PowerFC hand commander information

[nightSpirit]

It's great isn't it? apparently today when I went for a blat, my injector duty was 67.5%, revs were 7253 ( I bounced off rev limiter in second..it's over too quickly ), boost 1.45, water temp 82deg, speed 172km/h...and knock??? 38 or something? what's all that about?.

Also wired up the rogue systems engine lid fan kit to a switch on the dash! sorted.

[DannyW]

Flash git!

[nightSpirit]

lol!

So what does the knock thing mean? any ideas?...or is it related to flash gittedness?

[DannyW]

knock = detonation

there are certain levels that are safe though, need to speak to an expert really, not silly old me.

[nightSpirit]

yeah I know det is knock...but like you say, what is safe? what are other apexi FC users getting with the H/C? it might have been higher than that...not sure, also not sure if the fact it's a rev1 has anything to do with it...not being accurate or something.

Another cool thing is the km/h actually is accurate (the AVC-R I had a few years back connected to the MiNE'S ECU told me one day I'd cracked 320km/h)...so I can take it on the motorway and see what speed I'm at when it bounces off the limiter in 5th. My speedo only reads to 110mph and it's hard to guess how fast you're going when it just points at your feet.

[DannyW]

PM some fellow FC users, i know Mikejc has 1. also try nodalmighty because he knows his sh*t when it comes to stuff like this (im guessing he set yours up at thor?)

[Rowland]

lol!

So what does the knock thing mean? any ideas?...or is it related to flash gittedness?

Detonation or knock occurs after spark ignition. It happens because as the flame front progresses, the heat and pressure actually reform some of the molecules to a form that is easier to ignite, so they ignite causing multiple flame front.
You make the most power right on the verge of knock - hence having acceptable knock levels

I could attempt to explain in depth but I'd be far happier for you to get the experts opinion rather than mine!
Nod at Thor-Racing is probably your best bet to ask.

[Mikejc]

Knock Knock....

I can tell you that Thor seem to think that a knock value/level up to 60 is acceptable. It's after this point that the knock warning light will also start to flash on the dashboard, at which point you really should back off. This level has been passed on my own car a couple of times, between 70/80 has been seen! But i'm told this is nothing to lose any sleep over

As already mentioned a quick call to the chaps at Thor will give you all the info you could possibly need and more. Failing that I know JJ could also put you on the right track as I believe he knows his onions regarding the Power FC etc

Hope this helps a little

Mikejc

[LJS @ Rogue]

lol!

So what does the knock thing mean? any ideas?...or is it related to flash gittedness?

Detonation or knock occurs after spark ignition. It happens because as the flame front progresses, the heat and pressure actually reform some of the molecules to a form that is easier to ignite, so they ignite causing multiple flame front.
You make the most power right on the verge of knock - hence having acceptable knock levels

I could attempt to explain in depth but I'd be far happier for you to get the experts opinion rather than mine!
Nod at Thor-Racing is probably your best bet to ask.

Or Peter as he is the one who actually maps your cars

Knock is NOT Detonation.

Detonation is Pre Ignition which is auto ignition of the whole charge before the spark timing event. This is caused by Hot spots (plug electrode tips or sharp edges/burrs in the combustion area made by bad machine shops). Very bad, engine killer !!!

Knock is the sound made by the COLLISION of multiple flame fronts caused by various reasons some of which are still not fully understood. Not the best !!

Pinking is caused by too much advance at low rpm and high loads. It's the sound of the piston rattling in the bore as peak cylinder pressure occurs at or before TDC, where piston pin, connecting rod and crank angle are less than ideal. Mostly harmless!

To answer your question, 38 is nowt, 60 is the AFC limit for Engine light flash (we set this to 55 for extra safety margin) 60+ is knock, 100+ is engine melting det, but then a duff sensor can also fake these readings. For this reason we never use this feature to map the car we use det cans and (in the case of big power cars like yours a second pair or ears, usually mine, listening at the cam cover ). We then check any knock we think we heard against the Data Logic Det logger for a second/Third opinion. We then finally map the car on the road with the det cans for any regions of the map not accessed during dyno tuning (like backing off transients).

Nod.

[Andy Jones]

(the AVC-R I had a few years back connected to the MiNE'S ECU told me one day I'd cracked 320km/h)

Sweet... I apparently managed 293kmh (or mph as its been adjusted) on monday moving it 15 feet out of the garage

Also wired up the rogue systems engine lid fan kit to a switch on the dash! sorted.

Have you thought about wiring them up to come in at a certain temp? i was gonna look at this myself but Clive at RC said he'd wire them into the Apexi gauge controller to come on/off at set temps if i wanted so this is now on the to do list.

[Mikejc]

Well that just about covers that then =D>

Good man Mr Nod, and there I was thinking that I was the only geek scanning through the days chitta chatta at this time of night You've obviously got too much energy from having had a day off

Mikejc

[Driftlimits Performance]

so I can take it on the motorway and see what speed I'm at when it bounces off the limiter in 5th

If you've got the standard gearbox it'll be 172mph

[nightSpirit]

Cheers for that Nod! and everyone else

So that's ok then? gooooood...I like it when you say 'big power cars like yours' lol makes me all happy

What readings are other people getting?

And Andy, I thought I'd just wire em up for a switch so then I can control it myself, sat in traffic etc...

[stevecordiner]

so I can take it on the motorway and see what speed I'm at when it bounces off the limiter in 5th

If you've got the standard gearbox it'll be 172mph

If your on standard wheels and tyres lol

[LJS @ Rogue]

Well that just about covers that then =D>

Good man Mr Nod, and there I was thinking that I was the only geek scanning through the days chitta chatta at this time of night You've obviously got too much energy from having had a day off

Mikejc

Not really, lack of a life outside of cyberspace maybe ?

Nod.

[nightSpirit]

So Nod...

I took car out today, to check my knock figure...and on one run it reached 56, then 43, then 53, it's less than 60...but not by much

[Mikejc]

All is well then On the couple of occassions that my own car reached over 60 it was just after coming off the throttle. I'm sure Nod will be able to explain the reasons as to why a lot better than I can.......Nod?

Mikejc

[LJS @ Rogue]

All is well then On the couple of occassions that my own car reached over 60 it was just after coming off the throttle. I'm sure Nod will be able to explain the reasons as to why a lot better than I can.......Nod?

Mikejc

Quite simple really, The MR2 has quite high ignition advance in the area of the map which is only really accessed at high rpm under high vacuum conditions (i.e gear change), but the residual heat in the combustion chamber from the previous thrape results in a transient knock condition.

You can check this by watching the knock value and then seeing if it jumps up when you lift off. If this is not the case and its causing you any concern, we can plug the lap top in and go out for a road session with you with the det cans to make absolutley sure.

Nod.