I just bought a brute force cold air intake.....................but been workin and aint had time to install...........hope to this weekend. I think my next step is gonna be cat back system. Any ideas on which one?
When all else fails,see what your local muffler shop can do for you,it don't cost anything but a few minutes,you may be surprised.I looked at all kinds of after market exhaust for the jk,you would think they were made of solid gold with the prices they charge :shaking:hey lohchief, thanks 4 the info. I just talked with a friend of mine he just put on a Banks cat back......sounds good but kinda pricey. I'm gonna save up 4 a while and do a little recon at the San Antonio 4 wheel parts store.
I have been running aftermarket (flowmasters)exhaust and free flowing filters since 03 and I have found that the engines computer compensates for the increased flow and mixture adjustment(using the o2 sensor) without a problem.On any carburated bike (I build only harleys so that is where my experience is) the stock carbs haven't come with adjustable mixture control for years,all of the fuel injected models constantly are adjusting the mixture from cold morning starts to high altitude driving with no problem,UNTIL you free up the intake and exhaust and then they could stand to be remapped....after the intake and exhaust mods,imho.Doing the remapping or programming before the intake and exhaust mods doesn't get a whole lot done for the money you spend,and you end up doing them anyways.I find that the engine is just about worthless below 2K RPM. This probably doesn't show to much on the auto but on the manual is becomes painfully obvious real quick. This is usually caused by a lean condition that is required to meet the EPA standards. Unfortunately, freeing up the air flow on either end just makes this condition worse. Every motorcycle I have owned in the past 12 years or so has required rejetting or some kind of device to reprogram the fuel injection in order to get the fuel air ratio right. I guess I'm going to have to do this dance with my Jeep as well. I have used Power Commanders on my motorcycles for years. They have lots of maps you can use or you can make your own. Do any of the products available (or soon to be available) for Jeeps allow you do do this?
Maybe jap carbs on jap bikes are adjustable,but not for over 20 years or more on harleys.You have to do some drilling to remove plugs to do a jet change,but you also need to adjust the mixture and that you can't do with the stock kehnien(sp) carbs.Even back in the day when evos first came out,most of our customers had us pull off the garbage kiehnens and put on the then new S&S super E carbs.Jet em right,warm em up,and dail in the fuel/air mixture and your golden forever.Being an outlaw shop the factory would void the warranties on new bikes so we didn't work on them too much.All of the bikes we'd build for our customers would get super E's or the larger G's depending on engine size.We finaly closed our shop going on three years ago and retired.Back even further harley always used carbs that were fully adjustable,but some without a accelerator pump.All Japanees carbs are adjustible. You just pull out the main or pilot jet and replace it with a different one.
I have an 08 FLHS. It ran so hot you could hardly sit on it if you weren't going over 40 mph. It also surged badly at low throttle settings like when in stop and go traffic or a parking lot. The first thing I did was add a high flow filter and PC III. I kept the stock pipes because I like the sound they make. The PC III richened it up and made it an intirely different bike. Easy to ride slow and the heat problem was gone. I don't care much about HP numbers, especially on a Harley. I just want it to run right and it seems that with today's emissions standards, they are leaned out so badly that they are barely driveable. So, you may not gain much in terms of horse power or torque by messing with the FI map on a stock engine, but you sure can make it behave a lot better. From what I can tell, the Jeep suffers from the same issues. Sure wish I could just open up my lap top, change a few numbers here and there and load it into the Jeep and see what happens. I'll bet I could have it running right in a couple of hours.
Andy,I don't know what a PC III is.Yep, that's what I meant to say. Jap carbs on jap bikes. I know very little about Harley carbs. I do know how to tune an engine to run right though and it pisses me off when I can't mess with it myself. I want a PC III on my Jeep or something that allows me to do that a PC III allowes me to do. So, does anyone make something like this?