3D dI EXHAUST MOD.

[D 5UPE]

Ive been toying with getting rid of the resonator pipes on my 3D dI for a while but been waiting for my Seadoo warenty to run out before I start modifying.
The idea is to remove the resonator pipes and go straight outa the hull with a stainless steel fitting.
I actually found a performance race car exhaust manufacturer to take the job on.
I should get this part back on the 5th of November so I'll post up some pictures and how its going to fit.

 

[D 5UPE]

Resonator pipes.

 

[D 5UPE]

Straight through stainless pipe.

Not sure how it sounds yet but hoping it gives the ski that little bit extra kick.

 

[cnd660r]

Wow looks good. I did this to my 2004 3d except I brought $90 worth of silicon tubing and stainless couplers to replace the three resonators. As far as sound, I found it to be a tad louder while riding the ski, don't know how it sounds from a spectators point of view though. The ski defiantly had more pep after getting rid of the needless pounds of resonators. You'll have to post how the 951 engine responds because I'm considering doing it to my GTX.

 

[D 5UPE]

I thought about using rubber bends but found it harder to source them. So got the stainless one made. It sounds well out off water, and im going to test it hopefully this weekend.
But of late the weathers been poor every weekend.

 

[Ibanez540r]

CND660R - I'd like to hear more about your mod. How noticeable was the difference? I started playing with mine, then decided not to mess with it and put it back together. COntemplating whether I should go ahead or not.

Noticeable?
Harder to start?
What kind of pipe did you use?

Thanks man -Mike

 

[D 5UPE]

Hi Mike,
How noticeable............not much as I top out really quick and it wont give more. I need a new impelar as im hoping for better bottom end take off.

Starts ....as it has always startedvery good. Im needing a new Dess for this seasons fun and its on order as of now.

I used stainless steel, not sea grade. Same as auto aplications.

I love the ski and its performance and how bad ass it sounds.
Been riding it hard for two years now and its parts and repairs all the way now. Its not as bullet proof as some, as im now finding out.

 

[Ibanez540r]

Lol, thanks, although I'm not to sure how to take that... I'm guessing / hoping sarcasm??? Not much... Although tops out really fast?

Sarcasm = it is quit a bit different and gettin you up to speed much quicker, or am I an idiot and your really saying no too much?

 

[D 5UPE]

PMSL Its the English terminology V American again.
Ski goes well, when its in the water.:rofl:

 

[Ibanez540r]

Is there a reason no one considered doing it like this? the picture is very generic, but you get the idea. It's less material and more of a direct flow?

 

[Ibanez540r]

PMSL Its the English terminology V American again.
Ski goes well, when its in the water.:rofl:

LOL, ok so it's a worth while mod... :hurray:

 

[D 5UPE]

Yes it would save on pipework. But the bend goes up to the same height as the fuel tank to stop water flowing in while stationary in the water.

 

[Ibanez540r]

That's right... I just recalled this guy (post #3)

http://www.seadooforum.com/showthread.php?t=15203

When I first saw this thread i thought you were him and it was the same mod. Thats why I asked about hard starts.. i remember him saying it was a little slow on startup due to back pressure (water in exhaust)

 

[cnd660r]

Ibanez540r the difference was noticeable on the RFI engine, I found it to be more peppier and just accelerate faster, less of a bog down when nailing the throttle, top end is still the same. Sounds pretty cool too.

Starting is the same, the reason you don't want to do the straight pipe from the muffler to the outlet, as in your picture, is because that would get rid of the loops the exhaust makes to prevent backflowing, thus making it very hard to start.

I ordered the silicon tubes from www.siliconeintakes.com, It came out to be around $90 and i replaced all three resonators and all the plastic exhaust couplers with stainless ones.

Any more questions just ask, if I find my receipt I will tell you exactly what I purchased because the back tube actually steps down in sizes.

 

[Ibanez540r]

Ibanez540r the difference was noticeable on the RFI engine, I found it to be more peppier and just accelerate faster, less of a bog down when nailing the throttle, top end is still the same. Sounds pretty cool too.

Starting is the same, the reason you don't want to do the straight pipe from the muffler to the outlet, as in your picture, is because that would get rid of the loops the exhaust makes to prevent backflowing, thus making it very hard to start.

I ordered the silicon tubes from www.siliconeintakes.com, It came out to be around $90 and i replaced all three resonators and all the plastic exhaust couplers with stainless ones.

Any more questions just ask, if I find my receipt I will tell you exactly what I purchased because the back tube actually steps down in sizes.

Yeah that'd be awesome. Let me know...

 

[cnd660r]

Ibanez540r just wondering, do you have the RFI engine or the DI engine?

 

[Ibanez540r]

Ibanez540r just wondering, do you have the RFI engine or the DI engine?

'05 RFI, same as you

...I should update my profile

 

[cnd660r]

Ok just making sure we're on the same page. Anyway here is what I ordered, cheaper than what I remember.

Products
1 x 2.75" Silicone Straight Coupler, Black $6.99
4 x Stainless Steel Joiner, 2.75" $31.96
1 x Stainless Steel Joiner, 2.5" $7.99
1 x Silicone Reducer, 90° bend - 2.75" to 2.5" - Black $19.99

Sub-Total: $66.93
FedEx Ground : $12.99
Total: $79.92

 

[Ibanez540r]

Ok just making sure we're on the same page. Anyway here is what I ordered, cheaper than what I remember.

Products
1 x 2.75" Silicone Straight Coupler, Black $6.99
4 x Stainless Steel Joiner, 2.75" $31.96
1 x Stainless Steel Joiner, 2.5" $7.99
1 x Silicone Reducer, 90° bend - 2.75" to 2.5" - Black $19.99

Sub-Total: $66.93
FedEx Ground : $12.99
Total: $79.92

Cool, appreciate it. FYI, the 90 bend is actually only $9.99 now! Anyway, is that definetly everything? What did you use for the lengths, the original hoses?

 

[Ibanez540r]

Disregard - I looked at the microfiche and see what you did... nice.

 

[Ibanez540r]

CND660R - looking at the microfiche, what do you think about removing muffler #32 with a staright pipe leaving just the big muffler in place #40 ???

 

[magical]

hi d5upe my engine is away getting fixed now im getting a full rebuild ie new crank balance shaft rebore pistons gaskets and i get 12 month warranty all for £1000 when i phoned the one up in scotland they wanted £2500 and only offered me 3 months warranty so i cant wait to get it back .www.jetskicentre.co.uk its down in east sussex but the shipping fee was only £15 each way well worth a look if you need parts . mark

 

[cnd660r]

Oh yeah sorry I forgot that I used hose #52 and cut it and put it on the thru hull fitting and attached the 90 to it. Take a look at the attached pics above.

I don't see a problem removing muffler #32, as long as it does not have any sensors attached anywhere, my ski is up for the winter right now but I remember that some of the pipes right off the engine are metal but it should work. But yeah if you do that you'll have to let me know how it works out. The main reason I removed the resonators was to move the battery to the back left to keep the ski from leaning, I then decided to keep it in the front but move it over.

But yeah thats all I had, then just get some high temp red gasket maker to seal everything and a ton of hose clamps.

 

[cnd660r]

I was also hoping that removing the resonators would fix the stalling problem that my ski has, I brought the ski brand new and it has always cut out about half throttle and still does to this day only in a very small rpm range which is a good cruising speed for me. The dealer I brought it from told me that the fuel injection mapping on the 800 RFI's caused the cutting out and that he has encountered jet boats and other skis with the same problem. So IDK, Ibanez540r yours ever cut out?

 

[Ibanez540r]

Last year was my first season with it. Bought it used, but no stalling problems what-so-ever... ?? Interesting...

BTW did the battery swap fix the lean completely?