JoaoCaldeira
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 posted on 6/12/05 at 08:24 AM |
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R1: o2/03 or 04/05
Hi all.
IIRC, when the R1 04 model came out everybody looked at the dynos and said it had no torque - or you'd have to rev it quite high.
What is the actual consense on this after real use?
Thanks in advance,
Joao Caldeira
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zxrlocost
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| posted on 6/12/05 at 08:40 AM |
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mate its one of the quickest bikes in the world and best sellers
no bike engine creates that much torque for a kit car thats why youve got to keep the weight as low as possible
but youll love the accelerating
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ChrisGamlin
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| posted on 6/12/05 at 08:51 AM |
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The 04 onwards engine does have less torque below 8k than the earlier engines, but its still going to be more than a blade for example, and the top
end where you'll be when wanting to go quickly will more than make up for it.
The only thing is that the gearbox has slightly closer ratios, so top is a bit shorter, its fine for top end speed because the extra revs still give
you a comparable if not slightly higher top speed, but it would be a bit more revvy when cruising on the motorway etc.
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cossey
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| posted on 6/12/05 at 10:03 AM |
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02/03 engine using a freelander diff and 15"wheels top speed is 149.5 and 70 is 5500 rpm in 6th
04 engine with the same diff and wheels top is 153mph and 70 is 6260.
13" wheels drops top by 3mph and increases revs by ~200rpm
the low down torque can be cured with a well tuned exhaust (the length of the manifold is important but i cant find where i worked it out) and a power
commander. with this you should be able to get rid of the enormous dip in torque.
the only other problem is the sost as 02/03 engines go for £1200-1300 whereas the 04 is nearer £1800 but coming down due to availability.
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ChrisGamlin
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| posted on 6/12/05 at 10:59 AM |
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Yep, that fits in with the figures I did for a 3.54 diff.
The potential problem with gearing that high though is that you also make 1st gear very high, so more clutch slip etc required to pull away. Also
you'll not get near 150mph so I would only consider that gearing if it was purely a road car that you wanted to be a bit more civilised on
motorways and dual carriageways etc
Chris
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smart51
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| posted on 6/12/05 at 06:46 PM |
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From graphs that I've seen, the 2002 engine has more torque in the 3000 - 5000 range, they are about the same after that except that the 2004
will rev for another 2000 RPM giving you the extra 30 BHP.
My 98 R1 will give 120 MPH in top at the redline. With another 2000 RPM it would make 140. Similarly, my 51 MPH in 1st would go to 59.
I would happily have a 2004 engine as I would occasionally  use the extra revs but I don't know that I would pay much more to have one.
[Edited on 6-12-2005 by smart51]
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ChrisGamlin
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| posted on 6/12/05 at 07:36 PM |
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Dont forget though that the 2004 engine is geared differently so if you get 120mph with 98-03 engine, you'd get about 125mph with the 04
onwards, not 140mph
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JoaoCaldeira
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| posted on 7/12/05 at 10:28 AM |
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You can get from US, with shipping costs 04 / 05 complete engines for USD 1700 (and sometimes with rad, cans, exhaust headers...)
But I think that the proven BEC knowledge is in the 98-03, so I'll stick with it (I think )
Joao
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ChrisGamlin
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| posted on 7/12/05 at 10:42 AM |
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That reminds me, from what I understand, the 04 onwards engine has an anti theft mechanism which is quite tricky to overcome meaning the simplest
option is to source an ECU from the US which doesnt have it installed. Maybe one of the breakers like Colin can clarify this?
Chris
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