| Author | Message | ||
     Vagelis46 |
It certainly does make a diference and I strongly recommend fitting one, because : 1. The fan hardly ever comes on, even when you switch the bike off! The engine runs much cooler. 2. The engine makes more power ! Since it never overheats, even at sustained full throttle. So.... WHY BUELL DID NOT INSTALL ONE IN THE FIRST PLACE ????? OR WHY BUELL DOES NOT OFFER A PROPER PLASTIC ONE AS A "RACE" SPARE PART ?? Sometimes I do not get it. What are the factory people say about this ??? | ||
| Bombardier |
One of the things I do not believe that have been considered in the previous posts is how an O2 sensors works. It senses the difference in O2 between the inside and the outside of the exhaust. There is an area/hole on the outside of the sensor that detects the amount of O2 in the air. Could the RSS be directing air over this area and allowing the sensor to read correctly which could also account for the better performance encountered by those who have fitted one? | ||
| Bads1 |
Read the newest Fuell editon and it will tell you why they didn't put the scoop on. | ||
| Bad_karma |
vagelis Have you seen the rant on the XB board about the fuel article and THE RSS? Joe | ||
| Vagelis46 |
In theory I do not know, what to say. I am not talking about theoretical analysis. I am not talking about sustained idle or cruising at 10 km/h. I am talking about pushing the bike on the open road. I have been using the RSS for 2 weeks in 12-20 Celsius ambient, and the bike makes more power. I guess this is due to the lower temp of the rear cylinder, and the engine Actually I consider the RSS one of the top mods I did for my XB. Also one more thing..... The French winning with the TT, used a RSS. Actually there was picture of the winning bike with a RSS installed, on the road. I guess they also think that the RSS helped them do well in the race. I just wanted to share my personal experience with the RSS, with other members of Badweb...... | ||
| Blake |
"I have been using the RSS for 2 weeks in 12-20 Celsius ambient, and the bike makes more power." The improved performance you are noticing may most likely have little or nothing to do with the RSS. All engines will tend to produce more power as the ambient temperature decreases. Cooler air is denser air, so more air and in turn more fuel may be drawn into the combustion chamber when ambient temperatures drop. More air/fuel charge produces more power. | ||
| Blake |
Something else to consider: Cooler season gasolines may contain increased portions of highly volatile hydrocarbon/fuel constituents, which may in turn produce more power in a high performance engine. | ||
| Reepicheep |
Vagelis, how can you tell the difference given all that extra performance you are getting from your spring loaded belt tensioner? ;) | ||
| Bigdaddy |
Reep, You owe me a keyboard -- TIA. | ||
| Jayvee |
The Fuell magazine says the factory cooling scoop is better for the rear cylinder at idle and "parade duty" but it carefully avoids comparing factory to aftermarket for high speed or sporting use. "Parade Duty" seems more the province of the Harley big twins, not Buells. If you don't plod along, and you're not a Shriner, not much argument against it, even from Abe. Factory has to consider every possible use, in every sort of weather, not what's best only for some. | ||
| Sarodude |
Which issue of Fuell is it in? Winter 2007? -Saro | ||
| Jayvee |
Whichever one I just got in the mail last week. | ||
| Vagelis46 |
Reepicheep, "Vagelis, how can you tell the difference given all that extra performance you are getting from your spring loaded belt tensioner? ;)" Is this sarcasm and what is your point exactly ? | ||
| Vagelis46 |
I agree that low ambient temperatures help the engine make more power. But I am sure the RSS helps the engine as well. I think is like the any other performanse mod. Unless you try it, you never know. | ||
| Al_lighton |
An RSS will not change the oxygen content of the air reaching the O2 sensor. It will likely result in more AIR flow reaching it, but shouldn't have any effect on the O2 sensors performance. An engine will theoretically operate with greater efficiency, and therefore generate more power, with a greater delta T in it's operating cycle. From that viewpoint, an RSS might actually diminish power, not enhance it. However, running an engine too hot can diminish power for other reasons (i.e. detonation). I understand what Abe wrote, makes sense. If i did parade duty in hot weather on my bike, it might be a convincing reason why an RSS is bad. But I don't use my bike that way. My fan on my 06 Uly was on continuously while driving on the highway with no RSS, indicating that the rear cylinder head temp sensor had reached 428F but not cooled down below 356F. I've logged engine temperature for many miles across many throttle positions and RPMs with a PDA running VDSTS and watched the thermal profile. In moderate ambients (75-80F), it would hit 428F, kick on the fan, and then the temp would drop to 370-380F and stay there. I don't have that same data with the RSS on yet, because I had the micron on my 06 Uly and couldn't run the RSS byt he time I had the datalogging gear. But I'll be doing that test with my 08 Uly with an RSS soon. I have run the bike prior to the Micron with the RSS, and the fan would not run continuously on the freeway, indicating that it had least pulled the temp below 356, and not allowed it to reach 428F after the fan went off. One thing that was absent from Abe's response, but appeared here on badweb (in a belt tensioner thread, of all places) was that Buell had tested an RSS and couldn't pass emissions with it. As indicated above, an engine runs more efficiently when it is hotter. The 08 engines now have fan specs of ON at 455F, off somewhere like 375 or so (don't have my manual here). 08 was an emmisions law change year, so it would not surprise me if the change in fan set points was due to that emissions requirement. It also would not suprise me if the additional temperature has a negative effect on overall reliability. Increased temperature generally has that effect in most physical systems. But Buell HAS to pass those emissions tests or they don't sell a motorcycle. So I will run an RSS on my 08 Uly. I'm going to run a drummer on it, so I can keep the stock header. I'll do those temp log tests and report back here when I do. Al Al | ||
| Vagelis46 |
I run my RSS with Micron headers, since I cut the lower part the RSS, no problem. | ||
| Kuuud |
Makes sense Al. I have a lot less technical knowledge, but always figured the HUGE increase in right-side heat my '06 Uly displayed over my over XB's was due to the stricter emissions. I HATED riding my Uly at slower speeds in hot weather. Even in hot weather, on the highway I rode around with my knee in the breeze. I can only describe the right-side heat level as INEXCUSABLE. I bought a RSS and it made a MAJOR difference. I rode the ULY constantly in the summer of '07. The fan operated less and I no longer worried about blistering my inner thigh through my jeans. At first I thought the RSS price was too high for a "piece of plastic", but it's worth every penny. It is the most significant modification I have made to the bike. Oh, I run a Special Ops pipe with an '07 download and an 'opened up' airbox. The stumbling under cold acceleration is much better than before these mods (but not quite 100%). Bret | ||
| Its_a_buell |
I need some replacement parts for my '03 XB9S. Primarily I need the air scoop and the oil cooler shroud. anyone know a good place where i can find stuff like this? I've tried ebay but it's hit and miss. Also, I've heard a lot about switching the intake to the right side of the bike. whats the deal with that and where can i find the goods? any help would be appreciated | ||
| 2008xb12scg |
Why would the RSS be bad on parade duty? It seems like it should work better both ways. | ||
| Bombardier |
When the airflow from the left is the same as the right it stops any air flowing over the fuel rail. This raises the fuel temp and in some cases will vapour lock it. | ||
| Al_lighton |
When you are moving at speed, the static pressure on the front of the scoop results in enough airflow VOLUME that the air speed across the fuel rail is high, resulting in a high convection coefficient. But in a parade duty situation, in high ambients, the fan is really the only source of that airflow. With a tight scoop like the stocker, air velocity remains high. But with a RSS, the added cross sectional area results in lower velocity due to the lower fan flow volume, and therefore a lower convection coefficient at the fuel rail. I've never experience vapor lock on my RSS equipped bike. But I'm not a shriner doing parade duty in phoenix, either. I pretty much am always moving (lane splitting is legal here), and I'm rarely riding in 100F plus weather anyway. I've done enough temperature logging with a PDA to convince myself that for my use, the RSS is a good thing. Al | ||
| Billyo |
Hey Al, I got my RSS from you a while back and love it, except that my left thigh gets really hot now. I've got to stick it out in the wind for cooling every few minutes. Any ideas on how to stop the air from blowing out the left side? I tried sealing up between the body/seat/frame with fire blanket but don't want to put too much in there because it will burn, stink, get brittle and break off. | ||
| Runswithlightning |
Has anyone made their own RSS. If so out of what and pics please. |
