Knock retard on FD

[iaint]

my mapper did ask what i wanted it set up for. i told him everthing except going pop. it was mapped (injectors maxing out @ top end) so boost was turned down to suit but even then my mapper said \'its ok for occassional bursts but nothing too prolonged\'.
on the drive home (3hr trip) it was ok in short burts but now i can\'t even do that without it \'bogging down\'.

That doesn\'t sound great!  Max (re:worx) generally maps the car to be very safe under normal conditions so under extremes there\'s plenty of safety in place.  I wouldn\'t expect a decent tuner to map that close to the edge and certainly not maxing out the injectors - there\'s no headroom left and that\'s asking for trouble.

Bogging down might be a problem with the plugs being fouled or spark not being strong enough under peak boost.  Change the plugs and leads as a first port of call.

Iain

[dre]

You could buy a J & S knock sensor if you are that worried about knock levels.

Norris do a new ECU which they swear by (I think its AED or something, not to sure) was contemplating getting one when my Apexi PFC died but wasn\'t sure if many rotary tuners would have the software or confidence to map it.

Costs £1000 and has the following features built in as standard:
Traction Control
Anit Lag
Launch Control
Knock retard

and a few others too.

Any tuners / vendors thoughts on this would be cool. Apparently they have been so impressed by it that they use to swear by Apexi but now on their drag car and high powered cars they say this new ECU is the way forward!!

[vxer]

You could buy a J & S knock sensor if you are that worried about knock levels.

The standard car has a knock sensor already, its just that the apexi doesn\'t retard based on the readings...

Norris do a new ECU which they swear by (I think its AED or something, not to sure) was contemplating getting one when my Apexi PFC died but wasn\'t sure if many rotary tuners would have the software or confidence to map it.

Sounds interesting, but £1000 is a little on the steep side...

Ta, Paul.

[iaint]

Norris do a new ECU which they swear by (I think its AED or something, not to sure) was contemplating getting one when my Apexi PFC died but wasn\'t sure if many rotary tuners would have the software or confidence to map it.

Very much doubt it has all the correct controls to manage the rotary though...

[rx7veilside]

i am dubious about the knock sensor and its readings..on newly rebuilt engine i have had spikes of 80-90 at idle and higher on lift off.i have ported engine and external wastegate and fueling system is totally uprated and running water injection.on wot i get low readings in the 20s but as stated on lift off and even revving when stationary some silly readings.the wire to the sensor is very thin and subject to 10yrs worth extreme heat.quite poss when dealing with such small voltages for problem to occur..on a impreza i had a knocklink
 and on rolling road no reading but tuner could hear the det.but those ecus have a retard facility and are very good.i am by no means an expert but if the mapper cant detect knock with datalog then its unlikely u have any.no reputable mapper will map to the point of det and then pull back by anything less than a safe margin.
thatsaid mine went pop due badly flowing secondary and hole in vac pipe feeding fuel pressure regulator.even then that was after 5 hard runs at high speed

[nikp]

You gotta remember that the knock sensor is just a micropohne - it could be picking up all sorts off sounds that it wasn\'t designed to expect.

[Ricco_04]

I ran my PFC on standard car and was getting silly readings - Like 148 when I lifted off the throttle - which would have ment bye bye engine if it was a true reading.  Had the sensor checked out only to be told out it was fine.

Kinda leaving me stood there thinking......well can\'t you fix what other noises it\'s picking up so I can have a proper reading!  :3Confused   I\'m not a fan of turning the reading off cause it picks up other noises.  I have the facility so I want to use it!  :Grrr