Modifying Stock Sprint ST 1050 Muffler - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 9 (permalink) Old 10-10-2019, 08:48 AM Thread Starter
Minitwins
Main Motorcycle: Triumph Sprint ST 1050
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Modifying Stock Sprint ST 1050 Muffler

Hi All

So a few years back I had a 2005 Sprint ST 1050, fitted with a TOR muffler. After an engine failure and a repair bill higher than the price i paid for the bike, she went into the back corner of the garage... With good condition motors being extremely scarce, I finally decided to rather shop for a replacement bike, and use the old one for spares if necessary. A few weeks back I finally found a 2008 Sprint ST for a good price and snapped her up. She still had the original factory muffler, which was just to quiet for me. After scratching around on this forum I find Cowtown's post, as seen in the link below.

https://www.triumphrat.net/showthrea...t=41117&page=3

Since i work at a workshop which has a TIG welder and on Oxy Acytelene torch, and had the original factory muffler which came with my first Sprint when I bought it, I figured I would give this a go. Build pictures and Audio to follow once I have uploaded everything and taken some "after" videos and sound clips.
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post #2 of 9 (permalink) Old 10-11-2019, 04:27 AM Thread Starter
Minitwins
Main Motorcycle: Triumph Sprint ST 1050
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So we start off with an OEM factory muffler, cut the rear compartment off, along the line of the black paint. Using the biggest hole saw that would fit between the two layers of mesh plate inside, two holes were cut into the baffle plate (cant remember which size, but think it was 1.5" or 1.75". Next to receive the chop were the three 1" tips, courtesy of the Oxy Acytelene torch, in order to make way for three 44.5mm OD Stainless Tips. The cutting was rough, and I imagine that with better marking and a Plasma Cutter, this step would have been better executed and the gaps between the muffler and new tips would have been smaller, which would have saved a lot of time on the welding phase.
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post #3 of 9 (permalink) Old 10-11-2019, 01:12 PM Thread Starter
Minitwins
Main Motorcycle: Triumph Sprint ST 1050
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So now for the fun stuff, the re-assembly. I did some rough measurements on the old outlets, and cut three tips from a tube of 44.5x1.5mm SS316 tube. I cut in 45 degree tip angles to try and maintain the OEM look, but to be honest it probably should have been a steeper angle to more closely match the OEM tips. These tips were then TIG welded into place. This process took the longest of the whole build, but only because there were big gaps to fill and I did not have a roll of SS MIG wire, only TIG filler rods. Closing big gaps with TIG machine is a TEDIOUS process!

Once the tips were in, it was just a matter of rejoining the two halves, which went smoothly, and then a quick respray with High Heat paint. From here, about 45 minutes to strip down the necessary bits (Seat, Seat Fairing, Pillion Handle, Tail Piece and old muffler) and have the new unit in!

And the result? I have not remapped the ECU yet, but the sound is much deeper and definitely louder, and that triple just sounds fantastic at around 4-5k RPM!! Also get some lovely pops and burbles on the over run, with a loud pop about 5-7 seconds into the overrun. Will try post some Audio Clips or Vids soonest!

Next challenge is to get the ECU remapped with Tune ECU. I bought the cable from the TTP website as per recommendation from another post on this forum, and followed all the steps on the TUNE ECU for dummies post, however when I try connecting I get an error "Could not connect to ECU". It tells me to check the cable and connections and to turn ignition off and on, but I keep getting the same error even though the PC can see the cable.... BTW, I ordered the cable on a Friday afternoon and opted for the more expensive courier shipping as our Local postal service is pathetic, and the cable arrived the following Monday afternoon!!

Anyway, enough of my long post, enjoy the pics and hopefully soon some audio!
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post #4 of 9 (permalink) Old 10-11-2019, 01:31 PM
Grand Prix 500
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"A grinder and paint make me the welder I ain't"
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post #5 of 9 (permalink) Old 10-11-2019, 04:00 PM Thread Starter
Minitwins
Main Motorcycle: Triumph Sprint ST 1050
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So I tried uploading some audio clips, but the tracks were too big... Anyway, see links below for the comparison videos.

Before:

After:

Best to use earphones to appreciate the difference!! Attached are some pics of what it looks like with all the trim refitted. Pipes could maybe have been another 20 or 30mm longer to more closely match OEM look.
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post #6 of 9 (permalink) Old 10-15-2019, 05:48 AM Thread Starter
Minitwins
Main Motorcycle: Triumph Sprint ST 1050
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Hi All. Took the bike in to my local Triumph dealer yesterday to replace leaking fork seals, and whilst I was chatting to the service manager I mentioned my issues with remapping the ECU after modifying the muffler. When I went to pick up the bike, they had remapped the ECU for me free of charge. There used to be a slight power delay when opening up the throttle, which got worse after fitting the modified can. with the remap, the power throttle response is instant, and now i get even more wonderful burbles on the overrun! Very happy with how she's running now!
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post #7 of 9 (permalink) Old 10-16-2019, 01:54 AM
Grand Prix 500
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Sounds sweet.
Just out of curiosity, any performance gain?
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Ride it like it's stolen!
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post #8 of 9 (permalink) Old 10-17-2019, 03:10 PM Thread Starter
Minitwins
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Quote:
Originally Posted by BluSprint View Post
Sounds sweet.
Just out of curiosity, any performance gain?
Don't have any dyno data to verify power gains, but the giggle dyno says the the better throttle response and sound make it a worthwhile modification! Gotta watch for speed traps though.... doesnt take much time or twist of the throttle to find yourself on the wrong end of the speed limit, especially with the encouragement of the triple howl at the top end of the rev range.....
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post #9 of 9 (permalink) Old 10-28-2019, 08:11 PM
Grand Prix 250
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good stuff and well done
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