Cheeseologist
New member
what are the advantages to a cat delete pipe on a spyder rt?
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What are the advantages of a cat delete?
- Thread starter Cheeseologist
- Start date
ButterSmooth
New member
Less heat. Less smell. Less weight. Some ability to tailor sound level.
bikerchris1270
Member
What are the disadvantages?
BLUEKNIGHT911
Sadly Passed Oct 2024 - RIP
Nope - just removing the " CAT " will have No effect on the HP .... The Spyders computer is Designed to keep it's Factory parameters .... It's not like the Old days when carburetors ruled. .... Mike :thumbup:
ButterSmooth
New member
Illegal modification in many states. I lost ~1.5 mpg without a baffle and gained it back with the baffle installed. No perceptible change in performance either with or without the baffle. I doubt there would be any measurable performance differences. Improved, richer sound, with the baffle and no perceptible increase in volume level -- to my ears. Rice-burner rasp without the baffle when revving the engine, just a little louder on the road.
hillrad
New member
Contrary to ButterSmooth's "less smell", I tried a modified cherry bomb car muffler on the old GS and we (me and passenger) smelled like a pit crew from the Indy 500 after a ride.
ButterSmooth
New member
A ratchet strap around the rear tire and hooked to the spring tool makes it much easier. Thank Shadow71 for the tip.
Cobwebs
New member
You can hear if someone is outside stealing your bike.
Snoking1127
Well-known member
Subject to a large fine from the EPA!
Mikey
Well-known member
:roflblack:
PMK
Active member
If you typically ride with you shifting gears a little higher in the rpm, the bypass pipe will give a stronger mid range pull and revs freer to get there. So technically you may not see an increase in peak power, and if you putt round at lower revs without a baffle the power will be softer. There is no free lunch, always a trade off.
If there is a free lunch, it is a huge reduction in heat. As for the exhaust note, some claim it is raspy and obnoxious, for whatever reason, ours is not bad at all. Certainly not a Harley thump, nor a Briggs and Stratton drone, no way it sounds like a 4 cylinder sportbike. Running the oem muffler does give a decent somewhat sportscar sound.
PMK
Active member
Yes and no...The computer does not measure actual power output, so if power can be gained, it will reach the rear wheel. The computer is watching many parameters. Regarding the exhaust, it is a single point O2 sensor which monitors FA ratio. There is no secondary downstream O2 sensor after the convertor. Lacking the second sensor, the computer does not have input data to monitor how well the convertor is reducing emissions from input to output. Therefore, the computer adjusts fuel ratio based of the one probe it monitors, and with this controls the mixture to the intake ports.
Regarding making more power, if the exhaust is more free flowing, AND the computer can retain the preset FA ratio range without faulting, more fuel in will increase power. Unlikely a lot, and doubtful any serius increase at high rpm. It is now common knowledge that the engineers de-rated the power output by limiting throttle opening. Therefore the trick per say, if not getting the computer remapped, is to make stronger power throughout the rpm range. So, having an increase in mid range power, while retaining proper FA ratios, via a free flowing exhaust and air intake is viable. No dyno runs, but our 14 RTS has a stronger pull through the mid range and up to speed. Is it crazy fast, no, but better.
I have always run 93 octane fuel also. The computer will adjust over time to your riding style and often times fuel used. I would need to verify if the Spyder 1330 monitors knock, and if so adjusts timing. Very possibly it does, and if so, will increase timing as needed, which can also greatly improve power, especially mid range.
ButterSmooth
New member
Heat reduction is the reason mine was changed. Without the baffle (RLS), it was only 'raspy' when revving the engine with no load, something rarely done. With the baffle, the sound is very pleasant on the road. The burning rubber smell that I first thought was the belt disappeared with the converter removal.
EdMat
Well-known member
Did you find that there was in fact a noticeable reduction in heat? Did you get the ceramic coated version?
ButterSmooth
New member
Mine is *not* the ceramic coated version. The biggest change in perceived heat attributable to the RLS is the absence of hot air rising into my helmet at a stop, which is very welcome. It is cooler while riding, but I can't tell how much of the change is the RLS versus the new adjustable air deflectors. 90° rides are more enjoyable now, but I expected to see a change in the temperature reading on the dash, since it mostly seems to indicate the air temp inside the plastic.
PMK
Active member
FWIW, typically, when the Gearbox Position Sensor is neutral, the ignition management is degraded.
Drwerner
New member
So true. I did a full Remus exhaust replacement on a R1200GS Adventure Water COoled - which included a cat delete and had to do extensive modifications to management control software to keep the fuel mixture from getting too lean. In the end it was louder with no noticeable performance improvements - and that bike stock would blow away my 21 RTL It was a fun project, but IMHO, not worth the effort or cost. Modern bikes are designed to work within relatively small parameters in terms of fuel/air mixtures, back pressure - messing with a parameter, throws things off and the result is often a negative. Oh yeah, you also get to increase your carbon footprint. It's not a green move. If you do decide to mess with your exhaust, plan on making other modifications (like engine mapping) to accommodate.
PMK
Active member
So true. I did a full Remus exhaust replacement on a R1200GS Adventure Water COoled - which included a cat delete and had to do extensive modifications to management control software to keep the fuel mixture from getting too lean. In the end it was louder with no noticeable performance improvements - and that bike stock would blow away my 21 RTL It was a fun project, but IMHO, not worth the effort or cost. Modern bikes are designed to work within relatively small parameters in terms of fuel/air mixtures, back pressure - messing with a parameter, throws things off and the result is often a negative. Oh yeah, you also get to increase your carbon footprint. It's not a green move. If you do decide to mess with your exhaust, plan on making other modifications (like engine mapping) to accommodate.
The Spyder 1330 does not throw a fault code or require additional changes to the engine mapping if a bypass pipe is installed. If an owner wants the single most effective power increase, then remapping is the way to go. Unfortunately, remapping alters the carbon footprint you speak of.
The number 1 reason to remove the converter is the huge reduction in heat. Not everyone needs this done. Those living in cooler areas may not. Riders that seldom see stop and go traffic may not. Possibly the owner does not ride during warmer months.
Our primary reason was heat reduction, other aspects were a bonus.
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