[Euro] free reving the engine

[25yko]

hey all just a quick quiz i was at the traffic lights waiting for them to go green so while i'm waiting a decided to rev the engine and to my amazement the i couldn't rev pass 4.5rpm why is this i have a manual so i'm a bit confused

[ngupil]

Euros got rev limiter, which means that you can not rev pass certain rpm whether you are driving or idling. As far as i remember from past threads, i think the euro limits the rev to 6500 or 7000 rpm when you're driving, and 4500 or 5000 rpm when you are idle

[Ferrarista]

Yep, rev limiter. GT4 Style :D

[EuroAccord13]

Rev limiter at Stationary is - 4500RPM
Rev Limit while car is in motion is - 7400RPM


Question Answered.. :)

25yko, I will close this thread when you acknowledge and have nothing else to ask :)

CHEERS

[yfin]

Rev Limit while car is in motion is - 7400RPM


Yep - it seems to rev cut between 7300 and 7550. I was a bit surprised the first time I saw the RSM show 7550 as the peak revs reached (and no - I wasn't downshifting - upshifting). I rarely hit the cut - but on the odd occassion the revs rise faster than I expect and I am caught out :rolleyes:

[kam]

Rev limiter at Stationary is - 4500RPM
Rev Limit while car is in motion is - 7400RPM


Question Answered.. :)

25yko, I will close this thread when you acknowledge and have nothing else to ask :)

CHEERS


why are you so quick to close the thread? thats the whole point of posting on the forum. what about if people want to add in their opinions and comments? :rolleyes:

[Delta_One]

Is there a list of cars that have this?

With the model and year?

[albii]

why are you so quick to close the thread? thats the whole point of posting on the forum. what about if people want to add in their opinions and comments? :rolleyes:
exactly....the post count has been taken away now so its not about boosting your post count....let the ppl talk...
btw..i didnt know this feature existed..i wonder if you turned the vsa off if it would still function?

[msnealo]

As far as I know nearly all EFI cars built in the 90's and beyond have a rev limiter. The euro is the first I've heard of in having a limiter that's lower when in neutral.

I like the feature in the new M3 BMW. The redline changes according to engine temperature. When you start the engine the redline is 4000rpm and as the engine heats up it slowly climbs to 7800rpm or there abouts.

[Ferrarista]

why are you so quick to close the thread? thats the whole point of posting on the forum. what about if people want to add in their opinions and comments? :rolleyes:

I totally agree, threads around this place are closed waaaay to quickly.

[msnealo]

why are you so quick to close the thread? thats the whole point of posting on the forum. what about if people want to add in their opinions and comments? :rolleyes:


Another one in agreement here. Why close a thread unless it breaks the forum rules. It only encourages people to start new thread.

Speaking of new threads.............we might have to start a new thread on thread closures!

[madjace]

well said we could also talk about thread movements

[yfin]

Please start a thread in the site discussion section - not here. Euroaccord13 asked a valid question in accordance with moderator rules as to when a question has been answered. As for thread movement - that is also in accordance with forum rules. The accord forum is more for technical questions and discussion - not chit chat like a thread saying "I was involved in an accident today", etc, etc.

[Delta_One]

Does this mean my 93 Accord EXi Auto has a rev limiter???

OR does this only apply to Manuals?

Cheers

[stephen8512]

wouldnt know about 93 accords.......
but i was told taht free revving a car to,say, redline isnt really healthy for the engine or the car? someone care to back up this statement? like im sure if a rev limiter has been put on the euro, theres gotta be some reason why honda did it in the first place....

[accordoholic]

Does this mean my 93 Accord EXi Auto has a rev limiter???

OR does this only apply to Manuals?

Most cars ( don't know any that doesn't ) have a rev limiter aka cut-off point. And your '93 Accord has a rev limiter in the red zone between 7000-7500rpm, and there is no separate rev limiter while stationary.

Driving the car into the redline area can be bad but may not be as bad as people say if you well maintain your car. Trust me, I drove my previous '92 for 285000kms from brand new and it still runs well when I traded it for the euro.

[EuroAccord13]

why are you so quick to close the thread? thats the whole point of posting on the forum. what about if people want to add in their opinions and comments? :rolleyes:


2 Reasons why I want to close this thread...

http://www.ozhonda.com/forum/showthread.php?t=17472

http://www.ozhonda.com/forum/showthread.php?t=8429


The search function in this forum isn't something that is there as an aesthetic feature... it actually works.....

[ngupil]

wouldnt know about 93 accords.......
but i was told taht free revving a car to,say, redline isnt really healthy for the engine or the car? someone care to back up this statement? like im sure if a rev limiter has been put on the euro, theres gotta be some reason why honda did it in the first place....

I still dont get it why people likes to free revving their car. I think free revving, especially in the traffic light like those some commodore drivers oftenly do, is just bloody annoying.

In term of rev limiter, it is placed to prevent your engine being blown even its free revving. I think Honda guys put lower rev limiter in neutral because they assume that people will free revving when they heating up their car. High rev limiter will cause the engine to heat up pretty quick which can be bad for the engines, because the metal that made the engine will change its properties when heat up too quick if its done often.

[yfin]

In term of rev limiter, it is placed to prevent your engine being blown even its free revving. I think Honda guys put lower rev limiter in neutral because they assume that people will free revving when they heating up their car. High rev limiter will cause the engine to heat up pretty quick which can be bad for the engines, because the metal that made the engine will change its properties when heat up too quick if its done often.

I think of more concern to Honda would be people reving to 7000rpm and then dumping the clutch. If someone wanted to do this all you need to do is get the car moving at 1kph - then there is no 4500rpm limit.

(I haven't tried such a clutch dump by the way - not a good idea if you value your car). The Evos have a similar mechanism to protect the clutch.

[aaronng]

In my opinion, the lowered rev limit in neutral is because of the Euro's long stroke. When you are in neutral, the rate of the revs climbing and coming back down is much quicker than when there is load. Hence the piston's acceleration would be much greater than for a car with a normal stroke length and would put more stress on the internals and cylinder walls.

[yfin]

In my opinion, the lowered rev limit in neutral is because of the Euro's long stroke. When you are in neutral, the rate of the revs climbing and coming back down is much quicker than when there is load. Hence the piston's acceleration would be much greater than for a car with a normal stroke length and would put more stress on the internals and cylinder walls.

Aaronng - do you think it is then not wise to rev match above 4500rpm?

When downshifting I double clutch and rev match in neutral. This can require a rev match above 4500rpm.

[aaronng]

Aaronng - do you think it is then not wise to rev match above 4500rpm?

When downshifting I double clutch and rev match in neutral. This can require a rev match above 4500rpm.
That was my opinion, of course it can be wrong. But during a revmatch, I don't really floor the accelerator for a substantial duration. Do you? I only use a full throttle stab or a 1/2 throttle push. (push being longer than stab)

BTW, I think that the K20a integras also cut off at a lower RPM at neutral. So my theory on the longer stroke probably does not hold water. But I still stand behind my "no load revving is bad" theory. The rate of acceleration of the pistons is much larger with no load. And it's also interesting that the RPM cut out is at 4500rpm, which is the rpm where peak torque is generated. Anyone have info on the significance of this?

[yfin]

But during a revmatch, I don't really floor the accelerator for a substantial duration. Do you? I only use a full throttle stab or a 1/2 throttle push. (push being longer than stab)

Yeah, short duration. Not sure if it is a push or stab - whatever it takes to get the revs where I want. Not held there for long so I doubt it is a problem.

[25yko]

Rev limiter at Stationary is - 4500RPM
Rev Limit while car is in motion is - 7400RPM


Question Answered.. :)

25yko, I will close this thread when you acknowledge and have nothing else to ask :)

CHEERS
i'm done

[Chris_F]

hmmm... does that mean a lightweight flyhwheel wouldn't be the best idea for the long jeopardy of the engine?

[Sulley]

izzit good to free rev the engine to warm it up?
i do it certain morning, just hold it ard 2-3krpm and let the engine warm up..

[aaronng]

hmmm... does that mean a lightweight flyhwheel wouldn't be the best idea for the long jeopardy of the engine?
If you don't excessively rev the car in neutral, I guess....

[aaronng]

izzit good to free rev the engine to warm it up?
i do it certain morning, just hold it ard 2-3krpm and let the engine warm up..
Free revving is more like hitting the accelerator heavily and letting the revs go up to the upper range. You know, GT4 style. haha. But in the morning, I think 2k is ok, since the ECU does rev it to about 1.5k on its own on cold mornings if you don't touch the accelerator. But I'd rather let the ECU do the warm up for about 1 minute, and then start driving off with light throttle and revs below 3000rpm. The K24 warms up very quickly after that.

[ngupil]

i normally warm my car up until the engine its really heated up. i think reving your car and just drive off without heating up your car had the same effect. only that if you warm up your car, you couldnt do high revs.

[eurotrash]

I know in late model falcons the engine restricts the amount of water/coolant passing through the engine - thus allowing the engine to warm up quicker. Does the euro have this feature?

[msnealo]

I know in late model falcons the engine restricts the amount of water/coolant passing through the engine - thus allowing the engine to warm up quicker. Does the euro have this feature?

That would be called the thermostat. It's in all cars. It doesn't open till about 90 degrees, until then the coolant is just circulating through the engine. Once it hit's 90 the thermostat opens and start to send it through the radiator to cool it down.