peteretep Posted February 22, 2015 Share Posted February 22, 2015 does it always try to kill you with the same wall? or does it try to kill you with both sides of the track. both sides of the wall Quote Link to comment Share on other sites More sharing options...
kempy Posted February 22, 2015 Share Posted February 22, 2015 I have nothing constructive to add, but I find it ironic that your avatar is a picture of a caravan and you have opened up a can of worms. disclaimer: my experience may have been altered by inhalation of aluminum corrosion and alcohol. 3 Quote Link to comment Share on other sites More sharing options...
JoKer Posted February 22, 2015 Share Posted February 22, 2015 cup-o-concrete? 2 Quote Link to comment Share on other sites More sharing options...
sentra Posted February 22, 2015 Author Share Posted February 22, 2015 i feel like the loose caboose was highly likely the issue, however wont be able to give any closure untill??? some testing time. Iirc there is a testntune midweek at meremere so might go before nats hampton. in more interesting news, the rear diff is now welded and provided double smiles on test drive. 6 Quote Link to comment Share on other sites More sharing options...
Roman Posted February 22, 2015 Share Posted February 22, 2015 Awww damn could be keen for a pre nats shakedown at Meremere as well!Details, giz ze details! Quote Link to comment Share on other sites More sharing options...
sentra Posted February 22, 2015 Author Share Posted February 22, 2015 ah sweet yeah its on weds 5pm ill def head down http://www.framautolitedragway.co.nz/events/136-GRUDGE-WARS-III---TEST-and-TUNE-V.html 1 Quote Link to comment Share on other sites More sharing options...
Rhyscar Posted February 23, 2015 Share Posted February 23, 2015 Here's my 2c. Don't worry about the bumpsteer etc it will be fine (travel probably isn't enough to cause an issue). Preloaded springs aren't ideal I would consider taking a angle grinder to them to achieve the right height. Although keep in mind you'll be increasing your spring rate (less squat off line). Why I think this will work is that with the preloaded springs the force exerted when weight is transfered to the front is greater (spring rate measured in displacement from resting position ie kg/mm or lb/in etc) essentially the valving on your shocks is not able to control the movement of the car body as it is unloaded and therefore uneven amounts of traction between tyre and road are experienced. With less preload in the springs it will transfer weight slightly slower and your shock then only needs to worry about the weight transfer of the car, not a preloaded spring also (assuming weight in car will transfer quicker than spring will unload, either way the force will be less) Also locking diff/plate type diff will make massive difference. Torsions are pretty much shit the way they unload when weight comes off them. 1 Quote Link to comment Share on other sites More sharing options...
KKtrips Posted February 24, 2015 Share Posted February 24, 2015 I used to have a similar issue on my T-bucket and it used to make me giggle while simultaneously shitting myself. (Chegan got a healthy case of the deathly giggle shits when I took him for a burn one night) I put it down to the height of the sidewalls (mega balloon spec) doing it but never researched it that much. To stop it I would roll off the throttle gently rather than snap it off and the problem was pretty much eliminated. But Meremere being a very short runoff then I imagine that is a scary as fuck suggestion to attempt without dying. Quote Link to comment Share on other sites More sharing options...
Rookie Posted February 24, 2015 Share Posted February 24, 2015 They are preloaded because the car is too low, so cutting them isn't going to help. Also I highly doubt preload is an issue, heaps of formula cars crank the shit out of the preload to create zero droop suspension, and I'm pretty sure if it had a negative affect then they wouldn't do it. Quote Link to comment Share on other sites More sharing options...
peteretep Posted February 24, 2015 Share Posted February 24, 2015 yeah but changing springs/spring rates you can remove the preload Quote Link to comment Share on other sites More sharing options...
Rookie Posted February 24, 2015 Share Posted February 24, 2015 I thought the rate was correct? in which case then he needs to put longer shocks and springs in to get it to the right height. Quote Link to comment Share on other sites More sharing options...
Testament Posted February 24, 2015 Share Posted February 24, 2015 I would think its more that the preload might be uneven side to side if the platforms have been moved to raise and make the car level. of if they are at the same preload maybe the car is on the piss/fruitloop etc. different heights side to side. knowing it has been/is a rally car make me consider that squareness/bentness could be a contributor. the wheels can have the right camber and toe etc. but one might be slightly further forward on the chassis or whatever which when combined with weight transfer and bumpsteer effects etc. etc. death wobble/jeep spec handling or it could just be one shitty bushing. 1 Quote Link to comment Share on other sites More sharing options...
sentra Posted February 24, 2015 Author Share Posted February 24, 2015 as above there was some terribleness with the rear bushings/whoever put them in made a meal of it. ill balance the preload tonight and get prepared to go down to meremere tomorrow, have some other issues to attend to also so not #1 priority to spend max time experimenting just yet, but will keep you all updated. 3 Quote Link to comment Share on other sites More sharing options...
V8Pete Posted February 24, 2015 Share Posted February 24, 2015 I just want to see you run millions of string lines and plumb bobs. 3 Quote Link to comment Share on other sites More sharing options...
cletus Posted February 24, 2015 Share Posted February 24, 2015 They are preloaded because the car is too low, so cutting them isn't going to help. Also I highly doubt preload is an issue, heaps of formula cars crank the shit out of the preload to create zero droop suspension, and I'm pretty sure if it had a negative affect then they wouldn't do it. cars with aero are a different kettle of fish though a road car with no droop or huge spring rates because of excessive preload can be nearly as bad as something with no springs Quote Link to comment Share on other sites More sharing options...
sentra Posted February 24, 2015 Author Share Posted February 24, 2015 it has less preload than oem fyi Quote Link to comment Share on other sites More sharing options...
Rhyscar Posted February 24, 2015 Share Posted February 24, 2015 There's nothing wrong with preloaded if you have a shock with adjustable bump and rebound so you can control it properly. Quote Link to comment Share on other sites More sharing options...
Rookie Posted February 24, 2015 Share Posted February 24, 2015 I agree Rhys, but even if you don't it isn't really a problem, and I am reasonably certain preload isn't the issue in this case. Clint, not all formula cars have aero, and the cars I was referring to were actually formula fords, and they probably get away with a lot less preload than a normal car due to the fact they weight 350kg. Also preload doesn't change the spring rate all it changes is the ride height. Quote Link to comment Share on other sites More sharing options...
cletus Posted February 25, 2015 Share Posted February 25, 2015 well there you go i learned something today it doesnt change the actual spring rate, you are correct has a similar effect though. i have set up many sets of coil overs where the spring had a lot of preload and a stiff spring, and the car rides and handles badly, has zero droop etc. loosen the springs so you can turn them and set the height with the strut length, doesnt try to kill you going round a corner any more 2 Quote Link to comment Share on other sites More sharing options...
sentra Posted February 25, 2015 Author Share Posted February 25, 2015 so, no news update today on this issue, couldnt get any gears due to selector system deciding it had had enough abuse on run #1 theirfore couldnt get any real speed to see if the issue persisted. and then... for some reason even though ive been real good lately, god decided to blow a inlet side gasket somewhere, so back on the trailer it went. to top off an adventire, in excitement i forgot to even set the preload to be even in the end anyway! weds night testntune was very sweet, def going back. however- now only have road trials before nats- and i got a frigging 100kph-with-a-trailer ticket on the way home. luck is at an all-time low. 2 Quote Link to comment Share on other sites More sharing options...
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