The comprehensive GRiSO exhaust thread....

Grisonut wrote:

Well, finally got my slip on today...
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Nice piece really, but why the fuck does it have to be so close to the turn signal for one thing and not even the soft panier bracket will bolt on with it for second. Dumb asses!! It's not like there isn't enough real estate.
Anyway I will fabricate an intermediate pipe that will place the exhaust tip not only lower but also not as far back.
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I do like the sound of it. Not loud at all with the db killer, just a nice hooligan rumble.  

I just ordered one of these today! Boom shaka laka laka!  

Great.
But have someone modify the connecting pipe so you don't melt your signal at least.
I did mine in a way that I can use my Givi hard bags.
It's basically located where the OEM was.
I will post pics in a bit for you...

Here you go:

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I made another cut (not shown in pic) to angle the pipe down so it clears my bags bracket, that's why you see a second weld bead.
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Here's the finish look. I also improvised a bracket to attach the muffler at the OEM ppoints.
I will re-do said bracket in stainless steel, just didn't have time yet...
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You do good work Pascal!

  

Thank you.
I did all the engineering of the pipe but I had a local guy welding it for $40 as I don't have a TIG (needed for stainless).
I even indexed it for him so it was dummy proof.

I'm happy with this slip on.
I'm losing a bit of torque at about 2500rpm but the bike breathe so much better at about 4000rpm and above.  

My stock 1100 with stock pipe does not do well at 2500.
You don't want/need to be that low anyway. 3000 is OK.
You are not missing much with issues at 2500. Spin it up!!

I have to share these pics.
It would seem its very hard to get a large V-twin exhaust that works.
Have a look at this Suzuki 1000. Run-around circuits restricter valves.
The GRiSO is a work of art compared to this.

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Function over form. Look at that O2 sensor stickin out like dogs balls.



Then again it probably goes like a shower of shit with perfect fueling. Oh, and has a nice meh whine.


  

I have fitted stainless steel Mistral to my bike. Sounds nice, but the vibes have dialed in after installation

Waiting for Carbtune to arrive, and hopefully with a little bit of help from this forum the vibes will be reduced. If not, a DB killer goes in. [You must be registered and logged in to see this image.]

I think I'm going to go with the Quat D on my 1100. Short enough do that my HB Juniors are in the clear.

Any clue if I will have to mess with fueling?

Had a Quat D on my now departed 4 valve GRiSO and ran it with the db killer and Catalyst supplied, never had a problem with fueling so should not be an issue with your 2 valve engine. They are a great bit of kit and I would have put one on my new (used) Tenni but it already has a Mistral so I can't justify the money.
Mark

I like the Quat-D a great deal. It looks great on the GRiSO and it has a nice bark. I ran it on my 1100 without issue, but it ran even better with the PCV/AT set up. FreshEgg here in the ghetto is running the Quat-D on his 1200 8V without any issues and I think he's got one of Mark's maps on board.

It's a good pipe, remapping is not necessary, but it will run better if you do remap.

speaking of not needing to re-map.........
I just unwrapped the Agostini slip-on I got from a very cool ghetto member.
Does anyone know if this is similar to the Quat-D for my 1100??
Can I just put it on and have run OK??

Yes, I do want to do a remap but if the Ago can requires re-mapping then I will leave it off until I get the bike somewhere that can re-map for me.
Thanks for any input.

DM

Holy Butt-Crack Batman!!
I just started snooping around my GRiSO exhaust mounting and I found a CRACK half way around the snake piece that rubber mounts to the swing arm pivot.

WHY do you mount an exhaust to a pivoting piece????????????????

Harumph!!

This was a common issue with early 1100's. The factory revised the bracketry.

Pete

Well, well, well.
That is very interesting.
I am planning on taking my 1100 to Pro Italia for some service in a couple weeks.
I will call them and see what they have for the revised bracket.

I am still presuming that my Ago can (with db killer in place) does not NEED remapping?

DM

Status Report.

Agostini Can on 1100 GRiSO.

OMG!!!!!
What a Peach!!!!
That motor LOVES that can.
My bike is smoother and more pleasant to ride and more effortless spinning up.

Thank You so very Much Grant.
I can't believe how much better my bike looked when I was at the gas station walking back out to my machine. It was sublimely gorgeous.
I am very pleased with the Agostini can. It is wonderful.

DM

Ad B wrote:

Hi,

beetle wrote:

Mwahahahahaha!
It's mine!
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And mine...
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I made a db killer myself, the Original one cost me 10 Hp   ...

beetle wrote:

It's pretty but it won't solve the poxy stock mapping issue. If you used one you would need a can with extra pipe like the Mistral Hi-Pipe and be sure to use the dB killer. You might get away with that, but I aint betting the farm.

The assymetrical headers are a thundering nuisance as far as fueling is concerned, but if you were to go symmetrical you would need to move the oil cooler, and I loves me oil cooler where 'tis.

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I didn't like that oil-cooler lump at the right side as I didn't like the asymetric headers.   

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Stelvio headers and crossover, which I modified to make my Mistral High Rise fit.   

I think I'm ready with my G12 now...   but I'm not quite sure...

Ad B

Magnificent! Love the idea of putting the Stelvio headers on a GRiSO. Not just for the correction of the header lengths but that is a very positive thing of course. For me the Stelvio headers sinous curves is some of the best looking ever. Great effort Ad B! Could you post a pic shoving how the system looks under the gearbox? I am very tempted to copy your idea...

/Ron

Hi,

I'm too busy now to make pictures from beneeth...
We are leaving tommorow morning (quite early...) on a 4 weeks holiday through France.  
After that, I will make the picture...
I bought two 90° RVS pipes Ø 57mm x 2 mm. I used these to modify the crossover pipe.
4 to 5 weeks patient... 

Ad B

No worries, it's summertime so no major mods this time of year for me. Trying to ride as much as possible.   

Bon voyage au France,  and stay safe.

It seems like most after market exhausts have been explored in this thread, however I'm interested to know in anyone has modified the stock unit ??
And if so, what sort of results they have experienced???

Whilst the Mistral high pipes tick all the boxes in terms of reduced weight and a 'slightly cranky' note, they just don't fit with the Hepco & Becker bags I use fairly regularly on the Tenni.

And when I look at possible alternative pipes, as best I can estimate, most of them wont fit with H&B's.

The stock pipe sits pretty low and looks fine, and I can live with the few extra lbs/kgs.
And I just happen to have a 2nd stock pipe I'm prepare to 'sacrifice'.

What am I looking to achieve?
Well the SE runs great since Pete loaded up Marks latest map about 1 month ago. And the indicated fuel consumption even got a little better. So ideally any mods don't screw this up.

But I really want some of that missing Guzzi 'hoodlum', rather than the very muted and 'respectable citizen' we have at present.

All musings gratefully received.

Spozzy

Depends on which bags.
My H&B C-Bow soft bags fit easily with the Quat D pipe.
I haven't tried them on my new bike with a low Mistral but I think the will be ok.
As for the hard bags I can't comment.

I think by looking at the pictures, the Quat D would eork on the hard bags as well.

That's why it is at the top of my list.

Many of the aftermarket pipes will work with your bags. From experience, I know that both the Quat-D and the Arrow both sit at or below the same level as the stock exhaust.

Birch,
If you do buy the Quat D pipe it comes with a catalyser which should be used withe the Db killer on the 8v engines, it will improve fueling and does not detract from performance.
They are a really good product and I would buy one agian for my newer bike but it already has a mistral pipe on it and I can't justify the extra spend.