Nick Davison
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| posted on 4/8/11 at 08:30 AM |
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Gearing
As a point if interest what sort of top speed have people geared to with their cars (with respect to RPM v MPH in top) - ok understanding that BECs
will be doing 200k rpm at 30mph?
I am doing about 95 at 4000rpm.
Nick
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steve m
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| posted on 4/8/11 at 08:33 AM |
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Mines more like 85mph at 6000
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franky
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| posted on 4/8/11 at 08:47 AM |
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3000rpm@70mph
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flibble
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| posted on 4/8/11 at 08:48 AM |
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About 3500rpm at 80mph
limiter set at 7000rpm
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snapper
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| posted on 4/8/11 at 08:52 AM |
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80 mph @ 4000 rpm in 5th
3.9 diff, 185-50-14 tyres
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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adithorp
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| posted on 4/8/11 at 09:27 AM |
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Geared to 13,750@70+... in first, or 6500 in top. Max just under 150.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Nick Davison
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| posted on 4/8/11 at 09:55 AM |
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I have just done a quick calc using my tyre size of 215/40/17 and my final ratio comes out at 2.977:1.
This gives me a final top speed (theoretical) at 5500 RPM (Top of torque curve) of 130mph providing the power and aeros will let it get there.
This is a good calculator: http://www.kouki.co.uk/utilities/visual-tyre-size-calculator
Nick
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coozer
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| posted on 4/8/11 at 11:26 AM |
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Mine went to 140mph at 7200rpm on the RR. That was a 3.62 diff with it in 4th - ratio 1:1
I've since changed it for a 3.92 thats made it a lot more lively and so far I've seen 128mph....
1972 V8 Jago
1980 Z750
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bj928
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| posted on 4/8/11 at 12:34 PM |
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mine is geared for about 338mph in top (never get there, but is a result of axle ratio and .5 overdriver ratio in 6th, and gearing for 60+ in 1st) so
70 would be about 1200rpm, 61 mph in first, almost 600lb/ft so should just about pull the gearing at all speeds i have the balls to use it at, but
then that was with old engine
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