Mark Ayling Posted September 6, 2003 Share Posted September 6, 2003 My description is going to be as technical as the thread title A bit difficult to explain really, but here goes... When you open the bonnet of a standard Supra and rev the engine, it makes that kind of massive roar/suction noise. Then when you stick a Hiper or something on, you can't hear it as well because of the sound of the exhaust. (with me so far? ) Well in the last few days, I've noticed that my engine has started making that sound, but many times louder than the sound of a standard Supra - I can hear it over the Hiper, and even on the motorway! I actually really like the noise, it sounds really meaty, like a truck engine or something, but clearly its not normal as its only started doing it recently. I hope someone understands what I'm on about, I wasn't sure how else to explain it! Oh, by the way, the car is driving fine - no boost (or other) problems that I'm aware of. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
Digsy Posted September 6, 2003 Share Posted September 6, 2003 If you are talking about induction noise, have a look for a split pipe or hose between the air filter and the throttle body. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 6, 2003 Author Share Posted September 6, 2003 Originally posted by Darren Blake If you are talking about induction noise, have a look for a split pipe or hose between the air filter and the throttle body. Could be I guess - would a leak in the induction system still allow the turbos to boost successfully? Quote Link to comment Share on other sites More sharing options...
Terminator Posted September 6, 2003 Share Posted September 6, 2003 If is after the filter, but before the turbos then it would. But your tturbos would be at the mercy of unfiltered air:eek: Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 6, 2003 Author Share Posted September 6, 2003 Originally posted by Terminator If is after the filter, but before the turbos then it would. But your tturbos would be at the mercy of unfiltered air:eek: Am I right in thinking that if it was after the turbos that there would be boost/lag issues? Quote Link to comment Share on other sites More sharing options...
Digsy Posted September 6, 2003 Share Posted September 6, 2003 Sorry - I should have said between the air filter and the turbos. If the leak is downstream of the turbos then boost will be be affected to some degree, but upstream the only difference would be that you are sucking dirty air. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 6, 2003 Author Share Posted September 6, 2003 So if I'm not suffering any boost problems at all then I'm basically looking for some sort of leak between the green musroom and the turbos then? Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 7, 2003 Author Share Posted September 7, 2003 Right, I've just been out and had a look. I can't see/detect and sort of leak, all the fixings are fine and nothing's off/loose. The fan is on constantly though, and it does sound like the fan that's making the noise. So am I right in thinking that the fan should only come on at a certain temperature, and the fact that mine is on constantly suggests a dodgy sensor/switch or something? Quote Link to comment Share on other sites More sharing options...
400BHP Posted September 7, 2003 Share Posted September 7, 2003 Which fan? the huge one attached to the engine is a viscous fan that only becomes a fixed blade fan at a certain engine temperature, at all other times its not positively engaged to the pulley (you can stop it with your hand while the engine is running) Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 7, 2003 Author Share Posted September 7, 2003 Originally posted by 400BHP Which fan? the huge one attached to the engine.... Yep, that one... Originally posted by 400BHP (you can stop it with your hand while the engine is running) Er....I bloody can't at the moment I take it I'm right with the sensor/switch theory then? Quote Link to comment Share on other sites More sharing options...
Terminator Posted September 7, 2003 Share Posted September 7, 2003 There is no switch or sensor on the fan it is a viscous coupled unit. They can and do stop working and can stay on all the time. I normal conditions the fan will rotate but it may be that yours has gone. I had one go on a Cossie sounded like a turbine quite cool really. I would not suggest trying to stop it with your hand though, unless you dislike one or two of your fingers enough to drop them in the under tray. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 7, 2003 Author Share Posted September 7, 2003 Originally posted by Terminator There is no switch or sensor on the fan it is a viscous coupled unit. They can and do stop working and can stay on all the time. I normal conditions the fan will rotate but it may be that yours has gone. I had one go on a Cossie sounded like a turbine quite cool really. I would not suggest trying to stop it with your hand though, unless you dislike one or two of your fingers enough to drop them in the under tray. OK I'm not going to claim I understand that (especially having just got back after drinking since 3.00pm! ), but are you saying that I may need a whole new fan then? Or could something else being faulty cause it? BTW I wasn't going to try and stop the fan with my hand! Quote Link to comment Share on other sites More sharing options...
400BHP Posted September 8, 2003 Share Posted September 8, 2003 With the engine off, and cold, see if you can spin the fan easily, if not, then either your viscous coupling is U/S or its been modified to be on all the time, i think the latter is doubtful. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 8, 2003 Author Share Posted September 8, 2003 Originally posted by 400BHP With the engine off, and cold, see if you can spin the fan easily, if not, then either your viscous coupling is U/S or its been modified to be on all the time, i think the latter is doubtful. Yep, I tried that yesterday - the fan didn't spin freely. So my viscous coupling is stuffed - does that entail a whole new fan assembly or just part of it? TIA Quote Link to comment Share on other sites More sharing options...
400BHP Posted September 8, 2003 Share Posted September 8, 2003 The fan and fluid coupling are one unit, this unbolts from the pulley, you may need a cranked spanner to undo the nut. Left hand thread. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 8, 2003 Author Share Posted September 8, 2003 Originally posted by 400BHP The fan and fluid coupling are one unit, this unbolts from the pulley, you may need a cranked spanner to undo the nut. Left hand thread. Nice one, cheers for that Just spoke to the garage and the fan's 140-something quid! Still, the labour will be next to nothing as its a very simple job. Thanks again chaps Quote Link to comment Share on other sites More sharing options...
400BHP Posted September 8, 2003 Share Posted September 8, 2003 is that 140 for a new one or a second hand jobbie? there's a supra breakers round the corner from me want his number? Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 8, 2003 Author Share Posted September 8, 2003 Originally posted by 400BHP is that 140 for a new one or a second hand jobbie? there's a supra breakers round the corner from me want his number? That's for a new one. The breaker's number would be good, cheers - definitely worth a try Quote Link to comment Share on other sites More sharing options...
400BHP Posted September 9, 2003 Share Posted September 9, 2003 I'll get his card out of my work van and post it for you later today mate... Unless you need it urgently, if you do, give me a call on 07855 364890 and i'll give you it straight away. Quote Link to comment Share on other sites More sharing options...
Dragonball Posted September 9, 2003 Share Posted September 9, 2003 Mark Check with Dude if he still has his old viscous Cheers Paul Quote Link to comment Share on other sites More sharing options...
400BHP Posted September 9, 2003 Share Posted September 9, 2003 The guys number is 01474 815532 And he calls himself "SUPRAMAN" Here's his address Quote Link to comment Share on other sites More sharing options...
Jake Posted September 29, 2003 Share Posted September 29, 2003 Mark, did you get this sorted out? Where did you get it from in the end? Mines gone too. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted September 29, 2003 Author Share Posted September 29, 2003 Originally posted by Jake Mark, did you get this sorted out? Where did you get it from in the end? Mines gone too. Went for a new viscous coupling in the end, cost me about £140 plus (very little, 1/2 hour or less I think) labour. I used Woodcock Hill, who I normally go to. Quote Link to comment Share on other sites More sharing options...
Jake Posted September 29, 2003 Share Posted September 29, 2003 Originally posted by Mark Ayling Went for a new viscous coupling in the end, cost me about £140 plus (very little, 1/2 hour or less I think) labour. I used Woodcock Hill, who I normally go to. ok, thanks mate Quote Link to comment Share on other sites More sharing options...
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