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Your speed/ rpm readings are accurate - you will iht 20mph at ~4500 rpm, there's no clutch problem. So what you're trying to say is that it hits the rev limiter at 4500 rpm??? If you are, that sound like your computer has a program for an automatic transmission vehicle, but I really doubt that has happened. Will it rev higher in the other gears? Can you get it past 4500 rpm???


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Originally posted by mmarfan:
So what you're trying to say is that it hits the rev limiter at 4500 rpm??? If you are, that sound like your computer has a program for an automatic transmission vehicle, but I really doubt that has happened. Will it rev higher in the other gears? Can you get it past 4500 rpm???




The rev limiter that you speak of is in Park. I have not been there yet, but I think the automatics have the same rev limiter, while driving, as the MTX. Around 7000 RPM. Like I said, I have never been there, but feel it to be true. If our rev limiters kicked in at 4500, there would be no use for the secondaries since they at around 4000 +/- 250 RPM.


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No, the revs don't get limited, the speed is just maxed out. I hit 25mph at 4k Revs, but that's it. I can sit on the gas to about 6.0k revs and still be at 25mph !! and 2nd takes me all the way up to 30mph now (I reset the computer and gained 5mph).
From about 2.5k revs upwards, the engine revs increase but the speed barely notches up 5mph, all the way to 6+ k revs.
With this how it is at the moment, I am getting smoked by things like cavaliers and escorts, I can't keep up with anything leaving the lights, the traffic behind me is honking as I'm flooring it in 1st and 2nd to get up to 30mph cruising.
I just don't have the acceleration or speed that I used to have.

Could it be the secondaries, I wondered that before, which is why I posted here. Although I would still expect a little more accelleration even if they weren't opening.

Last edited by Rabbit; 01/26/03 03:09 PM.

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Dang this is a hard one. Is your check engine light on? Is it flashing? Where do you live at? Mabee someone local can come and look at it. Have you taken it to a mechanic yet to see what he says?


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Chart of gear ratio and speed at redline:

Transaxle: MTX-75
Final drive: 4.06:1
Gear Ratio Speed (mph)
1st: 3.42 35
2nd: 2.14 56
3rd: 1.45 82

If you are at 6750 rpm and NOT going close (within speedo error) to this speed then:
A) your clutch is slipping
B) your speedo is whacked

No way around it - loss of power can not alter your engine rpm to speed ratio as it's fixed by the gearing.


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My guess - it sounds like you've got a miss in the ignition. Even though the car was serviced before you picked it up, check the plugs and wires anyway - it's possible they weren't touched in the service, or that there may be a bad one (it happens).

Scott


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Originally posted by Pigeon:
My guess - it sounds like you've got a miss in the ignition. Even though the car was serviced before you picked it up, check the plugs and wires anyway - it's possible they weren't touched in the service, or that there may be a bad one (it happens).

Scott




The above could be true, but even if it missed fired, your RPM's and speed would still be equal. And you wouldn't be able to reach your max RPM(fast atleast).

See with a bad wires, or plugs, your rpms and speed will still match, but you won;thave the power out put to reach your full potential and possibly your full RPM, but since your reaching your max rpm and not speed (assuming it sounds like your reaching you highest rpm) it is something else.
I say you might have a bad speedo....or maybe your flywheel could be damaged by the snow and salt covered roads.


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I dont care HOW bad a speedo is, I can tell if I am hauling ass, or not! (which may or may not be the case, in this particular post, but still.. food for thought..
I don't think a partially defective speedo would make all the other gears still equal, and correct, as he seems to state in his previous posts..


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Well.....took it to the dealer.
On my way down there the "rattling" noise became a knocking.
Told them when I got there, guy said it didn't sound like a clutch because no over-revving.
Jumped in and went for a drive, hooned it round the little country roads....or at least tried to
The knocking got worse, but I could feel the secondaries a lot more now.
We went back to the dealership and he told me it sounded like there could be water in the gas, lowering the octane, causing the knocking sound which had just occurred. Run a bottle of water remover through and fill up on higher octane for a few tanks. If it persisted then to bring it back.
He mentioned too that the incorrect ignition could lower my hp for revs.

I threw in a bottle of STP water remover, filled up on 91 and it's definitely feeling better. The knocking is really dying down a lot now, nearly gone today. The HP is feeling better for the revs and she's driving more like she used to. I'm still not entirely happy yet, but it's a great improvement, and I only did this all yesterday too.

On a side note, I always check the pump before I fill, and wipe snow/ice off if I see any .... but .... I did lend the car to my wifes ex-husband (long long long story), and he put in a little less than 1/4 tank. Could be something happened there. I also had just run a bottle of Motomaster "premium, all-singing, all-dancing, so good it makes you coffee in the morning" cleaner through the tank, and the tech guy told me this could have contributed somehow to the problem, although would not be the cause.

I also reset the computer too before hand, that really made a difference in second. Totally unbelievable, I went from hitting 6K revs at 30~35mph to ~50mph. Definitely fits in with the ratio ScottK put in here. No idea why that could be, but it sure did make a big big difference.
Also have to quickly mention that the Check Engine Light never came on once.

Ahh well, it seems a bit better now, and $5 instead of $1,500 is much easier on my pocket. I just hope it really does fix it. I'm going to get the plugs and wires checked sometime soon too. Not something I'd do myself, I know enough but wouldn't dare tinker !! LOL I'm a coward when it comes to fixing cars.

Thanks for the great replies, be sure I'll post again if this doesn't fix the problem.

Rabbit.


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Originally posted by Rabbit:
it's winter an d there's been a fair bit of snow up here so I've been driving pretty conservatively and have been shifting from 1st to 2nd when I hit about 2.0 to 2.5 K revs because of this. However, yesterday I was on some pretty good roads, and tried to take off from the stop sign a bit likely. I was in first gear and between 4.0 to 4.5 K revs I was still only at about 20mph !!




Hey Rabbit, don't mean to oversimplify this at all, but it sure sounds like you hit a patch of black ice. The situation you described happens to me everyday on Calgary roads. Are you very accustomed to the feel of driving on ice?


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