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Old 08-03-2010, 12:58 PM   #1 (permalink)
TBM
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Default Which Diff

Is a 4 to 1 diff ,going to be the best diff for drag racing , street meet , when only running 150 xu1 carbies , on a 186 with good cam and head ,and 4 speed.
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Old 08-03-2010, 01:09 PM   #2 (permalink)
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it depends what box you run

most drag racers use 4:11's

but to me seem very impractical on the street due to the idea is to hit full rpm at top gear over 400m and what i mean by full rpm is not a limeter it is the peak rpm of the power band
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Old 08-03-2010, 01:20 PM   #3 (permalink)
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I'm running an M20 ,and will only use the diff for the day .
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Old 09-03-2010, 03:29 PM   #4 (permalink)
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what tyre size & what revs do you want to cross the finish line ?
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8.81 @ 154 on radials with more to come

8.77 @ 155 & still more to come

all throttle no bottle / all steel & glass
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Old 11-03-2010, 04:55 PM   #5 (permalink)
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PM has been sent.
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Old 11-03-2010, 05:44 PM   #6 (permalink)
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what sort of mph do simillar cars run ?
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8.81 @ 154 on radials with more to come

8.77 @ 155 & still more to come

all throttle no bottle / all steel & glass
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Old 11-03-2010, 06:39 PM   #7 (permalink)
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In the book 186 XU1 , 16.1 seconds ,Bathurst 186 XU1 , 15.6 average ,best 15.1 but no terminal speeds listed.
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Old 11-03-2010, 06:46 PM   #8 (permalink)
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86 mph is what it works out , so 6500 rpm across the line you need somewhere between 5.1 - 5.3 gears

hop this helps
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Old 11-03-2010, 07:36 PM   #9 (permalink)
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It looks like I used the wrong words (best diff) I have been offered a 4 to 1 , should I use it ? it has a 3.08 to 1 , in it now ,and would still be in third across the line .
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Old 11-03-2010, 09:25 PM   #10 (permalink)
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Quote:
Originally Posted by TBM View Post
It looks like I used the wrong words (best diff) I have been offered a 4 to 1 , should I use it ? it has a 3.08 to 1 , in it now ,and would still be in third across the line .
hi if thats all you got to choose from. it will be alot better than the 3.08 diff you got. throw it in and try it you cant go wrong. post up your results.mph and rpm etc. good luck
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