Rev limiter = a valuable thing!

[NEEMSTAR]

Originally Posted by Jack The Lad.

You are talking about the diesel Ed. ???

probably both but definitely petrol as evilowl is off the CTR owners forum

[Ed Case]

Talking about the R, but I imagine it's the same all round.

Also read somewhere that with a modded ECU and raised rev limit (say 8,800), its safer to go to 8,700 than hit the limiter at 8,400.

[hondatech]

fortuately the rev limiter as controlled by the ecu will cut the fuel & ignition but unfortuately it wont stop the engine from physically overevving or spinning faster than the redline ,the boffins at honda are aware of this & midway through production of the last civic type r they introduced an extra bit of software in the ecu that records a fault code if the engine has physically spun much faster than the redline.this results in valuable evidence when a warranty claims for a blown engines are submitted.The fault code tells them the engine has been overevved & because of this honda will not be paying for a replacement,so bear this in mind if you regularly bounce your engine on the rev limiter because it could end up being rather costly.

engine damage caused by an engine exceeding its maximum design limit is not a warrantable item. DTC 119-1

[Jack The Lad.]

Well, that's all of you boy or girl racers sorted then.
Is there nothing left in this world which is private.

[pcr]

This spyware in the car concerns me a little. It's your car, I wonder if it is actually legal to access that information without your permission ?
What a pity they didn't put the effort into making the rev limiter do what it is supposed to do, protect the engine.

[FWH]

Originally Posted by pcr

What a pity they didn't put the effort into making the rev limiter do what it is supposed to do, protect the engine.

If you down shift into 1st at 70 mph no software can save you. (Unless it could control the clutch).

[uncler]

Originally Posted by Ed Case

Here you go, courtesy of evilowl from CTRO:

Basically when you hit the limiter it puts a lot of strain on the engine and drivetrain. If you brush it now and again it won't cause any harm but over time, if you are hitting it a lot, the timing chain will be stretched and can even jump teeth which will eventually wreck the engine if not checked and adjusted.

Now I didn't know that... Well, obviously not a good idea to be bouncing around up there all the time anyway (I should point out I don't make a habit of this, it just happens once in a while), but I was under the impression that the limiter was a 'saving grace' of sorts. I'm going to be extra extra careful from now on, I don't want a crippled engine!

[pcr]

Does this apply to you ? I most definitely do not race the engine, 3500 rpm max normally. I did once however, get curious about the rev limiter and put my foot down in 2nd gear. So is it likely that this one activation of the rev limiter has voided the engine warranty, let's hope not.
Also, the rev limiter appears to be undocumented.

[hondatech]

just to clear the confusion that seems to be developing on this thread,hitting the rev limiter occasionally wont destroy your engine,the rev limiter will safeguard this ,what it the rev limiter wont do is phyisically stop the engine spinning past its maximum design speed ,which when this occurs a fault code will be stored in the ecu detailing the overspeed.which in the event of an engine failure will void any warranty claim

[pcr]

Thanks Hondatech, are you saying that if the engine goes into the red zone then the engine warranty is void ?

[FWH]

Originally Posted by pcr

Thanks Hondatech, are you saying that if the engine goes into the red zone then the engine warranty is void ?

It think it is more of a matter if you accidentally down shift to 1st instead of 3rd and mechanically push it to 20 000 rpm or something like that.

[Pottsy]

pcr - hondatech is really referring to abuse. Say you were on a track day, and selected the wrong gear in the heat of the moment (say 2nd instead of 4th) and the revs went briefly to 9500, and something in the engine broke. The high revs DTC will record this, and you will not be able to rely on Honda to pay for the driving error - naturally you'd have to pay for it yourself.

[Pottsy]

OK - so FWH & I are psychic simu-posters...

[FWH]

Originally Posted by Pottsy

OK - so FWH & I are psychic simu-posters...

[Ed Case]

Borrowed from CTRO and Hondata:


Hondata wrote:The JDM K20A has a 8600 rpm limiter, whilst the US K20A2 with the same internal parts has a 8100 rpm limiter, so we are comfortable increasing the rev limiter to 8600 or 8800 rpm. One important point is that hitting the rev limit places a lot of stress on the engine, no matter where the limiter is. It is better to rev to 8500 rpm than hit the limiter at 8100 rpm. Also do not hold the engine on the rev limiter if you miss a gear - I've seen more than one engine expire this way. Another factor with the rev limiter is that the early K20A & K20A2 engines had weaker dual intake valve springs. Honda upgraded these some time in 2002 to a single valve spring (supposedly from the S2000). Owners of the earlier engines should consider changing the valve springs if they race the car. You'll lose a little power doing this. Connecting rods are a point of debate at the moment. We know they can fail at 9500 rpm, so setting the rev limit below 9000 rpm seems like a good idea.

[fanaticrom]

Originally Posted by hlxbravo

2nd gear is usually the one that gets me "bouncing" off it.

I seem to be doing the same thing although I have the car for a year. When I am paying attention to make perfect shift it doesn't happen, but when I'm very concentrated at the things ahead I ussualy hit the limiter

[-=Stella Artois=-]

Originally Posted by NEEMSTAR

you need to perfect the art of changing at 7999 rpm

Or 8599 in some cases

[angie4m]

It also records the speed you were doing at the time if you over rev it. Which makes you wonder if it would record this data in the event of an accident?

[Juff]

Originally Posted by fanaticrom

I seem to be doing the same thing although I have the car for a year. When I am paying attention to make perfect shift it doesn't happen, but when I'm very concentrated at the things ahead I ussualy hit the limiter

Exactly..... I hit the limiter today, was focussing on the vw passat who thought he could outrun me from the inside...... In these cases its pretty hard to follow the rev indicator.......... 2 gear rocks ......

[NEEMSTAR]

Originally Posted by -=Stella Artois=-

Or 8599 in some cases

why do you have to keep teasing !

yes 8599 sooon please God