Hi guys, After an ecu diagnostic I got the dreaded 34. I checked the resistance on both sides of the detonation sensor plug and the problem lies on the Detonation sensor side, somewhere. I'm thinking of using the resistor to fool the ECU. I have a modified chip that can handle boost upto 17 pounds and have boosted to 15 pounds at the moment using the appropriate boost jets. Question is, has anyone here used the resistor while running 15 pound boost and still has an engine in one piece. - is this a bad idea? I'm thinking if the chip is made to handle 17 pounds boost then there should be no problem as I'm not maxing out it out. PS, I also checked the O2 sensors and they are fine. Any ideas? Peter
Replace it. I know it's a bastard of a job plennum off. And they're expensive really considering they fail so easy. Resistor only a temp fix. 15PSI and effectively no det sensor is pushing your luck. Though I'm a conservative really go one size bigger on your boost jets till it's fixed... resistor fine but not more then about 12PSI. (especially summer) Bad luck, but plenty of other maintainance things you can do with plennum off.
well, I run 19 psi on a bypassed det sensor and my engine is still in one piece.you will find that the detonation sensor is ignored at high rpm anyhow. its only there to help with detonation under load when the boost is coming in.the reason its ignored at high rpm is that there is a lot of other noises happening at high revs which would set the sensor off anyhow.all cars are set up this way, so dont feel hard done by
The same here, bypassed my det sensor died long ago. im running 15psi boost and no problems todate. just never ever run streight ULP and you will be fine stick to optimax etc. when the det sensor was working i never hit safety mode (after detonation) once. only time i can recall was after i had to run normal ulp out in the sticks as the servo didnt stok premium and i need juice BAD.for infos sake, the computer stops monitoring for detination at 3600 after that your on ya own anyways. as for boost over 15psi your mad if you go beyond that with stock injectors 15psi @ 7000rpm your injectors are already over 80% duty cycle, injector manufactures dont recomend this. 17psi and beyond , keep ya wallet handy your set for major problems. ever seen what happens to an engine that leans out. also note that the efficancy of the stock turbos is shiot to the $hit boost > 15psi basicly just creating little extra power and mobs more heat.enough babble.:>< madmacka
Top information guys, I will use the resistor for now.15 pounds sounds like peanuts though compare to 19!I never floor the accelerator from a standing start anyway as I know the exceess pressure put on the whole car is just not good in general. Also, I always use Optimax or BP equivalent. I guess the other comforting factor is that the chip will handle upto 17 pounds boost as it has been modified to cater for this everyday.Honestly, I don't see any dramas in using the resistor.More inormation just came in from my chip supplier. He has confirmed that the engine will handle 15 pounds without any reason for concern. He also aknowledged that failure of the detenation sensor is a very common problem and he too has the resistor mod on his 300TT. Guys, the excitement...
Also, check the plugs I can't believe the number of times I've seen the det sensor and VVT plugs reversed. Do a search for det sensor plugs for the details. See Ya, Garry
I checked the VVT plugs just in case and did not see anything out of the ordinary.Besides, the detonation sensor wiring looks something like a coaxial cable. I did some work on this a while ago and repaired it to its former glory and now I find out that all my effort in repairing it was a complete waste of time.Peter
I installed the detonation sensor resistor Today I installed the detonation sensor bypass resistor and took the car for a drive.I WAS SPEACHLESSThe difference is like day & night.The Z a supercar. I have never driven anything like it.From 60km/h I planted it and the wheels started spining on the spot!!!!One thing I did notice though each time I went into hyperdrive, there was a cloud of smoke left behind. Is this normal?
Thing is though... The det sensor does serve a purpose... and it's when you're cruising along up a hill under load when the sensor will pick up any pinging. Doubt you'll hear it with your ear. So I'm conservative but if an injector starts stuffing up on that hot day or you get a shocking batch of fuel or even someone gapped your plugs wrong... it's some degree of pre warning to beware. Cheers,
not unless its off your tyres.... smoke can be caused by a number of things non of wich are a good thing.reasons for smoke can be a number of things.turbo(s) on their way out. valve guide seals. rings.just to name a few common reasonsbest have yur mechanic check it out and get a compression test done at the same time handy to know exactly how heathy your engine is.oh BTW black smoke can be caused from running to rich but id hardly discribe what it leaves behind a cloud.chears :-Z
1st time may have been the tyres but second & third time I deliberately did not want to spin them so the acceleration was with full grip.I have rebuilt turbos with 360deg thrust bearing and high flowed so I doubt they are on the way out. They are 6 mths old and always have been running in safety boost.Valve stem seals - possibly, but I don't have the classic symptoms of smoke after standing for a long/short periods of time or even during driving for that matter. I have planted it before i boosted it in safety mode on a number of occasions and never had this smoke thing. Rich under full boost, perhaps.It is diffucult to look at the colour of the smoke because by the time you have a chance to look back after hitting warp it is clearing, it doesn't hang around for long.I will drive it for a week and let the computer adjust to the new conditions and gradually workup the warp speed again and see what happens and will take it from there.I'm thinking of doing a dyno run to determine HP. Can this smoke thing be picked up then? - during a dyno run.Peter
Mine did this. When it first came from Japan everytime I gave it a full boost blast it would blow some crap out the back. New exhaust and it completely disappeared. *shrugs* now I don't even get those lil black particles of dusty soot on the back just monitor it and make sure to run pemium fuel (Optimax, Synergy or Ultimate) Probably just crud in your exhaust, a lil rich maybe... or even those tyres melting. Get someone behind to check out the colour, bet it looks worse on cold nights with car lights behind you too. Cheers,
I got on to the chip supplier again and he said that it sounds that it may be running rich under load and recommended to perform the following: - Unplug one of the battery terminals and let to sit for approx. 2 hrs. - This will reset the ECU and allow it to forget its memory.- Drive it for a few days normally, without hitting warp boost.- Check to see if the timing is at 15º. ie. as per factory setting for a TT Automatic. Not sure though if this 15º is TDC or BTDC. CAN ANYONE CONFIRM WHAT IS NORMAL? Which notch beginning from the left is 15º. I'll do this as soon as I learn which knotch 15º is on the harmonic balancer/underdrive pulley. Just to make sure the timing has not been fiddled with previously.I will follow the recommendation above and will take it easy and then take it from there - my honest feeling is that it is detonation but only for an extremely short time at the point of full boost. It may be exhaust junk but having mucked around with my previous boosted to the sh/ouse CA18DET I think the symptoms are the same (overboosting/too lean or rich). I also feel that the detonation sensor has a purpose below 3K as per comments made on this thread.I'll keep you posted of the progress until I have this wrapped up. I must admit though, the ease of failure of the det'n sensor is a joke, especially given it's criticality in the scheme of things.Peter
Latest update It ended up being fouled plugs because I had driven the car daily for a week while in safety boost and with upgraded chip and boost jets. This combination is not good for the plugs.I cleaned all the plugs as well as carbon deposits in coil packs and am now enjoying 15pounds of boost without any hesitation or detonation.By the way, the smoke also went!I love the extra power!!!
