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  1. #1
    jey
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    Removing Rev Limiter From My A4???

    Anyone know how to remove or override the rev limiter on a b6 a4 saloon 2.0 fsi???

    very annoying! have to change gear b4 it hits the red or cuts out!

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  3. #2
    evilscotsman's Avatar
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    are you serious mate? the rev limiter is there to stop you blowing up the engine!

    It should just hover at the redline - some cars have a smooth-cut limiter that just holds or bounces the revs at the limit, some cut the fuel so you have to release the throttle and change up to get power again. Unless its faulty I would leave it alone unless you want to shell out 3 grand for a new motor.

    If you really want to you can get the limit removed by having the ecu reflashed but if the timing belt or some other part lets go at full pelt you'll be picking up your engine with a shovel.
    B4 TDI - old skool project / daily driver...if it ain't broke, it's probably an Audi...


  4. #3
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    Quote Originally Posted by jey View Post
    Anyone know how to remove or override the rev limiter on a b6 a4 saloon 2.0 fsi???

    very annoying! have to change gear b4 it hits the red or cuts out!
    Why would you want to keep revving it to the redline anyway,much better to change a bit earlier.

  5. #4
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    No there is a lot of hidden power beyond 6,000 revs the rev limiter is purely there to stop you going really fast. Only really good drivers know this!
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  6. #5
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    LOL - yeah and adding stripes up the side or over the bonnet makes you go even faster!

    For information tho, look at the dyno map from any car, the power falls off sharply before the upper rev limit is reached, ours may rev to 6.5k rpm at the redline, but power drops off from 5800 onward anyway!

    The reason is one of energy conservation from newtons third law of motion.....the flywheel builds excessive centrifugal forces at high rpms, this starts to reduce the power, since power is torque x angular velocity (rpm is just angular velocity expressed in revs per minute instead of radians - simply rotational speed of a disc)

    so it would initially seem that increasing rpm would give increasing power, all the way to infinity.....except that centrifugal forces increase in log fashion and above a certain rpm they become quickly massive, causing the forces generated to act radially on the flywheel (toward the outside rim at 90 degrees to the axis of rotation) instead of acting in a circular motion in the direction of rotation, and start reducing shaft horse power at the same rate as the centrifugal forces increase.

    Thats why increasing rpms doesnt work beyond a limit determined by the engine torque output and the rotating mass of the flywheel.

    Think about this:

    Bike engines, tiny flywheel, low torque, high rpms before centrifugal forces act.

    diesel engines, large heavy flywheel, massive torque, low rpms.

    petrol car engines....in between
    Last edited by evilscotsman; 15th October 2008 at 10:31.
    B4 TDI - old skool project / daily driver...if it ain't broke, it's probably an Audi...


  7. #6
    J7USS's Avatar
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    evil, you make me laugh mate!very good info though.Dont think id dare get into a debate with you,lol!

  8. #7
    evilscotsman's Avatar
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    hehe all part of the service LOL
    B4 TDI - old skool project / daily driver...if it ain't broke, it's probably an Audi...


  9. #8
    jey
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    my limiter cuts the fuel! in my opinion i have more power left in each gear then i get cut of! near go through the windscreen wen fuel cuts out! lol

    the bouncing limiter described b4 wud be better!!

  10. #9
    evilscotsman's Avatar
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    mate you dont have more power left since the power drops off like a stone at 6500 rpm!!! Look at the following dyno plot for the 03 1.8T:



    As you can see the torque also drops away LONG before that. You DON'T have ANY MORE power to get - you are imagining it. I guess its your dad's car too since no one would buy an expensive luxury car then try to rev the ****** off it past the redline....?

    LOL
    B4 TDI - old skool project / daily driver...if it ain't broke, it's probably an Audi...


  11. #10
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    LOL at go fast stripes

  12. #11
    jey
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    Quote Originally Posted by evilscotsman View Post
    mate you dont have more power left since the power drops off like a stone at 6500 rpm!!! Look at the following dyno plot for the 03 1.8T:



    As you can see the torque also drops away LONG before that. You DON'T have ANY MORE power to get - you are imagining it. I guess its your dad's car too since no one would buy an expensive luxury car then try to rev the ****** off it past the redline....?

    LOL
    my dads car!! could get cheeky at that comment m8 but ill bite my tongue!

    its my car and yes i luv reving the **** outa it rite past the red! i own it so can rev it smash it or burn the ****in thing if i wanted to!

    the car is gaining speed rite into the red b4 cutting out! seein is beliving!

    i appricate ur reply in detail but i can see my speedo and whats happenin...

  13. #12
    Broken Byzan's Avatar
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    It will obviously continue to gain speed when you are redlining it, but i bet it will accelerate quicker in a higher gear. However if you are able to change the laws of physics etc, get the car chipped, it will have a little more power and probably a raised rev limit, but it will cost you a min of 250.

    My car now has a rev limit of 7200, but i never use it since the useful power has dropped off nearly a 1000 revs before that and i would have changed up

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    Do you get charged by the letter? Cut the ****ing knobhead txt speak, and stop trying to get your poor car to do things it quite obviosuly can't. If there was a way to remove the limiter, you would quite simply have blown up your engine by now. Revs do NOT = speed or power, get used to it or better still get a remap.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
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  15. #14
    quattrojames's Avatar
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    Quote Originally Posted by AndyMac View Post
    Revs do NOT = speed or power, get used to it or better still get a remap.
    Or a Type R....
    Ingolstance Read about my A6 HERE.

  16. #15
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    Quote Originally Posted by jey View Post
    my dads car!! could get cheeky at that comment m8 but ill bite my tongue!

    its my car and yes i luv reving the **** outa it rite past the red! i own it so can rev it smash it or burn the ****in thing if i wanted to!

    the car is gaining speed rite into the red b4 cutting out! seein is beliving!

    i appricate ur reply in detail but i can see my speedo and whats happenin...
    Ok mate, nuff said on the subject. Its not going anywhere and when you asked the question I just pointed out the pointless-ness, you can indeed blow it up or whatever you like, as you say, it is yours to do with as you please.

    B4 TDI - old skool project / daily driver...if it ain't broke, it's probably an Audi...


  17. #16
    jey
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    Quote Originally Posted by AndyMac View Post
    Do you get charged by the letter? Cut the ****ing knobhead txt speak, and stop trying to get your poor car to do things it quite obviosuly can't. If there was a way to remove the limiter, you would quite simply have blown up your engine by now. Revs do NOT = speed or power, get used to it or better still get a remap.
    knobhead! wasnt doin any name callin at anyone so watch ur mouth son!

    its the fact thecar dies wen hittin the limiter, id like the option to change gear wen i want not wen the car decides...

    wat wud a remap acheave for a 2.0 fsi 150bh engine??

    always thought remaps only worked well for turbo'd cars??

  18. #17
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    Wasn't name calling, just referring to the style of typing and I'm thankfully not your son.
    What don't you understand about "your engine will destroy itself"?
    I'd also bypass all the fuses in your house so you can get more power from the mains!
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  19. #18
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    LOL Andy!!




    Cheers,
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  20. #19
    J7USS's Avatar
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    Quote Originally Posted by AndyMac View Post
    I'd also bypass all the fuses in your house so you can get more power from the mains!

  21. #20
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    Quote Originally Posted by jey View Post
    its the fact thecar dies wen hittin the limiter, id like the option to change gear wen i want not wen the car decides...
    The car will die when it hits the limiter to protect the engine internals from self destructing. There is absolutely nothing to be gained from reving higher, as showed by Evil's dyno plot earlier in the thread. The only possible outcome that can happen from removing the rev limiter is that you will, and you WILL trust us, eventually blow your engine. I'm sure thats not what you want.
    Ingolstance Read about my A6 HERE.

  22. #21
    jey
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    Quote Originally Posted by quattrojames View Post
    The car will die when it hits the limiter to protect the engine internals from self destructing. There is absolutely nothing to be gained from reving higher, as showed by Evil's dyno plot earlier in the thread. The only possible outcome that can happen from removing the rev limiter is that you will, and you WILL trust us, eventually blow your engine. I'm sure thats not what you want.

    no dont want that! jus dont like how it cuts out, means ive to look at rev counter b4 changing gear! not the handiest at speed wiv eyes on the road!

    andy!! bypassin all the fuses in ur house doesnt gain u more power mate! but u do talk some ****e! son...

  23. #22
    Broken Byzan's Avatar
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    A remap can gain a few BHP on a NA car usualy gain a slightly higher revlimt and a smoother pickup.
    Turbo cars have the best results from remapping, but certainly an NA car can benefit.

    On another subject, you shouldnt need to look at the rev counter, surley you are able to tell what the engine is revving at and whether its stopped pulling etc.I know i can.

    Any chance of a video of this 20 fsi engine that pulls up the red line? before this turns into a slanging match as i am intruiged !

  24. #23
    IT CANT RAIN ALL THE TIME

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    Quite frankly I think he's talkin out of his ass!!! Its obvious he cant drive properly.
    Audi A4 2.0 sport, My mind is telling me no, but my body, my body is telling me yes!

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    Quote Originally Posted by jey View Post
    andy!! bypassin all the fuses in ur house doesnt gain u more power mate! but u do talk some ****e! son...
    I talk shyte and you're the one who can't hear when to change gear and has to look at the rev counter. I really don't think you should be driving anymore dad! Nurse? He's out of bed again!
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
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  26. #25
    "Stick a V8 in it!"

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    The power drops off due to the cam profile causing the engines VE to drop because the valve isnt open long enough to fill the cylinder, or in a turbocharged engine, the turbo running out of flow capacity to maintain boost pressure. Its nothing to do with the flywheel or centrifugal forces. You cant increase the valve opening time on a stock engine becuase a) it wouldnt idle or pass emissions, and b) your pistons would hit the valves.

    If you revved it any higher than the stock limiter on a standard cam profile, the valves would be open for a shorter and shorter time as the revs rose and simply wouldnt be able to take in enough air. If your not half stoned or braindead when driving you can feel this power drop as the car approaches the rev limiter, and that tells you when to change gear. Even if you do overshoot it and hit the limiter, you should have already be expecting it to happen (because you can hear and feel it) and have been just about to shift anyway, therefore the loss of power is irrelevant.

    Hondas rev to 9k and still make power because they have a VTEC system which switches cam profile as the revs rise to allow the engine to breath at the higher revs, not to mention the conrods, pistons and crank are all designed to spin at that speed.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  27. #26
    jey
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    Quote Originally Posted by HAWKEYE View Post
    Quite frankly I think he's talkin out of his ass!!! Its obvious he cant drive properly.
    think u talk outa ur ass, can smell ur **** breath from here spunk bucket!

    1st gear reved to near 6500 revs then i changed up at the 6500 i think i felt it flattin out as described, 2nd gear reved to 7000 didnt feel it flattin out an changed up b4 limiter kicked in, road wasnt long enough for 3rd, was really only 1st an 2nd i was interested in!!

    was in my bro's sti sub an most cars jus feel dead as f**k now! think thats y i want more outa my revs to lol

  28. #27
    IT CANT RAIN ALL THE TIME

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    Quote Originally Posted by jey View Post
    think u talk outa ur ass, can smell ur **** breath from here spunk bucket!

    1st gear reved to near 6500 revs then i changed up at the 6500 i think i felt it flattin out as described, 2nd gear reved to 7000 didnt feel it flattin out an changed up b4 limiter kicked in, road wasnt long enough for 3rd, was really only 1st an 2nd i was interested in!!

    was in my bro's sti sub an most cars jus feel dead as f**k now! think thats y i want more outa my revs to lol
    Its a shame i cant slap you sensible! If you wanted a car that revved to 10,000 revs why did you not just buy one, did you not test drive it before you bought it???? Even so as already said banging it up to the limiter says you really REALLY REALLY dont know how to drive
    Audi A4 2.0 sport, My mind is telling me no, but my body, my body is telling me yes!

  29. #28
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    I've never raced a car, but I've spent a lot of time racing motorcross / supercross bikes at a good level. These bikes don't have rev counters however, as the guys say above you know from the sound of the engine when the optimum time is to change gear - you really shouldn't need a rev counter to watch. If you do need to watch the rev counter to gauge when to change I would suggest you spend a little more time behind the wheel before you start driving at high speeds.

    Also, rev counters are not put in to limit the cars performance, they are put in to limit the damage done to the engine by OVER reving it.

    Trust me, all the guys on this site are really knowledgeable, they ALL want to help any of us out with our problems so lets just 'cool-it' as I have a hunch you maybe back with another post later in the year you want some advice on..
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  30. #29
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    Quote Originally Posted by jey View Post
    think u talk outa ur ass, can smell ur **** breath from here spunk bucket!

    1st gear reved to near 6500 revs then i changed up at the 6500 i think i felt it flattin out as described, 2nd gear reved to 7000 didnt feel it flattin out an changed up b4 limiter kicked in, road wasnt long enough for 3rd, was really only 1st an 2nd i was interested in!!

    was in my bro's sti sub an most cars jus feel dead as f**k now! think thats y i want more outa my revs to lol

    Dont even worry about what revs you are changing gear,change gear as soon as you feel the torque falling and the car will be faster.

  31. #30
    2000 a4 1.8tqs-yellow

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    if you want a car that will rev buy a jap car with variable valve timing.

  32. #31
    jey
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    i no how to drive! i also grew up wiv motocross bikes so hav plenty of experience on wen a gear has reached its limit and how an engine should sound!

  33. #32
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    Quote Originally Posted by jey View Post
    i no how to drive! i also grew up wiv motocross bikes so hav plenty of experience on wen a gear has reached its limit and how an engine should sound!
    So why dont you do that then and stop asking stupid questions about removing rev limiters.Some people havent got the brains they was born with.

  34. #33
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    Don't think he had much to start with. He can't spell, can't type and can't drive. My 5 year old has a better grasp of both English and how an internal combustion engine works.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  35. #34
    jey
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    Quote Originally Posted by AndyMac View Post
    Don't think he had much to start with. He can't spell, can't type and can't drive. My 5 year old has a better grasp of both English and how an internal combustion engine works.
    My mouth is going to get me in trouble
    Last edited by FactionOne; 19th October 2008 at 14:09.

  36. #35
    jey
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    Quote Originally Posted by james0808 View Post
    So why dont you do that then and stop asking stupid questions about removing rev limiters.Some people havent got the brains they was born with.
    No really, it will...
    Last edited by FactionOne; 19th October 2008 at 14:09.

  37. #36
    bubstar's Avatar
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    A4 Avant S-Line quattro - Avus Silver/Silver Half Leather *240ps*346nm* - a few choice mods. Now Stared up ;-)

  38. #37
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    Quote Originally Posted by AndyMac View Post
    What don't you understand about "your engine will destroy itself"?
    I'd also bypass all the fuses in your house so you can get more power from the mains!
    lol i cant stop laughing but totally agree with what ur saying,

    jey, wouldnt have thought that removing the limiter would give extra power, mates got a 2.0 fsi and it couldnt catch a cold after 6000rpm, yours is probally a one off limited edition which revs to mars and back!

    oh hold on a min ive got it, have you got......

    hks
    peco,
    cobra,
    ripspeed,
    kumho tyres

    down your doors in that style? if you have thats why its faster because ive heard you get 10bhp per sticker, i bet youve even got led washer jets on it ;-)

    give urself a pat on the back for probally pi55ing a fair few good people off on the site
    A3 Quattro... Nothing else compares...Apart from my new 1.8se lol


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  39. #38
    james0808's Avatar
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    Quote Originally Posted by jey View Post
    ur a ****** too, sorry to leave u out in the last post!!

    You should be sorry too,ignorant peasant.

    Now run along and go redline your painfully slow 150 bhp heavy car and imagne its fast.Just use your mirrors when you do as there might be an old dear in a metro or micra waiting to overtake you.[IMG]http://i55.photobucket.com/albums/g134/james0808/Smilies/****er1.gif[/IMG]

    I like it when morons like jey come on here.I know you shouldnt laugh at the mentally challenged but i just cant help myself sometimes.
    Last edited by FactionOne; 19th October 2008 at 14:11.

  40. #39
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    Pissing us off? On the contrary, this is hilarious.
    I'm assuming it's a wind up as no one could possibly be that much of a brain dead, illiterate moron, but very entertaining non the less!
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  41. #40
    Broken Byzan's Avatar
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    ^^ I agree ^^
    I thought on the whole Audi drivers were more sensible.This post has shown me otherwise.

    Obviously Audis are now classified in the same league as Paxos and 106's etc.
    Its a sad day..

 

 
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