Please help - JDM STI-7 audible det !!!!!
#1
Please help - JDM STI-7 audible det !!!!!
Hi all,
Background:
Car: JDM STI-7 - 26 kms on the tach
Mods: ScoobySport turbo back zorst no cats, walbro uprated fuel pump, mail in remapped ecu by ScoobySport running 1.20 - 1.25 max boost in 4th gear mapped for 98 RON fuel, estimated 330 bhp by delta dash road dyno outside ambient temp 33' C
Problem: I have been running the above setup for about 12 months or more never noticed a problem. Two days ago I was driving home from work with less than a 1/4 tank of gas and for the first time I heard det....
I am 99.99% sure it is det.....sounds exactly like little nails being dropped in a tin can. It happens at higher revs and I can 'feel' the car is not quite as fast....the little nails are like a noise in the background but has to be det that I can hear and friends have heard as well....
I did a delta dash log and noticed that even when driving around very very easy under 3500 rpms the DD registered -6 degrees knock correction at some point ??? I did a DD run in 3rd gear and can't seem to see anything strange but then again I am no expert...
I filled up with gas thinking maybe the low gas tank was causing problems but its still detting......
Questions:
How many gallons of gas does the fuel lines, fuel filter etc hold ? I am hoping that maybe the crappy fuel is still in the lines and still causing the det, only done about 70 kms since fillup and still detting, perhaps still bad fuel in the lines filter etc ?
Why would the car be detting all of a sudden when everything has been fine ? I have checked hoses etc and can't see any problems.....what should I be looking for ?
Any guesses what could be causing the problem ?
I have the two DD logs in 3rd gear and can email them to someone if they would be kind enough to have a look and see if anything looks strange...
Please help me out guys as there are no Subaru or real tunning specialist here so I need help ...thanks...
Pat and Pete from ScoobySport.....any ideas ? never had a problem with your setup till now.....would you like to see the DD log ?
Guys I can run any DD logs you would like to see with any parameters you want me to log...
Please help me out as I have no idea what to do...
Have I done any major damage by running the car hard the few times to hear the det (probably about 6 - 10 times).....I am currently driving it very very easy below 4k rpms with zero boost just to get around, will this hurt her anymore ?
Cheers,
R
Background:
Car: JDM STI-7 - 26 kms on the tach
Mods: ScoobySport turbo back zorst no cats, walbro uprated fuel pump, mail in remapped ecu by ScoobySport running 1.20 - 1.25 max boost in 4th gear mapped for 98 RON fuel, estimated 330 bhp by delta dash road dyno outside ambient temp 33' C
Problem: I have been running the above setup for about 12 months or more never noticed a problem. Two days ago I was driving home from work with less than a 1/4 tank of gas and for the first time I heard det....
I am 99.99% sure it is det.....sounds exactly like little nails being dropped in a tin can. It happens at higher revs and I can 'feel' the car is not quite as fast....the little nails are like a noise in the background but has to be det that I can hear and friends have heard as well....
I did a delta dash log and noticed that even when driving around very very easy under 3500 rpms the DD registered -6 degrees knock correction at some point ??? I did a DD run in 3rd gear and can't seem to see anything strange but then again I am no expert...
I filled up with gas thinking maybe the low gas tank was causing problems but its still detting......
Questions:
How many gallons of gas does the fuel lines, fuel filter etc hold ? I am hoping that maybe the crappy fuel is still in the lines and still causing the det, only done about 70 kms since fillup and still detting, perhaps still bad fuel in the lines filter etc ?
Why would the car be detting all of a sudden when everything has been fine ? I have checked hoses etc and can't see any problems.....what should I be looking for ?
Any guesses what could be causing the problem ?
I have the two DD logs in 3rd gear and can email them to someone if they would be kind enough to have a look and see if anything looks strange...
Please help me out guys as there are no Subaru or real tunning specialist here so I need help ...thanks...
Pat and Pete from ScoobySport.....any ideas ? never had a problem with your setup till now.....would you like to see the DD log ?
Guys I can run any DD logs you would like to see with any parameters you want me to log...
Please help me out as I have no idea what to do...
Have I done any major damage by running the car hard the few times to hear the det (probably about 6 - 10 times).....I am currently driving it very very easy below 4k rpms with zero boost just to get around, will this hurt her anymore ?
Cheers,
R
#3
Hi,
Anything I can do to test this ? Is there something I can look for on a DD log to see this, any other tests ?
I guess it could be this but I have heard that the STI-7 MAFs are very rugged and almost none have been replaced.
Cheers,
R
Anything I can do to test this ? Is there something I can look for on a DD log to see this, any other tests ?
I guess it could be this but I have heard that the STI-7 MAFs are very rugged and almost none have been replaced.
Cheers,
R
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#10
When you experience -6 deg of knock correction I would realy only drive VERY VERY easy with the car until you find the cause!!!
The MAF's of the WRX from MY01 also fail! I've seen 2 already who had to be replaced........
P.S. you could send me the DD logs, but I can only look from tommorow morning when I am in my shop.
mark@ems-tuning.nl
Mark.
The MAF's of the WRX from MY01 also fail! I've seen 2 already who had to be replaced........
P.S. you could send me the DD logs, but I can only look from tommorow morning when I am in my shop.
mark@ems-tuning.nl
Mark.
Last edited by EMS; 28 March 2004 at 06:38 PM.
#11
Mark, can you explain the relationship between DET and a failing MAF? The limit of my knowledge, which is very limited is that a failing MAF makes the car run lean, which is why many people use a Lambdalink to monitor air/fuel ratio. I'd like to learn something new.
LoFi
LoFi
#12
Subaru Tuning Specialist
Join Date: Jun 2002
Location: 7.74 @179 mph 1/4 mile - road legal
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Hi Piers
A failing MAF generally reads lower than the correct airflow level. This has a twofold effect, one is the obvious one that less fuel is added and the car runs lean (hotter) secondly, the mass air flow is the primary load with regard to ignition advance. If the load reads low then the ignition will be more advanced.
Lean and over advanced - guaranteed to cause a problem on a scoob
Andy
A failing MAF generally reads lower than the correct airflow level. This has a twofold effect, one is the obvious one that less fuel is added and the car runs lean (hotter) secondly, the mass air flow is the primary load with regard to ignition advance. If the load reads low then the ignition will be more advanced.
Lean and over advanced - guaranteed to cause a problem on a scoob
Andy
#13
Originally Posted by Razor2001
Anything I can do to test this ? Is there something I can look for on a DD log to see this, any other tests ?
I guess it could be this but I have heard that the STI-7 MAFs are very rugged and almost none have been replaced.
I guess it could be this but I have heard that the STI-7 MAFs are very rugged and almost none have been replaced.
Not 100% sure on how you would test one though?
Are you running standard induction?
Nathan..
#14
Ecu Specialist
if you email me the logs I'll take a look at them, sure you are seeing minus 6 degrees and not just 6 ? pats not in the Uk at the mo so I would be glad to help out if I can
bob (rbr@brdevelopments.com)
bob (rbr@brdevelopments.com)
#15
Hi all,
Yes ! 100% sure it was - 6 degrees knock correction and this was just 1/2 throttle max 5,000 rpms !!! BUT crazy thing was when I ran the DD logs in 3rd gear I did not see any negative knock correction ???? I saw the - 6 knock correction in the minmum column in the DD log after driving very easy around ???
Any MAF tests out there guys ???
Cheers,
Ray
Yes ! 100% sure it was - 6 degrees knock correction and this was just 1/2 throttle max 5,000 rpms !!! BUT crazy thing was when I ran the DD logs in 3rd gear I did not see any negative knock correction ???? I saw the - 6 knock correction in the minmum column in the DD log after driving very easy around ???
Any MAF tests out there guys ???
Cheers,
Ray
#16
Thank you all for the help. I am still not sure what is cuasing the det. I am going to run some more logs and see if anything strange pops out at me. I will also compare these logs to some older ones before I noticed the problem. If you have any ideas please throw them out there.
Thanks again and I will keep you all posted after more runs are complete.
Cheers,
Ray
Thanks again and I will keep you all posted after more runs are complete.
Cheers,
Ray
#17
Scooby Regular
Razor2001,
Get a knocklink fitted asap.
I'm no mechanic but I fitted my knocklink at the weekend, and it was fairly easy.
I too was concerned about potential det, but the knocklink shows nothing but 2 green lights on full chat...
Get a knocklink fitted asap.
I'm no mechanic but I fitted my knocklink at the weekend, and it was fairly easy.
I too was concerned about potential det, but the knocklink shows nothing but 2 green lights on full chat...
#18
Hi Mark,
I am trying to find a USA supplier for the knockLink as shipping from UK will be expensive and we also pay duty on freight and invoice cost (42% duty) !
Cheers,
Ray
I am trying to find a USA supplier for the knockLink as shipping from UK will be expensive and we also pay duty on freight and invoice cost (42% duty) !
Cheers,
Ray
#19
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Join Date: Sep 2001
Location: Kingston ( Surrey, not Jamaica )
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#22
Originally Posted by Andy.F
Hi Piers
A failing MAF generally reads lower than the correct airflow level. This has a twofold effect, one is the obvious one that less fuel is added and the car runs lean (hotter) secondly, the mass air flow is the primary load with regard to ignition advance. If the load reads low then the ignition will be more advanced.
Lean and over advanced - guaranteed to cause a problem on a scoob
Andy
A failing MAF generally reads lower than the correct airflow level. This has a twofold effect, one is the obvious one that less fuel is added and the car runs lean (hotter) secondly, the mass air flow is the primary load with regard to ignition advance. If the load reads low then the ignition will be more advanced.
Lean and over advanced - guaranteed to cause a problem on a scoob
Andy
So whilst there are two effects in either case this would be picked up via a lambdalink as you cannot have one effect without the other?
Piers LoFi
by the way TD05 works a treat (although 'some' modifications required to get it to fit). Thanks for getting it to me in time.
#26
Sorry guys,
Actually it was - 6 degrees of timing on the minimum column of DD not - 6 degrees of knock correction....sorry for the mistake ! Not sure how this affects peoples thoughts so far though ?
Cheers,
Ray
Actually it was - 6 degrees of timing on the minimum column of DD not - 6 degrees of knock correction....sorry for the mistake ! Not sure how this affects peoples thoughts so far though ?
Cheers,
Ray
Last edited by Razor2001; 30 March 2004 at 02:21 AM.
#28
Update:
I have had a couple of pros look over my maps and no one can seem to find anything 'jumping' out at them ?? Is it possible I am hearing something else and not det ? Is there anything else that would make this background, tiny nails dropping in a tin can sound on revs over 5,500 or so rpms ??
Cheers,
Ray
PS: I should have a knocklink installed in a few weeks...they guy is telling me to buy a subaru sensor rather than the link or bosch one, he says the subaru sensor is tuned for the subaru block and it's unique frequency sounds and that different engine types give off drifferent frequencies etc and that is why the subaru sensor is better ....any truth to this or usual salesman crapola ?
I have had a couple of pros look over my maps and no one can seem to find anything 'jumping' out at them ?? Is it possible I am hearing something else and not det ? Is there anything else that would make this background, tiny nails dropping in a tin can sound on revs over 5,500 or so rpms ??
Cheers,
Ray
PS: I should have a knocklink installed in a few weeks...they guy is telling me to buy a subaru sensor rather than the link or bosch one, he says the subaru sensor is tuned for the subaru block and it's unique frequency sounds and that different engine types give off drifferent frequencies etc and that is why the subaru sensor is better ....any truth to this or usual salesman crapola ?