th.
I love the GXP too much to get rid of it.
Didn't GM have a concept car a few years back with an electric motor in each wheel? How about two of those for the rear wheels?
I do a procedure called pulse and glide. I take off 2nd gear at 20 3rd gear at 30 and if I get up to 45 4th. What I do is say speed limit is 30. accelerate to about 35 mph gently let it coast down to about 28 ish. while doing this watch your instant and you will notice it goes up really high when you are coasting. My friend uses this method with a bunch of other tricks we don't have (electric motors and manual control of them 5 speed and like a 5 hp brigs haha) anyways he can easily rip of 100 mpg runs to and from work, when the weather is warm. That is another factor I have noticed I just came back to indy and got 27.2 for the trip. A month ago i got about 23. I did go a little easier on it but still drove pretty close to the same.
I only use 2nd gear when I am...
...behind somebody in traffic and I can't quickly accelerate in 1st up to 30
...don't need to go all the way to 30 or 3rd gear because the next stop sign or light is too close
If you want to try hypermiling your car a bit more, take my advice and basically skip 2nd gear for accelerating. For getting on the highway, to be the most fuel efficient (that I've been able to get) is accelerating up to 40 in 1st, shift to 2nd, and get up to the speed limit in 2nd, then shift quickly to 3rd then 4th.
The gear ratios in these cars are not particularly good. 1st is good, it tops out at about 50, but 2nd tops out around 90+ so unless you're going faster than about 35 or 40, it's not all that useful for accelerating. And then 3rd is fine at around 1:1, but 4th is bad because it isn't low enough. You really shouldn't be able to get into your highest gear at 20 miles per hour IMO. I wish 2nd topped at 70mph and that 4th was lower or we had a 5th.
Last edited by Brangeta; May 4, 2011 at 03:32 PM.
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On The Tree
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I have read about the high cat temp it is a emissions thing. I think DIABLEW does something with it. Several people have it done I believe.
As for the engine braking if you are letting it rev a lot higher then it could but how much is prolly small. I do all the time just so I can hear the exhaust!! Also keeps me from squeaking my breaks in traffic (they are horrible)
As for the engine braking if you are letting it rev a lot higher then it could but how much is prolly small. I do all the time just so I can hear the exhaust!! Also keeps me from squeaking my breaks in traffic (they are horrible)
x2
i hope you guys like replacing the trans putting it on o/d at 35mph!!!!!!!
that kind of crap puts so much stress on the motor and trans that sooner or later **** is gonna get fucked up
not to be a dick but if fuel consumption is THAT big of a problem its time for something else "how fast can you afford to go" is the question
i hope you guys like replacing the trans putting it on o/d at 35mph!!!!!!!
that kind of crap puts so much stress on the motor and trans that sooner or later **** is gonna get fucked up
not to be a dick but if fuel consumption is THAT big of a problem its time for something else "how fast can you afford to go" is the question
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From: CT
BUT - that only gets disabled if someone totally removes their Cat... if you still have a Cat on the car, even a high-flow one, that needs to stay on/active, otherwise you could burn it up...
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2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com