Fuel Issue after mods

[High Ranger]

All right gentleman..... I have an 05 that I put a set of D&D show and go slip on's on and the milage was fine after that, now I just installed frame sliders and a K&N air filter and I went from 50mpg to something around ~25mpg. Exhaust smeels really rich, but not much worse than it did off the showroom floor. Should I install a power commander or get the computer re mapped or something to go with all the free flowing intake and exhaust or is it something else?

?
Thanks Guy's.

Mike

 

[LadyHawk]

I would get a PC and have it custom mapped..

Husband had the same problem after installing full exhaust, he had it custom mapped and went from 30 mpg to around 42 mpg.

 

[thunder]

Do You have a TRE on it?

 

[bigdr]

Some of thoses frame sliders can gobble the gas..

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[omslaw]

Ya know 'Ranger...I've experienced something similar.

You'll probably find that the majority of folks around here will say that a PC won't do ANY good unless you have a full exhaust.

Well, when I installed my bolt-ons and the k&n, I noticed a difference! It's running rich and I've lost a little power on the low-end. Just so I wasn't imagining it, I re-installed the stock cans and realized the 'pep' was back on the low end.

I'm no engine expert, but I don't understand why a PC wouldn't be needed (preferred). Afterall, the stock ECU is tuned for the stock, baffled (read: restrictive) cans. When one installs aftermarket, unbaffled cans - some of the exhaust restriction has been removed. Granted, there is still restriction in the X-pipe, but there HAS to be some restriction removed when getting rid of the stock cans. Heck, I had to get rid of the PAIR valve to stop the 'backfire' with the bolt-ons.

Anyway, I'm gonna hafta save up $$$ to get a PC. If a PC wouldn't do anything...why would DynoJet have maps for various brands of bolt-ons?

Good Luck, keep us posted!

 

[shenoyp]

All right gentleman..... I have an 05 that I put a set of D&D show and go slip on's on and the milage was fine after that, now I just installed frame sliders and a K&N air filter and I went from 50mpg to something around ~25mpg. Exhaust smeels really rich, but not much worse than it did off the showroom floor. Should I install a power commander or get the computer re mapped or something to go with all the free flowing intake and exhaust or is it something else?

?
Thanks Guy's.

Mike

A custom MAP might not be required... getting a PC and installing one of the pre loaded MAPs should do just fine. I installed the pre-loaded MAP when I had the Yosh cans on Elenor... she ran good!!

 

[High Ranger]

Do You have a TRE on it?

Not sure what the tre is so I would say probably not. Only mods are a pair of slip ons and a k&n filter. Mileage stock was ~49 and some change, unchanged with the addition of the slipon's but as soon as the k&n went in the milage went to chit.



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[dogman]

Take the kn out and put your stock filter in..The reason it probably smells so rich is because of all the oil on the filter..

 

[Bergster]

If you over oil the K&N it becomes restrictive and doesn't breath well at all. If that happens it will be rich and you will loose mpg. seen it a bunch of time with cars.
just my 2 cents.

 

[drumminman]

I've read that the stock filter flows more air than the K&N. Try putting it back in.

 

[MoosesBusa]

K&N's aren't really worth the money. I have one in my scoot because a buddy "helped" me with the air box mod to help it breathe mre and the ony thing that doesn't fall thru the hole is a K&N. My mileage dropped too but I attributed it to my heavy right hand! When I'm on the throttle she gets really thirsty! Sustaining 140+ yo can literally watch the gas gauge drop!

My PC is on the way and perhaps I'll get a mile or two more per gallon but If I don't ... who cares!?! The Harley is for putting around and conserving fuel!