Moto Guzzi V85 TT

Discussion in 'Moto Bellissima: All Other Dualsports' started by cabanza, Nov 7, 2017.

  1. X1Glider

    X1Glider Long timer

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    The decel popping (after-firing) isn't harmful a least. Only annoying. Only back-firing is harmful (combusting on the intake side). And being a left coaster, you may be more noticeable with that noise to the po-po. That's where blocking the SAS is useful.

    Normally unburnt fuel that gets exhausted out the pipe stays unburnt unless the heat from the pipe ignites it, but it still requires the negative pressure wave in the pipe to draw in fresh air from the exhaust tip so it can burn. The SASs job is to ADD fresh air into the exhaust all the time to help the cat work more efficiently. With all that available fresh air, unburnt fuel from the combustion chamber will now burn in the pipe, so you'll get more of this more often unless you block it all off.

    Mistral and the others that make the Y-pipe should automatically provide the SAS block-off kit to customers, IMO. Or at least, they should write this as a footnote recommendation on the web page for the part and in the installation instructions.
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  2. X1Glider

    X1Glider Long timer

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    Kiwis have learned not to mistake those for sheep from an early age.
  3. borderer

    borderer guzzi 2 shoes

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    Looking at the SAS system I assume that its not a powered device there are a couple of reed valves to prevent blowback and a valve which lets air through, I recon the valve just works by low pressure and the sensor feeds back to the ECU to say its open. I would assume therefore that if the feed pipe from the air filter is blocked then it should basically cut off the system. The only query would be whether the feed from the valve will still mess up the fuelling without a resistor? Any thoughts?
  4. Night_Wolf

    Night_Wolf Leg Humper

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    where is it located & should it be removed :lol3
  5. Night_Wolf

    Night_Wolf Leg Humper

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    As @Jayell pointed out, I apparently removed the EVAP components. To see what was there & how I shoe horned an air horn into the space, click the link in my sig file for the V85 TT Information & look for the Wrenching link in the left frame :deal
  6. X1Glider

    X1Glider Long timer

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    Did you ever put all those removed evap components on a scale?
  7. guzzijason

    guzzijason Been here awhile

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    Apropos of the SAS delete discussion, Todd over at GuzziTech just posted an illustrated how-to on doing so to the V85TT:
    https://www.guzzitech.com/forums/threads/v85tt-gtm-sas-delete.21449/

    Originally, I wasn't planning on doing this when I replaced the slip-ons on my wife's V7III with cat-less alternatives. I naively thought that the closed-loop ECU would re-tune itself, and all would be good. I was wrong. The ECU did in fact self-correct *somewhat* for the new exhaust - the decel popping immediately after the swap was extremely bad, but after riding around for a bit, it calmed down somewhat. It never went away completely, and after a few days I realized I had to do some more investigation into this SAS thing.

    After performing the SAS delete, decel has been smooth like butter. Also worth noting that that bike also got the GTM ECU flash, which had a profound effect - particularly on low-speed throttle jerkiness (I think the stock fuel map has like zero trim on closed throttle, which makes the throttle feel very much like an "ON/OFF" switch at low speeds, which is very irritating to me). Again, that bike is buttery-smooth now. Even moreso than my old V11 Sport, which makes me envious.

    __Jason
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  8. vagrant1947

    vagrant1947 He is free who lives as he chooses!

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    My V85 had deceleration popping even with the stock exhaust. They were just quieter.
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  9. Cal

    Cal Long timer

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    SAM_2931.JPG Night Wolf and I out for a spin in the Alberta Rockies
  10. auto

    auto Been here awhile

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    Thinking about getting a Y pipe. This SAS delete interest me. Was not familiar with it. As for low speed hesitation, I do get a sense of that condition when ridding on an interstate in 6th. My ECM has never been updated at the dealer. If anyone has had their V85 ecm dealer updated where you satisfied with the latest version.
  11. Night_Wolf

    Night_Wolf Leg Humper

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    No point as the air horn weighs more than what I removed :lol3
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  12. Night_Wolf

    Night_Wolf Leg Humper

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    Since I am not adding an exhaust & I don't have that type of cash for a remap; I'll be sticking with what I have. I can live with some decel popping & I don't notice any abnormalities with the throttle response at lower speeds
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  13. Jayell

    Jayell Been here awhile

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  14. Night_Wolf

    Night_Wolf Leg Humper

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    I know Mocc's place really well; met him in NC at an Intruder Rally. He gave me permission recently to copy a bunch of his web pages on brakes for my Intruder site

    Might even drop him an e-mail for his advice. Thanks
  15. Pbro63

    Pbro63 Been here awhile Supporter

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    borderer said:
    Decel popping is caused by the SAS valve

    I see so my next project will likely involve

    1) installing this:
    per @Vagrant1847
    https://gtmotocycles.com/products/g...air-block-off-kit?_pos=1&_sid=7c219811c&_ss=r
    Here you go if you want it right and neat.

    question : So if this stops exhaust popping would / could I still use booster plug? hmmm... I think the freer flowing pipe will still cause a leaner than factory fuel mixture.

    2) remove the evap canister.

    3) gut the tip valve to eliminate the pressure (+ or - ?) that results in a big swoosh of air at times when opening the gas cap.
  16. borderer

    borderer guzzi 2 shoes

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    The ecu will learn about the mixture and auto correct. so for that and lots of other reasons I would avoid the Booster plug. If you really want to get rid of $200 then you can send it to me. Your bike will thank you.
    If you disconnect the battery for 20 min or so the ecu will start its Autolearning from fresh, ultimately wont make any difference but nicer for the first ride.
    still unsure about just blanking off the air intake to the SAS. getting the proper kit is fine but the UK customs are hot on putting crazy charges on anything coming into the country Last thing I bought from Italy had around 30% put on for customs, Tax and various charges.
  17. chethro

    chethro Confidence is High

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    What I did to bypass the EVAP canister.

    1. Remove tip valve and use a brass 1/4" barbed fitting to connect the tank side vent hose to the hose that went to the throttle body. This bypasses the canister. You could still run thru the canister, but I didn't.
    2. Remove the hose from the throttle body and install a vacuum plug on the throttle body.
    3. Then I installed a brass barbed 1/4" tee and connected the old hose from the throttle body which is now connected to the top tank vent to the tank neck drain which now all dumps to the hose from under the battery tray to the ground.

    I have ran 1400 miles with this setup and have noticed no problems so far. Spiders and wasps are bad around here for laying eggs in hoses and plugging them off, so I added a fuel filter to the bottom drain hose too. (There was a sale on clamps, so I used one of every type I had if you're wondering.... :D)

    Hose to the right is drain. Top hose to upper vent. Bottom hose to tank neck overflow? I used the barbed fitting from here in place of the tip valve.

    IMG_3811.JPG
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  18. jrt

    jrt Been here awhile

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    I love the hose clamps. That looks like something I would do.
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  19. jrt

    jrt Been here awhile

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    I added a pair of moto lights to my bike. They are crazy expensive! These came off another bike that I bought and they are designed to clamp onto axial brake calipers. The V85 has radial brakes, so that wasn't an option. They fit remarkably well in the headlight mount though. I chopped up the wiring harness and dressed it into the cockpit/instrument area- it is still a preliminary fit and I'm not really sure I even want to keep them. If I do, I'll probably make longer mounts and drop them down an inch (2.5 cm for our cultured friends) so they don't block the turn signals.
    [​IMG]
    They bolt right into the headlight mounting bracket
    [​IMG]
    I found a relay with a mounting tab, so I put it on the windshield bracket. It is actually quite a good fit, lol.
    [​IMG]
    They are a little wide for my taste- I can probably flip them in the brackets or (more likely) make new ones that put the lights further down and more inboard. Also, the stupid clamp bolt is English thread. It is the only English thread on the bike.
    [​IMG]

    I have no idea how effective they are. I put them on yesterday, and have not ridden at night (I rarely ride at night). And it's going to rain all weekend...
  20. guzzijason

    guzzijason Been here awhile

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    This is only partly true. The Guzzi ECUs are sort of a hybrid - they are only "closed-loop" at lower throttle/rpm ranges, and "open-loop" everywhere else (offhand, I don't know what those cut-off points are). The closed-loop system is designed to help the bike adhere to emissions standards using a specific testing protocol, and NOT necessarily to make the bike run better overall. If you want to get the most out of the motor, especially with the addition of freer flowing intake/exhaust type modifications, your only real choice is a custom map re-flash because the ECU will only be able to do so much on its own.

    __Jason
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