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arklanOffline
Post subject: why do v8s need different diffs?  PostPosted: Jan 08, 2013 - 03:40 PM
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been doing some reading and one thing i cant understand is.
why do you need to change the diff when going from a v6 or i4 to a v8?
i dont want do put a v8 in anything im just curious as to what the reason is.
my dad says its because v8s rev slower and need a lower ratio diff but iv been reading about v8s and v6s having ratios all over the place.
 
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AdrianBurtonOffline
Post subject: RE: why do v8s need different diffs?  PostPosted: Jan 09, 2013 - 02:25 AM
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It is because the V8 tend to have a torque advantage over the other engines. To take advantage of that you change the ratios to a higher ratio (lower number).

This keeps the engine in its optimum RPM range

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arklanOffline
Post subject:   PostPosted: Jan 11, 2013 - 07:32 AM
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so if i put a v8 in a car that had a v6 or i4 it would rev the guts out of the engine and stuff it?

without changing anything else i mean
 
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AdrianBurtonOffline
Post subject:   PostPosted: Jan 11, 2013 - 01:19 PM
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I means that you may not get the best performance because the engine might not be in the "power". And yes it will rev higher when cruising, but take off faster

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EAMartinOffline
Post subject:   PostPosted: Jan 11, 2013 - 02:36 PM
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There are a number of factors to consider when choosing the differential ratio. First is what RPM range do you want the engine to operate in and how is the vehicle to be driven. Someone who is interested in drag racing will want a shorter ratio like a 4.11-1 for quick acceleration. For a highway cruiser you would want a taller ratio such as 3.25-1. It also depends on what the transmission ratios are. You can have a transmission with shorter ratios in the lower gears for good performance from a start but with a tall over drive for good highway cruising. So while it can be generally stated that a V8 will have a taller ratio than most 4 and 6 cylinder engines there are many variables that can change that.
 
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