SuperTrickk Exhaust

[MAXIMAN]

Pete

I didn't muck around with the plates in the diffusers. Initially I installed them with the original 12 plates they came with. But because the Jardine megaphones were deeper at the point the baffled seated...12 plates barely cleared the end of the meg. So I added 12 more for a total of 24 plates each side. There are about 13 or 14 plates protruding out of the megaphones now. The pipes have a very mellow sound if I ride normally.

However if I spur Zilla these pipes and baffles really wail.

As far as tinkering around with the number of plates for tuning purposes I really did not do that. I simply assumed this SuperTrickk setup would NOT flow as much as the stove pipe (4-1 with R1 can) and put as many plates as I could to insure it would flow.

Again I was wrong. It appears this dual megaphone rig does flow well. And apparently due to the design they help distribute the power over a wider range of revolutions. I'm starting to get a better feel for what is meant by "tuned exhaust". The engineers at companies like SuperTrapp, Jardine, and the likes obviously know what hey are doing.

Patrick

I see you did not take my advice. But since you are so "experience" with the utilization of dynamometers and you're such a great engine tuner......... where is YOUR dyno chart?

Of course if you posted one now everyone would know it is bogus...something you ginned up on a XLS spreadsheet.

There a HUGE difference between guys like you and guys like Me and Dan Hodges. You talk the talk. We walk the talk.

[MAXIMAN]

And as an addendum........this is not so much for pggg's benefitbut for the rest of the brotherhood....

Anyone with more than feces for brains knows that using a dyno for "absolute" comparison is a dangerous proposition. The Dyno is really most effective when measuring gains after modifications.

My baseline run on Zilla...when it was BONE STOCK with only 10,000 miles on the clock was 71.8 hp at the rear wheel. Now I am at 96.2 RWHP. For those of you educated in the NZ public school system (no offense Pete ...wink wink) that is a net gain of 34%. Ya can't do much better than that short of titanium valves, balanced cranks, uber light rods, and other very expensive trick sh!t. But then I doubt pggg can grasp such a concept.

If I had done these same mods to my bone stock '79F....and had gotten the same 34% over the base run on that bike(which was 81 hp) the end result would be 108.5 hp.

The reason I post these results is to help others if they want to improve their Elevens. I have spent a small fortune playing around with the performance of this bike. Most people don't have that luxury and so if I can help others by sharing information with tangible results I will gladly do it.

Some of the things I've tried have not worked. Some have. If I can save a fellow XSive the pain and the money of doing this themselves I gladly do so.

One of the first XSives to start this trend was Gene Pitkin (GNEPIG). Kudos to Gene for sharing what he learned by tuning his '79SF. He got big gains with very little invested by using nothing more than ingenuity.

Patrick it doesn't matter what trick stuff has been invented....you piss on it. You pissed on me. You've pissed on Dan Hodges calling BS on one of his ideas. You even pissed on Chop's uber cool 750 final drive mod. And Chop is one of your BUDDIES!!! He liked your chain drive mod.

Did I ever crap on your chain drive modification or put it down?

Patrick you're like a fly that won't die. Very annoying. If you had something constructive to add I would gladly welcome it even if it were critically constructive. But it never is. So please...I am asking you nicely...JUST GO AWAY. When you see I've posted ...just flee the temptation ...do everyone a big favor and go to another thread.

[petejw]

Maximan,
I really liked wat u did to ur exhaust,
so i sussed out prices from
a supplier over here in another
state,
this is wat they wanted

the core is $109

12 discs $89.90

Bolt pack $29.90

End cap $49.95

not cheap stuff

unfortunately tho my muffler is 3 half inch diameter
they sell parts for a 3" and 4" only.

[petejw]

just out of curiosity then
did the xs ever have 95 HP at the rear wheel
as it was advertised when new,
was it ever really dyno when it was new?
cause it seems from wat i gather from previous
posts, the average was around the 70 hp mark.

max,
no offence taken
im an aussie other side of the ocean :-)
tho our schooling system
probably isnt much better,

btw
faeces is spelt with an 'a' in it lmao :-)

[desert1]

End plates

My 79 special I bought 3 years ago for $200. Cdn had a Supertrap 4into 1 stainless setup on it......one problem initially I had with the bike in getting it to run was that the plates were completely blocked with crud, once I removed the plates and cleaned them out the engine could breath and away she fired....sounds wicked I might add as its now on my 78 standard
Bruce
78XS1100
79xs1100 partzer

[Pat Kelly]

I did a bit of reading on back-pressure and scavaging of exhaust systems to determine how many discs to use on my bike.
Not enough back-pressure (adding discs for the SuperTrapp) allows more flow through the combustion chamber. It is possible to have too much flow through and a large portin of the air/fuel passes right through to the exhaust and is never burned, not very efficient.
Too much back-pressure (fewer discs) can have the air/fuel mixture fill the combustion chamber then 'reverse pulse' back into the carbs. Ive noticed on my E that the carb boots pulse back and forth at idle for just this reason.
Addidng or subtracting discs optimizes where in the RPM range the bike is most efficient. If you constantly go wide open throttle to redline you want freer-flowing system. Cruising at 4,000 RPM for hours on end would call for fewer discs.
Cody, try removing some discs and see if the curve gets better for you.
For my current project 4 into 1 into 2, I have two of the 3" SuperTrapp mufflers. They are actually 3 1/2" diameter and take 3" discs so there is that 1/2" gap (1/4" clearence) between disc and muffler body. All the discs are tucked inside the muffler. SuperTrapp recommends 8discs for an 1100cc engine, add 1 or 2 for modifications. This would be 4 discs on each side. I currently have a SuperTrapp baffle and discs on my 4 into1 (RC I think) single muffler. I had 8 discs on it and it seemed to flow just fine (I have the 1196 kit, K&N in airbox, 4>1). I recently aquired 10 more discs and put them on. I don't feel the bike runs any better but it is louder.
I inquired about how much $ to put the bike on the local dyno. $100 for hp and torque print-out along with air/fuel. Discount for subsiquent runs if I make changes if needed. Too bad I'm currently unemployed.

[MAXIMAN]

Pete

The rating from the factory of 95 hp was a crank or clutch rating. None of these bikes made 95 at the rear wheel. By the time they spin up through the tranny, middle gear and final drive they loose 15% or more.

I can believe that stuff costs much more in OZ than here. There probably isn't a lot of demand down there and it has to be shipped.

[MAXIMAN]

Pat

I will certainly tinker with the plates to see what will happen. However the bike works very well the way it runs now. It is very strong upon launch and really starts rockin and rollin from about 3000 all the way to redline.

That little dip @ 3800 is not even noticeable. But they mountain of torque 4K to 6K is definitely noticeable.

I might be able tyo taker your advice...subtract a few plates and get the curve perfectly straight with no dip at 3800. But I'm guessing I would lose a lot on top.

I'm not sure what dyno time cost here at my dealer. I have spent so much money with this guy he pretty good to not overcharge if at all. I think if some one walks in off the street he gets $50 or $75 for a run (a run being 3 to 5 passes).

Air Fuel Ratios on a dyno sniffer are dubious at best. For instance...I once had string of runs where a bike I had was making 80 hp and the AF was dead nut on 13:1. But the bike should've been making a lot more.

Later at home I pulled the plugs. 1 and 4 were good. 2 was way rich and 3 was way lean. It seems 2 and 3 were cancelliing each other and the AF ratio appeared o be good.

BUT once I got the bike tune where it was burning right on all four ...the AF still showed 13:1 but the power jumped to 90+.

So you can take that AF curve with a grain of salt. If you know all four cylinders are good then the AF curve is helpful. But in this case it was useless.

[pggg]

From Maxxy

"Patrick it doesn't matter what trick stuff has been invented....you piss on it. You pissed on me. You've pissed on Dan Hodges calling BS on one of his ideas. You even pissed on Chop's uber cool 750 final drive mod. And Chop is one of your BUDDIES!!! He liked your chain drive mod.

Did I ever crap on your chain drive modification or put it down?

Patrick you're like a fly that won't die. Very annoying. If you had something constructive to add I would gladly welcome it even if it were critically constructive. But it never is. So please...I am asking you nicely...JUST GO AWAY. When you see I've posted ...just flee the temptation ...do everyone a big favor and go to another thread."

O.K. loudmouth, here's your lecture for the week.
Sorry big-shot, but I call B.S. when I hear B.S. and sorry, but you're not capable of listening to constructive criticism without getting snaky, abusive and insulting. You've shown that time and time again haven't you?

So keep acting like a jackass and I'll keep treating you like a jackass. You wont get a smooth ride from me till you pull your head outta your own backside matey..

[Hammerhead1st]

[Hammerhead1st]

I just de-baffled my pipes completely. After reading through these posts, I find I am leaning toward some nice through-flow baffles with adjustable plating. I love my turnout pipes so maybe I can fit the plates inside them. Meanwhile the beast ROARS. Fired it up after remounting the nekked pipes, and a friend of mine called me from a block and a half away..."Hey, uh, you wanna keep it down up there?"

I know I need to rejet, but I think I'll hold off on that till Im ready to re-baffle.

[MAXIMAN]

Speaking of BS....we are all waiting "Patty"...with baited breathe....to see some of YOUR dyno numbers...."Patty"

[Jeremy_Sells]

Hey MAXIMAN - I got the same BS from pggg when I was spending a bunch of time at the dyno. I even sent him a link to find the nearest dyno in New Zealand but $150 bucks was too much to spend to prove himself right!?

Remember this?
http://www.xs11.com/forum/showthread...5&pagenumber=8

I applaud you and Dan for spending the time and $$'s to try and lend some expertise to this forum. Take away all of the experience from the REAL gurus on this forum and we would have nothing to be pround of at XS11.com! Keep up the good work and do your best to ignore the uninformed and untested rhetoric. You should be out riding that thing anyways!!

Take care -

[HobbyMan]

Exhaust tuning is tricky buisness. You guys obviously know your stuff.

[Hammerhead1st]

Originally posted by HobbyMan
I can't believe a thing you guys say. You're all obviously full of shi* (THis qoute may have been edited for content...)

That Merchant Marine Academy...is that under the Throg's Neck bridge? Or is that the Maritime College? I used to see it all the time when I would go to NYC to deliver Morton Salt.