Steve_Farrimond Posted March 10, 2013 Share Posted March 10, 2013 Went to the rollers on Saturday see blog if interested; http://forum.wscc.co.uk/forum/index.php/blog/20/entry-57-engine-setup/ Quote Link to comment Share on other sites More sharing options...
Norman Verona Posted March 11, 2013 Share Posted March 11, 2013 16% reductio due to transmission loss maybe a bit conservative. With a LSD it can approach 30%. Quote Link to comment Share on other sites More sharing options...
Terry Everall Posted March 11, 2013 Share Posted March 11, 2013 30% seems a bit high Norm! even with a LSD Quote Link to comment Share on other sites More sharing options...
Norman Verona Posted March 11, 2013 Share Posted March 11, 2013 Up to 30%. I've seen evidence of 26% when an engine was dyno'ed then, after fitting was RR'd. Wouldn't take much more friction to get that to 30. Anyway, 16% is conservative. Quote Link to comment Share on other sites More sharing options...
Terry Everall Posted March 11, 2013 Share Posted March 11, 2013 Lets agree on 23% then as a half way house Quote Link to comment Share on other sites More sharing options...
Norman Verona Posted March 11, 2013 Share Posted March 11, 2013 OK. 50% more than 16% Quote Link to comment Share on other sites More sharing options...
Ian Podmore Posted March 11, 2013 Share Posted March 11, 2013 I'm being thick (maybe) but why would an LSD increase the transmission losses? It only prevents slip between the axles so if both axles are rotating at same speed where do the additional losses come from? Quote Link to comment Share on other sites More sharing options...
Norman Verona Posted March 11, 2013 Share Posted March 11, 2013 Because they're high friction as the plates are in contact. Roger King reckons that a normal set of gears and an LSD can reduce power at the wheels by up to 30%. Quote Link to comment Share on other sites More sharing options...
peterg Posted March 11, 2013 Share Posted March 11, 2013 Is that orange line on the graph supposed to be the torque reading? It appears to show a max of 303 lb ft... if so, it's bollix, unless of course it's a 2 litre turbo diesel ;-) Quote Link to comment Share on other sites More sharing options...
FILFAN Posted March 11, 2013 Share Posted March 11, 2013 What about a helical LSD Quote Link to comment Share on other sites More sharing options...
Dave Eastwood (Gadgetman) - Club Chairman Posted March 11, 2013 Share Posted March 11, 2013 Or viscous? Quote Link to comment Share on other sites More sharing options...
dombanks Posted March 11, 2013 Share Posted March 11, 2013 its AB near chester. great place ive been there a few times for stuff. im guessing they did the dyno run in 3rd gear so the graph for torque will be wrong wont it? Quote Link to comment Share on other sites More sharing options...
dhutch Posted March 11, 2013 Share Posted March 11, 2013 Roger King reckons that a normal set of gears and an LSD can reduce power at the wheels by up to 30%. Still unsure about this. Quote Link to comment Share on other sites More sharing options...
Steve_Farrimond Posted March 11, 2013 Author Share Posted March 11, 2013 its AB near chester. great place ive been there a few times for stuff. im guessing they did the dyno run in 3rd gear so the graph for torque will be wrong wont it? That's the one. 3rd gear, I think it's 5th for the torque figure, am I right? Quote Link to comment Share on other sites More sharing options...
robo1968 Posted March 11, 2013 Share Posted March 11, 2013 What about a Quaife ATB LSD? Quote Link to comment Share on other sites More sharing options...
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