#1 2010-02-02 18:15:20

RZR CUT

Member

Registered: 2010-01-26

Posts: 8

Re: Aftermarket Exhaust Question (RZR)

I just ordered a Yoshi mid pipe and muffler combo for my RZR.....

My question is, if I leave the intake/filter/etc alone (exhaust pipe ONLY mod)....... would I need to do any adjustments to my fuel system? Will this mod alone, "open it up" enough to need more fuel intake? Thanks.

By the way, I'm at 700ft elevation. And I'm only buying the pipe for a better sound, not really for a performance boost.

---

'09 STEALTH RZR ~ pretty basic: Bighorns on Bruisers*Extended Fender Flares*Hard Sport Roof*Half Windshield*HoodScoop*Bed Extender Rails*Rearview Mirror*Yoshi System Ordered!

RANGERDALEXP

Member

From: Palmdale, Ca.

Registered: 2008-09-02

Posts: 902

Re: Aftermarket Exhaust Question (RZR)

I just ordered a Yoshi mid pipe and muffler combo for my RZR.....

My question is, if I leave the intake/filter/etc alone (exhaust pipe ONLY mod)....... would I need to do any adjustments to my fuel system? Will this mod alone, "open it up" enough to need more fuel intake? Thanks.

By the way, I'm at 700ft elevation. And I'm only buying the pipe for a better sound, not really for a performance boost.

Anytime you change the way the engine brings air in and out of an engine there needs to be changes done to the air fuel ratio. Polaris ecu's do not have the ability to see how the engine is fueling and make its own adjustment because that would require an o2 sensor interface from the exhaust and the ecu. Temperature and altitude will decide the difference if you will run to lean or way to lean when you improve the air flow of the engine. that is why you either need to reprogram the ecu or install a fuel control module with an air fuel gage to see how the engine is burning fuel. Since you are at 700ft I would not do the modification without the controler.

---

2003 Ford F350 Superduty FX4 Lariat, Banks Kit.
2003 Rampage 365 Toy Hauler.
2005 Ranger Xp, Sp belt, EPI Clutch Kit, Sp Ecu.
2001 Honda XR650R With Go Fast Kit.
[img]http://i388.photobucket.com/albums/oo330/RANGERDALEXP/JAWBONESNOW11jpg-1.jpg[/img][img]http://i388.photobucket.com/albums/oo330/RANGERDALEXP/aniranger_blue11.gif[/img]
All data and information provided from my postings is for informational purposes only. Rangerdalexp makes no representations as to accuracy, completeness, currentness, suitability, or validity of any information on this site and will not be liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis used for reference only.

elmerkit

Member

Registered: 2010-03-18

Posts: 106

Re: Aftermarket Exhaust Question (RZR)

Here what I do with carb engines you have to adjust the a/f mixture manually. With efi or with ecu you just have to reset the ecu by disconnecting the battery for some minutes then install it again. It will automatically adjust by it self.

RANGERDALEXP

Member

From: Palmdale, Ca.

Registered: 2008-09-02

Posts: 902

Re: Aftermarket Exhaust Question (RZR)

Here what I do with carb engines you have to adjust the a/f mixture manually. With efi or with ecu you just have to reset the ecu by disconnecting the battery for some minutes then install it again. It will automatically adjust by it self.

That is really not true on Polaris ECUs because they really aren't learn mode on these units. The fuel curves are hard coded and in order for an ECU to have the ability to have learn mode they need a Mass air sensor and a O2 sensor and Polaris Ecus do not have this ability.

On a carb motor when you order the exhaust they normally come with a new main jet that needs to be changed out when you do the exhaust Pipe....

---

2003 Ford F350 Superduty FX4 Lariat, Banks Kit.
2003 Rampage 365 Toy Hauler.
2005 Ranger Xp, Sp belt, EPI Clutch Kit, Sp Ecu.
2001 Honda XR650R With Go Fast Kit.
[img]http://i388.photobucket.com/albums/oo330/RANGERDALEXP/JAWBONESNOW11jpg-1.jpg[/img][img]http://i388.photobucket.com/albums/oo330/RANGERDALEXP/aniranger_blue11.gif[/img]
All data and information provided from my postings is for informational purposes only. Rangerdalexp makes no representations as to accuracy, completeness, currentness, suitability, or validity of any information on this site and will not be liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis used for reference only.