Rev Limitter Problem

[Kaido_RR]

Hi,

I'm having problems with my rev limit. I was driving my car hit limitter and i got the normal bang bang bang, and holding at 7300rpm, i then happen to hit the rev limit, again and then i got a very odd sounding bruuuu bruuuu (or baaaaaaaa) and the limit doesn't hold at 7300rpm it just keeps increasing but very slowly,

I went into the pfc h/c to see if my rev limit had been increased but it was still 7300rpm, i try to dropping it to 7000rpm to see if it made a difference but i still get the same result.

The best way i can describe what it is doing, is on a bee-r rev limitter you can set the gain of how fast/slow the limitter acts, its like something has set the limiter to a very low gain and it can't stop the engine from increasing the rev

I'm very worry because i was just driving the car and then all the sudden it just change the car still drives fine boost fine etc etc

my car is r33 rb25det, mods hks turbo, injectors, fuel pump etc etc 251rwkw

thanks michael

[paulr33]

whats the actual problem? the rev limit isnt a hardset cut, its a soft cut so its possible to bounce past it a little, ie if the rev limit is 7300rpm you can goto 7301rpm for example, probably up past 7600rpm if you bounce off it hard enough

[Kaido_RR]

whats the actual problem? the rev limit isnt a hardset cut, its a soft cut so its possible to bounce past it a little, ie if the rev limit is 7300rpm you can goto 7301rpm for example, probably up past 7600rpm if you bounce off it hard enough

the sound and characteristic of the limiter have changed, the limiter now sound something like you would get in a holden, which before it was like a machine gun bang bang bang,

and its not like its bouncing off the limiter, its like it hit the limit then the rpm slows down and increases slowly,

edit, i will go drop the limiter down to 4000rpm and take a vid as that may better explain the problem

[fr0st]

Don't most rev limiters retard the timing as a soft limiter then remove fuel as a hard limit?

Could be that, I don't know enough about the powerFC to know what type of limiter it uses

[The Mafia]

is it a powerfc PRO or normal version?

Post what your hand controller says on startup.

[blind_elk]

Doctor, it hurts when I do this...

Stop bouncing it off the limiter!!!!!!!!!!!

[mad082]

the bang bang bang sounds as though it was retarding the timing, or cutting the spark, and the bang was the fuel igniting in the exhaust. what you have now is probably removing the fuel, which is better for your turbo. the sound you have now is what the limiter on the stock ecu sounds like.

[Kaido_RR]

is it a powerfc PRO or normal version?

Post what your hand controller says on startup.

normal powerfc version.

h/c says:

Powerfc ver 5.11

[Kaido_RR]

the bang bang bang sounds as though it was retarding the timing, or cutting the spark, and the bang was the fuel igniting in the exhaust. what you have now is probably removing the fuel, which is better for your turbo. the sound you have now is what the limiter on the stock ecu sounds like.

nope its not that,

this limiter doesnt sound anything like what the stock ecu limiter sounded like.

like i mention i was driving the car, hit limiter sounded normal (bang bang bang), then about 1-2min later i hit limiter again and it sounded completely different and the rpm keep gaining not bouncing like it normal does

[Kaido_RR]

ok

went and try the limiter just then, it looks like its now bouncing like it normal does but still something doesn't sound right

at 3500rpm it sounds all sick but at 7300rpm its starting to sound normal, but still something doesn't sound right

here are the links to the vids

now i listen to the vids again, the 7300rpm sounds about right, maybe something random happen yesterday when i was driving to course the odd sounding limitter and now it has fix itself

[SECURITY]

sounds like ignition cut rather than a fuel cut.

factory = fuel cut

most other aftermarket computers = ignition cut (because its safer)

ill put up a vid of what my car sounds like with the ignition cut @ 3500 and 7000 for you to compare if you like.

[Kaido_RR]

sounds like ignition cut rather than a fuel cut.

factory = fuel cut

most other aftermarket computers = ignition cut (because its safer)

ill put up a vid of what my car sounds like with the ignition cut @ 3500 and 7000 for you to compare if you like.

that would be great

thanks

[johndanyal]

Did you ever figure out what was causing this issue for you? My rb is doing the exact same thing. It used to bounce off the limiter, now it just goes brrrrrrrr and loses power

[Hadouken]

Maybe you broke something bouncing off Li iter

[johndanyal]

The engine wouldn't redline when I first got it running and then after a while it worked and now it stopped again

[Simon-S14]

missfire?

[johndanyal]

It's almost as if it's cutting ignition but not fuel. Everytime I try to hit the limiter it will bog and then let out a nice big flame from the exhaust

[Simon-S14]

misfire for sure... stop thrashing it before you break something

[Sinista32]

misfire for sure... stop thrashing it before you break something

seems one is born every seven yrs looking at first post to the revival

Plse god clean the gene pool

[XGTRX]

Best thing to do is go and buy an oil pump.. you will be needing it soon