high revs, myth or fact?
#27
Originally Posted by neit_jnf
I agree the program overly simplifies things in it's original form but you can build a custom power curve and have the program calculate the rest
also all the drivetrain, tire and aerodynamic losses can be changed.
Notice how the imaginary car can't go past ~162mph because it's power matches the losses? I'd think it is a very close aproximation for a stock FD.
I like playing with all the different parameters and see how the estimated ET and trap speed change.
#28
I run my car up to redline often but cruising around town I keep it around 2000-3000 rpm. No need to be cruising along in 2nd gear at 35mph. Revving it constantly increases engine wear and engine temp.
#29
I agree with most of you... revving it up constantly increases engine wear and engine temp... shortening the life of your engine. But then again, what fun is it shifting at 3k rpm anyways??? In short, rev it up every so often to give it some excercise...
#30
Originally Posted by RX 4 Speed
guys... just have a question for you all. I've heard both responses to whether or not it is actually good for our car's engine to be revved up when driving. Will the life of our engine actually LAST LONGER if it is revved up often? and if so, how often and how high? I mean, in spirited driving, I probably try to shift at 5k, but how often should I be doing this? 1x a week? 2x week? and how high for rpm's? I heard that the apex seals will actually get brittle and a big reason for them failing is because we "baby" our cars too much... which is true? thanks for the help.
IMO, running it hard when the engine is cold (I too watch for 180F water temp) is destructive. Driving hard regularly on a warmed engine will shorten the life of many components, but how much I don't know. Since heat from the turbos is the significant difference between the 13B-REW and it's shortened lifespan vs. the NA 13Bs that last for triple the mileage, I'd say running it hard (under boost) will shorten the engine life for certain.
Babying it completely isn't really bad as long as the car doesn't sit for long periods. It's not like our cars have valves to gunk up.
Dave
Last edited by dgeesaman; 09-13-04 at 11:34 AM.
#31
If I remember correctly:
According to the Mazda training video on the rotary engine, our power plant is designed so that high revs actually remove carbon deposits from the housing walls. I guess the real question is how high is high revs?
According to the Mazda training video on the rotary engine, our power plant is designed so that high revs actually remove carbon deposits from the housing walls. I guess the real question is how high is high revs?
#33
during normal driving, highest ill rev is 3500, i kinda have to cause the car has no low end torque since im non seq, i have to rev it that high to get moving even a little or to keep up with the pace..
but i try to hit 7500 at least twice once a week..most of the time i hit it twice all in the same trip..then i think im putting to much on her and i let her rest for more than 24 hours hahahahahahaha
hot damn, i treat this car like a bitch!! LOL
but i try to hit 7500 at least twice once a week..most of the time i hit it twice all in the same trip..then i think im putting to much on her and i let her rest for more than 24 hours hahahahahahaha
hot damn, i treat this car like a bitch!! LOL
#35
Jim has pointed out that shifting at a little over 7500 is going to give you the best performance. I agree. It appears that Mazda agrees too. That may be why they installed a buzzer to tell you to shift. If you are at WOT, by the time you shift after hearing the buzzer, you will have shifted at the optimal rpm.
It could also be that Mazda didn't want people to over rev the engine
It could also be that Mazda didn't want people to over rev the engine
#38
Originally Posted by TwinTriangles
Not if you've got a big race port...
Bottom line, if you're not making any more power, there's no reason to make the engine turn faster. High rpm puts more strain on the internals and accelerates wear. Find out what your power curve looks like and then calculate the proper shift points by finding the point at which maximum (peak) torque at the axles in the next higher gear exceeds torque at the axles in the current gear. It's as simple as that.
#40
I usually shift at about 4-5k rpm daily driving, but I do spirited driving every time I drive the car so it's common for me to reach 8k rpm at some point during a commute...plus I heard rotaries love to be revved!
#41
Originally Posted by Gargamel
you'll def be slower if you rev higher than the engine can flow. Running mine at the track, I can lose 3 mph going through the traps by shifting too late.
#42
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From: Florida
Originally Posted by Sled Driver
You have been watching too many Castrol oil commercials............
Let me see a show of hands of people who have "worn out" their engines??? Anyone????
OK, how about water/oil seals? Boy, I see a bunch of hands.......
Now apex seal due to ping'in, lean conditions??? All the rest of you.
Rev away my man, life is too short, like the quote above states, go for it.
If your concerned about wearing your engine out, you'll never use the car to it potential. (buy a civic)
Now if IM just repeating what everyone else said, sorry. I didn't waste my time reading every reply, just scaned the 1st page.
Let me see a show of hands of people who have "worn out" their engines??? Anyone????
OK, how about water/oil seals? Boy, I see a bunch of hands.......
Now apex seal due to ping'in, lean conditions??? All the rest of you.
Rev away my man, life is too short, like the quote above states, go for it.
If your concerned about wearing your engine out, you'll never use the car to it potential. (buy a civic)
Now if IM just repeating what everyone else said, sorry. I didn't waste my time reading every reply, just scaned the 1st page.
#43
Ok I got a related question that I've been wanting to ask for a while... is there anything bad/wrong w/ revving your engine high but slowly/without boosting? Ex., I find it's much easier to get a very smooth shift at 5000rpm and up, yet when the speed limit's 35, and 5-0 is around, I'm not exactly gonna come off the line boosting lol. That, and if I haven't had a chance to give her a good run, at least I'm revving her high enough to clean out some carbon deposits. So i have - on occassion - slowly raised the revvs to 5, 6, or even 7K rpm w/o really getting on the gas. The boost guage remains at 0mmHg, but I dunno if this is bad, since a) she remains at higher revvs for a longer period of time, and b) I know the 2nd turbo is fully spooled but not boosting, since it comes online by 4500 - 5000 rpm...I'm wondering if going past that w/o producing boost has any ill effects?
#44
Originally Posted by Gargamel
you'll def be slower if you rev higher than the engine can flow. Running mine at the track, I can lose 3 mph going through the traps by shifting too late.
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