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Old 06-09-2007, 01:53 AM   #11
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boofighter -

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the thing is the sunfire has a 3spd auto. when i am going 100kph the rpms are at 25-2600 when i move up to 110kph it sits just under 3000. to me that is a lot. my sister has the exact same car and engine, but with 4spd auto, and at 110 she is turning about 2100 rpm.
Rats. 3 speed. After omgwtfbyobbq posted this URL ...

http://car-part.com/

... I started trolling around for "economy transmissions" for my Saturn. At a later point in time, with alot of homework and a little patience, you may elect to swap in a low mileage used one. If I had the skillz (aka save money by getting my hands dirty), that's what I would do.

CarloSW2
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Old 06-09-2007, 01:37 PM   #12
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Boo' , are you using synthetic fluid in the crankcase and transaxle ? Big fan of it myself (will be switching at my first interval ) . Freeway driving over 55 mph with that 3 spd auto is a toughy , but still you *are* 6 over EPA so there is plenty of hope ! Keep working at it .
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Old 06-09-2007, 01:48 PM   #13
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Originally Posted by boofighter View Post
the thing is the sunfire has a 3spd auto. when i am going 100kph the rpms are at 25-2600 when i move up to 110kph it sits just under 3000. to me that is a lot. my sister has the exact same car and engine, but with 4spd auto, and at 110 she is turning about 2100 rpm.
Yes, my car also had the same 3 speed 3t40 transmission. It would get 31-33mpg hwy. 31mpg a/c on @75mph. It got 25-26mpg commuting while using the a/c. I still think your o2 sensor could be tired.
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Old 06-09-2007, 01:51 PM   #14
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boofighter -



Rats. 3 speed. After omgwtfbyobbq posted this URL ...

http://car-part.com/

... I started trolling around for "economy transmissions" for my Saturn. At a later point in time, with alot of homework and a little patience, you may elect to swap in a low mileage used one. If I had the skillz (aka save money by getting my hands dirty), that's what I would do.

CarloSW2
A 4 speed auto swap would be nice but its electronic vs the 3 speed which only has electric torque convertor lockup. It uses a TV cable to control shifts. On the plus side the 3 speed is a tough & simple unit thats easy on the fluid.
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Old 06-09-2007, 02:40 PM   #15
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lovemysan -

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A 4 speed auto swap would be nice but its electronic vs the 3 speed which only has electric torque convertor lockup. It uses a TV cable to control shifts. On the plus side the 3 speed is a tough & simple unit thats easy on the fluid.
Good stuff to know. I was assuming they were very similar trannies.

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Old 06-09-2007, 07:43 PM   #16
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Good stuff to know. I was assuming they were very similar trannies.

CarloSW2

I thought so too. I long considered the 5speed swap but I was scared of dealing with PCM differences and wiring. You could look over at jbody forums. Someone's bound to have done a swap.
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Old 06-09-2007, 10:34 PM   #17
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I thought so too. I long considered the 5speed swap but I was scared of dealing with PCM differences and wiring. You could look over at jbody forums. Someone's bound to have done a swap.
been over at the j for a while. they don' t like the whole idea of slowing down to save gas. they did have good info about the swap, and it is not worth it. for the price i can buy a car with a 5 speed.

will have to live with it for a while. went to look at a 5spd acadian today. $600 might pick it up.
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