just had tek3 done and there is the odd little spike on my knock link at just short of 7000rpm and do you think octane boosters would take this away, am waiting to fit water injection so the spike isnt a problem, does anyone else in the modded cars suffer from similar spike

 

It could just be picking up other engine noise..??

Millers or NF are pretty good and most people seem to swear by NF..

Dan

 

yeah mate, i got mine mapped on optimax and noticed the odd spike.

i use 1 mil per litre of NF and it is totally quiet now.

 

jonny are you going to help fit on mine mate

 

I thought a tek3 was a custom map?

 

It was a custom map, it was for headers and 3 port, but Steve was under serious pressure of time and this problem literally appeared at the 11th hour during final testing and he was falling asleep on me and had to get back to his family (he says he never drives his car at those RPM usually and so we don't know if his Tek 2 did it before but with the headers it was pulling out -4 and getting sparkly on arrival at only 0.9 bar).

It was quite a hot day and still hot late in the evening, and only running PPP sort of boost profile at the top end (I don't go mad after peak power) where the knocklink was lighting up sporadically (two greens at high RPM as expected then flicking to big red on occasions but unpredictably). Adding fuel (although it wasn't lean) and retarding timing just could not get rid of it, and I ended up at pretty standard ignition timing and boost up there but the glitch was still present. Det cans would have been useful, but the only setup I've found I can hear anything with is tapping into the knocklink wires with the laptop and headphones but there was no time.

I didn't want to keep retarding timing and throwing fuel in with little effect so Steve was going to fit the water to see if it improved things (although I think it should be mapped specifically to the water he wanted to just add it for safety).

One possibility is that the low octane ignition map was being accessed, but no one it seems knows when this map is used by the ECU and therefore on the Tek 2 (and PPP) it is usually left pretty much alone and can oddly be more advanced than the base map. Most development I've done has been with the low and high octane maps set the same for paranoia and I think this might help here.

Certainly a splash of NF in the tank would be interesting to see if it can get rid of the sparkle. It is only ever a single short lived flash, but a very odd RPM point for it to occur especially with the virtually standard mapping up there just before the rev limiter.

I'm not happy that I sent a car away with a flashing knocklink near the rev limiter, but the behaviour was odd and we had no time to sort it last night.

 

Probably an external rattle like the heat shield vibrating or something similar that the knocklink is picking up. There was a fellow on here which I helped in diagnosing a similar problem and it turned out that one of the bolts holding the heatsield was missing causing vibration which was being picked up by the Knocklink. Once he fitted another bolt to it, the Knocklink went quiet.

Cheers,

George.

 

steve- i wouldn't bother fitting the W/I

i lost 8 bhp on the rollers at well lane with it on!!!

i am now going to sell mine and buy something els.