smart51
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| posted on 9/3/07 at 05:53 PM |
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R1 BEC dyno plot
I had my car on the dyno this afternoon. 152 BHP at the rear wheels is quite nice. The chap said it was leaning gradually out above 6500 RPM which
150 main jets seemed to sort. He said that he was quite pleased with the run as the power builds up nicely and it runs well at part throttle as
well.
I haven't been out on the road in it yet as 5:00 pm rush hour traffic isn't my idea of fun but I'll go out later to see what it's
like
 
Rescued attachment dyno004.GIF
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zxrlocost
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| posted on 9/3/07 at 06:22 PM |
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good stuff mate.
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ChrisGamlin
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| posted on 9/3/07 at 06:38 PM |
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I assume its on carbs, but is the engine stock apart from the usual jets/air filter / exhaust?
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smart51
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| posted on 9/3/07 at 06:52 PM |
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Carbed 98 R1, 4 into 1 with straight through silencer. My own airbox with tuned inlet and cotton filter. The airbox is tuned to 4200 RPM. The idea
is that is smooths the build up of torque, which used to happen suddenly at 5000 RPM. The downside, such that it is, is that torque is made worse
below 2800 RPM.
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roadrunner
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| posted on 9/3/07 at 07:10 PM |
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That's quite impresive from an engine that's supposed to only give 150bhp at the flywheel, what about dyno jets, i've heard this
floating about, is it expensive , and does it give good result's, is there any other way of eaking extra horses from a small engine.
Brad
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G.Man
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| posted on 9/3/07 at 07:36 PM |
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Thats a nice plot...
Of course the dyno results may not be entirely accurate, but it must be way above standard.. No dyno would be more than 10% off surely...
You must be a happy bunny
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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amalyos
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| posted on 9/3/07 at 09:22 PM |
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Where did you get it dyno'd, I've got mine booked in at TTS for the 23rd, will be well happy if I get similar results.
Steve.
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smart51
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| posted on 9/3/07 at 10:15 PM |
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quote:
Originally posted by amalyos
Where did you get it dyno'd, I've got mine booked in at TTS for the 23rd, will be well happy if I get similar results.
Steve.
Hi Tech motorsport, Cradley Heath.
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ChrisGamlin
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| posted on 9/3/07 at 10:43 PM |
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R1s do seem to give out a nice extra chunk of power when liberated of the EXUP etc, but to achieve those figures I do have a suspicion its either had
a bit of stealthy tuning work done on it by the previous owner who's kept it quiet when writing off the bike (Im assuming it came from a written
off bike?), or that Mr dyno is being a bit optimistic.
To compare, my 03 injected engine runs pretty well (12.9s 1/4mile) and is significantly quicker than when i had the carbed blade, yet on the rollers
it "only" showed an indicated 137bhp at the wheels.
Also this thread on the DSR Forums has some dyno results for the
latest breed of 2007 1L engines which on paper are up to 30bhp more powerful than our generation of R1, yet they only record 150-160bhp at the rear
wheel on the dyno.
As mentioned though, its obviously running very nicely regardless of the outright figures, but I think its worth mentioning that 152bhp is more than
you'd expect from your average R1 engine, so others aren't disappointed when they get their own cars on the rollers and only get 140bhp or
so. 
cheers
Chris
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skydivepaul
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| posted on 10/3/07 at 12:18 AM |
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i would suspect either the engine has been tweaked, the dyno is way out or the figure shown is a corrected flywheel figure.
My dynojetted 99 carb'd R1 4-2-1 MK indy manifold gave 125BHP at the wheels. the guy tuning it at holeshot reckoned that was about what you
would expect from a good engine with those modifications.
good power for you though
http://www.smartideasuk.com
http://www.smartmapping.co.uk
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bimbleuk
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| posted on 10/3/07 at 06:27 AM |
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As mentioned already regardless of the final figures the plot shows a healthy engine with a decent torque curve at the top.
The plot formatting looks like it was using the same software as the SUN dyno used at my tuning garage. Which by default is setup to calculate
flywheel figures..
Our Hayabusa engine stroked to 1400cc and using a flowed head, cams, Emerald ECU and free flowing exhaust made 201BHP (so approx 162BHP @ the wheels)
and 116 ft lbs on a similar setup!
As usual the best advice is to use the same dyno so you can compare mods etc
[Edited on 10/3/07 by bimbleuk]
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progers
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| posted on 10/3/07 at 08:51 AM |
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I'm afraid its another vote for an optimistic rolling road calibration.... Unless the plot is showing flywheel figures (or the engine has had
some serious tweaking). However the fact that the fuelling is correct is good and will maximise the potential of the engine regardless. Its well worth
doing.
Just for reference I've just had my recently rebuilt 03 R1 mapped at Powertec (engine arm of Radical in Peterborough) and the peak power was
135bhp at the wheels (~160ish at flywheel). Interestingly the injected power curve is stronger in the midrange (if you compare graph shapes) and peak
power is held on for longer to 11k approx.
Its a shame that so many rolling roads offer optimistic figures, it only makes sense to compare results from the same RR.
Cheers
Paul
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smart51
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| posted on 10/3/07 at 09:19 AM |
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I don't know about any tuning that the engine had before I bought it (from Malc BTW) but I did notice that the inlet tracts on the block had
been honed. It suggests that the previous owner took an interest, shall we say, in the engine. That's not to say that the rolling road
isn't out of calibration. I've heard stories about back to back tests at different stations giving wildly different results. He said it
was power at the wheels. I asked abot flywheel power and he only gave a vague estimate. It was a Sun analyser on the road. Full nerd points to
Bimbleuk for spotting that.
The actual numbers are not as important as the fact that he made me go up a jet size, giving me some more power. It is noticably quicker at
the top end than it was before getting it done which is worth the £82.25 rolling road session to me.
[Edited on 10-3-2007 by smart51]
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G.Man
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| posted on 10/3/07 at 10:05 AM |
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quote:
Originally posted by smart51
I don't know about any tuning that the engine had before I bought it (from Malc BTW) but I did notice that the inlet tracts on the block had
been honed. It suggests that the previous owner took an interest, shall we say, in the engine. That's not to say that the rolling road
isn't out of calibration. I've heard stories about back to back tests at different stations giving wildly different results. He said it
was power at the wheels. I asked abot flywheel power and he only gave a vague estimate. It was a Sun analyser on the road. Full nerd points to
Bimbleuk for spotting that.
The actual numbers are not as important as the fact that he made me go up a jet size, giving me some more power. It is noticably quicker at
the top end than it was before getting it done which is worth the £82.25 rolling road session to me.
[Edited on 10-3-2007 by smart51]
That was my point Smart
The engine looks pretty smooth, with only very minor drop off in the torque curve in the middle, which I am confident a little more tweaking can
improve further..
Looks a good strong motor, I would be well chuffed with that! Accurate BHP or not..
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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Coose
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| posted on 10/3/07 at 06:07 PM |
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Excellent! Your chimberley is obviously better than I thought it was too!
Spin 'er off Well...
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G.Man
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| posted on 11/3/07 at 04:41 PM |
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Smart
as a matter of interest, are you running the MNR manifold? If so, 4:1 or 4:2:1?
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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Bob C
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| posted on 11/3/07 at 05:32 PM |
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Went for a quick blast in mine today - it comes onto the cam (~5k) like being hit from behind with a big hammer... is this normal for a carbed R1? I
have the TTS kit in & it was checked before SVA but has not had any dyno work done.
Bob
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smart51
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| posted on 11/3/07 at 05:36 PM |
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quote:
Originally posted by G.Man
as a matter of interest, are you running the MNR manifold? If so, 4:1 or 4:2:1?
It is an MNR 4 into 1
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smart51
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| posted on 11/3/07 at 05:39 PM |
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quote:
Originally posted by Bob C
Went for a quick blast in mine today - it comes onto the cam (~5k) like being hit from behind with a big hammer... is this normal for a carbed R1? I
have the TTS kit in & it was checked before SVA but has not had any dyno work done.
Bob
That's what mine was like. That's why I made the tuned airbox. It increases airflow due to resonance at 4200 RPM and a few hundred RPM
either side, giving a slow ramp up in power between 4000 and 5000 rather than it all happening suddenly at 5000. The downside is that power is lost
below 2800.
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Bob C
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| posted on 11/3/07 at 06:00 PM |
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Interesting - I've never experienced a belt of power like it - so sudden it's more like an impact! One to watch out for - could be
embarrassing on a corner!
I guess I can see the method in your madness now!! ;^)
Bob
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ChrisGamlin
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| posted on 11/3/07 at 06:25 PM |
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Thats an area where the injected engine gains over the carbed evidently, its mid range is a bit stronger and also the power is delivered a lot more
smoothly compared to the carbed engines.
That benefit probably makes it feel subjectively slower though, a bit like old school turbo engines feeling very quick because of the lag and then
sudden power.
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G.Man
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| posted on 11/3/07 at 09:13 PM |
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quote:
Originally posted by smart51
quote:
Originally posted by G.Man
as a matter of interest, are you running the MNR manifold? If so, 4:1 or 4:2:1?
It is an MNR 4 into 1
Good to know, same as mine, obviously works well...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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