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Mar 5, 2007, 01:11 AM
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#1
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Newbie
Personal Sales Rating: ( 0)
Join Date: May 2006
Location: SG
Posts: 97
Drives: ATR
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SAFC2: Knock during deceleration/idling
Recently, the weather is getting hotter and hotter (98F there about), after the year end cool weather.
My knock sensor on the SAFC2 had been 0 all the while and recently, during a hot afternoon with a mixture of stop and go driving, with the engine well warmed up, coolant temperature is normal, my SAFC2 shows like 50 to 60 knocks, but once I accelerate, it shows 0. It only shows up on deceleration and idling.
Which area should I improve on ? The low rpm or should I adjust the Deceleration function ?
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Mar 5, 2007, 01:24 AM
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#2
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Evolving Member
Personal Sales Rating: ( 3)
Join Date: Dec 2004
Posts: 138
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I was under the impression that we were not sapposed to use the knock feature on the evo because it interferes with the ecu's ablilty to determine knock...
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Mar 5, 2007, 01:26 AM
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#3
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Newbie
Personal Sales Rating: ( 0)
Join Date: May 2006
Location: SG
Posts: 97
Drives: ATR
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The knock sensor on the SAFC2 only shows the reading and not interferring with the ECU at all.
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Mar 5, 2007, 10:32 AM
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#4
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Newbie
Personal Sales Rating: ( 36)
Join Date: Nov 2003
Location: CANADA
Posts: 50
Drives: supra turbo
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i wouldn;'t tune by the knock feature on the safc
pretty much useless.
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Mar 5, 2007, 10:03 PM
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#5
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Evolving Member
Personal Sales Rating: ( 8)
Join Date: Jan 2007
Location: Bel Air, Maryland
Posts: 312
Drives: 03 Evolution
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what clutch do you have? i know some clucthes i ran were a rattle box on decel....could it be picking that up?
__________________
Custom hard pipes and intake pipe
made by tempest racing
Mini battery kit
ECU flash
MBC
Walbro fuel pump
1000cc injectors
Pruven FMIC
HKS ssq bov
HKS 264 cams
3" tbe & cat delete
ARP head studs
HPF single disk clutch
Rev hard manifold
Tial 38mm waste gate
Turbo: T3 Borg warner 362
555whp/466TQ@ 32psi
Stockblock & MAF
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Mar 6, 2007, 12:35 AM
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#6
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Newbie
Personal Sales Rating: ( 0)
Join Date: May 2006
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Posts: 97
Drives: ATR
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Not possibly clutch, as I don't have the problem before, and it's only during very hot weather. Morning is fine though
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Mar 7, 2007, 10:17 PM
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#7
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Evolving Member
Personal Sales Rating: ( 8)
Join Date: Jan 2007
Location: Bel Air, Maryland
Posts: 312
Drives: 03 Evolution
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If you dont have knock under full trottle u dont have a problem...i really think your knock sensor is picking up noise.
i wouldnt touch anything. The sensor might be going bad.
__________________
Custom hard pipes and intake pipe
made by tempest racing
Mini battery kit
ECU flash
MBC
Walbro fuel pump
1000cc injectors
Pruven FMIC
HKS ssq bov
HKS 264 cams
3" tbe & cat delete
ARP head studs
HPF single disk clutch
Rev hard manifold
Tial 38mm waste gate
Turbo: T3 Borg warner 362
555whp/466TQ@ 32psi
Stockblock & MAF
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Mar 7, 2007, 10:27 PM
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#8
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Evolving Member
Personal Sales Rating: ( 8)
Join Date: Jan 2007
Location: Bel Air, Maryland
Posts: 312
Drives: 03 Evolution
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Quote:
Originally Posted by silverstream
Not possibly clutch, as I don't have the problem before, and it's only during very hot weather. Morning is fine though
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And yes it could possibly could be the clutch..if you tell me what u have.
hot wheather
stop and go traffic
clutch wearing out
All will be VERY noisey...spiecally on decel and idle (with clutch out) on a ceramic clutch.
you said u didnt have this problem before..probably because:
colder wheather
no stop and go traffic
clutch had more life
__________________
Custom hard pipes and intake pipe
made by tempest racing
Mini battery kit
ECU flash
MBC
Walbro fuel pump
1000cc injectors
Pruven FMIC
HKS ssq bov
HKS 264 cams
3" tbe & cat delete
ARP head studs
HPF single disk clutch
Rev hard manifold
Tial 38mm waste gate
Turbo: T3 Borg warner 362
555whp/466TQ@ 32psi
Stockblock & MAF
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Apr 4, 2007, 02:17 PM
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#9
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Evolved Member
Personal Sales Rating: ( 10)
Join Date: Jun 2004
Location: cincinnati, oh
Posts: 591
Drives: 03 evo 8
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Disregard the knock readings on the SAFC-II. It is useless. It has been proven many times that it is not accurate on our cars.
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AWD-Making bad drivers look good since 1980
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Apr 4, 2007, 02:20 PM
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#10
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Evolved Member
Personal Sales Rating: ( 12)
Join Date: Mar 2005
Location: Spec Ops
Posts: 2,205
Drives: Evolution Baby
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search you noobs. don't read knock off the SAFC. it's worthless.
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Apr 20, 2007, 03:07 PM
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#11
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Evolving Member
Personal Sales Rating: ( 38)
Join Date: Jul 2005
Location: somewhere in NC...
Posts: 363
Drives: a soon to be built FORCE-FED PERFORMANCE beast...
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vboy-newbs need love too... j/k, and he is so right just as everyone else has said.. the SAFC sux big ballz when it comes to reading knock.. it has no bearing on what is really going on. I have been tuning with the SAFC with a base flash from Works for about a year now and dont look at the knock monitor portion ever.. its ridiculous.. I upgraded to a new twin-cf clutch and it hit 50 before I went to 4K RPM.. it was retarded.. anyway, get a real data logger and you'll see better monitoring capabilites at RPM's.. good luck
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