I have a 97 sunfire with the 4 speed auto. Is there a trans made with over drive that will bolt up besides the manual. The car is pretty much my daily driver, but I want to take it on trips too. Right now I use my camaro for trips because I get 30mpg highway. The sunfire got 17 on my last highway trip.
The 4 speed does have overdrive, plus torque converter lockup as well if I'm not mistaken.
Why is my motor reved up soo high then? Its reved up to close to 4k when I cruise highway. I also noticed when it shifts into the last gear the rpms don't drop much. Does this trans just have bad gearing for highway?
Is there a CEL on? Sounds to me like it might not be shifting into overdrive.
CEL = Check Engine Light
The engine should be turning around 2300 RPM at 60mph in 4th gear with the converter in lockup. (OD = Torque converter lockup in 4th gear). If you do have a 4spd auto, it sounds like it's not popping into 4th gear. Or 4th gear is slipping really bad.
How fast are you going at 4k rpm? Are you doing the speed limit, or faster than it?
2300 sounds about right at 60 i do over the speed limit prob like 75-80 usually. Sorry im used to ses service engine soon. I guess im used to taller gears. Anyways is there any 5 speed auto that will fit the 2.2? If not do u know of any other good highway vehicles that are auto with my cruising speed so high?
Any domestic 4 door sedan with a V6 should give you lower rpms at your cruising speed and not be too hard on fuel.
i looked on my way home, in 4th doin 60 my rpms are at 2600-2700. 4th really shouldnt slip either there really isnt ever that much torque on that gear and my car doesnt have a crap load of miles.
SHOoff wrote:The engine should be turning around 2300 RPM at 60mph in 4th gear with the converter in lockup. (OD = Torque converter lockup in 4th gear). If you do have a 4spd auto, it sounds like it's not popping into 4th gear. Or 4th gear is slipping really bad.
(this is for the bold printed statement for clairification) Actually, 4th is an over driven gear. Since the TC is a fluid coupling, there is some fluid shear, even at crusing speeds. Torque Converter Clutch (TCC) lock-up only occurs in top gear. The TCC lock-up is to remove all slippage caused by the fluid shear, to further reduce the rpms at crusins speeds, to help fuel economy. This applies to both the 3sp and the 4sp.
As for the rpms @ 60mph, that depends onn the final drive gear ratio. Your RPOs (on the bottom of your spare tire cover) will tell you what final drive ratio you have, using an
RPO decoder. From there, you can figure what rpms you should be turning.
For those interested here's the formula for crusing RPM @ 60 MPH:
(60 MPH * FINAL DRIVE RATIO * 336) / TIRE DIAMETER = Cruse RPMs @ 60 MPH
I didnt see the final drive gear ratio on the bottom the the spare cover would it be anywhere else i tried looking in all the usual spots on a car. on the bottom of the cover i saw spare instuctions and the service parts indentification list. So are there no 5 spd autos for this motor?
You should see a lable (the SERVICE PARTS IDENTIFICATION list) on the bottom side of the spare tire carrier that looks like this:
Just type the alpha-numeric codes into the spaces in the RPO decoder and it will give you what each code means, one of which will give you the gear ratio.
As of yet, there are no 5sp autos that will reasonably be made to work with these cars.
