Re-mapped bikes. True mpg?

Betty Swollocks

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For some time I have watched the many threads on here about the Hilltop re-map for the 1200.

I planned to get mine done at some time but the only fly in the ointment was the fact that I live in Northern Ireland... therefore it involved a ferry in the region of £100 plus an overnight stay in a hotel... cost therefore over £500 including fuel.

I was alerted to a tuner in Dublin who was able to do a custom map for my bike on a dyno. Cost was about the same as Hilltop, but without the ferry and overnight.

My bike is a 2010, has flappy valve and cat removed from original pipework. My biggest complaint is that it stalled on downshifting, usually from 3rd to 2nd. (A well documented complaint on this site)

I got the bike re-mapped a couple of months ago. It instantly felt better fuelled and was much quicker through the rev range, although this was evident after the caterectomy I had performed a short time before the re-map. New iridium plugs added after the re-map.

First few hundred miles and the bike got a lot of sharp riding from me, but I noticed the mpg was in the low 40's rather than the low 50's.

I've just returned from a trip through the Alps and have to say I am surprised that the mpg has not improved. I've always been making excuses, blaming the riding style for the low mpg.

But on the last day, I did almost 300 miles.... all motorway and all at about 70mph. The mpg was the best so far, at 47mpg on the computer. On re-fuelling I worked out the miles for a full tank and calculated that the 47mpg figure on the bike display was correct. Normal riding and I'm getting about 43-45 mpg.

The bike did a bit of popping, but that's as much to do with back pressure due to no cat and riding at changing altitudes during my trip. Also, un-burnt fuel fumes are quite strong, and a lot of black deposit around the pannier and rack near the exhaust on the GSA.

Yes I enjoy the new throttle. The bike has not stalled on the down shift in the past 2000 miles, (but it has almost done so on a number of times)

I know the fuel mix has been enriched, I know it was running lean before. But I also hear a lot of riders on here saying their mpg has improved. Mine has definately dropped..... by about 10 mpg.

All I want to know is what about the hilltop re-mapped bikes. What mpg are they returning?


Below is a copy of the dyno chart, which means very little to me. I was told the bike had been very lean before the re-map.

I'd appreciate any comments on the print out, as I have only a basic grasp of what it means.

DynoScan%201_zpsvicsjl9q.jpeg
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Top Marks

Hi
Geoff did my 2011 Triple Black in June, results startling so very smooth and easy to ride, have read other comments about fuel etc mine in fact has improved about 1mpg not startling but but helpful, will need to buy more Tyres though 😱😱😱 it loves corners 👍👍👍👍

good luck +1 Hilltop

KB
 
Sounds to me like your guy has maybe opened the taps a bit too far. I've had 2 bikes hill topped, neither have blackened the rear of the bike or smelt of unburnt fuel and both returned about the same mpg, around 50-52.

Maybe there's a reason he's the only one doing it over here?
 
My old girl has been to hilltop ,and I don't really know what mpg I'm getting as my fuel strip is fucked ,but now the price of go go juice has dropped I really don't give a fook Anyway .
All I know is my bike goes like fuck since I visited Geoff ....and that makes me happy:thumb2:thumb2:thumb2
 
My GS1200LS's been Hilltopped and I get 50mpg according to my bike's computer on A & B roads having fun but not going mad. 100mph on motorways gives around 42mpg
 
Had my RT hilltop a few months ago and it is about 2 mpg better ( 54.3mpg according to the computer ). I also get blackening around the exhaust but only a small amount. The chart you have is the same as the chart hilltop use and its interesting to see that the fuel/air ratio is virtually identical to other seen on here.
 
My 2007 gs hasn't been Hilltoped as far as I know and rarely reterns more than 42mpg according to the computer. I've just come back from a 1400 mile tour of the highlands and the best I got was 43mpg. I wonder if a remap will help.
 
That standard air/fuel reading looks iffy. With a bike running that lean I'm surprised you could pull off let alone ride it. The after reading is bang on the money but I notice the text says no Lamba. Has it been changed to open loop?
 
10mpg worse off! Typical consumption should be 45mpg - so that is a huge percentage.

I wonder what the A/F ratio would look at below 3000rpm. Strange that he hasn't recorded that?

It looks a bit suspect, to be honest.

Al
 
That standard air/fuel reading looks iffy. With a bike running that lean I'm surprised you could pull off let alone ride it. The after reading is bang on the money but I notice the text says no Lamba. Has it been changed to open loop?

I'm not techy enough to understand what changing the Lambda to open loop means.

What would be the advantage or disadvantage if doing this? Is it something I need to ask the tuner about?
 
10mpg worse off! Typical consumption should be 45mpg - so that is a huge percentage.

I wonder what the A/F ratio would look at below 3000rpm. Strange that he hasn't recorded that?

It looks a bit suspect, to be honest.

Al

Al
My consumption was better than 45, more like 52 before remap. Now doing 42 ish. Not far away from your figure, but a lot less than I was getting.

Don't get me wrong, it runs a lot better, but I'm wondering if it's too rich now.
 
That standard air/fuel reading looks iffy. With a bike running that lean I'm surprised you could pull off let alone ride it. The after reading is bang on the money but I notice the text says no Lamba. Has it been changed to open loop?

Rob, my thoughts exactly. The standard AFR line is just not possible, period. And the soot, fuel smell and MPG all suggest disconnected O2 sensors.
 
I'm not techy enough to understand what changing the Lambda to open loop means.

What would be the advantage or disadvantage if doing this? Is it something I need to ask the tuner about?

It means the O2 sensors have been unplugged. The connector location is below the cylinder heads.
 
I'm working and not home till Monday. Will have a look.

I guess it could also be one or two defective sensors.
 
Whatever your mileage was before, this "adjustment" is 20% worse............... that's a hell of a lot!

Could it be that the fuelling has been enriched right across the range, with a fairly broad brush - something akin to introducing a resister to the air temp sensor?

Looks like the llamda sensors have been disconnected?

Al
 
I'm working and not home till Monday. Will have a look.

I guess it could also be one or two defective sensors.

That wouldn't show on the graph.

At that air/fuel ration shown on your graph the engine would just cut out. If they left it unfitted and hanging in fresh air it would show 20.7 so it looks like they didn't have the sensor fitted making your before plot meaningless from an af point of view
 
Just back from a 2000 mile European jaunt on my Hilltopped 1200 GSA 2009. Average mpg for the whole trip on the computer thing 50.3mpg. I manually worked out a few tankfulls and was getting 56mpg on A road cruising (two up and loaded) and 46mpg at 80 on the motorways..

hope this helps
 
Mine has a Power Commander which greatly improved the bike but is running rich (I will eventually get it dyno'ed) Fuel consumption is low 40s mpg on short local runs but around 45 mpg on long runs. It used to be high 40s on long runs. Ive only seen more than 50mpg if I ride very gently or with a pillion (=same thing).
 
49.5mpg on the 'puter for PCV with custom map and since its been Hill Topped. Not surprising as the end result graphs are almost identical. (The PCV is available if anyone wants one for a TC.)
 


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