TBO240 Member 628 Member For: 21y 6m 22d Gender: Male Location: Geelong Posted 24/03/05 09:47 PM Share Posted 24/03/05 09:47 PM I dare anyone to prove this wrong - mathematically of course.Go for it Brian!! <{POST_SNAPBACK}>http://home.planet.nl/~monstrous/tutcar.htmlto much for me but might help someone Link to comment Share on other sites More sharing options...
Geeseman Donating Members 1,805 Member For: 21y 4m Location: Sydney Posted 20/04/05 11:09 PM Share Posted 20/04/05 11:09 PM Any more news on this? Has anyone dynoed their car with smaller wheels and noticed a difference? Link to comment Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 19y 10m 20d Gender: Male Posted 21/04/05 12:17 AM Share Posted 21/04/05 12:17 AM Do wheel sizes affect the dyno result? I mentioned that they do to Scotty last year and he pissed himself laughing. Would like to hear from people who:1. ARE dyno experts2. HAVE had their cars dyno'd, especially if on 2 different wheel sizesMy car was tuned to 333rwkw on 17 in tyres. Fitting the 19's showed the power figure to be 310 rwkw.I had the power de-tuned back to 310rwkw on 17's. A recent dyno with the same power level on my 19's showed the power to be 285rwkw.Have others found the same thing? If so, for brag value, obviously everyone will be quoting power figures from dyno runs with smaller wheels?Would appreciate a discussion on this.<{POST_SNAPBACK}>They definatly do buddy.Increase the diameter therefore increase travel therefore decrease the time it takes to make a revolution.Gearing also effects dyno results in the same way increase 3.46 to 3.73 shows a non existent horsepower increase also this works in reverse when you decrease.Dont let anyone tell you otherwise this is a fact!Dynos that work of the actual wheel hub\diff do not have this issue with wheelsRegards Spiro Link to comment Share on other sites More sharing options...
JB Forum Superhero Donating Members 3,109 Member For: 21y 3m Location: Eastern Suburbs of Mexico Posted 21/04/05 01:14 AM Share Posted 21/04/05 01:14 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw Link to comment Share on other sites More sharing options...
Cobra potty trained Lifetime Members 1,938 Member For: 21y 10m 2d Gender: Male Posted 21/04/05 01:22 AM Share Posted 21/04/05 01:22 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw what about when you got the 5's on ?? Link to comment Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 19y 10m 20d Gender: Male Posted 21/04/05 01:22 AM Share Posted 21/04/05 01:22 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw <{POST_SNAPBACK}>I failed to mention that you can adjust the dyno to compensate!Provided that they know how. Link to comment Share on other sites More sharing options...
sutty Mushroom Donating Members 799 Member For: 20y 9m 12d Gender: Male Location: THORNLANDS, QLD Posted 21/04/05 01:24 AM Share Posted 21/04/05 01:24 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw Yes, but what are the tyre profiles? You may find that the diameter, including the tyre, is very similar for both the 19's and the 17's?? Link to comment Share on other sites More sharing options...
JB Forum Superhero Donating Members 3,109 Member For: 21y 3m Location: Eastern Suburbs of Mexico Posted 21/04/05 01:29 AM Share Posted 21/04/05 01:29 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw I failed to mention that you can adjust the dyno to compensate!Provided that they know how.Dyno settings were not touched. Link to comment Share on other sites More sharing options...
JB Forum Superhero Donating Members 3,109 Member For: 21y 3m Location: Eastern Suburbs of Mexico Posted 21/04/05 01:30 AM Share Posted 21/04/05 01:30 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw Yes, but what are the tyre profiles? You may find that the diameter, including the tyre, is very similar for both the 19's and the 17's??Must be the only explanation........... Link to comment Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 19y 10m 20d Gender: Male Posted 21/04/05 01:31 AM Share Posted 21/04/05 01:31 AM Dynoed mine on HPF's dyno with my factory 17's on, 305rwkw.Dynoed on HPF's Dyno with my 19's on, 305rwkw <{POST_SNAPBACK}>I failed to mention that you can adjust the dyno to compensate!Provided that they know how.<{POST_SNAPBACK}>Dyno settings were not touched.<{POST_SNAPBACK}>that's impossible!What dyno make and model? Link to comment Share on other sites More sharing options...
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