You still don't get the meaning of overdrive. Unfortunately, you still don't understand the way the transmission functions.
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You still don't get the meaning of overdrive. Unfortunately, you still don't understand the way the transmission functions.
Based on that description of your typical speeds, sounds like the pedal / TPS fix may get you into top gear/torque converter lockup sooner & more often.Quote:
I found it actually shifts at about 15, 25, and 45 MPH. In other words, the upshift into the highest gear (fourth) is much too late. Most 4 speed transmissions typically shift at approximately 10, 20 and 30 MPH. The delayed shift into high gear at around 45 is a major reason for delivering poor city FE. I live in suburbia. On major roads, typically the speed limit is 40.
Here's hoping you'll be reporting a jump in fuel economy soon.
I think I do. Fourth gear, in effect is 'overdrive', whether they call it that or not. There is no higher gear; it's a four speed. An automatic transmission is not fully (or solidly) 'in gear' until the torque converter locks up. That's the way a fluid drive torque converter works. But on an Aveo it doesn't lock up until 45 MPH. On most other cars it will lock up sooner, more like at about 40 or so.Quote:
Originally Posted by ontarian_frog
So what about that do I not understand?
Unfortunately it doesn't. The torque converter still doesn't lockup until 45. But at least now I can feel a pronounced up-shift into fourth gear sooner, at about 32 MPH rather than 38. So there is some improvement in the way it is shifts, and it's now more in line with the manufacturer's specs.Quote:
Based on that description of your typical speeds, sounds like the pedal / TPS fix may get you into top gear/torque converter lockup sooner & more often.
If we return to the applicable graph of shift points:
download/file.php?id=919&mode=view
we see the lockup mode (4L) illustrated on the map. According to the chart the lowest speed at which it can ever enter lockup is at about 42 MPH (68 KPH on the graph). Also, according to the graph, it will drop out of lockout mode unless a constant speed of about 40 MPH is maintained. Apparently that's the way it was designed, and there's no way to change it.
All our local speed limits are 40 MPH at most, and that's about what traffic on the road averages - so I can't go any faster than the car in front of me. If it were to enter lockup at 40, as my other car does, it would be better. Yes, that few MPH difference matters in my case. I guess I could call it the Chevy disadvantage. :roll:
When I test drove one I didn't mind it.I just new I could get one cheaper if it was a manual. Can someone explain the power button on shifter for the auto?
the hold button?
mine keeps me in 3rd gear when im in D
i never really have to go into 4th gear, its very helpful with city driving and such
How is it helpful? I didn't realize you had the auto?
instead of shifting into fourth gear at 20mph, i can stay in 3rd gear, i like it better
yeah, im stuck with an auto, i would have a small turbo in here in a heartbeat if it was a manual though
Your car does not shift into 4th gear at 20 MPH. The shift points occur (approximately) as follows: second at 15, third at 25, fourth at 35, followed by torque converter lockup at about 45 MPH, which feels like a shift but it's actually the torque converter locking up.Quote:
Originally Posted by thehunterooo
So at 20 MPH you are actually still in second and are locking in second gear. You might have more acceleration, but it won't help your fuel economy.
ah ok, that makes sense, thank you =D>
Hmm.. i see now, but what would be the direct effect of starting to roll with the hold button on? From my understanding, and from how i felt when i used it, it's supposed to give me more power by staying on the current gear. But when i tried the hold button while at 50Kmh (~30Mph) it actually down shifted. Since then i never used it in fear of messing up the gears.Quote:
Originally Posted by Thymeclock
i don't have an automatic, but are you sure it was a down shift and not the lock up turn off or on? or does anyone know if the hold button disables itself to prevent over revving / stalling?
my hold button is like being in 3rd gear the entire time, i dont think you could over-rev or stall with the button on
if im going over 30 driving normally, it will down shift to the 3rd gear, at 50 or so you should be in 4th or th overdrive, so it will down shift
but i have never been able to get proof of what the hold button is or does, but thats what im assuming
As I understand it (and from what I've observed) the hold button only affects 1st and 2nd gears. The whole purpose of it is to be able to lock the A/T into either gear for things like driving on ice and snow, where you don't want it to slip into a higher gear when your wheels are spinning.Quote:
Originally Posted by thehunterooo
That's about all it was meant to do, and that's about all it is good for.
ive read that too, but maybe its on the sceond gen aveos? I know ill shift from first to second the into D4 with hold on (3rd gear really) , then it shifts into 4th and then overdrive after i press the button again
starting out in third gear would help in snow, ice and rain, but thats how i use my hold button, like if i was downshifting on the highway to 3rd, i just press that button and im off :P
i did have a new front axle and such put in too, mabye something stange happened when i "wrecked" my car :lol: #-o
I don't know about any of this stuff, but I'm very disappointed in my car. I know it's only 4 cyl. but I expected better gas milage than what I'm getting. Have only been out on the freeway a few times since
it's a new car and I'm told to break it in easy. So I vary my speed and watch my rpms.......but, with less than 500 miles on it it's getting horrible gas milage. My other car gets better around town and it's an 8 cly.
Maybe it will do better as it gets more miles on it, but right now I wish .......... :(
I'm assuming you have an automatic. Can you tell us the points (at what MPH) when each shift occurs?Quote:
Originally Posted by GADOLL
came across this (there is hope for you yet):
since the cruze is essentially a daewoo just like the aveo, you might be able to get vince to tune the transmission for you to get better numbers.. mpg or otherwise.Quote:
Originally Posted by vine@trifecta
i have a 2010 aveo5 hat auto 14,000 i need to know on the ATI which has 5 wires 2 top 3 bottom which one is hot and which one is ground any help is better than none 2 wires on topare black and brown on bottom are white brown and green
:cool:
OK everyone here it is and I agree with everything you say about GM and their bad attitude towards Aveo owners and problematic vehicles.
While driving along at a regular pace and once the vehicle hits say 45 MPH or 2500 to 3000 RMP just quickly turn the ignition key on and off while driving and it will reset the TPS for some reason and shift into 4th gear or OD. I found this on my own and the GM dealer has no fix for the problem. This will save everyone a great deal of gas and also make your engine last longer because its RMP's are lowered. The next thing I might try on my own is to buy an EVEO Chip to see iof it will reprogram the shift points and I won't have to use my manual method of shifting into 4th gear. The Chip is only worth about $80. I will let everyone know if it works and good luck to all with the temporary fix. Please let me know if it also works for everyone out there.
Cheers Brian
It sounds to me like you don't fully understand this transmission. It's a 4-speed automatic. By 45 MPH it has long since shifted into 4th gear, which would have occurred at around 35 MPH or so. At 45 MPH the torque converter locks up, but unfortunately never before that. The car has no overdrive, per se. It only has the TC lockup which acts as a quasi overdrive - and accordingly, the only time the car gets really good MPG is when the TC is in lockup mode. If your speed drops to about 40 MPH, it goes back into slushbox mode.
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I fully understand the transmission and know it is anordinary 4 speed, with no overdrive. The same transmission is found onall Aveo’s made from 2004 to 2010. The problem is that there are a lot of thesecars out there running around in a maximum 3rd gear no matter what speed youattain. This is very hard on the engine and car overall because of the excessiveRMP. If you choose to switch the ignition key on and off quickly while drivingdown the road at anything over 40 MPG it will trick the transmission into shiftinginto 4th gear. This is a temporary fix since GM has no fix and can be usedwithout hurting anything on your car as far as I know. Since running around athighway speeds and 4000 RPM is a little hard on gas feel free to give it a tryon your Aveo if you’re having the same problem as most Aveo owners. You will bepleasantly surprised at the new lower gas consumption and lower heat that yourcar runs at.
Cheers
Brian
If the transmission isn't going into fourth gear, the cause should be pretty easy to establish. It's either the transmission itself or the TCM. You shouldn't have to resort to the process you suggested to make it work. Later models are covered by a five year warranty. I've gotten warranty work done on my 2009 when it was necessary. But it helps to know how to state your case to the dealership effectively, such that they will not give you a runaround.
Would a Pivot AT-Drive help in MPG?
http://www.pivotracing.com/files/199..._catalog-e.pdf
Hard to tell. They make no mention of the torque converter lockup point (which is what the real problem is) and that page doesn't provide the list of compatible vehicles. Also they are in Japan, so it's not available for the American market. Maybe someday we might see something similar, if the idea is marketable...
(Not Compatible with the electronic throttle car models)
the fine print of that product says:
(Not Compatible with the electronic throttle car models)
Opps... missed that out...
Looks like this is the correct one...
http://www.pivotracing.com/files/199..._catalog-e.pdf
$300! whewwww
I pass by and saw this post regarding the Automatic transmission for aveo. I also have experience with this module. If you ask me, a complete waste of money. This thing just fake throttle electronic signal, and when you are using it, the transmission did not go smoothly, and when you try decelerate you will receive a nudge when your transmission shifted down, which overall make your drive feeling suck. Completely incompatible with aveo...
Forgive my english, i came from an Asian country so...bad english for me. Nice forum with fine people you have here.
P.S. I own Chevy Aveo 1.4 A/T. In the city my petrol consumption is 7km/ltr(Extremely bad traffic in Bangkok, Thailand) and 16km/ltr outside the city. Never convert to MPG, so you might have to do your own conversion.
I'm barbrulez, i forgot my old password so i am using this login. If you drive around silom, ratprao, rama 4, sukhumvit (at 6pm), you will get the same rate as i do. If you feel like going up-country, may be go to chonburi and check your consumption, you will get close to 16km/ltr !
Before I moved down to work in Bangkok, I was working in Udon Thani and lived in Nong Khai.
Lovely open roads with very little traffic - very easy to travel around.
Even in these areas for a return trip - Udon to Nong Khai and back which was 130km's I used around 11-12 liters for the trip.
I don't think that I have ever got much more than 12km's / liter from my Aveo. Even on long journey's from Udon down to Khon Kaen or Khorat the same.
Always sticking to a regular 100-120km's per hour.
Even now, I have to make regular trips to Bangsaen, Rayong, Pattaya and Sattahip - always a similar result fuel consumption wise.
Ic may be I'm someone who drive economically :)
Because of its pathetic acceleration, I give up accelerate and let the speed climb slowly. May be that's why, and personally, I find myself getting good mileage with speed above 120km/hr.
hi guys, I'm from KL, Malaysia...
my F.C is well tracked since day 1 of getting this car (which was a 2nd hand manufactured in 06 registered in 08)
Fuelly | Share and Compare Your MPG
typically i'm kinda bad on both of my car's FC rate....not really sure if it's my driving style....or i'm just that unlucky in getting cars in bad F.C conditions....
I tried to drive more conservative and not accelarate a lot and braking at last minute.....it does not save much fuel when it comes to the aveo 1.4 DOHC sedan (notchback) yr 08.
the best i've ever gotten is 14.8km/L with driving at 90km/h consistently on highway...this was when my newborn baby was onboard...=) otherwise crusing at 110kmh/120kmh gives about 13km/L
at city typically it's very hard to even hit 10km/L on bad traffic days we get ~8km/L
averaging around 9km/L
so I think I'm gonna give fuel consumption rate a rest and start driving my chevy the way louis chevrolet would have driven it!
let's ram that RPM high and see what it's got.....
actually....the car can give really powerful acceleration if you step on it.....you have to give that extra pressure after the accelerator pedal is all the way down still....it can ram the rpm up til 5000-6000rpm that's when u get the real power of this 1.4 dohc engine hahaha....but needless to say it's not good for your engine to keep doing that.....but when overtaking and so forth....it really does the job real quick =)
so i dun think it's acceleration is pathetic at all, just that u need extra pressure EVENTHOUGH the pedal is already all the way down.... ;-)
A quick way to check would be to compare their fuel economy ratings for the same year.
I suspect they'll be identical, which would mean same programming.
Has anyone driven the same year Suzuki Swift to see if they have better shifting range for fuel economy?
If so could one ask a Suzuki dealer to do a TCM update on a Wave/Aveo to get the specifications of Aisin ?
Yes I understand that in theory, but the fuel economy ratings may be duplicates of similar/clone vehicles, not actual results of each model, so I asked for anyone's firsthand experience with shifting in other model. Or do Suzuki Enginneers follow the specs of Chevy/Pontiac, or do their own specs?
My take: If the engineers had re-programmed the trans to get better fuel economy than the Aveo, they would have had the fuel economy re-tested so they could advertise the benefit. Otherwise it why bother working on that competitive advantage?