Subject: Really Really Bad Fuel Consuption Mon Sep 20, 2021 9:42 am
Took mine out today full tank of not new fuel but not so bad to smell of varnish. Only did a 50 -60 mile round trip, though did thrash it plenty. Low fuel warning light started coming on, checked and was nothing sploshing about in there. ....Thats like 20mpg Popped £15 of Super Plus 98ron E5 in there, even though wanted an empty tank to assist removal thought soon thrash that out of ya! So it dont surge like what I would call low speed surging, what it does do at low speeds is sort of clunk to catch up with the revs. Some strange flapping sounds at low speed am like wtf bang on the revs the and it goes away. Almost shit myself at speed, 100plus as unsure how much air is leaking from these spokey wheels. Affects trust in corners these wheels though managed to scrape me right toes. Can't say it ever bottomed out, suspension goes nice and hard at 90plus. No oil leaks and started first time every time. Is it ok to press the button and let the thing start itself with no throttle, tickover is 1250 dead on the nail. I thought the Termignoni had no baffle but met a non rollerised @10k Tenni Green owner who reckoned baffle was still in there. Can I pop the baffle out with no side effects except better sound? Syphoned off a pint of too much oil before riding. Still waiting on a f*cking support stand been over a week now
Subject: Re: Really Really Bad Fuel Consuption Mon Sep 20, 2021 11:03 am
Looks very sweet
You should get better than 43 mpg even caning it.
Don't talk about taking baffles out on this forum as it makes the bike run worse (but noisier) and there are engineers here that dislike mods that make it run worse
mpg can vary a lot with different maps - what map are you running ?? Only ask cos I run a 'riched up' map that Spike got developed on a dyno with his GRiSO & it is somewhere around the 30mpg, but it runs beautifully at low speed with more throaty exhaust. Sometimes I use one of Mark's (Beetle) maps that gives much better fuel consumption but is slightly less forgiving on slow speed corners/traffic.
mpg can vary a lot with different maps - what map are you running ?? Only ask cos I run a 'riched up' map that Spike got developed on a dyno with his GRiSO & it is somewhere around the 30mpg, but it runs beautifully at low speed with more throaty exhaust. Sometimes I use one of Mark's (Beetle) maps that gives much better fuel consumption but is slightly less forgiving on slow speed corners/traffic.
Don't know, could be anything as one of previous owners did a few mods, NKG plug caps, billet torque arm, lots of carbon mods, rollerisation. Bike is quite smooth at low revs running in low gears though there is the snatchy take up of revs when picking up more speed. It definitely moves sharpish. Beats a Suzuki TL 1000 off the lights every time It's agricultural so am very forgiving of the bikes foibles. The fuel consumption am putting down to the poor quality of fuel that was in it, though maybe not. With £15 in the bike and the trip reset will see what I get tomorrow. Am sure I read somewhere Guzzi GRiSO's were thirsty from the factory?
How much in Sterling does it take to fill the GRiSO? It's a deep tank and possible I've got an early activating fuel warning lamp?
You'll need to tune it properly. For that you'll need Guzzidiag and cables or one of the other proprietary tools, a manometer of some sort and read up on how to tune a W5AM Guzzi. Just setting the valve clearances won't cure a high fuel consumption issue.
It sounds as if it has other problems if it's sucking that much fuel. Whip the pipe off and look up its guts. You can see the cat from the front. See if it's horribly clogged. What's the air filter like? If it was over full of oil chances are the airbox has oil in it and the filter is fouled. Don't fill it higher than half way between the 'Add' and 'Full' marks on the stick.
You'll need to tune it properly. For that you'll need Guzzidiag and cables or one of the other proprietary tools, a manometer of some sort and read up on how to tune a W5AM Guzzi. Just setting the valve clearances won't cure a high fuel consumption issue.
It sounds as if it has other problems if it's sucking that much fuel. Whip the pipe off and look up its guts. You can see the cat from the front. See if it's horribly clogged. What's the air filter like? If it was over full of oil chances are the airbox has oil in it and the filter is fouled. Don't fill it higher than half way between the 'Add' and 'Full' marks on the stick.
Air filter is like brand new, box is dry as a bone. As for oil I believe he personally changed it last summer and rode it hardly at all. I syphoned a pint out its reading in the middle on the full low marks. Quite possible the cat is clogged was brown sticky mess at the exhaust exit at the low point on the silencer, is it possible to clean the cat? I would say its running very rich expensively so Am finding it hard to understand what he meant by surging at low speed, I detected no such surging. Ride a suspension bridge with a forced 30mph limit, if a bike is going to surge at low speed it will do it there or the average speed camera section leading into the city, anoither forced 30mph limit.
Buellbloke Nibbio
Posts : 713 Join date : 2021-07-30 Age : 61
Subject: Re: Really Really Bad Fuel Consuption Tue Sep 21, 2021 11:00 am
Pete Roper wrote:
Just setting the valve clearances won't cure a high fuel consumption issue. Don't fill it higher than half way between the 'Add' and 'Full' marks on the stick.
I never for one minute thought setting valve clearances would sort the fueling issues dude. Am thick as shit not dumb as f*ck Its just having had a brain stroke I want to do things in a specific order if I can.
Even after a good 60+ mile run today the oil only registered 3 quarters of the marks on the dipstick. I thought it would expand to the full mark?
An update to yesterday, after using the old fuel filled up with high octane super plus 98ron E5 yesterday. Popped some STP injection cleaner in the tank. Bike did 62 miles and is still almost 3 quarters full. Am thinking what I thought was a full tank yesterday probably was not. Thought filled it up yesterday yet was still room for another 3 litres. Used a degree of restraint and didnt thrash it everywhere at every opportunity. Each time I checked the tank was suprised to see how much fuel was still in there. CanBus is a learning ECM am assuming it didnt like the fuel and needed to burn more to acheive more power I was asking yesterday. Today there was plenty of octane. That said a map is a fixed though editable programme dependant on the O2 sensor for small calibrations. Its narrow band so quite limited on what you can actually do to it I believe. Can the CanBus modify the map slightly to account for poor fueling?
Can one burn off any excessive catalyst deposits by running high revs in say 3rd or 4th like what people do with cars?
The engine runs in closed loop below ~4500 RPM and above 55° C. The ECU only trims on a steady throttle, and it trims it lean or more lean. AFR 14.5 - 15.1. Above 5000 RPM you're in open loop and the the 8V will guzzle fuel flat out like a lizard drinking.
5,000 rpm is the magic number - goes like stink and drinks fuel like there is no tomorrow, exceed that and it's gets worserer.
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Buellbloke Nibbio
Posts : 713 Join date : 2021-07-30 Age : 61
Subject: Re: Really Really Bad Fuel Consuption Fri Oct 01, 2021 6:16 am
[quote="Pete Roper"] You can see the cat from the front. See if it's horribly clogged.
Where you refferring to a cat in the collector/y piece connector pipe or the one I've just discovered in the Termignoni? It's clear that one all the little holes are unblocked, its as dry as a nuns cr*ck So if I manage to move the Termignoni on will I be cat free or is there indeed one in the Y piece?
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Buellbloke Nibbio
Posts : 713 Join date : 2021-07-30 Age : 61
Subject: Re: Really Really Bad Fuel Consuption Fri Oct 01, 2021 5:34 pm
beetle wrote:
No cats in the collector, or midpipe, or y-pipe, or whatever you want to call it.
Thank f*ck for that be ordering a new silencer monday, Mistral carbon hiline is discontinued, only available in stainless. Not sure any of the carbon versions of their pipes are available anymore for the GRiSO. Do like the graphite gasket on the Termignoni but thats all. Assume the cat is there because its a factory pipe, a nicer replacement for the original.
Buellbloke Nibbio
Posts : 713 Join date : 2021-07-30 Age : 61
Subject: Re: Really Really Bad Fuel Consuption Sat Oct 02, 2021 12:54 am
beetle wrote:
No cats in the collector, or midpipe, or y-pipe, or whatever you want to call it.
Will the Mistral Conical Map work for the short version too?
beetle GRiSO Capo
Posts : 10200 Join date : 2013-09-30
Subject: Re: Really Really Bad Fuel Consuption Sat Oct 02, 2021 1:37 am
Buellbloke wrote:
Will the Mistral Conical Map work for the short version too?
. [You must be registered and logged in to see this image.] . In GRiSO we trust! .
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Buellbloke Nibbio
Posts : 713 Join date : 2021-07-30 Age : 61
Subject: Re: Really Really Bad Fuel Consuption Sat Oct 02, 2021 5:53 pm
beetle wrote:
Buellbloke wrote:
Did you know they have cats in those Mistrals?
All E5 and E4 exhausts from Mistral now have cats. They're high-flow cats. I thought the E3 pipes didn't.
They're hand made pipes I wonder if you can request a no cat pipe. E3 pipes probably didnt, in a recent email the guy Alex acted like it was a recent adaption. He did say they were only in the approved version I find these italians are somewhat vague with details, you have to keep asking and emailing Took two attempts to discover they had discontinued carbon on all their pipes. Its funny he went out of his way to approve a new collaboration with UK vendor Moto Corsa and completely failed to mention a long standing association with Guzzibits. Guzzibits still think they can order carbon cans for certain bikes like the Stelvio.
Last edited by Buellbloke on Sat Oct 02, 2021 5:59 pm; edited 1 time in total
beetle GRiSO Capo
Posts : 10200 Join date : 2013-09-30
Subject: Re: Really Really Bad Fuel Consuption Sat Oct 02, 2021 5:55 pm
Subject: Really Really Bad Fuel Consuption 
Mon Sep 20, 2021 9:42 am
but was looking on here