hard rev limiter?

[gsfent]

I have been driving my new to me '04 MT car hard for the last 150 miles to help clean out some of the carbon deposits (about 8 gallons of fuel and 12 oz of high concentrate Techron). Definite improvement in smoothness on acceleration, especially light throttle when the car is on the verge of adding IMA. Eventually, I expect I will have to clean out the EGR.

The car pulls pretty strongly past 3k and at 4-4.5k seems to kick in a little extra (VTEC or equivalent?). The Owners Manual says 6k rpm limit, and I have gotten close, but I am being careful not to exceed the rev limit.

If I hit the rev limit, will the car dial back fuel, timing or both to prevent on overrev on acceleration? My other cars have "hard" rev limiters which prevent you from exceeding it on an upshift. I don't want to chance floating the valves, or worse, so instead of trying it out, I thought I would tap the collective wisdom here first to see if I have a "hard" limiter.

Regards,
Jerry

[satchel]

Your tibialis anterior muscle.

[Fl_Fyr_Fytr]

Originally Posted by satchel

Your tibialis anterior muscle.

I admit, I had to look it up... lmao

[Cobb]

Most cars have 2. THe hard one is when the springs bounce or flutter. THe soft one is the ecu rather it cuts fuel or fire.

Not sure you need to continue unless you want to blow out the rings and bearings too. Usually a good 0-60 run will do. May want to look into seafoam.

[gsfent]

Originally Posted by Fl_Fyr_Fytr

I admit, I had to look it up... lmao

I didn't look it up, but given it was a body part, I was understanding the answer to my question was "no", the rev limit is controlled by the right foot (or whatever the anterior whatsis connects to!)

Cobb

I use different definitions for a hard limiter. To me that is one that cuts out at a certain rpm and there is no doubt. A soft limiter is one that allows you to just stay on it, with the motor just pulling a little fuel or timing, but you don't get the "I felt like someone shut off the motor" feeling. Bouncing the valves is not what I would call a rev limiter, I call that more of a busted engine about to happen! . And while I am guessing Honda is probably conservative with its redline by at least a couple of hundred rpm, I have no desire to be the test case! LOL

As to cleaning runs, I think running the car in 2nd and 3rd at WOT is less wear and tear than taking off from a dead stop. That puts a big strain on the clutch among other things. WOT from a roll puts a load on the car, which is what helps clean up the insides.

And the insight is a gutsy performer at over 4k rpm; as long as you hold it in gear, it is a lot faster than you would think.

As a side note, after the first hundred miles of "normal" city driving and 200 miles of "clean the cob webs out driving", I am getting ONLY 44 mpg. Just got to love this car!!

Regards,
Jerry

[jonnyvtec]

I hit the limiter in mine a few times.

I used to have a noisy Integra, so accelerating at 65 in 2nd. I wasnt used to
a) being in 2nd, not 3rd
b) the lower rpm
c) the lack of noise!

Doesnt really concern me tbh. Honda's know how to rev and its good to blow the cobwebs away from time to time.

[gsfent]

Originally Posted by jonnyvtec

I hit the limiter in mine a few times.

.

OK, so you are saying there is a hard limiter which you can't go past? Not sure how accurate the tach is, so where is the hard limit? 6000, 6100, 6200?
Thanks.
Regards,
Jerry

[jonnyvtec]

Yeah its a hard limiter as such. It will stop the engine going past that rev point. Its around 6200 I would guess.

[gsfent]

Originally Posted by jonnyvtec

Yeah its a hard limiter as such. It will stop the engine going past that rev point. Its around 6200 I would guess.

Thanks, I will check it out so I know with a lot less trepidation. Good to hear that Honda did build in that protection for upshifts.
Regards,
Jerry

[Lighterisbetter]

Actually there is not a hard limiter. You can mechanically over - rev and destroy the motor. There is a soft limiter that uses a fuel cut-off. For most applications the soft limiter is fine. The issue is if you down shift into too low of a gear and mechanically over-rev the engine. The fuel cut - off does nothing for this and you can hurt something.