kaito Posted April 17, 2012 Share Posted April 17, 2012 So I put my ground control kit on the front of my 260z with 12 inch springs and with the perch all the way lowered it barely dropped my car an inch. This is with 30mm sectioned from the casings. I figured that I could just go from 12 inch springs to 8 inch springs and get it the height I wanted with the lower spring support/perch in the middle of the threaded sleeve. Now with them in the middle of the threaded sleeve the car is lowwwww but I have only an inch of strut travel till it bottoms out... without bumpstops!! I used the instructions from the techno toy tuning guys recommending 30mm to be removed front and back, with the bottom perch welded on 7 and 1/8 inches from the top of the strut. Im using illumina bz 3125s in the front and bz 3038s in the rear. Did I do something wrong or do I just have the car too low? This is with 14 inch rims and no camber plates. Im seriously thinking of adding camber plates to the front to get the thickness of the top isolator removed. That should get me another inch at least.I shouldnt have this problem in the back because I have 2 more inches of tube I can section out plus the rears I can use camber plates and remove another 2 inches. I saw a post very recently talking about strut travel and now I cant find it. I was searching for spring height posts when I came across it but I wasnt paying attention and now I cant find it. Let me know what you all think. Quote Link to comment Share on other sites More sharing options...
johnc Posted April 17, 2012 Share Posted April 17, 2012 The link is here: http://forums.hybridz.org/index.php/topic/38589-strut-sectioning-faq/ I don't' know where TTT is getting their numbers from. Quote Link to comment Share on other sites More sharing options...
kaito Posted April 17, 2012 Author Share Posted April 17, 2012 No sir, I have read that one. The thread Im talking about mentions 8 inch springs, and something about the amount of desired travel with 1.5 inch bumpstops. Its fuzzy though. I was half sleeping when I read it. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted April 18, 2012 Share Posted April 18, 2012 Is it possible to split the difference and get some 10 inch springs? Split the middle of too high and too low? Quote Link to comment Share on other sites More sharing options...
kaito Posted April 18, 2012 Author Share Posted April 18, 2012 So in my quest to find out if I did anything wrong I did some research to compare my strut part numbers (bz3125, and bz3038)with the most commonly used part numbers (bz3099 and bz3015). I was trying to find out what the actual body height differences of each of these struts was and I actually called the toll free hotline on the tokico website. The gentleman told me their tech was gone for the day but took my part numbers down and said they would call me back tommorow. They kept their promise and at 7:30 the next morning the tech gave me the info I asked for. He was very enthusiastic and gave me much more info than I originally asked for. The reason I went through the trouble of finding this out was because I was worried the struts recommended to me by TTT were taller than the ones more commonly used. It now looks like I may just have the car too low and I plan on sectioning my strut so that I dont have spacers in the bottom which should yield me another 1/2 inch or so. Then Ill get the rest of the distance I want by using camber plates in the front. I dont forsee this problem happening on the rear though so I should be good to go. Anyways on to the important info, the strut specs! BZ3099 = 13.375" body length, 1.7" diameter, 20.625" extended length. BZ 3015 AND BZ3038 = 14.875" body length, 1.69" diameter, 21.938 extended length. BZ3125 = 13.063" body length, 1.7" diameter, 20.0" extended length. By the way, the part numbers which I used came as a recommendation from the guys at TTT. Im not saying these part numbers are good or bad, just giving the info on where I sourced my instructions from. Enjoy this info, you wont find it on any other posts except this one. Quote Link to comment Share on other sites More sharing options...
johnc Posted April 18, 2012 Share Posted April 18, 2012 All those inserts will work, although I'm not sure about the rebound valving on the 3125 and the 3038. Both are pretty similar tot he 3099 so its probably not an issue. The 3125 has a shorter stroke then the other so be careful not to shorten the struts too much. The the 30mm sectioning TTT recommended seemed a little short (not enough cut out) to me. Quote Link to comment Share on other sites More sharing options...
kaito Posted April 19, 2012 Author Share Posted April 19, 2012 All those inserts will work, although I'm not sure about the rebound valving on the 3125 and the 3038. Both are pretty similar tot he 3099 so its probably not an issue. The 3125 has a shorter stroke then the other so be careful not to shorten the struts too much. The the 30mm sectioning TTT recommended seemed a little short (not enough cut out) to me. 30mm Isn't so small, Its 1.181 inches which is just a 16th of an inch under a quarter of an inch. Most everyone sections betweeen 1 and 2 inches, usually around 1 and 1/2 inches if Im not mistaken. I only have maybe a half of an inch worth of spacer under my front strut tubes till the cartridge wont fit anymore. How much do you usually section struts and what cartridges do you usually use if you dont mind me asking. Im just starting to realize that spring rates, strut cartridge type, spring perch position and other like variables can make a guy feel overwhelmed when trying to do something that is importnat like holding a car up at high speeds. Sorry if im coming off as rude, Im just trying to learn more. There is so much about cars that people dont even give much thought to especially a car as simple as the early z cars. Quote Link to comment Share on other sites More sharing options...
johnc Posted April 19, 2012 Share Posted April 19, 2012 30mm is a small cut when shortening S30 struts. Please read the link I posted above. You typically shorten the front strut tube so that there is no spacer under the shock and then take the exact same amount out of the rear strut tube and cut a spacer the correct length to put the top of the shock body even with the top of the shortened strut tube. I typically shorten the struts around 1.750" - depending on the shock used. Quote Link to comment Share on other sites More sharing options...
kaito Posted April 19, 2012 Author Share Posted April 19, 2012 Ok sir, I must have missed it in the aforementioned thread. Thanks! Quote Link to comment Share on other sites More sharing options...
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