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Scion tC 1G Drivetrain & Power Engine and transmission discussions...

gearing for 5-speed tc's to save gas

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Old Feb 28, 2009 | 02:02 AM
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Default gearing for 5-speed tc's to save gas

at what rpms do you gies shift from first to second someone told me about 2500 to save gas try not to over over 3500 roms from 2 through 4th gear...

seems like first gear on the tc's is kinds short....
Old Feb 28, 2009 | 02:20 AM
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they made it short on purpose.

i don't really rely on a specific rpm to shift as it really depends on your driving conditions and your environment.

i probably shift more around the 3-4K area though on a typical drive
Old Feb 28, 2009 | 02:36 AM
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ive noticed in first gear to second to get the car moving quick you would have to shift about 3k to 3500 rpms

some people say a CAI and exhasut help make 1 st a little longer or smkaes the car move quicker so its not a s short depending on driving condition....but you have to shift fast
Old Feb 28, 2009 | 02:46 AM
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uhh.. no.
Old Feb 28, 2009 | 03:11 AM
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lololol.
how the hell would CAI and exhaust change the tranny.

if you really want to monitor your MPG, buy a Scangauge and call it a day.
Old Feb 28, 2009 | 04:01 AM
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thats what i said honeslty i have no idea...i guess it gives the car a little more boost or something... its the way it was made it what i said
Old Feb 28, 2009 | 06:25 AM
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naw.. if anything, you lose low end torque with an aftermarket intake...
Old Feb 28, 2009 | 08:43 AM
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the user manual tells you to shift at 15mph (1st to 2nd gear), 25mph (3rd), 40mph (4th) and 45mph (5th)...its usually around 3000 rpm except for 45mph which is 2750ish.
Old Feb 28, 2009 | 11:42 AM
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i do a solid 3k for every shift... :D
Old Feb 28, 2009 | 01:46 PM
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about 2500 rpms to 3500 rpms depending on the situation...

anything over that would burn more gas...

thanks gies for all your input
Old Feb 28, 2009 | 04:56 PM
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so you were asking.. now you are telling us where to shift ?

I shift where the car likes to shift, which is about 3000 - 3500 rpm most time. I average 25 mpg overall.

And just out of curiosity.. what are "gies" ? :D
Old Feb 28, 2009 | 05:01 PM
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actually i looked it up first before making a thread then i made a thread just to get more of and answer so please forgive me..people were asking me on youtube i said it all depends where you are...then i came here to look it up got decent answrers so i made this thread just to get opions thats all
Old Feb 28, 2009 | 05:22 PM
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If you're looking to save gas, it's not just about when you shift but how fast you're getting to that point. Slow and steady will save you more gas. The farther you put your foot into it, the more gas you're using.
Old Feb 28, 2009 | 05:40 PM
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why would you buy a tc if you wanted fuel economy?

if you want better mileage get a yaris or a honda fit.
Old Feb 28, 2009 | 05:55 PM
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+1 or an automatic tC or any other 2 door I-4 not so short geared (my bias here, cause I dont like 4 doors)

ugh 4dr, Corolla or xD?

I'm sure even a Corvette gets better mpg

short shift, accel slowly, and watch your speeding
Old Mar 6, 2009 | 12:45 AM
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usually during the week i drive like a little old lady shift at about 2500 and just take my time and on average i consistently get 28 to 32 mpg if that helps you out. driving hard MY tc burns fuel like crazy tc reviews will say the exact same thing if you take the time to read them
Old Mar 6, 2009 | 01:47 AM
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Originally Posted by siegs87
usually during the week i drive like a little old lady shift at about 2500 and just take my time and on average i consistently get 28 to 32 mpg if that helps you out. driving hard MY tc burns fuel like crazy tc reviews will say the exact same thing if you take the time to read them
I do the same, accelerate slowly usually shift around 2500. My daily commute is mostly highway, and I get 32-33mpg with that. When I do a lot of city driving it's 28-30mpg.
Old Mar 6, 2009 | 02:06 AM
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Originally Posted by pinoyFMtC
Originally Posted by siegs87
usually during the week i drive like a little old lady shift at about 2500 and just take my time and on average i consistently get 28 to 32 mpg if that helps you out. driving hard MY tc burns fuel like crazy tc reviews will say the exact same thing if you take the time to read them
I do the same, accelerate slowly usually shift around 2500. My daily commute is mostly highway, and I get 32-33mpg with that. When I do a lot of city driving it's 28-30mpg.
Like he said accerlerate slowly shift under 3k,for me i only work 2.5mi from home,with a full tank of gas it'll last me a good 2week. And if do g do summin then a week and half. and driving my car hard from home to work,it'll last me about a week.

and besides all that,you wouldn't get fcukd with if your modded with exh n etc...
Old Mar 6, 2009 | 04:33 AM
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first gear i shift at around 3k-5k
2-5 goes from 3k or less.

i think first gear is way to short.
Old Mar 6, 2009 | 06:28 PM
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Fuel economy is not solely RPM based. In fact, a motor is MOST EFFICIENT in producing power from fuel when running at full throttle, at very high RPM. Though, this doesn't translate into good "distance per gallon."

RPM is a factor, but not the sole factor. When cruising at 70mph on the interstate, you're turning over 3000 rpms... yet, you still get ~30mpg! If it were solely rpms, then this real-world observation wouldn't make sense.

In fact, get a Scangauge, and cruise on the interstate at the top of 3rd gear. Set the cruise control, but of course don't do it for long. You'll notice a reduced number, but still over 20mpg.

Your ACTUAL enemies for good MPG are:

1) Acceleration habits.
2) Weight (specifically, engine load).
3) Terrain (as it influences apparent weight of vehicle).
4) Displacement.
5) Adjusted displacement (if turbo/supercharged).
6) Tuning parameters.
7) Wind resistance, in combination with drivetrain resistance.

Now, a little analysis of each one. Let's knock out the ones that you can't control first.

3) You can't control terrain for your daily commute.
4) You cannot change the physical displacement of your motor.
5) Most of us aren't turbo, and those of us who do go turbo, don't care about MPG for obvious reasons.
6) Unless you're 100% managed by a standalone that completely bypasses/overrides ECU... this isn't you either.
7) Outside of adding tire air pressure and driving slower to reduce wind, it's impractical to alter resistances.

So you're down to:

1) Acceleration habits.
2) Weight.
3) Tire pressure, and drive slower to reduce wind resist.

Changing your gears --- won't help enough to justify the project and expense.

---------------------------

1) Don't brake, conserve momentum as much as possible. Accelerate AS SLOW AS TOLERABLE.
2) Carry as little weight as possible.
3) +5lbs of tire pressure. Go 65 instead of 70. Get smaller, lighter rims. Smaller, harder tires, with more pressure. etc.

There are some other tricks that hypermilers do... such as engine braking, since this actually cuts all fuel to the cylinders, rather than a small amount during idle. Not sure if it's worth wear/tear, and it may be make/model specific.

For the most part, don't drive stupid, and enjoy your tC.



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