True-Track: What the hell?
Road Warrior
Joined: Jul 2008
Posts: 1,286
Likes: 5
From: Arizona
I believe the odd handling characteristics of the Dyna Chassis are due to the fact that the swingarm mounts/pivots on the transmission case, which is bolted directly to the engine and both the engine and transmission are rubber mounted. There is a dgreee of this movement that is relayed to the swingarm. That is what the True Track is designed to deal with. The FXR was considered by many to be the best handling HD ever made. It was also rubber mounted, the difference was the swingarm pivot was mounted to the frame not the swingarm.
Tech23
Tech23
Road Master
Joined: Jul 2008
Posts: 1,197
Likes: 0
From: The wild, wild, west.
I believe the odd handling characteristics of the Dyna Chassis are due to the fact that the swingarm mounts/pivots on the transmission case, which is bolted directly to the engine and both the engine and transmission are rubber mounted. There is a dgreee of this movement that is relayed to the swingarm. That is what the True Track is designed to deal with. The FXR was considered by many to be the best handling HD ever made. It was also rubber mounted, the difference was the swingarm pivot was mounted to the frame not the swingarm.Tech23
. When I did find out about it, I was a bit alarmed, and suddenly aware why my bike swam like a fish (best way I can describe it), most noticeably here in the OC on the long, higher speed sweeping freeway interchanges, which I am extremely familiar with from regular travel, and from pushing the limits with on my last bike (pictured). So, anyone who is comfortable with their swingy not being frame mounted, and has no problem with it, prolly rides in straight lines.
Intermediate
Joined: Jul 2008
Posts: 41
Likes: 0
I tested the bike before and after the install. Having held an AMA pro license, I understand suspension and chassis setup. I ran the test on two different types of curvey paved surfaces. One was smooth blacktop with some tight corners, elevation changes and long sweepers. The speed limits on the road vary from 20 MPH to 55MPH in the straights. I ride the road freuently and with the Sputhe, I could carry much more speed through the corners and other than a little tire flex, which happened before the install also, I could hold a line much better and the suspension could do its job better because it is not getting sideloaded as much when the isolators are flexing. The other road is a CA highway that I drive every day. It is in poor condition and in a straight line the bike feels about the same but on a rain grooved turn/overpass I could carry much more speed(110 MPH compared to 89 MPH). I still experienced tire flex but not as bad. My next test is my Radial tire swap/30 tooth trans pulley.
I need to send Mudpuddle my write up on my dual disc conversion and some photos of my bike.
I need to send Mudpuddle my write up on my dual disc conversion and some photos of my bike.
Thread Starter
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Road Warrior
Joined: Dec 2008
Posts: 1,530
Likes: 1
From: Upstate, SC
Well I couldn't agree more. To the peeps here that say nay, or don't get it, I don't get (READ: Understand) them (you). And, I'll admit I bought my first and only harley without realizing that the swingarm pivot was mounted to the tranny. When I did find out about it, I was a bit alarmed, and suddenly aware why my bike swam like a fish (best way I can describe it), most noticeably here in the OC on the long, higher speed sweeping freeway interchanges, which I am extremely familiar with from regular travel, and from pushing the limits with on my last bike (pictured). So, anyone who is comfortable with their swingy not being frame mounted, and has no problem with it, prolly rides in straight lines.
. When I did find out about it, I was a bit alarmed, and suddenly aware why my bike swam like a fish (best way I can describe it), most noticeably here in the OC on the long, higher speed sweeping freeway interchanges, which I am extremely familiar with from regular travel, and from pushing the limits with on my last bike (pictured). So, anyone who is comfortable with their swingy not being frame mounted, and has no problem with it, prolly rides in straight lines.
Cruiser
Joined: May 2008
Posts: 218
Likes: 0
From: Detroit-ish
-From the site-
"Without PosiTrac our test bike was noticeably twitchy at about 90 mph. Above 120 or so the instability was positively nerve racking. After installing the PostTrac the bike tracked like it was on rails up to an indicated top speed of 133 mph."
if these are the speeds that are improved by this device, I wont have any need for it, if I am entering a turn at 90, its because I am in a race car and wont need to worry about my bikes handling
much less at 133?!?!?! for F**k sake! come on folks
"Without PosiTrac our test bike was noticeably twitchy at about 90 mph. Above 120 or so the instability was positively nerve racking. After installing the PostTrac the bike tracked like it was on rails up to an indicated top speed of 133 mph."
if these are the speeds that are improved by this device, I wont have any need for it, if I am entering a turn at 90, its because I am in a race car and wont need to worry about my bikes handling
much less at 133?!?!?! for F**k sake! come on folks
Tourer
Joined: Aug 2006
Posts: 465
Likes: 1
From: Long Beach, CA
-From the site-
"Without PosiTrac our test bike was noticeably twitchy at about 90 mph. Above 120 or so the instability was positively nerve racking. After installing the PostTrac the bike tracked like it was on rails up to an indicated top speed of 133 mph."
if these are the speeds that are improved by this device, I wont have any need for it, if I am entering a turn at 90, its because I am in a race car and wont need to worry about my bikes handling much less at 133?!?!?! for F**k sake! come on folks
"Without PosiTrac our test bike was noticeably twitchy at about 90 mph. Above 120 or so the instability was positively nerve racking. After installing the PostTrac the bike tracked like it was on rails up to an indicated top speed of 133 mph."
if these are the speeds that are improved by this device, I wont have any need for it, if I am entering a turn at 90, its because I am in a race car and wont need to worry about my bikes handling
much less at 133?!?!?! for F**k sake! come on folksI doubt my dyna will do 133, and even if it could, I would 't be taking it there. I gather from the quote they were taking about a 'test' bike, probably on a test track. Nonetheless, as others have indicated, you don't need to to run any where near 133 to experience the wallow.
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Cruiser
Joined: May 2008
Posts: 218
Likes: 0
From: Detroit-ish
I doubt my dyna will do 133, and even if it could, I would 't be taking it there. I gather from the quote they were taking about a 'test' bike, probably on a test track. Nonetheless, as others have indicated, you don't need to to run any where near 133 to experience the wallow.
Road Warrior
Joined: Jul 2008
Posts: 1,286
Likes: 5
From: Arizona
Well I couldn't agree more. To the peeps here that say nay, or don't get it, I don't get (READ: Understand) them (you). And, I'll admit I bought my first and only harley without realizing that the swingarm pivot was mounted to the tranny. When I did find out about it, I was a bit alarmed, and suddenly aware why my bike swam like a fish (best way I can describe it), most noticeably here in the OC on the long, higher speed sweeping freeway interchanges, which I am extremely familiar with from regular travel, and from pushing the limits with on my last bike (pictured). So, anyone who is comfortable with their swingy not being frame mounted, and has no problem with it, prolly rides in straight lines.
. When I did find out about it, I was a bit alarmed, and suddenly aware why my bike swam like a fish (best way I can describe it), most noticeably here in the OC on the long, higher speed sweeping freeway interchanges, which I am extremely familiar with from regular travel, and from pushing the limits with on my last bike (pictured). So, anyone who is comfortable with their swingy not being frame mounted, and has no problem with it, prolly rides in straight lines.Tech23.