6003 replies to this topic

[dablik]

Piggy banks empty chaps.....

[masterbrewer]

Sorry to hear your bike replacement plans have not eventuated, dablik.  

 

Lucky you survived in one piece. 

[Favs]

I hope that you will soon generate enough £££ for a decent 9er Dablik cos there's some Gay Ted roads waiting.......Best of luck to you Cliff.

[Favs]

Renthals which have been idle in the shed for a year fitted & 300mile overnight test ride - initially they feel like cow horns compared to std. Another 300 miles tomorrow will let me make up my mind about keeping them on the bike.

[Studley Ramrod]

Which renthals have you fitted Favs ?

[Favs]

Er um ohh memory failure - starts with a 7 and they are aluminium    - I'll let you know when I see the wrapper again (tomorrow).

[fixitsan]

lubed the levers and cables all round.

[Favs]

As promised ......

 

Renthals are 755-01-Si.

 

I guess they are staying put after today's 300 miles & only rained for the first 120 or so.

[Studley Ramrod]

Cheers Favs.  Thinking of getting some wider bars mesel.

[Favs]

You"ll need to work out where to drill them for switches (4mm diameter (on a 9er), switchgear anti-rotation lugs).

I have a M16x1.5 tap and a blacksmiths drill of the correct tapping size if you need to borrow them for fitting stock bar-end weights to after-market bars.

Edited by Favs, 09 September 2017 - 07:44 am.

[Studley Ramrod]

Cheers for the offer matey, I'll bear it in mind for when I get me noo bars.

[Favs]

On a journey that normally takes 4:25 hours overnight.......... averaging around 67mph (108kph) almost all motorways.

 

Yesterday's day-time, very congested (5:25hrs inc fuel stop) 300 miles run averaging around 55mph (88kph) + a lot of filtering done.

 

Info/figures

 

Rider a svelte 105kg.

 

Bike 2008 900A with GPR cans, Renthal 755, Yamaha +145 screen, handguards & Givi E45 topbox with backrest.

 

Full tank to full tank - on mainstand and filled to around 3mm above filler baffle when settled.

 

Hit reserve at 262 miles, (right under Scotch Corner roundabout), then 19 miles on reserve and used 18.33 litres

 

281/18.33 = 15.330 mpl  to 3dp.  multiplied by 1.609 =  24.666 kpl or 15.330 *4.546 = 69.690mpg for those in the USA used  4.843 US gall = 58.022mpg

 

I can live with the economy.

 

Glad of the Airhawk.

[dablik]

Well Alan them are great figures indeed but, we all know ya consumption is prolly double on a sporty day  

 

Well done on the 105 sveltness, just the same as meself

[fixitsan]

Along the same lines as Favs but with far less detail. (My sveltness is merely 103kg....lightweight gear dontya know   )...as a sanity check of the Samios remap too

 

After brimming to the filler baffle on the centre stand, took a ride into Edinburgh, mucked about with a couple of mates, then headed over the new Queensferry Crossing (lots of filtering), into Fife and then East through Clackmannanshire (mostly 50mph and 60mph roads), and the last 35 miles on the motorway back to West Lothian.

 

The top bar of the fuel gauge dropped after 52 miles (same as usual), the next at 73 miles.

 

 

Total distance covered = 103.5 miles (only top two bars of fuel gauge extinguished so far)

 

Refill at the same pump to the same level = 8.65 litres

 

= 55 mpg 

 

 

Happy with that considering I have 'enjoyed' the remap   (and also considering that today's weather was pretty stormy and windy with a lot of rain)

Edited by fixitsan, 10 September 2017 - 04:05 pm.

[fixitsan]

On a journey that normally takes 4:25 hours overnight.......... averaging around 67mph (108kph) almost all motorways.

 

Yesterday's day-time, very congested (5:25hrs inc fuel stop) 300 miles run averaging around 55mph (88kph) + a lot of filtering done.

 

Info/figures

 

Rider a svelte 105kg.

 

Bike 2008 900A with GPR cans, Renthal 755, Yamaha +145 screen, handguards & Givi E45 topbox with backrest.

 

Full tank to full tank - on mainstand and filled to around 3mm above filler baffle when settled.

 

Hit reserve at 262 miles, (right under Scotch Corner roundabout), then 19 miles on reserve and used 18.33 litres

 

281/18.33 = 15.330 mpl  to 3dp.  multiplied by 1.609 =  24.666 kpl or 15.330 *4.546 = 69.690mpg for those in the USA used  4.843 US gall = 58.022mpg

 

I can live with the economy.

 

Glad of the Airhawk.

 

 

Not bad for a bike which is unarguably more interesting than Honda's 70mpg NC700 .....

[Bjørge]

 

 

Not bad for a bike which is unarguably more interesting than Honda's 70mpg NC700 .....

 

The NC750 runs between 85 and 100mpg..., dunno how they have achieved those figures....

[fixitsan]

 

The NC750 runs between 85 and 100mpg..., dunno how they have achieved those figures....

 

(They got Favs to ride it ......... )

 

 

By having such a restricted inlet system that it makes only 54HP

 

You could have a 1200cc engine run on 26mm pitbike carbs and get excellent fuel economy, plus the bragging rights of saying ' I ride a 1200'

 

They are using a single throttle body and two downstream injectors, probably employing all the tricks in the book to cut fuel here and there when not required, but ultimately (it appears to me) by restricting the peak fuel flow considerably.

 

Another 750, kawasaki ZX750, makes 104 - 109 HP, and returns about 35 - 40mpg (real world use)....but with higher HP comes faster speeds and higher fuel consumption on top....diminishing returns !

 

 

There's a fair spread of mpg results on 'Fuelly' for the NC750X   http://www.fuelly.co...le/honda/nc750x

 

Fuelly results for TDM900 here http://www.fuelly.co.../yamaha/tdm_900

 

 

I suspect there's bragging rights and publicity to be had for the manufacturers too, in terms of mpg  per 100cc capacity... 'proving that large engines can be fuel efficienct'... or something like that.

 

The BMW F800ST returns nearly the same mpg as the Honda NC750x, but at very similar performance levels to the TDM900. (Fuelly for the 800ST - http://www.fuelly.co...ycle/bmw/f800st )

Edited by fixitsan, 11 September 2017 - 08:58 am.

[trevini]

I've just got back from a tour in Germany with a mate who was riding his NC750. Same speeds, same conditions and he was consistently putting less fuel in than me at fuel stops. My best was 64 and the worst 56mpg over about 1200 miles. We only worked his economy out ionic, but it was over 80 compared to my 60 on the same fill up. Whilst it will never set the biking world alight (neither will the TDM), I had a quick ride on it and it's actually a half decent bike. His was bought for commuting, so economy was a factor over performance. As an ex niner owner, he did say he still preferred his old 900. 

[fixitsan]

I've just got back from a tour in Germany with a mate who was riding his NC750. Same speeds, same conditions and he was consistently putting less fuel in than me at fuel stops. My best was 64 and the worst 56mpg over about 1200 miles. We only worked his economy out ionic, but it was over 80 compared to my 60 on the same fill up. Whilst it will never set the biking world alight (neither will the TDM), I had a quick ride on it and it's actually a half decent bike. His was bought for commuting, so economy was a factor over performance. As an ex niner owner, he did say he still preferred his old 900. 

 

 

I think that's always the case, there has to be some compromise, and they've compromised ultimate performance. I remember during my education doing some work on optimum thermal cycles in engines (or something along those lines), where you run engines in different scenarios and often find that despite the extra friction lost through a larger piston ring diameter, a larger cylinder can be run more efficiently sometimes. Heat generation is an issue too, it is easier to keep a lazy lump cool (and it's intakes, essential for good performance) than a highly strung small piston version sometimes making the same power.

 

There is far more too it than that from what i recall, but ultimately you can never have  good power output performance with good fuel economy, that's the main trade off.

 

Last year I went for a ride with my daughter across country, me on the 900 and her on a YBR125, mostly 50 and 60mph roads, no stresses or struggles. When we got back after 85 miles the YBR took 2.3Litres to refill, and mine took considerably more. Therefore if economy is the thing then the YBR is the bike to have !

[JBX]

On a NC750 with the economy mode the gear-up change occurs at 2500rpm.

That plus the 54bhp / intake technology explain a lot.

You may as well ride a YBR or a scooter if only the fuel consumption matters but it will not be a very enjoyable ride.

That said I found that my 9er fuel consumption can vary from 4 to 8 l/100km, the latter figure at illegal speeds.