How long before the engine blows?
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Which is the safest highest rpm can we bring our engine up to before it starts to blow?
those red region, is it safe to change gears within those region?
computer games and tv shows make it seem safe/possible to do so.. -
NO!!!
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u said it yrselfOriginally posted by zerocool85:computer games and tv shows make it seem safe/possible to do so.. -
so how do we actually know wats the limit we can push the cars to?Originally posted by bismarck:u said it yrself -
the red area... never push to there...Originally posted by zerocool85:so how do we actually know wats the limit we can push the cars to? -
change when the speed suit the next gear lor. y do u wan to drag gear lei? and also, travel at high rpm meaning burning more fuel. if u compare, travelling at 50km/h on gear 3 and gear 4. gear 4 rpm will be lower mah, which save u some fuel as compare to using gear 3 for 50km/hOriginally posted by zerocool85:so how do we actually know wats the limit we can push the cars to? -
after too long
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You try and then you tell us can? I also very interested to know...Originally posted by zerocool85:Which is the safest highest rpm can we bring our engine up to before it starts to blow?
those red region, is it safe to change gears within those region?
computer games and tv shows make it seem safe/possible to do so.. -
thanks for da sincerity..Originally posted by dansplace:You try and then you tell us can? I also very interested to know... -
i want to know in like racing situation ma.. how to drag and stuff. heheOriginally posted by ben0704:change when the speed suit the next gear lor. y do u wan to drag gear lei? and also, travel at high rpm meaning burning more fuel. if u compare, travelling at 50km/h on gear 3 and gear 4. gear 4 rpm will be lower mah, which save u some fuel as compare to using gear 3 for 50km/h
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now most new cars got rev cut....Originally posted by zerocool85:Which is the safest highest rpm can we bring our engine up to before it starts to blow?
those red region, is it safe to change gears within those region?
computer games and tv shows make it seem safe/possible to do so..
when it reach redline,it will remain constant...
but cant hold there too long or "Blown Engine"...
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frankly speaking, this thread is getting nowhere.
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well, from my personal experience (auto cars).. i think the rev limiter will force a change in gear b4 it reaches the red region.. but sometimes when it reaches b4 that region, i will release the accelerator abit because im afraid something bad might happen..
my friend drives a nissan sunny (manual).. he said that when he was at gear 5, the engine totally cut off.. car seem to be cruising at high speed with total silence from the engine.. he tried to down shift and engage gear 4 several times and after a moment, the engine came back to 'live'.. that was his experience from over rev (i don think right term to use)..
maybe u guys can share ur experiences too.. or perhaps answer the thread topic.. -
Think most of you are mistaken.
If you just want to know how high it can go before you change gear and not trave from Pasir Ris to Boon Lay. then it is safe to change in the red zone.
Honda and Toyota engines ( the slightly older generation) are well known to be bullet proof. As long as your car is not using forced induction to churn out more power, the engine can stay in the red zone without doing any significant damage to the engine.
Which is why some honda and toyota engines are further tune to be able to rev to higher limits.
a good example is the engine Bunta replaces in his AE86. That engine is a Black Top 20V 4AGE. The red line is at the 8000 mark.
however, TRD have taken that engine and retuned to be able to rev up to 11k.
hondas engines have been similarly retuned too. -
so wat if i always floor the accerlator until rpm 5 - 6 ??? will it cause any damage to my mitsubishi car ???
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generally cars today have a rev limiter to prevent u from overrevving the engine and damaging the car. but actually u should find the power n torque band for your car and shift within that range because it's the most efficient.Originally posted by zerocool85:Which is the safest highest rpm can we bring our engine up to before it starts to blow?
those red region, is it safe to change gears within those region?
computer games and tv shows make it seem safe/possible to do so.. -
well if u go a bit to red zone its ok..........but if u go rite untill limiter kick in then sure blow after a while...imagine how fast.....
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I think some kid here is going to think their toyota Echo can redline their engines w/o blowing anything. -
let them blow it once and they'll know.Originally posted by ronnie_2600:I think some kid here is going to think their toyota Echo can redline their engines w/o blowing anything. -
'Originally posted by mitgalant:so wat if i always floor the accerlator until rpm 5 - 6 ??? will it cause any damage to my mitsubishi car ???
I always do that to my korean make car. no prob wat. even in neutral position, or engaged. lolz. once a while need to clear carbon. -
damn, wish i'm there to take photo... will be a kodak moment...Originally posted by HENG@:let them blow it once and they'll know.
sec 1 - fast and furious look.
sec 2 - priceless look on the face. -
Go send your car for dyno testing and find out when your max horsepower come in. If lets say it come at 5000 rpm and your redline is 6500 rpm, no point dragging it to redline also wat.Originally posted by zerocool85:i want to know in like racing situation ma.. how to drag and stuff. hehe
If lets say the dip in horsepower after 5000 rpm is VERY SHARP, for e.g at 5000 rpm your car pushing 130 bhp, then after that drop sharply to 100bhp at 5500, then you shouldn't drag over 5000.
If the dip in horsepower is only very minimal, you might consider dragging higher a bit so that when you change gear, you are still within a good power band for the next gear (ie heading strongly towards your max power)
E.g.
4000 rpm : 105 bhp
4500 rpm : 120 bhp
5000 rpm : 130 bhp
5500 rpm : 125 bhp
6000 rpm : 100 bhp
Just as a example, lets say this fella racing his car. Max bhp is 130 at 5000 rpm. Lets assume when he change gear, it drops around 1000 rpm. So if he drag to 5000 rpm and change gear, it will drop to 4000 rpm the next gear. From 130 bhp drop to 105 then start to climb again. He fell out of the power band as his car make power at around 4500 rpm only.
If he changed his style and shifted at 5500 instead, although it drops to 125 bhp at 5500, he will land at 4500 rpm in the next gear which is 120 bhp and keeping within the power band.
This is just an extreme example. Actually got many diff arguments but this is what I gather. Pls correct me if I'm wrong.
Anyway, most cars have rev limiter, it should cut you off before the redline. For those modified civics (original redline is 8200 for the old DOHC VTECs), revving to 10,500 also engine should be able to tahan. Highest I've seen is 12,000 rpm but after that engine got problem.
But of coz dragging 1st and mebe 2nd gear to 10,500 is "OK", but if higher gear revving to 10,500, engine may not tahan cuz it stays there much longer. 1st and 2nd is 'fast-fast job'. Rev there, change gear. 3rd still bearable. Later gears take so long to climb that your engine may not tahan revving so long at such high rpms. -
are you talking about the max torque/rpm and the max power figures stated in specs sheets?Originally posted by guitarman1:Go send your car for dyno testing and find out when your max horsepower come in. If lets say it come at 5000 rpm and your redline is 6500 rpm, no point dragging it to redline also wat.
If lets say the dip in horsepower after 5000 rpm is VERY SHARP, for e.g at 5000 rpm your car pushing 130 bhp, then after that drop sharply to 100bhp at 5500, then you shouldn't drag over 5000.
If the dip in horsepower is only very minimal, you might consider dragging higher a bit so that when you change gear, you are still within a good power band for the next gear (ie heading strongly towards your max power)
E.g.
4000 rpm : 105 bhp
4500 rpm : 120 bhp
5000 rpm : 130 bhp
5500 rpm : 125 bhp
6000 rpm : 100 bhp -
yes he is.Originally posted by ronnie_2600:are you talking about the max torque/rpm and the max power figures stated in specs sheets? -
how do you calculate bhp then?Originally posted by HENG@:yes he is.
i vaguely remember is something like bhp = maxtorgue / 5252? or something like htat?
maybe my calculation is wrong. coz my 1.6L car will be having like 70bhp.