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Title: box ratios. Post by: 67worshipper on April 07, 2008, 22:55:10 pm is a 1.21 4th gear with 3.88 ring and pinion gonna be to revvy for motorway use.im going to run 205/70/15 tyres to try and counteract it. whats the rpm at say 60mph or 90kph gonna be?
Title: Re: box ratios. Post by: Dougy Dee on April 08, 2008, 01:47:34 am My calculator shows:
3000 rpm = 50 mph 3500 rpm = 58 4000 rpm = 67 4500 rpm = 75 Turn the radio up... Title: Re: box ratios. Post by: 67worshipper on April 08, 2008, 14:07:06 pm thats what i worked it out to be as well dougy. a bit steep need to keep the revs down. whats everyone elses cruising speed?
Title: Re: box ratios. Post by: Randy Jewell on April 08, 2008, 20:13:28 pm I have the same tyre size,ring and pinion and a 1.21 fourth gear and at 65mph is about 4000 revs
But acceleration is awesome ;D Title: Re: box ratios. Post by: 67worshipper on April 08, 2008, 20:49:41 pm do you motorway drive it randy? lookin to drive to avon park and santa pod which is 80 and 160 miles away but unsure of driving it.
Title: Re: box ratios. Post by: Randy Jewell on April 08, 2008, 21:21:57 pm Yep, the bug see's regular motorway use like today as it was nice and sunny.
Title: Re: box ratios. Post by: 67worshipper on April 08, 2008, 23:12:34 pm whats your cruising speed then randy?
Title: Re: box ratios. Post by: Peter Roberts on April 09, 2008, 14:21:33 pm Randy cruises at 60 mph , I followed him up to the Volksworld show in my Mercedes Sprinter van , that has a pretty acurate speedo .
He brought the car to work today , as the sun is shining , layed rubber right across the car park 8) (http://www.funkenblitz.com/upload/IMG_9058.jpg) (http://www.funkenblitz.com/upload/IMG_9066.jpg) (http://www.funkenblitz.com/upload/IMG_9063.jpg) Title: Re: box ratios. Post by: 67worshipper on April 09, 2008, 17:46:13 pm its not overly stressed then pete at that speed? nice pair there! n i wasnt even lookin down somebodys top! ;D
Title: Re: box ratios. Post by: Peter Roberts on April 09, 2008, 18:55:18 pm No , 60 is about 3500 , seems fine , depends on how much lift you are running , Randy runs 0.585" , if you go over 0.600" I would probably keep it to 3000 RPM .
Title: Re: box ratios. Post by: 67worshipper on April 09, 2008, 19:19:44 pm im running an fk8 with 1.4 ratio rockers.not sure what the lift is but not as lairy as randys.
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