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High RPMs
Posted: February 26th, 2006, 8:51 pm
by Danny
Ok, so I'm driving in 1st, I shift at 3K, and my RPMs go to 2250~, and same for 2nd, 3rd, and 4th. And when it does it in 4th, that means at 3K RPM in 5th, I'm sittin at 64 MPH.... I mean, I thought shifting into 5th was supposed to significantly drop your RPMs, like 2K~, not 600. I mean, when I get on the highway, and I'm going about 70 MPH, it sounds like my engine is about to blow up its revving so high, I mean, I cringe whenever I go any speed above 70 (note, I'm not specifically talking about 70MPH, I'm just saying that once I get going at high MPH its at very high RPM). In my old civic (it was auto...if that matters), I would get up to 100 MPH on the highway and it wouldn't even phase me.
Is something wrong with my car, or is it just me?
BTW, I do have a POS exhaust, its like all rusted and corroted, there's also a big ol hole in my cat. My friends grandpa said that replacing it would help, he said something about back pressure...any ideas?
Posted: February 26th, 2006, 10:25 pm
by SBmx3
when did the problem start? has it always been like that?
Posted: February 26th, 2006, 11:01 pm
by atlantamx3
You can thank the lovely engineers at Mazda for the gearing ratios on your tranny.
Its normal for MX-3's to rev high like that, even in 5th gear at highway speeds.
Sucks, doesnt it?
Posted: February 27th, 2006, 10:35 am
by Danny
SBmx3 wrote:when did the problem start? has it always been like that?
Yeah, its been like that every since I got it, in like October/November.
You can thank the lovely engineers at Mazda for the gearing ratios on your tranny.
Its normal for MX-3's to rev high like that, even in 5th gear at highway speeds.
Sucks, doesnt it?
Soooo.....basically I'm screwed.....and there's nothin I can do about it.....
Posted: February 27th, 2006, 3:42 pm
by Bochek
correct, there are 2 reasons why they do this...
These motors will run for longer at these rpm's (less of a load on the engine) and they are more fuel efficiant at right around 3k pushing little load compared to 2k pushing more of a load.
Bochek
Posted: February 27th, 2006, 5:23 pm
by Tunes67
These motors will run for longer at these rpm's (less of a load on the engine) and they are more fuel efficiant at right around 3k pushing little load compared to 2k pushing more of a load.
Thats a nifty theory
Except the engines in our cars are pulling loads and not pushing them LOL
Tunes67
Posted: February 27th, 2006, 5:27 pm
by Bochek
Tunes67 wrote:These motors will run for longer at these rpm's (less of a load on the engine) and they are more fuel efficiant at right around 3k pushing little load compared to 2k pushing more of a load.
Thats a nifty theory
Except the engines in our cars are pulling loads and not pushing them LOL
Tunes67
Stupid FWD
Posted: February 27th, 2006, 6:10 pm
by D323
Actually you can do something about it.
Go to a junk yard and get the 5th gear from a DX protege... its a lower gear and you will see a more significant drop in the RPM's.
Posted: February 27th, 2006, 6:34 pm
by Bochek
D323 wrote:Actually you can do something about it.
Go to a junk yard and get the 5th gear from a DX protege... its a lower gear and you will see a more significant drop in the RPM's.
not that great of a drop.. the difference is the protege dx does 3k at 120km/h and ours dose 3k @ ~105kmph
Woo!
Bochek
Posted: February 27th, 2006, 6:56 pm
by DJGypsy
i think the ratios are fine the way they are, but a 6th gear would be great for higher freeway speeds. most freeways down here in FL have the limit posted to be 70. of course nobody is doing under 75. a 6th gear would be great for this to keep the engine around 3-3.5k as opposed to 4k+.
Posted: February 27th, 2006, 7:11 pm
by Danny
Bochek wrote:D323 wrote:Actually you can do something about it.
Go to a junk yard and get the 5th gear from a DX protege... its a lower gear and you will see a more significant drop in the RPM's.
not that great of a drop.. the difference is the protege dx does 3k at 120km/h and ours dose 3k @ ~105kmph
Woo!
Bochek
Wait, how many MPH is 105 KMPH?
Oh, and if I do an engine swap, will that effect it at all?
Posted: February 27th, 2006, 8:47 pm
by Bochek
65mph for your american people.
and no a engine swap wont make a difference. None. at all. But your car might be faster.
Bochek
Posted: February 27th, 2006, 9:45 pm
by Danny
Posted: March 2nd, 2006, 12:59 pm
by corbanbrook
Would it be possible to upgrade to a 6-speed? or would that be costing to much money for it to be worth it.
Posted: March 3rd, 2006, 12:36 am
by Devilhog
Is there a 6 speed that will actualy bolt up to our engines?
Anyways at 70mph my car is doing 3200 rpms. I dont see much of a problem with that.
You guys need to start driving the car, not baby'ing them. Have fun take it above 5000 every once and a while
And to those who dont baby their cars, cya on the road
Got my Stock 96 1.6l Dohc up to 210 kph. Cant wait to see it once I get some work into the engine.
