| Author | Message | ||
     Sarodude |
To any Blast tinkerers out there... Have any of you tried to stuff the airbox (I don't care if it's with elegantly carved foam or used toilet paper) to see what effect that plenum volume has on the power band? I gotta get myself some sort of dynoing equipment before I die. -Saro | ||
| Xgecko |
Aaron did some playing with the Airbox whilst preparing the LSR Blast. His main discovery was that with the airbox empty (no filter) there was a increase in HP. No appreciable change from OEM to K&N filter...I think | ||
| Aaron |
Actually, the airbox killed the power, didn't matter if there was a stock paper element, a K&N, or no element at all. Opening the airbox (or removing it) picked up a couple horsepower. But that was sitting still. I honestly don't know how it works with the bike moving. There's a scoop on the left side so perhaps it actually helps. Also, later I learned that without the airbox, it really likes the 1.5" venturi ring that Tat sells. AW | ||
| Sarodude |
Yeah, but has anyone STUFFED the airbox? The whole bottom of the airbox is basically a large resonating chamber. I'm curious what would happen to the powerband when that was taken away - and all the rest of the standard restrictions were left in place... I believe that many things we think are totally unnecessary with our short-ish sight (MORE POWER!) are there for a reason - otherwise the factory wouldn't bother spending money on it. Part of the airbox is probably for evap emissions. However, you don't need so much plenum just for evap containment, do you? Now, what's this about a 1.5" venturi ring? Where is that 1.5 measured? I'll have to scoure the site... -Saro | ||
| Aaron |
"Where is that 1.5 measured?" I measured it in my shop. It should be the same in yours though. 1.5" long. Same o.d. and i.d. as your stock one. | ||
| Phillyblast |
>>I measured it in my shop. It should be the same in yours though. ROFL So today it was nearly 70 degrees outside, after a period of rain and cold. I was almost disappointed to see it - part of me is just itching to take the bike apart. The rest of me is calmly making a list of parts and planning the mods. Anyone done suspension mods to their Blast? | ||
| Xgecko |
Aaron, is that what you bolted you filter to for the LSR runs | ||
| Aaron |
yes. | ||
| Sarodude |
Aaron- I do suppose the question COULD have been more clearly asked...  -Saro | ||
| Aaron |
I'm sorry, I couldn't resist! | ||
| Xgecko |
OK Aaron since you are in an answering mood what did/do you use for for an Air Filter on the LSR Blast? I keep flip floping back and forth on the airbox issue though I'm really likely to stay with the Airbox now that I've bought the K&N filter...whether or not I can gain more HP from the Change | ||
| Fssnoc2501 |
Aaron, My air cleaner mod is about 2 1/4 " long with a 55 degree bend. By my seat of the pants dyno it has not only improved power it has also increased / widened the power band. I was wondering your opinion of this as you have much more experience in tuning Buells than I. I realize that the Blast you have has more mods than mine, but as the King Blastard your opinion is valued. Also how difficult is it to remove the auto enrichener and replace it with a manual choke. My Blast tend to be too rich after my mods when cold. Ray | ||
| Fssnoc2501 |
Aaron, Good luck at the salt when you go again. Dad & I are cheering for you and Susan to blow away a few records. Ray | ||
| Aaron |
Tony: I used a Uni sock type filter clamped over the venturi ring. I never dyno'ed with it in place, but I ran the bike up and down the driveway (1/4 mile) and it seemed to run fine. Then we got it out to the salt flats and it fell on it's face, it wouldn't harldy pull past the straight pipe induced rich flat spot at 4500rpm. Pammy pulled it off, and backed out a bunch of jet, and it cleaned up but wasn't particularly fast. That's when Susy set the 104 record. The next day, Pammy put some jet back in it and voila, it came to life, started really ripping like it had been in my tuning. And then death. The new rev limiter arrived yesterday, I won't make that mistake again. Ray: I did a fair amount of experimenting with intake length upstream from the carb. Much like the pipe, the length of the venturi and the placement of the powerband go hand in hand. The way I disabled the auto choke was to wire it to the horn button. I figured we wouldn't need a horn out there. So when you held the horn, the enrichener was on for starting. But later in my development I found a little more power with a Mikuni HSR42, so I dumped the CV anyway. Thanks for the good wishes. We're still scrambling to line up another head, and get it all back together in time. We'll see. AW | ||
| Ramon |
Hey everyone, I just got my Blast back from the shop. I had the first service done as well as a new V & H pipe, K & N jetting, K & N air filter, and the shop threw in the Dyno tuning in for free (my tech just took a dyno class and wanted to use my bike as the guinea pig). I am very happy with the way my bike performs. However, the print out of the Dyno indicated that I only had 29.8 horses (after the modifications). My question is, how can Buell claim the bike has 30 - 34 horses if the Dyno says 29.8? Thanks guys, -ramon | ||
| Englishman |
Doesn't Harley® measure their horsepower at the crank? | ||
| Xgecko |
Yup at the crank it's 34hp IRL its high 20s. I once won/lost a dyno shootout as the "Lowest HP" bike though only by 3hp to a twin (his bike was sad) I got me $200 worth of accessories. I need the dealer to do that again soon. Hopefully they will when they get their Vrods in. | ||
| Joey |
Pirelli users! Does the tire last longer? I've noticed it seems to handle a little better, but managed to neglect to check the tire pressure. When I finally did, it was at 28 PSI! It has a flat spot, needless to say. I ran over something on the highway. I didn't have much money to get a new tire, so I fixed it myself. Seems I have a problem keeping air in my tire! If the HP is 29.8 at the tire, doesn't that put the engine at close to 40? | ||
| Xgecko |
well the first Pireli that I had lasted longer that both of the Dunlops (put together) before it was cut to the belt (but not holed) in a crash. Buell says 34 at the crank for what it's worth...how do you measure HP at the crank??? I've never understood this. Hummmm must check Tire pressure at next fill up (tommorrow) | ||
| Ramon |
I think the plastic license plate holder for the Blast is way over-sized. Does anyone know of a good way to eliminate it? -ramon | ||
| Xgecko |
Dremel | ||
| Phillyblast |
From the dept. of bizarre noises: Noticed a clacking today on deceleration, esp. in city riding, going from stop light to stop light. Let off the gas, and within a certain rpm range, as it winds down, there's a "clack-clack-clack" - downshift, and it happens again, in the same rpm band. coming from the right side of the bike. Any suggestions/hypotheses? Haven't voided my warranty yet, so can still take it to the dealer, but if anyone knows off the top of their head (the old "known issue" thing) I'll fix it myself. Service Manual hasn't arrived yet, though. thanks david | ||
| Jimalexander |
phillyblast. I have a brand new 2001 manual for sale for $40.00. I'm in Philly. Jim. | ||
| Phillyblast |
Jim, I still have your email - I'll ping you. You sell the Blast(!) tm? | ||
| Jimalexander |
Phillyblast, I am getting geared up for my winter in Florida and hopefully the Southwest. I'm going out to my old cruising grounds near Newtown Square this week and finally give the Blast a good run through the twisty's out there and get in some quality riding time. I've only put on 70 miles around here. My real riding will be this winter in much less conjested areas than up here. Jury's still out as to whether I like the bike. The recall sprocket is making a loud whirring noise at speed that wasn't there with the 73 tooth sprocket. If you are interested in the manual and stop by maybe you could ride it and tell me what you think of all the various noises. Jim. | ||
| Prof_Stack |
Phillyblast - your downshifting noises could be coming from a primary chain that is too loose and flapping on the engine case. Try tightening it a couple of flats and check it out. I did that with mine recently and a noise similar to what you describe went away. Also remember that when it gets too tight the whining noise is very clear. My Buell tech just followed the manual at the 500 or 1000 mile service (I forget which) and got the primary chain way too tight. Now I take care of that adjustment. | ||
| Pinkpank |
Phillyblast - (Just got back from West coast to pick up a convertible) Yep, wheelie. He's a small guy. Apparently, the rotational mass of the engine is enough to bring up the front end for him. Time to go ride my Blast, eh? It's been sitting for two weeks! ;-0 | ||
| Phillyblast |
Prof - thanks - was leaning in that direction, since it was following rpms, not bike speed. Jim, check your email. Pink, welcome back. Go for a ride. | ||
| Pinkpank |
Yah, if I had time! I got back from a 3000 mile trip driving the S2 Cab from Portland to Chicago on Sunday night, and I haven't even seen the car or the bike since then. Too busy. ;-( Has anyone bought the rear grab bar/rack that was posted about? (Lessee . . . www.ventura-hsi.com, I think). $89 for the rails, $17 or $39 for the handle or rack+handle. I'm tempted. Aaron, I have a cylinder and piston that looks a lot like yours in that posted picture. Except it's a lot more expensive to fix in a darn 4-cylinder Turbo auto engine than it is in a Blast, I think. ;-0 Cold weather, brrrr. Wonder how long I can keep riding this time? I used to go down to 0 degrees, no lower. Now I turn "pansie" even at 40 degrees. I'm getting old. ;-) Oliver | ||
| Xgecko |
Ok I've been listening to my bike more now that I have to leave 20minutes earlier in the morning (Traffic/security thing) and there is less traffic which allows me to ride faster. Anyway I think I can hear the same whine that y'all are talking about that stays in tune to the RPM's So if I back out a few Flats it should go away right???? |
