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 Improving exhaust note by opening up air box?

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1151
Sfregiato
Sfregiato


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Join date : 2014-05-23

PostSubject: Improving exhaust note by opening up air box?   Thu Nov 03, 2016 1:48 am

Hey all,

As I will be using the oem exhaust on the GRiSO for some time to come now that I have updated the map with one of Beetle's designed for that pipe, I am wondering if opening the airbox may add a slighhtly meatier grunt to it's note as shown in this video. If so, are there any drawbacks for the engine in doing this or should it be safe?

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Thanks,

1151

Beetle, if you read this, I will post again soon with my thoughts on the map you created and sent to me last year for the oem can / rollerized GRiSO.

For now let's just put it this way - cheers
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Pete Roper
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Age : 59

PostSubject: Re: Improving exhaust note by opening up air box?   Thu Nov 03, 2016 2:22 am

You won't change the exhaust note. What you will do is increase the intake roar. Thing is that buggering about with the intake is, basically, counter productive performance wise. Yes, if you are only interested in peak HP and couldn't give a shit about fuel economy or a decent torque curve you can open everything up to the max and turn it into an incredibly wasteful and inefficient pump rather than just a moderately wasteful and inefficient one. It will be loud as a very loud thing and have an awesome top speed but it will also be a complete pig to ride!

Mark's maps are all built for the stock airbox and filter and in the case of the GRiSO the snorkel on the airbox is removed. If you change things from those specs efficiency and performance will be sub-optimal.

From a personal point of view I find the intake *Honk*, (I can't hear my exhaust with ear plugs in.) quite satisfying and wouldn't want anything louder. Do bear in mind though that my dislike of almost anything noisy is well known and I have been labeled a 'Grumpy Old Man' by at least one panel of internationally renowned experts!

Pete
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1151
Sfregiato
Sfregiato


Posts : 438
Join date : 2014-05-23

PostSubject: Re: Improving exhaust note by opening up air box?   Thu Nov 03, 2016 11:49 am

Thanks Pete, I appreciate your feedback. I didn't know the snorkel should not be in when using Mark's map. I'll pull it prior to my ride today or tomorrow.

At least you are not considered a Grumpy Old Sheila  Laughing
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Oz1200Guzzi
Don Abbondio
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Age : 62

PostSubject: Re: Improving exhaust note by opening up air box?   Thu Nov 03, 2016 2:15 pm

Tee, Hee. From memory, mine could be considered "too" loud, so I try and run at the back of the line of bikes - unless there is an awesome chance of overtaking someone and scaring the bejesus out of them. I can't catch Pete anyway because his bike has far more mid range than mine as well as double the valves.

Incidentally, removing the snorkel allows a slightly better midrange, with associated induction roar, and this applies to all the later 1100s, 1200s (2V) and the 1200s (8V) - probably there for EURO something initially...
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1151
Sfregiato
Sfregiato


Posts : 438
Join date : 2014-05-23

PostSubject: Re: Improving exhaust note by opening up air box?   Thu Nov 03, 2016 5:31 pm

Just got back in from an afternoon run. I removed the snorkel and immediately noticed the increase in the exhaust roar right off the bat in the midrange as mentioned thru the gears. Not quite a Termi or Zard etc. but it is louder than before and I think pretty well perfect at this point.

I also felt that the bike wanted to accelerate a little easier and or quicker? Not 100% sure on that but that was my initial impression as I set off and hit the hwy..

Damn happy with the way the bike is running and sounding now! Thank you both for the feedback and tips!
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Steak
L'Innominato
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PostSubject: Re: Improving exhaust note by opening up air box?   Fri Nov 04, 2016 1:58 pm

I like my snorkel...

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2012 MOTO GUZZI GRiSO 1200SE

2013 MOTO GUZZI STELVIO 1200NTX - Orange Blossom Special
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cytocycle
Tanabuso
Tanabuso


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Join date : 2013-07-02

PostSubject: Re: Improving exhaust note by opening up air box?   Tue Jan 17, 2017 12:07 pm

I am running just a open BMC filter and no top on the airbox and the intake roar is great, I did have to adjust for the extra air.  I am very happy with the result and I didn't notice any loss in torque, but did notice a much faster revving to redline.   I wouldn't remove it unless you are going to adjust the fueling.

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Pete Roper
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PostSubject: Re: Improving exhaust note by opening up air box?   Tue Jan 17, 2017 12:36 pm

Sigh.....
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wardentm
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PostSubject: Re: Improving exhaust note by opening up air box?   Tue Jan 17, 2017 2:12 pm

My old man once said to me with some gusto when I was a fiddling youngster,

Why fix it if ain't broke ??

Have a great day
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AH Head
Tanabuso
Tanabuso


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PostSubject: Re: Improving exhaust note by opening up air box?   Wed Jan 18, 2017 10:00 pm

Pete Roper wrote:
Sigh.....

Hey Pete .......... remember my nightmare with my Tenni.
After drinking massive amount of the bogus cool aid( read money ) I put it to the Dyno....... you were right. showed less horse power...more noise and a shit load of fuel burn. Sad
Wont be repeating that to any of the herd any time soon that's for sure... Uhgg

Ciao
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LBC Tenni
Nibbio
Nibbio


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PostSubject: Re: Improving exhaust note by opening up air box?   Wed Jan 18, 2017 11:45 pm

Oiled media filters?

Simple science says no bueno:

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ghezzi
Fra Cristoforo
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PostSubject: Re: Improving exhaust note by opening up air box?   Thu Jan 19, 2017 12:06 am

I look at the title - Improving exhaust note by opening up air box? - and think, how is that even possible?


wardentm wrote:
My old man once said to me with some gusto when I was a fiddling youngster,

Why fix it if ain't broke ??

Have a great day

My ol' man used to berate me all the time coz I couldn't leave my bikes standard.
Then one day I was looking at his armoury and noticed something, not one rifle was standard.

He'd make his own stock and fore end with custom cheek piece, add a Leopold 3x9 variable scope blah blah blah.
So I asked him. "Hey Dad, you bed the action and float the barrel for accuracy, right"? "Yes"
"And you re-chamber for a bigger cartridge with a lighter projectile for greater muzzle velocity, right"? "Yes"
So how is that any different to my better suspension, brakes and big-bore kit"?
"Shut up smartarse"!
jocolor  I win.
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beetle
GRiSO
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PostSubject: Re: Improving exhaust note by opening up air box?   Thu Jan 19, 2017 2:03 am

I must have been in a coma when 1151 posted this.

Pulling the snorkel helps the mid range as VE on the 8V is less than stupendous between 3300 - 4800 RPM above ~15% throttle. Removing the air box lid and adding a rock strainer air filter requires adding beaucoup fuel to compensate. Of course this also does wonders for the inherent charge transition issue by not helping one bit. We really want to mostly slow down intake speed above and below the poor VE area for the aforementioned transition snafu. Adding an open exhaust just makes things worse.

Yep, push the (less) peak torque up the rev range and wallow in your intake roar. Meanwhile, the GRiSO's with a proper map and a stock snorkel-free air box are already in the next town before you shift down two gears to try and catch up.
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waterbottle
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PostSubject: Re: Improving exhaust note by opening up air box?   Thu Jan 19, 2017 2:30 am

I love the stock stelvio pipe growl up at 8K Twisted Evil
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Converted Duc
Grignapoco
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Join date : 2014-12-16
Age : 52

PostSubject: Re: Improving exhaust note by opening up air box?   Thu Jan 19, 2017 12:41 pm

I find the best way to improve the growl when the GRiSO is switched on is to say I am going for a ride when the misus has something 'better' for me to be doing. Works a treat every time, although sometimes it can turn into a banshee like wail if i do it two days in a row Smile
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Bulldog9
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Join date : 2016-05-14

PostSubject: Re: Improving exhaust note by opening up air box?   Yesterday at 9:04 pm

You mean 'intake roar' unless you fart out of your mouth............... Shocked


1151 wrote:
Just got back in from an afternoon run. I removed the snorkel and immediately noticed the increase in the exhaust roar right off the bat in the midrange as mentioned thru the gears. Not quite a Termi or Zard etc. but it is louder than before and I think pretty well perfect at this point.

I also felt that the bike wanted to accelerate a little easier and or quicker? Not 100% sure on that but that was my initial impression as I set off and hit the hwy..

Damn happy with the way the bike is running and sounding now! Thank you both for the feedback and tips!
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Papa Lazarou
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Age : 62

PostSubject: Re: Improving exhaust note by opening up air box?   Today at 3:00 am

Me,. I just attach cards to the spokes.
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PostSubject: Re: Improving exhaust note by opening up air box?   Today at 9:32 am

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