2000redrocket
Pro
Posts: 1662
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posted September 26, 2009 06:56 AM
about time i got it.
at cecil md i got my first 9.4xx pass with a 9.49 with a 1.556 60ft and 4.05 330ft. the run was odd some with only 143mph. i think i need to lower the bike. it lifted most of the time i went for it.but one little blip and it comes down. i guess it could be worse. i like riding to the track. do not know what slaming it will do to me riding there. (maple grove)
shane they asked for my licence. go figure.good you did not risk it. good air day track at 300ish feet. maple grove is around 750ft.
  
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Shane661
Needs a life
Posts: 11494
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posted September 26, 2009 07:48 AM
Good going! How much did you say you weighed?
Glad I didn't come out...or they would have sent me home for sure! 
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2000redrocket
Pro
Posts: 1662
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posted September 26, 2009 08:11 AM
about 165 ready to go.talked to a guy at brock about drag shocks and their worth. i do not know much about what settings except to have less compression and more rebound on extended bikes to help get the rear settled down. he sounded like who knows what ever works for you. i thought i would get a cut and dry this is the setup like learning how to bowl. stand here , throw the ball over that and move till you get the pin you want and then it is like clock work.
i was sort of dissapointed on asking about a 1300 dollar shock to see if it helps keep the front down due to xxx and it helps traction due to the shocks xxx. i know it is needed on longer bikes. he said i am border line wheelbase at 4.5" needing one and seeing real benifits though it will help. i just would like to know the how it helps( bet the more adjustability thing) and the how you adjust it for this problem or that.
i am done bitching now i guess.
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Shane661
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posted September 26, 2009 08:42 AM
 Edited By: Shane661 on 26 Sep 2009 16:43
Basically the shock can help by keeping the rear of the bike planted for a longer period of time with the rebound. If you get long with the wheelbase you can even overwhelm the compression settings of a stock shock.
I don't think you need a $1300 shock...maybe a newer stock unit, or have your stock one revalved if you want. You a pretty light and the bike is not that long.
I have a Penske drag shock, and I paid around $850 if I recall.
Shane
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2000redrocket
Pro
Posts: 1662
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posted September 26, 2009 08:55 AM
it makes sence being all about leverage and the fact we lengthen the swingarm longer than it was valved for. we got a guy keeny up here that does shocks. maybe i willask him about revalving it for me.
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Shane661
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Posts: 11494
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posted September 26, 2009 08:57 AM
Edited By: Shane661 on 26 Sep 2009 16:58
Another aspect of the aftermarket shock is the range of fine adjustability. I have not begun to tune my suspension (other than adding preload for Maxton). Ultimately I would like to see my bike turn mid 1.3 60 foots. At that point I think suspension adjustability will be more critical.
By the same token, guys are going 1.3's with a stock shock....so, go figure...
Shane
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chavcat
Zone Head
Posts: 524
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posted September 26, 2009 10:23 AM
2000 - not to steal the thread but as PM's not working and I am also interested in shock info: your 12 is 4.5 over correct and you weigh 150 without gear? Gearing? Other mods?
Also Shane - how much do you weigh? How much longer is the arm? How have you adjusted the Penske as I also have a Penske.
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Shane661
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Posts: 11494
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posted September 26, 2009 10:39 AM
Edited By: Shane661 on 26 Sep 2009 18:40
I am 218 in gear. My bike is +6". All I have changed from the way it came out of the box is the preload. I only did that because it was hitting the undertail at Maxton.
My shock is a drag shock, it uses a different type of damping circuit than a roadracing shock. Mine is much heavier on the rebound than a roadracing shock.
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2000redrocket
Pro
Posts: 1662
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posted September 26, 2009 10:50 AM
my bike has a muzzy ti system and some advance at wide open say 3 deg i think. gearing now is 17/50 thinking of going to the 51 sprocket soon. otherwise stock filters, nothing else except the muzzy ti. i have the rr mod ecu i tune my self.
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tcchin
Zone Head
Posts: 867
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posted September 26, 2009 12:30 PM
quote:
My shock is a drag shock, it uses a different type of damping circuit than a roadracing shock. Mine is much heavier on the rebound than a roadracing shock.
The components are the same, but the shim stack and maybe the bleed valve are different. My suspension guy (Stig Pettersson, Pettersson Pro Suspension, http://www.ppsracing.com) has revalved many roadrace shocks, including OEM shocks, into drag shocks. Drag shocks are easy, because they only cycle once per pass, as opposed to roadracing shocks, which cycle several times per corner. If you contact Stig, tell him I sent you.
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Shane661
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Posts: 11494
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posted September 26, 2009 12:47 PM
Edited By: Shane661 on 26 Sep 2009 20:54
quote:
quote:
My shock is a drag shock, it uses a different type of damping circuit than a roadracing shock. Mine is much heavier on the rebound than a roadracing shock.
The components are the same, but the shim stack and maybe the bleed valve are different. My suspension guy (Stig Pettersson, Pettersson Pro Suspension, http://www.ppsracing.com) has revalved many roadrace shocks, including OEM shocks, into drag shocks. Drag shocks are easy, because they only cycle once per pass, as opposed to roadracing shocks, which cycle several times per corner. If you contact Stig, tell him I sent you.
Interesting. Penske passed around several different assemblies, one for each type of damping circuit (if I recall correctly).
In checking my literature, it notes three types of pistons:
Linear
Digressive
Velocity Dependent
I don't know much about this stuff, but there were definitely several types of assemblies with different parts.
Shane
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Shane661
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posted September 26, 2009 12:52 PM
If anyone wants to get more basic tech on the Penske shocks, you could call them and ask them to send you this:
It was part of the documentation that they gave out at the seminar.
Shane
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2000redrocket
Pro
Posts: 1662
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posted September 26, 2009 02:34 PM
wow.
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tcchin
Zone Head
Posts: 867
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posted September 26, 2009 04:30 PM
Those are the pistons onto which the shims mount. The pistons are easy enough to change once the shock has been opened for revalving. Note that the shaft velocities in drag racing are made so lopsided by the light compression and heavy rebound damping that a lot of this stuff is kinda moot. The two-stage blow-off valving is kinda old now, and has been replaced by better and simpler technology - at least in the Ohlins line. Also, there are four-port and five-port pistons that impart a different deflection profile onto the shims than the three-ports shown. If anyone is interested in the Ohlins manuals, they are available online at www.ohlins.com. Also, there's a really good reference manual on the effects of valving on force/velocity here: http://www.motorsportsspares.com/files/inside_the_tt44_work_section_and_valving.pdf
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shiphteey
Needs a job
Posts: 2529
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posted October 01, 2009 12:32 PM
2K, good job on breaking under the 9 Fiddies....
So how bout them 8s??!?!?!?
A.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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tshultz
Zone Head
Posts: 556
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posted October 01, 2009 12:46 PM
quote:
2K, good job on breaking under the 9 Fiddies....
So how bout them 8s??!?!?!?
A.
He's got the 1270 kit may-bee next year??
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shiphteey
Needs a job
Posts: 2529
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posted October 01, 2009 01:31 PM
Run a 19 on the front and launch from the rev limiter.....showly DEN it would do it....innit?
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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2000redrocket
Pro
Posts: 1662
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posted October 01, 2009 08:21 PM
and end up on my ass.
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