smart51
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| posted on 23/2/06 at 09:05 PM |
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R1 torque curve
I've just been looking through my R1 haynes manual and have found a torque curve graph. It shows a flatish 90 Nm from 3500 to 5000, a bit of a
dip to about 80 and then a smooth rounded hump peaking at 108 around 8000 droping back to 80 at 11000.
My car feels much different from 3000 to 5000 there seems to be half to 2/3 of the peak then from 5000 on it rockets forwards up to the red line.
Is this normal for an r1 BEC?
I kind of miss the torque in the 4000 rpm range. why has it gone and how do I get it back?
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Hellfire
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| posted on 23/2/06 at 10:13 PM |
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Have you had it set up on a rolling road yet?
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Winston Todge
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| posted on 23/2/06 at 11:04 PM |
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Just in case you were curious here's a comparison of a few torque curves...
http://www.mnrvortxr1.co.uk/files/R1vsMille.jpg
Chris
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smart51
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| posted on 24/2/06 at 08:40 AM |
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I was going to get it rolling roaded but the rolling road at TTS was closed for maintenance every time I rang them.
I fitted their carb jetting kit and tried almost all of the combinations of main jet size and needle groove. Only 1 combination was good at all
engine speeds / throttle openenings. settings that were close gave hesitations either at large throttle openings or medium and large throttle
openings. settings that were further away were awful at any engine speed over 3000 and any throttle opening above about 20%. The worst settings
produced a really loud vibrating noise that was louder than the engie and exhaust added together.
Given that I have tried [almost] all the possible settings and that only one setting is any good, what can a rolling road do?
Interestingly, will all the usable jet settings and even with the stock jets, the under / over 5000 RPM behaviour has always been the same.
Dave, your xls sheet is close to the chart shown in haynes, except haynes is a bit more smooth. I was describing torque as shown in the updated
sheet. The data was as tested by MCN and so is lilely to be at the back wheel.
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progers
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| posted on 24/2/06 at 08:52 AM |
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Rolling road
I would still recommend going on a rolling road as thats the only way you can analyse what the air/fuel ratio is doing through the rev range.
In my experience the carb'd R1 has a flatspot around 5-6k which is almost impossible to get rid of. It should pull OK at lower revs though.
Fundamantally the carbs are set up to deliver performance at 7-11k.
I've just had my injected R1 mapped at Powertec (Radicals engine prep firm in Peterborough). Power achieved is no more than the carb'd
setup I had previously, but the midrange was much, much smoother. I now have 90% of peak torque available between 5.5 and 10.5K. Nice :-)
Cheers
Paul
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smart51
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| posted on 24/2/06 at 09:09 AM |
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I'm still thinking about taking it to a rolling road but I can't see what improvements they can make as all other needle settings are
subjectivley worse than the way I have it now. I still might get it done.
There is no noticable flat spot at around 5 or 6k, from about 5000 and up it pulls quite smoothly. If I let the revs drop to 4000 or lower then
acceleration is lower until 5000, then it takes off.
attached is my impression of the torque curve, given quoted peak torque and peak power figures.
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zxrlocost
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| posted on 24/2/06 at 01:26 PM |
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colin the rolling road isnt just about improvements its about seeing whats wrong aswell
get it booked in
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ChrisGamlin
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| posted on 24/2/06 at 05:24 PM |
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I suspect the slight mid range flatspot is probably due to the lack of EXUP valve which has a main priority in life to boost mid range punch, albeit
probably at the expense of a couple of top end ponies.
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