rev limiter

[S2 PTH]

umm, not really proud about saying this, but i found out that my clios rev limiter is lower wen the car is cold..!

was racing a zetec_s and found out that i had to change up at 4500rpm in each gear (up to 3rd!)

incidently, how do rev limiters work and why do they make that du-du-du noise wen u hit it?

-phil-

 

[Daz]

Probably to protect engine.. have a lower limiter when the engine is cold - I think 172s have something similar.

4500 is low tho..heh.

 

[S2 PTH]

yeh, well 1st was practically finished by the time my foot hit the floor completely!

 

[iPap]

Maybe you had the auto choke still on and thats why it was so low.

Im just guessing!

 

[Matt16v]

Mine goes 7,200rmp from start up mate, sounds fishy to me, its controlled by the ECU and will be the same in each gear if all is well.

The noise you describe is the ecu cutting power as it hits the limit.

Once it hits the limit it drops off and then powers again hitting the limit again, so on and so forth cousing the brum brum brum sound! Ideally you change up before that happens though!

And yes its to stop people from ragging the fek out of their cars and making the engine go bang!

Although my mates Nova SR (few years back, before any one starts) had a mechanical one that didnt work!

 

[Daz]

Matt, dont you have a Mk1 16v?

I know on Mk2 172s.. the limit is definetly lower when cold.. and once everything gets warm, the limit changes!

But yea.. limiter should be same in all gears..

 

[Matt16v]

Yeah, MK 1 16v - ST PTH didnt mention he had a MK 2?

Perhaps more modern cars have this but must say I never heard of it!

 

[S2 PTH]

hmm, thats not wot its like on my car. (1.4 16v 2004)

1st- 6000rpm

2nd- 6200rpm

3rd- 6800rpm

4th- 6800rpm

5th- mailto:7200rpm@126mph">7200rpm @126mph

 

[telford_mike]

The limiter is different in different gears on mine too. BUT NOT FOR LONG

 

[Brooky182]

BUT PLEASE TELL ME U WON??

 

[NIN-172]

I cant believe youve all thrashed your cars from cold.
Oh well I suppose I did it with my older cars.

& it used to be so easy to take the rev limiter off. Just taking the distributor cap off & putting a std rotor arm on.
God knows what u have to do now to turn it off.



& whats that "du-du-du noise". Something to do with the conga?



[Edited by NIN-172 on 01 May 2004 at 8:54pm]

 

[Lunner]

Just outa interest what is the rev limirter set at on the mk1 1.2?

Iver found that peak power is around 4000 rpm, and theta if i take iot up to 6, 6.5k, then change up it returns to arounf 4k in the next gear

 

[Dink]

Quote: Originally posted by S2 PTH on 30 April 2004


hmm, thats not wot its like on my car. (1.4 16v 2004)

1st- 6000rpm

2nd- 6200rpm

3rd- 6800rpm

4th- 6800rpm

5th- mailto:7200rpm@126mph">7200rpm @126mph

are these the limits on your car??

(cos if it is im not racing you again)

 

[S2 PTH]

yup, all true dink.

(the last one was made up tho......)

my m8 "rekons" hes done 130 downhill and it went off the rev limiter (as on the older ones they stop at 7 right?)...but im not sure if i believe it as mine seemed pretty much fully done at 123ish on the flat.

 

[Dink]

just wondering thats all cos mine stops at 6500 pritty much in every gear

although ive never got there in fifth

 

[S2 PTH]

hmm, nope ive def seen it near 7000 in 4th at about 105mph in germany (lol)

 

[wonders]

Hands up williams drivers who keeps hitting the limiter when your overtaking

 

[S2 PTH]

well funny u shud say that coz driving ben_hs williams1 i cudnt believe how quickly the limiter came around. 1st gear was a megre 1.5s long, or so it seemed!

 

[Dink]

there must be a different box in mine cos i crash in to the limiter in forth at 110

 

[BenR]

It makes that noise as the ECU cuts off the injectors till the rpm falls to a certain level.