 Down shift blurp
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Joined: Jan 2005
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A M/C mechanic frend of mine say's it unnessary to blurp your throttle when down shifting wiith a modern engine. When he asks people why they do it. They usually say that's what someone told them to do. I allways do. I thought you had to keep the engine from breaking to hard and risk losing tracton. Any Ideas?
Larry
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Re: Down shift blurp
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Joined: Jan 2005
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Learned Hand
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Learned Hand
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I would normaly increase the revs as I downshift to match the engine speed to the new gear selected, not doing so would be a much more jerky gearchange and might even lock the back wheel in wet roads. alot easier on chains as well.
As for giving it a big blurp, have not done that since riding screaming two strokes, the reason for doing it then was I believe to keep some lubrication in the engine.
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Re: Down shift blurp
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Joined: Feb 2005
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Fe Butt
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Fe Butt
Joined: Feb 2005
Posts: 20,096 Likes: 2 |
Larry,
Unless your mechanic friend is riding a Ducati or one of the Japanese sportbikes that now come from the factory with a "slipper-clutch" installed in it, I'd still(as NIbiker advised here) blip the throttle to match engine-speed with wheel-speed. Without blipping you are putting needless torque on your whole drivetrain, including the gearbox, chain, and cush drive.
Yep! Just like a good Single Malt Scotch, you might call me "an acquired taste" TOO.(among the many OTHER things you may care to call me, of course)
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Re: Down shift blurp
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Joined: Mar 2006
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Yeah, but it keeps the wear even on both sides of the clutch 
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Re: Down shift blurp
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Joined: Jun 2006
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Hmm..... all my Harley and Jap bike mechs never said to do that...Just for the heck of it, I'm going to post that question in a couple of other forums wghere I personally know folks that know what they're talking about...
When I downshift, I just back off the throttle, downshift, and ease the clutch back while rolling on the throttle to pick up more speed.... never had any problems on any of my bikes....
If I'm downshifting to stop, then blipping the throttle would add more revs and take more time.... and add more stress...
What I was told was to practice for smooth.....
at times I find myself not using the clutch, but too much of that isn't good either.
Mary
Krashdagon aka Snappy
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Re: Down shift blurp
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Joined: Jan 2005
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Loquacious
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Loquacious
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Quote:
When I downshift, I just back off the throttle, downshift, and ease the clutch back while rolling on the throttle to pick up more speed.... never had any problems on any of my bikes....
That would be my advise. Its certainly how we teach riders to downshift in the MSF courses. Ease out the clutch while rolling on the throttle and there shouldn't be any need to blip the throttle.
Arsenalfan. AKA Mark Able
Seller of fine automobiles.
Jaguar, Land Rover, Porsche of Chattanooga
423-424-4000
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 Re: Down shift blurp
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Joined: Jun 2006
Posts: 2,626
Loquacious
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Loquacious
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Quote:
A M/C mechanic frend of mine say's it unnessary to blurp your throttle when down shifting wiith a modern engine. When he asks people why they do it. They usually say that's what someone told them to do. I allways do. I thought you had to keep the engine from breaking to hard and risk losing tracton. Any Ideas?
Larry
Do it. It sounds  . Especially with open pipes. 
Plus it makes the downshift crisper, less chance of a false neutral. But it has nothing to do with breaking traction/making the rear wheel hop. When you do the blip, the clutch is pulled in, right? If you are going too fast for the gear you just shifted into, the wheel will slide/hop when you let out the clutch, no matter how you shifted.
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."
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Re: Down shift blurp
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Joined: Jan 2005
Posts: 18,825
"Lighten up, Francis."
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"Lighten up, Francis."
Joined: Jan 2005
Posts: 18,825 |
I've never blipped the throttle on my bike. They never mentioned it in the MSF course. I've never experience any problems as a result.
I have been known to do it in my car, however...
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Re: Down shift blurp
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Joined: Jan 2005
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Bar Shake
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Bar Shake
Joined: Jan 2005
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I agree with NIbiker and Dwight, I always thought a little blip made for a smoother downshift. Now I am going to have to try it both ways. 
"Catching a yellow jacket in your shirt at seventy miles per hour can double your vocabulary" Author unknown
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Re: Down shift blurp
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I always blip the throttle much smoother downshift if you get the timing right
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Re: Down shift blurp
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to me its really not about modern or old, its about achieving a smooth transition to a lower gear. sometimes a little blip is nice, like if you downshift just before a curve and accelerate thru it..how can you hoon around without blipping, your spoiling all my fun now
G
I never wanted to lead, and I never wanted to follow.
I just wanted to ride.
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Re: Down shift blurp
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Joined: Jan 2005
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Monkey Butt
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Monkey Butt
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Quote:
I agree with NIbiker and Dwight, I always thought a little blip made for a smoother downshift. Now I am going to have to try it both ways.
Ditto, will try the other way tomorrow and see if the back end locks up in anyway.. Being brought up on two strokes I suppose does not help much 
Ray(UK)
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Re: Down shift blurp
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Ok, my buddy Steve posted the real reason ...
He owns the HawyRyder's All Harley Tech Forum, but he does build his own bikes... I've actually watched him....
He's most definately not a RUB....<G>
From Steve:
"OK, you've heard the other ****** ;-) ....now here's the truth
There is NO reason to do that on any synchronised tranny....the REAL need for any of that went out back in the dang dark ages. In the olden days, when Bob ((Ed note: one of Hawg's forum "old" esteemed members!<BG>)) was learning how to drive....back when you actually HAD to "double clutch" when shifting that old truck or whatever you were tearing up the dirt roads with....you needed to get the engine RPM's up to match the rest of the driveline or you weren't ever gonna' get it into gear. I am fortunate enough to have actually driven an antique gearbox that wasn't synchronized like modern trannies....and it is an "art".
The only "reason" for it today is to listen to your pipes singing. "
Hawg Ryder
1975 80" Shovel Stroker/1993 88" GeezerGlide Evo Big Bore
Krashdagon aka Snappy
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Re: Down shift blurp
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Joined: May 2007
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Why do I do it? HABIT!! 
Yes! I am a Redneck. Any Problems?
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Re: Down shift blurp
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Quote:
Why do I do it? HABIT!!
Exactly! It became a natural thing since i was riding when i was a kid.
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Re: Down shift blurp
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Coming from sport bikes if you abruptly downshift a high compression performance bike, or even just drop the throttle you can break the rear wheel loose. That is the reason for the slipper clutch. On our bikes it is not at all a problem. There is no need to use any throttle while downshifting. I can downshift quite smooth with no throttle and no harshness or jerking on these bikes.
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Re: Down shift blurp
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Joined: Jan 2005
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Bar Shake
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Bar Shake
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Posts: 6,821 |
Steve is right.
I too have driven some of the old crashboxes, learned to drive on one as a matter of fact. Blipping the throttle without double-clutching really doesn't accomplish much.
On a full synchro automobile tranny, double clutching while downshifting will make for a smoother more positive shift, hence the heel/toe method of driving sports cars, which, FYI, originated with unsynced trannys (BTW Dwight, how's the pedal arrangement on that new replicar), but it's certainly not necessary. Especially during normal driving, or riding. In fact, I doubt that anyone here is practicing double-clutching on their bikes hmmmm?
Modern bike transmissions are constant mesh, achieving similar results as synchros in a more compact package.
Contra todo mal, mezcal; contra todo bien, también
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Re: Down shift blurp
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Big Bore
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Big Bore
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Quote:
Modern bike transmissions are constant mesh, achieving similar results as synchros in a more compact package.
Exactly. No blipping, bleeping, or blooping needed on our bikes.
However, if you downshift to second while traveling at 65mph (that holds for any other radical combination of gear/speed), I am betting your rear wheel is going to move east and west!
So here's some advice. Don't do that.
"Never underestimate the power of human stupidity" - Robert Heinlein
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Re: Down shift blurp
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Joined: Jan 2005
Posts: 6,821
Bar Shake
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Bar Shake
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Posts: 6,821 |
Quote:
Quote:
Modern bike transmissions are constant mesh, achieving similar results as synchros in a more compact package.
Exactly. No blipping, bleeping, or blooping needed on our bikes.
However, if you downshift to second while traveling at 65mph (that holds for any other radical combination of gear/speed), I am betting your rear wheel is going to move east and west!
So here's some advice. Don't do that.
I dunno Phil.
Bleeping is sometimes unavoidable.
Contra todo mal, mezcal; contra todo bien, también
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Re: Down shift blurp
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Joined: Jan 2005
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Big Bore
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Big Bore
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Yeh, but only here! 
"Never underestimate the power of human stupidity" - Robert Heinlein
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Re: Down shift blurp
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Joined: May 2007
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Saddle Sore
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Saddle Sore
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Veni Vidi Vici ( I blipped , I bleeped , and I blooped ). And blurped ? Webster resonates in his grave , as does Helmholtz .
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Re: Down shift blurp
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Joined: Jan 2005
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Old Hand
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Old Hand
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Until they start putting synchromesh transmissions in motorcycles, it will continue to be a good idea to synchronize the gears while shifting. Back off the throttle while upshifting and goose it a bit while downshifting. Multidisk wet clutches always have enough drag to make this behave exactly like double clutching a sliding gear car or truck transmission. And, like the 4 wheel variety, matching the engine speed to about what it would be in the gear you are shifting to at the speed you are moving gives the best results.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: Down shift blurp
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Joined: Feb 2006
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Learned Hand
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Learned Hand
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From 5th gear, I just pull the clutch in, let her idle, and methodically down shift all the way till the neutral light comes on, then at < 3 mph, downshift into first...
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Re: Down shift blurp
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I'm with you. It means less wear and tear on the entire driveline(if done correctly) and keeping the vehicle in the appropriate proper gear for any situation that comes up is a good idea.
You don't have to unless you want to, and I want to.
Mike Sr.
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Re: Down shift blurp
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Joined: Jan 2005
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Learned Hand
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Learned Hand
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I've always blipped my throttle before down shifting on all the Brit bikes I have owned. Why? I like the sound and I remember watching Garry Nixon race on the half mile dirt track at Middletown NY and he always blipped. If done right the sound is almost like, well the only way I can describe it is, like a bark or blatt. I love that sound when your going into a curve and you want to scrub off a little speed and you're all leaned over and BLATT! and your on the power coming lout of the curve OH GOD!!! I LOVE IT!!!
if life gives you lemons keep them because hey,free lemons.
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