thebigfelly Posted February 19, 2011 Posted February 19, 2011 just wana say my membership arrived today thanks , will get the stickers and tax disc holder on asap . now for the help part lol its never ending for me i suppose - noticed something with the rev counter that i havent noticed before, seems like a little bit of lag or something and i shall say sorry in advance for the shoddy camera work. when going through the gears and picking up the pace just after the turbo kicks in the rev needle dips down or stops for a second sometimes before carrying on through the rev range, sometimes itl drop 500 rev sometimes ive saw it drop 1000 revs from 4500 to 3600 ish then going back up , so thot id record it happening if it wld happen when i recorded it , in the video - at 0:15 secs in it stops at 4600 rpm just for a split second, - at 0:44 secs it gets up to 4400rpm drops down to 3600rpm then continues back up again before i start slowing down - at 1:26 it revs up to 4400rpm again it seems to stop for a second before conituing up the rev range p.s engine is warmed up and it stoping for a second has nothing to do with me changing gears i already made sure of that and this seems to happen in 3rd ,4th and 5th gear that ive noticed so far, just wondering if this is normal or if something is on the verge of going, other than this niggle car runs fine , just strange that ive not noticed it before ..
badbaz Posted February 19, 2011 Posted February 19, 2011 Hard to tell Paul with all that noise but it looks as though the clutch is slipping
thebigfelly Posted February 19, 2011 Author Posted February 19, 2011 Hard to tell Paul with all that noise but it looks as though the clutch is slipping guesing another expensive fix then.... tho never had any problems with clutches slipping on previous cars so wouldnt know , but i did hear that a sign of your clutch going was the biteing point on the car was higher or that it was harder to get through the gears , dunno if any of that is true, but the biteing point is still the same very low , and no problems going through gears or getting in the gears .
badbaz Posted February 19, 2011 Posted February 19, 2011 Put it in a higher gear, ideally up a hill and watch/listen to the revs as boost comes in. If revs rise too quickly and then fall back then clutch can't cope with highest torque but as torque falls the clutch recovers. Also try accelerating and give the clutch pedal a quick kick, revs should rise and immediately return to the correct level if clutch is normal. The only other thing that could cause what you see is an electrical fault.
gbsti Posted February 19, 2011 Posted February 19, 2011 Hi Bud, what year is your car? The dip could be AVCS change over point, cam change over point. Could be the AVCS solinoid but as baz says its difficult to hear and on my computer i could not see the pause very well Hopefully someone will be along soon to assist but maybe post this in general technical aswell!! Graeme
thebigfelly Posted February 19, 2011 Author Posted February 19, 2011 Put it in a higher gear, ideally up a hill and watch/listen to the revs as boost comes in. If revs rise too quickly and then fall back then clutch can't cope with highest torque but as torque falls the clutch recovers. Also try accelerating and give the clutch pedal a quick kick, revs should rise and immediately return to the correct level if clutch is normal. The only other thing that could cause what you see is an electrical fault. think may be electrical then , duno which way you went up to cathys , but i tried going up the hill just at hers , put it in 5th gear and all the way up the hill from about 2500rpm right through to about 4900rpm by the time i got to the top of the hill it climbed steadily and no dipping or stopin through the rev range, also tried the clutch kicking , they rose quickly and as soon as my foot was off it dropped straight back to what ever they were at before, so possibley electrical and hopefully a less expensive job than getting new clutch :
thebigfelly Posted February 19, 2011 Author Posted February 19, 2011 Hi Bud, what year is your car? The dip could be AVCS change over point, cam change over point. Could be the AVCS solinoid but as baz says its difficult to hear and on my computer i could not see the pause very well Hopefully someone will be along soon to assist but maybe post this in general technical aswell!! Graeme 2003 wrx sti blob eye , due its service and mot in a cpl months
badbaz Posted February 19, 2011 Posted February 19, 2011 LOL, I'm at Cathys just now! Never heard you. It would have slipped under those conditions for sure. Not sure AVCS would have that effect Graeme? Electrical fault may be cheaper but could be a lot harder to solve. Not sure if these clocks have problems, certainly never read about issues. The rpm signal comes from the ecu.
Wee Jock Posted February 19, 2011 Posted February 19, 2011 Does your car have fly by wire throttle? not sure when this came in!
Alastair Posted February 19, 2011 Posted February 19, 2011 Just to confirm when the needle sticks or drops does it affect the engine, ie if yo never looked at the needle does the car feel fine through acceleration, so it's just the needle movement that's. Wrong .???
thebigfelly Posted February 20, 2011 Author Posted February 20, 2011 aye engine feels fine , didnt notice anything until i looked at the needle , engine seemed to go fine and power still seems to be there
Alastair Posted February 20, 2011 Posted February 20, 2011 Definitely sounds electrical only then. As Barry said this will be harder to find the fault . Think you may need to get a main dealer to put their diagnostics on for a full test they should be able to isolate where the voltage difference is in that system. Hopefully a cheap fix.......
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