Malossi O2 Lambda Emulator on GTS HPE
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Hooked
Vespa Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 106
Location: Australia
Fri Nov 20, 2020 6:14 pm quote
some observations ...

I had it installed for about 2 months and have temporarily uninstalled for the last several days (will stick it back in soonish).

with installed (not high speed / freeway):

1. lower mileage. 30-32 km/l -> 27-28 km/l This is to be expected

2. more clutch slippage / shudder at lower revs (10-15 km/h in carparks etc)

3. more 'go' when taking off at the lights (with ASR disabled). WIN!


I'm pondering the clutch slippage still. Was able to easily adjust my style. May install a malossi or polini clutch ...

Notes:
* It's a supertech so I can check things like mileage by using the phone app that records the telemetry
* using an Arrow after market exhaust

Last edited by steelbytes on Fri Nov 20, 2020 7:32 pm; edited 1 time in total
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2799
Location: Sydney, Australia
Fri Nov 20, 2020 7:25 pm quote
Lower mileage might be because of the way you take off with the Lambda Emulator installed.

Dr.Pulley HIT clutch is good for locking the clutch and preventing slipping, but this can cause jerks when you open the throttle at low speed. It is expensive. But I don't know anything about tuning the HPE transmission, having only worked on earlier models.
Hooked
Vespa Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 106
Location: Australia
Fri Nov 20, 2020 7:31 pm quote
Mike Holland wrote:
Lower mileage might be because of the way you take off with the Lambda Emulator installed.
doubt this as this should be a minor effect when doing enough kms
Member
2011 LX150ie w/ 190cc Malossi Kit
Joined: 27 Jan 2021
Posts: 5
Location: Istanbul, TR
Mon Feb 08, 2021 10:53 pm quote
does anyone know how the emulator works?
Enthusiast
GTS 300 SS BB
Joined: 03 Nov 2018
Posts: 92
Location: QLD AUS
Mon Feb 08, 2021 11:15 pm quote
durukan wrote:
does anyone know how the emulator works?
I don't know this emulator of yours, but generally speaking, the idea of omitting the Lambda sensor, would be to allow the engine to run richer.

Not sure if the Vespa also has a temperature air sensor on the inlet, but that normally works in conjunction with the lambda sensor.. (not all engines have it).

So, I'm presuming that, that is what your emulator is doing. Is telling the Vespa ECU that either the fuel mix is lean and/or that the air temperature is low..

When an engine run too rich, that is when you get the shudder at very low revs..
But the soon it picks up a bit of rev the acceleration should be much, much better than with the OEM Lambda

Obviously you are getting a fraction lower mileage because you are putting more fuel into the combustion chamber when accelerating..

It is a bit of a compromise, but at least you know it is working as intended..
Hooked
Vespa Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 106
Location: Australia
Mon Feb 08, 2021 11:49 pm quote
The malossi emulator intercepts the o2 lambda sensor from the exhaust only (no air temp)
Enthusiast
GTS 300 SS BB
Joined: 03 Nov 2018
Posts: 92
Location: QLD AUS
Tue Feb 09, 2021 12:08 am quote
steelbytes wrote:
The malossi emulator intercepts the o2 lambda sensor from the exhaust only (no air temp)
That's good. It makes it a lot easier for the ECU to be trick into thinking that the fuel mixture is leaner that what it is..
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Granturismo 218
Joined: 04 Feb 2013
Posts: 6547
Location: NWAOK
Wed Feb 10, 2021 12:20 pm quote
It richens the air/fuel mixture to about 6K RPMs. That's when the Piaggio ECU stops taking in information from the O2 sensor.
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