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RTI'ed at 534 yesterday......BUT.....

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by Greg72, Jan 3, 2002.

  1. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    RTI\'ed at 534 yesterday......BUT.....

    Talk about a "ghetto" RTI ramp....I rolled my floor jack under the passenger side rear tire and started lifting....you know, just to see what the 'ol girl could do.

    Well I got the tire up to around 19", but then I noticed that the passenger side FRONT brake line was stretched TIGHT! I didn't want to push my luck and rip the hose off, so my RTI adventure ended there.....

    RTI Score @ 20 degrees: 534. Not bad for a first try, and clearly there's still more flex available.


    So what length of brake lines are you "Flexy" guys using? I'm sure the lines I have were the standard upgrade length supplied with a 4" lift kit....but clearly they're not long enough. Also, how do you keep LONG brakelines from getting tangled up in the suspension? Do any of you have an elegant solution....?

    ALSO:

    Question for the "Bone stock" guys (Nathan, etc).....How many leaves are in your rear spring pack? I am still scratching my head over whether my rear springs are stock or maybe a 2" lift. The truck sits level with a 4" lift in the front, and most people insist that you need about 6" of lift at the rear to level things out.



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  2. Steve_Chin

    Steve_Chin 1/2 ton status

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Greg, maybe you can relocate your fixed points for your brake lines below the frame. A number of other guys have done that. In order to keep the lines from tangling with the suspension, I'd suggest making a bracket that bolts to the line about 1/3 of the way to the caliper from the frame. Use cushion clamps to bolt the bracket to the line. Hook a spring to that bracket, and hook the other end of the spring to the now empty hole in the frame.

    WRT the stock rear springs, mine have 5 leaves.
     
  3. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Dr. Chin,

    Thanks! By the way is that 5-leaves PLUS the overload spring, or is that 5 leaves INCLUDING the overload?

    I should have specified that more clearly in the original post. [​IMG]



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  4. BurbinOR

    BurbinOR 3/4 ton status

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Using Pro Comp stainless extended lines on my '79 with 4" lift and RS 9000's...........they came with a holder that cable ties to your shock that keeps them out of harms way. Ramped 714 with brand new springs, should be better now that I have 5 months of driving on them.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  5. Steve_Chin

    Steve_Chin 1/2 ton status

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    Re: RTI\'ed at 534 yesterday......BUT.....

    That's 5 in total, Greg.
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    Re: RTI\'ed at 534 yesterday......BUT.....

    You should get alot more. I use a 4" tuffcountry springs front and 6" rear. I can pull my left front wheel 36" off the ground till the rear started comming off. According the 4lo thats a 975 on a 20 degree ramp.

    86Jimmy 4"&35"MTRs,87 burb 4"&33"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: RTI\'ed at 534 yesterday......BUT.....

    To quote Al Pacino in "Scent of A Woman":

    WHO---HAAAA


    Wow! That's impressive! I'm not sure if my '72 has a 1000RTI in her....but I'll get some new brake lines and check it out. I have the stock rear springs (although based on Steve Chin's answer I'm not so sure) and the 4" ORD shackle flip in back, and a 4" Rough Country spring pack up front.

    After the brake lines are fixed, I suspect that shocks will be the limiting factor. What is the shock setup like on your K5? Is the the 9012 Rancho setup?



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  8. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Steve Chin,

    OK....something is not right. Either the previous owner added an "overload" leaf to the stock pack, or what I have is NOT stock.

    Here are some measurements I took DIRECTLY off the truck as it sits now:

    REAR:

    Eye-to-eye LENGTH............. 51-3/8"
    Pack Thickness (5 Leaves)... 1-5/8" (Not including overload leaf, that's another 1/2" by itself)
    Spring Pack Width............... 2-1/2"

    Calculated spring rate: 264 Lbs-In
    (It's 410 Lbs-In if you factor in the overload, but I don't think that's valid since it's not used in "normal driving")

    FRONT:

    Eye-to-eye LENGTH............. 43-3/4"
    Pack Thickness (3 Leaves)... 1-3/8" (No overload leaf in front pack)
    Spring Pack Width............... 2-1/2"

    Calculated spring rate: 719 Lbs-In


    Is it just me, or do those numbers seem grossly mismatched (Front / Rear)??? I know that there is more weight up front but that seems excessively biased toward the front!! [​IMG] What would you say is the "real-world driving experience" driving a vehicle with those kind of spring rates?

    Tomorrow, I am going to get my truck weighed at a race shop. 4 scales, one under each wheel. That will allow me to get a VERY accurate overall weight, and also get a F/R weight-bias. With that data I should be able to make some better guesses about what spring rates might make sense. [​IMG]



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  9. 69K5

    69K5 1/2 ton status

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Greg,

    Sorry its been busy here for a couple of days. My springs have 5 leaves about 1/4 maybe 5/16 thick. It also has a about a 1/2 inch thick spring on the bottom. I'm guessing the overload spring. The length on yours is right , but i'm not sure about the thickness. Well I just did the math and that is right too. So I'm not sure. Maybe the guy that had yours up in WA, OR ( I forgot where you bought it) went and bought a brand new set of stock springs that haveny sagged yet.
    nathan
     
  10. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Nathan,

    If you get a chance, could you measure the thickness of the "pack"...just the 5 leaves, not the overload.

    I am looking for a measurement to compare to my own 1-5/8" thick measurement. Once I have that, it's easy to calculate the leaf thicknesses.

    Thanks dude! [​IMG]



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     
  11. 69K5

    69K5 1/2 ton status

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    Re: RTI\'ed at 534 yesterday......BUT.....

    I went and measured. its 1 5/8 exactly.
    hope it helps
    Nathan
     
  12. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Re: RTI\'ed at 534 yesterday......BUT.....

    Nathan,

    That's good news!...........and bad news. Good because now I know that my rear springs are truly "stock".

    But "bad" if that means that they just haven't sagged yet.

    Oh well, tomorrow's visit to the "scales" will be the beginning of a new suspension adventure! [​IMG]



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>
     

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