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NBM33 · 16th July 2008, 10:00 PM

How does the stock ecu on a R33 GTR detect detonation and deal with the problem. Does it default to more retarded ignition setting?

mp302007 · 17th July 2008, 05:58 AM

there are two det. sensors mounted on the block, under the inlet plenum. i think these are piezo-type transducers, so generate a voltage proportional to incident movement/vibration. they will give a more pronounced "spike" if/when det. occurs, which is fed to the ecu. you're right regards the timing.

NBM33 · 17th July 2008, 07:30 AM

Thanks..With the safety features that the stock ecu has, I'm wondering what advantages there is in upgrading to a aftermarket ecu.

ahapartridge · 17th July 2008, 07:39 AM

The stock ECU is not mapped to deal with bigger injectors, more airflow from more boost/bigger Turbo's, and differing signals from other AFM's

NBM33 · 17th July 2008, 07:50 AM

Quote:

Originally Posted by ahapartridge

The stock ECU is not mapped to deal with bigger injectors, more airflow from more boost/bigger Turbo's, and differing signals from other AFM's

Thanks Pete..So i guess then that the ECU i have must of been mapped some how in japan. I will see if there is anything written on the case that gives me some idea who chipped it . The only info i have from Marc@ Topspec imports is that it is a stock ecu with a good map on it .

ahapartridge · 17th July 2008, 07:54 AM

Yep, the only trouble is Neil is that it will have been set up for 100ron fuel.

It may be worth you getting the fueling checked on a Dyno, you never know it might be ok on V-power

NBM33 · 17th July 2008, 07:57 AM

Quote:

Originally Posted by ahapartridge

Yep, the only trouble is Neil is that it will have been set up for 100ron fuel.

It may be worth you getting the fueling checked on a Dyno, you never know it might be ok on V-power

Rob at Perfect touch has had it on the dyno . Im waiting to hear the results and if it is safe to use V-power

mp302007 · 17th July 2008, 07:33 PM

sorry for butting in and excuse my ignorance about petrol choice, but does the ron rating make that much of a difference? i simply thought it basically affected how susceptible the engine is to knock when caned. am i right in thinking that higher ron fuel burns slower than that of a lower ron, so for the same ignition advance knock it reduced (or removed)?

the stock ecu has some degree of self learning in that it can alter the ignition timing according to the knock signal it receives. i thought that if you regularly use "normal" fuel and have reset the ecu's learned setting then you'd be ok.

please tell me if this it utter b0ll0cks.

SamuraiSam · 17th July 2008, 09:56 PM

Utter B.S.

The ECU can't pull timing until it actually detects knock, which means the engine has ALREADY been run with too much timing, for at least a few revoltions, which can be enough time to kill the engine. It's adaptive learning, not precognitious. once the knock has been detected, the ECU goes to severely conservative timing #'s which generate high EGT and make less power than the correct amount of advance.

standalone ECU's are a necessity if you want your car to make power and/or be reliable. Yeah the old adage of 'Fast, Cheap, Reliable' is in the corner of both Fast and Reliable.

16th July 2008, 10:00 PM	#1 (permalink)
NBM33 GTR Register Member Join Date: Jan 2006 Location: AKA..Chipper on SOC....Hereford Posts: 487	Stock ECU How does the stock ecu on a R33 GTR detect detonation and deal with the problem. Does it default to more retarded ignition setting?

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17th July 2008, 05:58 AM	#2 (permalink)
mp302007 GTR Register Member Join Date: Nov 2005 Location: Belper, Derbyshire Posts: 123	there are two det. sensors mounted on the block, under the inlet plenum. i think these are piezo-type transducers, so generate a voltage proportional to incident movement/vibration. they will give a more pronounced "spike" if/when det. occurs, which is fed to the ecu. you're right regards the timing.

17th July 2008, 07:30 AM	#3 (permalink)
NBM33 GTR Register Member Join Date: Jan 2006 Location: AKA..Chipper on SOC....Hereford Posts: 487	Thanks..With the safety features that the stock ecu has, I'm wondering what advantages there is in upgrading to a aftermarket ecu.

17th July 2008, 07:39 AM	#4 (permalink)
ahapartridge GTROC Member Join Date: May 2003 Location: Warrington Posts: 1,126	The stock ECU is not mapped to deal with bigger injectors, more airflow from more boost/bigger Turbo's, and differing signals from other AFM's

17th July 2008, 07:54 AM	#6 (permalink)
ahapartridge GTROC Member Join Date: May 2003 Location: Warrington Posts: 1,126	Yep, the only trouble is Neil is that it will have been set up for 100ron fuel. It may be worth you getting the fueling checked on a Dyno, you never know it might be ok on V-power

17th July 2008, 07:33 PM	#8 (permalink)
mp302007 GTR Register Member Join Date: Nov 2005 Location: Belper, Derbyshire Posts: 123	sorry for butting in and excuse my ignorance about petrol choice, but does the ron rating make that much of a difference? i simply thought it basically affected how susceptible the engine is to knock when caned. am i right in thinking that higher ron fuel burns slower than that of a lower ron, so for the same ignition advance knock it reduced (or removed)? the stock ecu has some degree of self learning in that it can alter the ignition timing according to the knock signal it receives. i thought that if you regularly use "normal" fuel and have reset the ecu's learned setting then you'd be ok. please tell me if this it utter b0ll0cks.

17th July 2008, 09:56 PM	#9 (permalink)
SamuraiSam GTR Register Member Join Date: Oct 2007 Posts: 390	Utter B.S. The ECU can't pull timing until it actually detects knock, which means the engine has ALREADY been run with too much timing, for at least a few revoltions, which can be enough time to kill the engine. It's adaptive learning, not precognitious. once the knock has been detected, the ECU goes to severely conservative timing #'s which generate high EGT and make less power than the correct amount of advance. standalone ECU's are a necessity if you want your car to make power and/or be reliable. Yeah the old adage of 'Fast, Cheap, Reliable' is in the corner of both Fast and Reliable.