Guest RedCutlassSL Posted January 10, 2003 Report Share Posted January 10, 2003 For those of you with the 3100, what is your RPM at when you are going 70? Mine is hovering around 3000, and that seems high, I can't remember what it was before I had those problems with my transmission last week. Thanks Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 10, 2003 Report Share Posted January 10, 2003 Hey my sister's 96 GP with 3100 does about 2000 in overdrive at 70. Your tranny may not be going into overdrive. I know my 3.1L will do 3000 at 70mph if it is not in overdrive when the torque converter is locked in for better gas mileage. But to me, it sounds like your not in overdrive, maybe a sensor or linkage problem, not real sure though. Quote Link to comment Share on other sites More sharing options...
Guest RedCutlassSL Posted January 10, 2003 Report Share Posted January 10, 2003 SONOFABITCH!!! I just had it fixed. What can I do to remedy this? Quote Link to comment Share on other sites More sharing options...
90lumina3.1 Posted January 10, 2003 Report Share Posted January 10, 2003 tis odd... i seem to have the same thing with my 3.1 when it is in overdrive. or maybe its a little lower, anyways... its prolly not in overdrive Quote Link to comment Share on other sites More sharing options...
Guest Posted January 10, 2003 Report Share Posted January 10, 2003 Yeah that's way high, my 3100 sits around the 2000 mark as well. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 11, 2003 Report Share Posted January 11, 2003 My TGP goes around 2500-2800 at 70. And that is in overdrive with the tc locked up. Quote Link to comment Share on other sites More sharing options...
Guest RedCutlassSL Posted January 11, 2003 Report Share Posted January 11, 2003 I'm just gonna bring it back, they can fix it (the mechanics), I'm gonna borrow my girls Focus to get around for the day. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 11, 2003 Report Share Posted January 11, 2003 AHHHHHHHHHHH, not a focus! As long as it gets you from A to B I guess. Quote Link to comment Share on other sites More sharing options...
toastemcutlass Posted January 11, 2003 Report Share Posted January 11, 2003 hey maybe the car is stuck in open loop mode? I believe the trans won't go into final drive if the car is cold or "open loop mode" Quote Link to comment Share on other sites More sharing options...
godofthunder Posted January 11, 2003 Report Share Posted January 11, 2003 My 3100 also is about 2000 at 75MPH. BTW....this is really stupid, but how do you know when the Tourqe Converter locks up? And simply, what happenes? Is it something manually changed, or computer/mechanicly controled. Jon Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 11, 2003 Report Share Posted January 11, 2003 The torque converter locks up in 3rd gear. You can usually feel it, it feels like it is shifting into another gear. In normal acceleration it locks up just before going into overdrive. In an automatic, the actual flywheels, I guess, are turned by the fluid surrounding them, they never touch. Like the engine tuns a disk that turns fluid that turns the TC that inturn turns the tranny. When the TC locks up, the two disks actually intertwine and touch and become one unit, they lock up. So, the fluid is not turning the TC the engine is directly. This saves on gas mileage mainly. Quote Link to comment Share on other sites More sharing options...
cmo1234 Posted January 11, 2003 Report Share Posted January 11, 2003 So i just want to be clear on this TC question posted above. I've never been to sure on this either... So my 90 Euro is a 3 speed automatic (PRND21). Is 3rd gear "D" considered overdrive? Or when it TC locks up is this considered overdrive? I does feel like another shift when this happens. And BTW my car does cruise at 2800-3000 around 70mph and around 2100 at 55mph. Also one more question, didnt want to create a whole new post for this: What is a Plenum? I see you guys talking about it all the time but have not been able to figure out what it is, thanks. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 11, 2003 Report Share Posted January 11, 2003 The "plenum" is the intake manifold. The one on top that the throttle body is connected to. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 11, 2003 Report Share Posted January 11, 2003 Yeah, on your gear selector, you have 1,2,D and a D with a circle around it right?? Just plain D is 3rd gear and in third gear the TC locks up. Then after that, you go into over drive, or the D with the circle around it that actually is an "O" for Overdrive. So, you have only four gears, 1st 2nd, 3rd and Overdrive. But, it will feel like you have 5 gears, b/c of the TC locking up. When it locks up it keeps the same ratio as your third gear, 1.00:1., its just more fuel efficient. If you have any other ?s feel free to ask. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 11, 2003 Report Share Posted January 11, 2003 Sorry for the second post but, I missed what you meant by "PRND21" Anyway, yeah your "D" should be your overdrive. You have the 4T60 tranny, right?? Check on your tranny pan to check. That is what I have and in overdrive you should be around 2000 at 70mph, that is where mine runs. And if I am in third and the TC is locked up, I run about 2800-3000 at 70mph, it still sounds like your not in overdrive......But I don't know how to fix that....have you changed your tranny fluid in a while and have you done a torque flush on it, b/c just dropping the pan changing fluid and filter only changes about 50% of your fluid, the torque flush fluses the fluid in the TC and both of those will change ALL MOST all of the fluid. Hope this helps. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 11, 2003 Report Share Posted January 11, 2003 Sorry for a third post but I did some research, on Trans-Go's website. -cmo1234 I did some research and found that you either have a 3T40 or a 4T60. If you have the 3T40, which is a 3 Speed, I assume that your 2800-3000 rpms at 70mph is right, if you have the 4T60, then it is wrong. The 3T40 has the following gear ratios, 1st is 2.84:1, 2nd is 1.600:1 and 3rd is 1.00:1 with no fourth obviously. Now, my 4 speed turns 3000rpm in 3rd which is 1.00:1 like yours at 70mph, so if you have the 3T40, then that is correct, this info should help you more, then what I said above. Quote Link to comment Share on other sites More sharing options...
90lumina3.1 Posted January 12, 2003 Report Share Posted January 12, 2003 i would just like to correct myself. my car does about 2250 at 80-85mph in OD. it seems that if you do have OD, then your car just isnt using it, and you should have that tranny looked at. Quote Link to comment Share on other sites More sharing options...
cmo1234 Posted January 12, 2003 Report Share Posted January 12, 2003 Everybody, Thanks for all the info. I believe I have the 3 speed 3T40 (or 125C according to the specs on the main pages of this site). I'll take a look at what the tranny pans says if anything. Also my selector on the car on has only one D on it, no overdrive D w/the circle around it. So I guess my RPMs are ok and the fluid is nice and rosy red, almost as red as my interior, lol. BTW got some 18% tints all the way around this past Thursday, pretty sweet, they keep out that hot ass FL sun. Next comes a new coat of paint to cover up the cracking paint (Oh Oh, better get Macco), and then some GTS light covers front and back. All this depends on how the $$$ situation is within the next few months. Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted January 12, 2003 Report Share Posted January 12, 2003 Anybody have numbers @ RPM speeds for a 1991 - 1994 DOHC with the 4T60-E? Just checking in to make sure I'm not running too hot myself... - RedFox340 Quote Link to comment Share on other sites More sharing options...
BlueCutSupreme Posted January 13, 2003 Report Share Posted January 13, 2003 wait, it sounds like you're sayin when u put it in D (without the circle around it) that's when the TC locks up and saves u gas...it's the other way, the D with the circle aorund it is more fuel efficient Quote Link to comment Share on other sites More sharing options...
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