Improving exhaust note by opening up air box?

Hi beetle,

already heard much of You as a Grio mapping guru, all meant positive. I also had a glimpse to your webiste, but found no appropriate map for the BOS double gun ...?

You don't want to turn the Lambda back on, all you'll achieve is the ECU trying to trim the fuel back to its original horrid state when operating in closed loop.

The 8V is a strange beast. You have to look at it holistically to get the best out of it. The old maxims of 'Open it up and throw fuel at it' won't work.

Pete

Hi Pete,

not sure if I`m right with the follwing:

I could imagine that mapping and sensor are a well tuned team. Simply said, the lambda sensor is measuring a certain value and adapts it to the mapping accordingly.

Therefore, I think a decent mapping does not only spit around with lots of fuel. The skill of an an experienced mapping is to provide the right amount of fuel at certain revolutions and loading conditions. Beetle knows that fur sure   . Roland also has been elaborating this in endless dyno tests. He definitely would not provide a mapping which is not perfect.

So far, I´m fully satiesfied with his mapping and how the engine works. No more jerky behaviour at constant low speed, fine acceleration when pulling the cable, what more do I want.

But let me experiment with the stock airbox with/-out snorkel pulled and lambda on/off. The statements here really made me curious how the engine`s output behaves.

Besides this, I`m not interested on max. horsepower output, my focus lies on high torque over a wide speed range. Or in other words, punch@lowspeed ....

2highlander wrote:

already heard much of You as a Grio mapping guru, all meant positive. I also had a glimpse to your webiste, but found no appropriate map for the BOS double gun ...?

I don't have access to a BOS exhaust, and therefore can't build a map for same.

I would not recommend modifying the intake without modifying the map. Any changes you make will affect how the engine runs, as Roland would have (hopefully) modified the map specifically for the open air box. Also, switching lambda on will be detrimental, as it serves no purpose other than to meet emissions requirements. It is not for performance.

If you are happy with how the bike runs, don't change anything!

Sorry to interject here guys.
I have a brand new 2016 GRiSO. I bought a Termignoni pipe and fitted. W/o db killers it ran like shit (as expected from reading numerous posts). With the db killer in it ran much better (again as expected)
Now from this thread, can I assume that removing the snorkel will improve the breathing without affecting midrange performance and this can be done without a remap?
I am just trying to get it into the best all-round shape without making huge changes.

You'll still need a bottle of snake beetle oil.

Hmmm, pulling the snorkel really is no effort. Simply remove it and try. Tip, heating it up a bit will help.

jonnymac wrote:

Sorry to interject here guys.
I have a brand new 2016 GRiSO. I bought a Termignoni pipe and fitted. W/o db killers it ran like shit (as expected from reading numerous posts). With the db killer in it ran much better (again as expected)
Now from this thread, can I assume that removing the snorkel will improve the breathing without affecting midrange performance and this can be done without a remap?
I am just trying to get it into the best all-round shape without making huge changes.

'Huge Changes' are completely un-neccessary, really. A lot of money is wasted by people on crap that in many cases is actually counter productive. Without slipping a new map into it you won't achieve much by removing the snorkel if by 'Midrange' you mean that 3,500-5,000 rpm area, especially at less than wide throttle openings because in closed loop the ECU will still be trimming the fuel lean in most of that area and that 1,500-ish area is where the VE is worst and, with most pipes, the charge transition issue seems to be greatest.

Remove snorkel, buy cables and download Guzzidiag, slip in Beetlemap after making sure the tune is correct, ride. Very simple, very cheap, very effective.

Pete

Pete Roper wrote:

jonnymac wrote:

Sorry to interject here guys.
I have a brand new 2016 GRiSO. I bought a Termignoni pipe and fitted. W/o db killers it ran like shit (as expected from reading numerous posts). With the db killer in it ran much better (again as expected)
Now from this thread, can I assume that removing the snorkel will improve the breathing without affecting midrange performance and this can be done without a remap?
I am just trying to get it into the best all-round shape without making huge changes.

'Huge Changes' are completely un-neccessary, really. A lot of money is wasted by people on crap that in many cases is actually counter productive. Without slipping a new map into it you won't achieve much by removing the snorkel if by 'Midrange' you mean that 3,500-5,000 rpm area, especially at less than wide throttle openings because in closed loop the ECU will still be trimming the fuel lean in most of that area and that 1,500-ish area is where the VE is worst and, with most pipes, the charge transition issue seems to be greatest.

Remove snorkel, buy cables and download Guzzidiag, slip in Beetlemap after making sure the tune is correct, ride. Very simple, very cheap, very effective.

Pete

Hi , just to add to the discussion. I've recently had my 1200 SE 2012 GRiSO rollerised after it ingested a bucketful of tappet.

I had a beetlemap (designed for the termigoni , baffles in - of course) installed at the same time by Mr Roper which included snorkel removal. I've since then done a fast 300 Kilometre haul in 39 degrees Celsius with 70kg luggage, city crawling in hot and cool conditions, and quick city night rides. It's the bike it should have been from the factory. It runs quieter, cooler. more torque from lowdown to everywhere, has linear power which is much stronger mid-range, is so much more predictable when you ride in a way that requires nuanced power delivery to let you know just exactly where, on a snapped- open throttle anywhere in the rev range, the bike is going to be in the next 2 or 3 seconds (city/suburban environment requires this).  I might have posted similar before but it reminds me of my Le Mans MkII in 1983 which ran so sweetly with accelerator pump Dellortos, when it hit higher end of tacho. Getting this experience just about everywhere now on the GRiSO, proves there is indeed progress.

OK, sounds good. I suppose I will need steering in the direction of where to get all of this. I found these [You must be registered and logged in to see this link.] Is that what is needed? I will also need pointers on the Guzzidiag front and information on how to obtain this 'ere Beetlemap.
I think I can handle removing the snorkel though

Mark has written a comprehensive thread on Guzzidiag here

[You must be registered and logged in to see this link.]

Read, study and inwardly digest then ask questions as required.

For maps? Just click on the link in Mark's sig at the bottom of one of his posts. GRiSO.org or whatever. It'll link you to his site.

Pete