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Hey yall, I bought some slip-ons for my 2017 iron 883. I did this because I dont have the cash to blow on a full exhaust, ac and tuner (stage 1). But I need louder sound (loud pipes save lives), because stock mufflers are too quiet!! They are 9 shorties though. My question is, will I hurt my motor or anything on my sporty by running these and not getting a tuner?
link to the slip-ons I got:
Radiant Cycles Shorty GP Exhaust for 2004-2018 Harley Davidson Sportster 1200 Black https://www.amazon.com/dp/B07H5S8W1G/ref=cm_sw_r_cp_api_i_h63PEbQMT9CPR
Photo of 9 slip-ons I ordered.
Last edited by Mr_Jossi; Apr 27, 2020 at 10:12 PM.
Reason: Typo
No. You can alter the exhaust without a tuner although most research I found indicated that while slip-ons were okay, full headers/straight pipes suggest a tuner. If getting a different air box, you definitely need one. The O2 sensors are narrow band and the ecu can only alter so much fuel for the air, unlike wide-band sensors on vehicles.
What you will do is alter the tuned length of the exhaust and so will affect where the power and torque is produced for better or worse but as above without altering the input side of the equation you should be good to go without a tuner.
The O2 sensors are narrow band and the ecu can only alter so much fuel for the air, unlike wide-band sensors on vehicles.
This is a mistake I have made. The fuelling system works in closed loop and open loop. Only when the system is working in closed loop is the O2 sensor used. So the ecu needs help with what it needs to do when in open loop situations, this is where the tuner or re-map does its job.
Last edited by Andy from Sandy; Apr 28, 2020 at 04:01 AM.
No. You can alter the exhaust without a tuner although most research I found indicated that while slip-ons were okay, full headers/straight pipes suggest a tuner. If getting a different air box, you definitely need one. The O2 sensors are narrow band and the ecu can only alter so much fuel for the air, unlike wide-band sensors on vehicles.
thanks for your input man, much appreciated. Im new here and this is my first street bike. So if Im understanding correctly, the O2 sensor and ECU should adjust for the change in my mufflers/slip-ons?
ive heard that changing the AF ratio will make my sporty run too hot since its already lean from the factory. So Im getting mixed reviews. Not doubting you, just explaining my research. Dont plan on doing an AC anytime soon, just swapping out the stock mufflers for these
What you will do is alter the tuned length of the exhaust and so will affect where the power and torque is produced for better or worse but as above without altering the input side of the equation you should be good to go without a tuner.
This is a mistake I have made. The fuelling system works in closed loop and open loop. Only when the system is working in closed loop is the O2 sensor used. So the ecu needs help with what it needs to do when in open loop situations, this is where the tuner or re-map does its job.
so explain to someone like me who is a newb. Lol so my 17 sporty should adjust to this minor muffler change? Or are you saying I do need a tune? Again sorry Im new to all of this, so if I sound clueless its mostly because I am and I need yalls input haha
Last edited by Mr_Jossi; Apr 28, 2020 at 10:39 AM.
so explain to someone like me who is a newb. Lol so my 17 sporty should adjust to this minor muffler change? Or are you saying I do need a tune? Again sorry Im new to all of this, so if I sound clueless its mostly because I am and I need yalls input haha
Basically the EPA and Harley have the factory setup running so lean that technically even a bike with stock AC and exhaust would benefit from a tune to richen the mixture and reduce the temperature the engine runs at, having said that the rule of thumb is that just AC or just exhaust is OK without a tune but not both without risking engine damage.
Be careful if you have an extended warranty as adding a non Harley tuner will void the engine coverage of your extended warranty.
Basically the EPA and Harley have the factory setup running so lean that technically even a bike with stock AC and exhaust would benefit from a tune to richen the mixture and reduce the temperature the engine runs at, having said that the rule of thumb is that just AC or just exhaust is OK without a tune but not both without risking engine damage.
Be careful if you have an extended warranty as adding a non Harley tuner will void the engine coverage of your extended warranty.
thanks for your input man, glad to know Ill be okay with these short slip-ons I ordered. Dont plan on doing anything else to my bike in the near future until I have funds to do a proper stage one. And I bought her used from the dealer but dont have a warranty, so no worries breaking that.
Also saw something from another thread. With this short slip on set up, would I benefit purchasing the XL-VIED? Again, Im sure I sound like a newb which I am, but this seems better to me than buying a $400 tuner. From what I understand, this is just a plug in fuel management device that stays on your bike?
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Help! Bought slip-ons for my sporty
