Took a mate out for a spin last night and....

[Oedipus Rex]

88% is fine. Like I say if you were getting the knock reading at low revs its nothing to do with your duty cycle

[davegttph1]

hmmm, still youve worried me now saying yours doesnt go over 30 and mines way off the mark. Something doesnt add up even though it seems fine?

[mattmaclennan]

It should be in a thousand pieces with knock like that. GET IT SORTED!

[rx7veilside]

as a quick fix dont know where it is located but the knock sensor cld be lose or faulty and this wld give these abnormal readings..if ur knock really was 150/160 then i think ur engine wld have gone

[Oedipus Rex]

hmmm, still youve worried me now saying yours doesnt go over 30 and mines way off the mark. Something doesnt add up even though it seems fine?

I wasn\'t saying everything is fine, just that your duty cycle is fine. Ocviously if you end up in limp mode there is a problem. However it may well not be related to those knock levels, which could just be a dodgy sensor, or could be a problem.


Pip\'ll know

[davegttph1]

as a quick fix dont know where it is located but the knock sensor cld be lose or faulty and this wld give these abnormal readings..if ur knock really was 150/160 then i think ur engine wld have gone

Yeah this sounds a little more believable... anyone know where the sensor is?

Im getting 33 on the knock sensor just from tickover.... I drove into work and didnt go over 40mph and didnt go over 3k revs... max knock was 137... surely its not pinking in these conditions and I certainly know if it was on full bost if it was that bad.

lets hope pip answers the phone then  :wiggle

[iaint]

Sounds more and more like a dodgy sensor.

[davegttph1]

yeah I\'ve had a search and found where its located, Im gonna go out at dinner and see if its connected properly or loose etc before I ring Pip, no need to bother him if its something I already suspect anyhow...

[zevans]

I thought injectors were like anything else in terms of capacity... if it gets to 70% you should worry, and if it gets to 85-90% they\'re probably not efficient any more. If they\'re running at 100% it\'s broke...

I\'d have a good look at fuelling and check you have a clean fuel filter and the pump\'s up to spec!

[Oedipus Rex]

I dunno Zevans, Pip told me that anything up to 85% was healthy, up to 90% was passable and over that start getting worried. We put mine on the dyno and even though my injectors were getting upto 92% at WOT and full revs, my A/F ratio was still well under 11.5 so I left it at that, happy I wasn\'t going to det.

[davegttph1]

What is Inj Duty then? I presumed it was how hard the Injectors were working... so if it was 100% then it mines they are working to their full capacity and if anything cant supply enough fuel.... 85% means they are pushing through 85% of fuel that theyre capable off?

no? I have a bl00dy manual for the PFC, might give it a read tonight when I finally get chance to sit down

[Oedipus Rex]

yes dave thats pretty much it. The point is the more of their capacity to inject they use, the less effecient they are. So you are more likely to start running lean the higher your injection duty is. By the time you hit 100% its a fair bet your ****ed.

[davegttph1]

ahh good, there are 2 other options on the PFC, Inj Ld and another, cant remember exactly what they are... any ideas what theyre for? think 1 shows a graph of the fuel curve or something along them lines...

[zevans]

Yup 100% means the injector is open as often as it can be and is flowing all of the rated capacity...  so I\'d still worry if it\'s anything over 80%, especially in this weather. If we get a cold snap you\'ll need more fuel and where\'s it going to come from? (Mind you, if Pip says 85% is OK, I\'m not going to argue with him  :god )

From a quick Google it looks like ignt ld, not Inj Ld, which is injection advance / retard and not related to fuel flow. OTOH if you\'re seeing mega retard this might be because you have det and the PFC is trying to stop it!