Hi, just a quick question, i have a Power fc and commander, im just wondering what the knock reading should roughly be around on a rotary. Just for piece of mind tbh :)
Thanks
depends on a few things mate, loose things in the engine bay will affect it because it will think its knock.
im running a stock downpipe and cat, driving around in vacuum i normally get between 30-38, had it up to 79 on a flat out run to redline.
i did put my foot down to the floor in 5th at 1500rpm to see at what rpm my first turbo hit full boost, knock went to 118 and heat light come on, never been that high before and dont know if it was the circumstances of loads of boost at low rpm or just something rattled setting it off.
what sort of readings are you getting?
i booted it today and went to 111 (why i asked), but usually it is around 30\'s - 40 might go up to 50/60s if im doing a bit of fast roading.
well 111 is way to high in my opinion, if it happens again maybe pull a bit of timing out, do you know roughly what rpm it was when it happened?
i didnt check, but it was whilst showing off, i however dont ever remember in the past it being that high before, and rest of journey home it never got near that
to be honest... I reglarly see 100 + when I view the knock!! But like said above, it could be some mettal to mettal contact with something, a loose nut rettling or even something stupid like a turbo about to spit the dumby, or even a nakerd sensor! you just can\'t tell, which is why alot of people don\'t bother looking!
The other thing is, once the knock sensor has picked it up, the damage is done... similar to the stock water temp gauge!
Jono
well keep an eye on it, when you see it go up look at what rpm it is, if its around 5000-6000 then you need to pull some timing, if its when your not pulling big revs etc then probably something loose in the engine bay
You can get knock at low rpm i\'ve had it at about 2500 rpm turned out to be a gap in the map. Unless you know your knock sensor is broken it\'s worth investigating.
been driving my rx every day for 5 years and see 100+ all the time and engine not blown yet.
old knock sensor in the car is notoriously poor, mine was reading way high, reworx just disabled it in the pfc settings - if the map is safe, ignore it.
My dump valve sets mine off, as does tyre roar, exhaust noise and a whole host of other things!!
Pip set up my map and told me to just ignore it because (and i\'m paraphrasing here) "if it was that high you\'d be picking bits of tips off the Moon"
Thanks guys, feel alot better now! :)
If you have ANY aftermarket exhaust or downpipe or a slightly dodgy engine mount or even a loose engine bay bolt can cause this to go crazy. A waste of a sensor imo.
how do you go about reading the knock sensor?
if you have a power fc it will show it on the hand commander
Quote from: leefitz;672042how do you go about reading the knock sensor?
Quote from: turbotoaster;672047if you have a power fc it will show it on the hand commander
If you have a hand commander it will show you the readings. If you don\'t, but still have the PFC, the red "HEAT" light on the dash will flash 3 times in quick succession to show that the sensor is picking up the sound of knock. However, like with the water temperature gauge, by the time you know about it the damage is already done!
When the front of my engine disintegrated, the knock readings where 17 max so it cant be relied on.
My knock value is mostly in the 20-50 range, but sometimes goes up to 100+ when second turbo kicks in.
I had a knock one time of 160 when on idle and turning on the lights (the popups) ;)
Quote from: AndersE;672681My knock value is mostly in the 20-50 range, but sometimes goes up to 100+ when second turbo kicks in.
I had a knock one time of 160 when on idle and turning on the lights (the popups) ;)
is the car mapped? id be concerned if it goes over 100 on the second turbo as thats where peak torque is
Yes it\'s mapped by garabedian racing (G-R.se) in sweden (check his rx7 on youtube 899Hp fd).
It happens just sometimes, just in the transition between turbo 1 and 2.
Quote from: turbotoaster;672683is the car mapped? id be concerned if it goes over 100 on the second turbo as thats where peak torque is
:Yawn So would you be more concerned for me then, mine is disconnected and is not used...
\'highly modded over 400?\' :rolleyes:
dont be a plonker!!
i asked if his car was mapped, if it was and he was always getting over 100 then we can assume its just a bad sensor, if not then its worth looking into.
You should never ignore a sensor until you know its defo reading wrong, else theres no point in it being there.
Im running on a basemap and if i got over 100 while in boost i wouldnt be continuing to floor it....would you?
Sorry I forgot you are the 200 mph guy....... on a budget!
Apoligizes....
whats that meant to mean, just because i have a budget to work to suddenly my opinion is worth nothing, the guy after i asked said that it had been mapped, so then he will be fine to ignore it.
I shall make the assumption that you are genuinely apologising because i cannot see for one reason why just because you ignore the knock sensor its fine for everyone else to...unless its already mapped like i previously asked
to be fair, if he regularly saw 100+ as the 2nd turbo was kicking in, and it was genuine knock, he\'d prob be in the wanted section looking for a new engine
Quote from: Jit;673258to be fair, if he regularly saw 100+ as the 2nd turbo was kicking in, and it was genuine knock, he\'d prob be in the wanted section looking for a new engine
^^this ;) ;)