Martin Hay-Plumb Posted May 5, 2008 Share Posted May 5, 2008 200 miles on the clock and first blat to Stoneleigh yesterday - everything seemd fine except the diff (LSD) is noisy/whiney under power. Is it a case of TADT or should I investigate it futher? I know 7's are noisy, but the diff is posbly the noisyest thing on the car?? Any car which holds together for a whole race is too heavy....C Chapman Link to comment Share on other sites More sharing options...
Dickie Normuss Posted May 5, 2008 Share Posted May 5, 2008 TADTS 😬 VX HPC - Loud and proud here Watch out, whatever hits the fan will not be distributed evenly Link to comment Share on other sites More sharing options...
rj Posted May 5, 2008 Share Posted May 5, 2008 TADTS! Link to comment Share on other sites More sharing options...
rj Posted May 5, 2008 Share Posted May 5, 2008 Bu$$er! MTF! 😬 Link to comment Share on other sites More sharing options...
STEVE GILBERT Posted May 5, 2008 Share Posted May 5, 2008 Get an old diff out of a Sierra and have the slip unit put in it. Reading on hear the ammount of people who complain about this it's clear that either all the re-manufactured diffs are crap or whoever is building them hasn't a clue. Steve See My Caterham Fireblade Here. Link to comment Share on other sites More sharing options...
Dickie Normuss Posted May 5, 2008 Share Posted May 5, 2008 Or it might be that without the copious sound proofing and the greater distance between diff and driver in the tin tips it's simply more audible VX HPC - Loud and proud here Watch out, whatever hits the fan will not be distributed evenly Link to comment Share on other sites More sharing options...
rj Posted May 5, 2008 Share Posted May 5, 2008 sound proofing Unknown word in the Seven World! Link to comment Share on other sites More sharing options...
R400 Velocity R Posted May 5, 2008 Share Posted May 5, 2008 TADTS But if your unconvinced get another club member with a LSD to go with you Link to comment Share on other sites More sharing options...
Fishy Dave Posted May 5, 2008 Share Posted May 5, 2008 Forgive my ignorance, I've never come across 'TADTS' before? What does it stand for? My LSD is getting noisier too. ☹️ Link to comment Share on other sites More sharing options...
6speedmanual Posted May 5, 2008 Share Posted May 5, 2008 Hi Martin The LSD function is not making any difference to the sound. The whine (demented bacon slicer sound) is from the meshing of the crown wheel and the pinion. Variations in build tolerance can make some noisier than others so it may be possible to get it reset and improve the situation, but as mentioned above a lot of the noise heard is due to lack of sound insulation and close proximity of the unit.... On a slightly different note: When driving my 7 I wear disposable yellow foam E-A-R (brand) protective ear plugs. I can still hear plenty to enjoy the soundtrack when driving, but the combination of exhaust, induction, transmission whine, tyre noise and turbulent airflow is better excluded from my one set per lifetime of ears. Short term tinnitus after blatting is a sign of potential to cause permanent damage. At least one 7er I know has full time tinnitus suspected to be from noise in his car. P 6SpeedManual *tongue*There's no such thing as too much BHP per Ton 😬 Link to comment Share on other sites More sharing options...
dickbowyer Posted May 6, 2008 Share Posted May 6, 2008 TADTS - "They All Do That Sir" Dick Superlight SV Duratec R400 Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 6, 2008 Leadership Team Share Posted May 6, 2008 When I first drove my new car I thought the diff noise was horrendous. I've now worked out it's mostly the gearbox, having changed from a nice quiet 5sp in the old car to a noisy 6sp in the new. There's been quite a lot of discussion about this, particularly th whine caused in 4th! Stu. Link to comment Share on other sites More sharing options...
Darren Ward Posted July 18, 2008 Share Posted July 18, 2008 Hello people. Thought my LSD was noisy but being a Caterham virgin and reading threads like this one was convinced that TADTS. Just back from 1st 12 month service at Caterham Midlands and after it was road tested was told it was one of the worst sounding diffs. they had heard Good news is they have ordered me a new one under warranty Oulton Park track day next Tuesday, hope it holds out Just got to get it back to them.... again, when the new LSD arrives 🙆🏻Bit of a treck. Darren Link to comment Share on other sites More sharing options...
shn7 Posted July 18, 2008 Share Posted July 18, 2008 If you think you've got a noisy diff then try installing a straight cut gearbox. You'll think the diff was almost silent. And please do wear decent ear protection or you will suffer later. Steve. Sussex (West) AR Not forgetting Percy the Polar Bear Link to comment Share on other sites More sharing options...
I.Mupferit Posted July 18, 2008 Share Posted July 18, 2008 My diff has become stupidly loud of late and upon talking to a knowledgeable person in the building of diffs and gearboxes a couple of days ago, he opined that CC supplied diffs frequently have the bearing pre-load way too tight, resulting in all manner of 'orrible noises. Mine will be out soon for a major overhaul, followed by the gearbox I fear, but just waiting to see how much a properly built diff quietens things down before committing. Link to comment Share on other sites More sharing options...
Graham Perry Posted July 19, 2008 Share Posted July 19, 2008 Martin, I presume you have a plate type LSD ? If so noises are quite normal. However if its the torque biasing type then these are normally silent apart from the odd bit of backlash during on/off throttle Link to comment Share on other sites More sharing options...
stevefoster Posted July 20, 2008 Share Posted July 20, 2008 Road and Race put in my AP suretrack / set it up in 2003 - it is still very quiet today. If it's down to the crown wheel and the pinion then I must have a good'un. Add lightness, says the man with a VX :-) My 2002/2003 racing pics here General pics (mostly of 7's and cars). here Link to comment Share on other sites More sharing options...
paul jacobs Posted July 21, 2008 Share Posted July 21, 2008 The Caterham supplied one in my CSR is still as quiet as a mouse, 3 years down the line and with around 9000 miles on it. It was a rebuilt one, set up by Road and Race specially for CC, with a low preload I believe. So it may be a case of SOTDTS [some of Them Do That Sir] but not TADTS and Darrens' experience may be worth noting. Paul J. Loud pipes save lives, but quiet ones save your hearing. Link to comment Share on other sites More sharing options...
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