Yama49601
New member
Why is it that different brands of triple pipes call for different jetting? Is it just because of flow? If so, then wouldn't the brands that say to use bigger jets make more power than the brands that say to use smaller jets? And when they call for specific jetting, are they usually talking about a bone stock motor other than the pipes being added? I'm just curious because I've read on here about having to possibly change jetting with aftermarket reeds too. You'd think that the companies that make these pipes would want to advertise the highest possible horsepower gain numbers and that they'd be testing them with motors that had other mods done to them than just throwing the pipes on. Another thing, why do they say to run premium fuel with pipes? AFAIK adding pipes can't possibly increase compression so why would you need premium?
woolyviper
New member
tripple pipes allow more air to flow thru the motor - more air needs more fuel - thus bigger jets. By recommending premium they are adding a level of safety. Some pipes are increasing volume and some are increasing velocity - most pipes require more than just changing main jets, but moving jet needles, pilots and fuel screws as well. Usually following the mfg recommendations is a pretty good start.
JeepTherapy
New member
I have asked the same question before. Why do some mfg recommend 167.5 (bender)and the next mfg recommends 155s (I think jaws). I think the answer was given that because of the better flow between some mfg pipes. I think part of the issue is some of the mfgs waste a bit more fuel to be on the safe side. As for the compression increase I believe that has to do with the back flow from the pipes effectively increasing compression at speed?
Yama49601
New member
Thanks for the replies. I was just curious.