eccsmk
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| posted on 7/5/08 at 06:12 PM |
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314 diff
ive posted in RUNNING GEAR that i have found a diff 314 but its £450
is it really worth that much?
im using a 2004 zx12 with a 362 diff but i dont think it will be up to the job i.e. i wont have enough top end speed
ive tried using guides into top speed etc but i dont really understand them
if anyone can help id be a happy bunny
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Hellfire
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| posted on 7/5/08 at 06:19 PM |
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A 3.62 diff will give you about 130mph in sixth gear, which is more than enough for most UK tracks. 3.14 diffs are extremely hard to find and are well
suited for a lot of BEC's and therefore command a high premium. ZX12R is fine on a 3.62 or even 3.38
Phil
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eccsmk
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| posted on 7/5/08 at 06:24 PM |
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cheers phil se i said i couldn't use these speed calculating things i'd got to 100ish
i might stick with the 362 then
just got to finish my airbox then im away
woohoo
forgot to say this car might not see the road i dont think its good enough to sva 
i might buy a new mk chassis a build another for the road
[Edited on 7/5/08 by eccsmk]
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ChrisGamlin
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| posted on 7/5/08 at 07:52 PM |
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FWIW, there were about 3 of them for sale on the Yahoo BEC list a couple of months ago if anyone was after one, Im sure they didnt all sell!
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eccsmk
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| posted on 7/5/08 at 07:56 PM |
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do you have a link please i cant seem to find anything
many thanks
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ChrisGamlin
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| posted on 7/5/08 at 08:53 PM |
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...in my avatar below, as is a speed calculator spreadsheet 
I dont have links to the specific adverts, but if you do a search via the BEC List mirror site over the last 4-6 months you should find them. You
don't need a 3.14 diff with a ZX12 though !
[Edited on 7/5/08 by ChrisGamlin]
[Edited on 7/5/08 by ChrisGamlin]
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eccsmk
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| posted on 7/5/08 at 08:58 PM |
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cheers for that but i dont know how to fill it in to check
sorry im a bit thick
think i got the speed thingy to work
zx-12
3:62 diff
195/50/15
flat in 6th = 130
so im guessong 120 might be achievable
[Edited on 7/5/08 by eccsmk]
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ChrisGamlin
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| posted on 7/5/08 at 09:09 PM |
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Most ZX12 BECs would hit the limiter in top Id think, so you should in theory be able to see 130mph with a long straight. You wouldnt want / need to
go any quicker than that really though, even on the most open of circuits you don't need a car geared for over 130mph unless its got mega power
(turbo etc).
If you're planning on doing lots of road driving though and possibly go touring which may include motorway driving etc, then the 3.14 may be
worth going for, because it will give you better cruising with less revs at a given road speed, although it won't increase your top speed as the
engine wouldn't pull you much above 130mph anyway regardless of gearing.
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smart51
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| posted on 7/5/08 at 09:12 PM |
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I hit 120 in my 1998 R1 BEC at Mallory park. That's the red line in 6th and it was still pulling, albeit slowly. Your ZX12 engine should have
more power so should easily top 120 if geared to 130 max.
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eccsmk
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| posted on 8/5/08 at 06:26 PM |
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thank you folks you've made things alot clearer for me
what im going to do is leave it alone until ive had a proper chance to run it and see how it goes
again thank you
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bazz81
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| posted on 25/4/09 at 08:55 AM |
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hi guys,
Im new here, but i have a mk with zx12 and a 3.14 diff, is this good, or are there better options?
thx
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Hellfire
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| posted on 25/4/09 at 12:34 PM |
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Are you certain it's a 3.14 diff? What's your top speed?
Phil
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eccsmk
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| posted on 25/4/09 at 12:47 PM |
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i'd like to know as well please
as i fitted another 3.62 open diff and on the limiter in top gear is 130 (on a private airfield) or there abouts
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bazz81
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| posted on 25/4/09 at 08:33 PM |
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i dont know the exact top speed as the car is not deliverd yet, i bought the car and will be here next saturday. in the ad the owner said there will
be a 3.14 and topspeed about 225km/h = 140Mph.
http://auto-diversen.marktplaats.nl/kitcars/244221858-mk-indy-kawasaki-zx12r-super-seven-12-500-verkocht.html#photo
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bazz81
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| posted on 27/4/09 at 06:07 PM |
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still waiting, why you ask about im sure i have a 3.14... on the mk zx12.....
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aka Keith
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| posted on 28/4/09 at 07:44 AM |
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I expect that Phil asked if you were sure if it was a 3.14 becuase 1) the are rare and expensive, and 2) it has been known for some more shady sellers
to say that the diff is a 3.14 when they are not.
cheers
craig
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bazz81
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| posted on 28/4/09 at 09:12 AM |
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quote:
Originally posted by aka Keith
I expect that Phil asked if you were sure if it was a 3.14 becuase 1) the are rare and expensive, and 2) it has been known for some more shady sellers
to say that the diff is a 3.14 when they are not.
cheers
craig
Okay, i will see next saturday as the car will arrive then. How can i check the diff ratio, is there a number on it, or do you have a phote where i
can see, how to find out which diff.
Thx!
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Hellfire
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| posted on 28/4/09 at 11:44 AM |
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I'm not saying it doesn't have a 3.14 diff fitted - it may well have - but like aka Keith says, 3.14 diffs are both expensive and quite
rare. I'm also a bit sceptical of some of the other claims made in the advert.
The only sure way to check the diff ratio, is to mark the diff output and input flanges, and count the number of turns on the input, to complete one
full revolution of the output. If it's more than three but less than three and a quarter turns, then you have a 3.14 diff.
Phil
[Edited on 28-4-09 by Hellfire]
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bazz81
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| posted on 28/4/09 at 11:57 AM |
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quote:
Originally posted by Hellfire
I'm not saying it doesn't have a 3.14 diff fitted - it may well have - but like Keith says, 3.14 diffs are both expensive and quite rare.
I'm also a bit sceptical of some of the other claims made in the advert.
The only sure way to check the diff ratio, is to mark the diff output and input flanges, and count the number of turns on the input, to complete one
full revolution of the output. If it's more than three but less than three and a quarter turns, then you have a 3.14 diff.
Phil
Which claims do you mean? The car will be here saturday so i can ask the seller if he can prove it!
[Edited on 28/4/09 by bazz81]
[Edited on 28/4/09 by bazz81]
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Hellfire
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| posted on 28/4/09 at 03:36 PM |
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For starters, the GIPro for the ZX12R doesn't have ATRE built-in, so all the claims that go with it are not quite true. The 0-100kmh time is
also optimistic, as is the weight of the vehicle (purely by looking at the photos)
I could be wrong on the weight, as it can be difficult to judge but to get an Indy to weigh in at 460kgs would take quite a few lightweight parts and
some serious consideration into what parts are fitted. It looks like little/no consideration has been given to the weight of the seats, which is
probably one of the cheapest/easiest areas to reduce weight.
Having said all that, I don't want to deter you from buying the Indy, which may well have a 3.14 diff and weigh 460kgs and be all you expect and
more besides!
The advert may have been written to attract buyers in a difficult market, or maybe to slightly inflate the price of the car. Only you can decide. But
it if you get it for a price you're happy with, I'm sure you won't be disappointed.
Phil
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bazz81
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| posted on 28/4/09 at 04:20 PM |
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quote:
Originally posted by Hellfire
For starters, the GIPro for the ZX12R doesn't have ATRE built-in, so all the claims that go with it are not quite true. The 0-100kmh time is
also optimistic, as is the weight of the vehicle (purely by looking at the photos)
I could be wrong on the weight, as it can be difficult to judge but to get an Indy to weigh in at 460kgs would take quite a few lightweight parts and
some serious consideration into what parts are fitted. It looks like little/no consideration has been given to the weight of the seats, which is
probably one of the cheapest/easiest areas to reduce weight.
Having said all that, I don't want to deter you from buying the Indy, which may well have a 3.14 diff and weigh 460kgs and be all you expect and
more besides!
The advert may have been written to attract buyers in a difficult market, or maybe to slightly inflate the price of the car. Only you can decide. But
it if you get it for a price you're happy with, I'm sure you won't be disappointed.
Phil
Thanks for your feedback, the exact weight is 480kg; before you can get a plate and papers of an import car, it must be weighted at the RDW (kind of
SVA/MOT)
ATRE i dont know but the whole theory about the function is discussed...
The 0-100 km/h is copied of a site, who builds MK's in Holland, if its optimistic, i cant blame the seller, he thought that information was
right. how fast is the car, in your opinion? mention that it is km's and not miles ofcourse!
Saturday i will check the diff. saturday if that right, if not i think we can make a deal about that mistake.
Keep you informed!
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