JMortensen Posted April 27, 2009 Share Posted April 27, 2009 remember that cutting coils increases spring rate (effectively) We had a guy go through the calculations and spring rate from cutting off a couple coils was changed by something like 5%. The stock springs are so soft, that 5% increase is really not enough. You can find spring rate calculations on line if you want to double check my memory on the rate change. Quote Link to comment Share on other sites More sharing options...
280zx 2by2 Posted April 27, 2009 Share Posted April 27, 2009 lol, or you can do what the PO of this Prelude did and heat all the springs to weaken them... 1:39 may be the most hilarious things i have seen Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 28, 2009 Share Posted April 28, 2009 Yeah, that's the way a lot of rednecks lower their Chevy trucks too. Heat the spring until it gives. Very stupid. I wonder if anyone has bothered to tell the guys in the video that they have their springs on upside down... Quote Link to comment Share on other sites More sharing options...
ZR8ED Posted April 28, 2009 Share Posted April 28, 2009 Ok That's how NOT to heat your coils! He should just man up and accept being part of the "bolt on" generation before he kills himself. Quote Link to comment Share on other sites More sharing options...
The love of JDM Posted April 28, 2009 Share Posted April 28, 2009 So does anyone have pictures of their cars after cutting coils?? Quote Link to comment Share on other sites More sharing options...
DeleriousZ Posted April 28, 2009 Share Posted April 28, 2009 We had a guy go through the calculations and spring rate from cutting off a couple coils was changed by something like 5%. The stock springs are so soft, that 5% increase is really not enough. You can find spring rate calculations on line if you want to double check my memory on the rate change. i'll take your word for it Quote Link to comment Share on other sites More sharing options...
OniZ Posted January 17, 2010 Share Posted January 17, 2010 (edited) I just cut my front coils on my 71 haven't done the back but ran into other issues that needed to be taken care of. So I will have pics and numbers posted for the rear once I've done them. So here are the measurements I had and ended up with I will take pics tomorrow and post them. Front ride height when started was 26 1/4" (from center of tire on the ground to the highest point of the fender lip-just about center). After the height was 25 3/8". I did the half a coil cutting and it just wasn't enough so I opted for a full coil to get the desired drop. In total I cut 2 1/2 coils each full coil was about a .85 drop in height. I like the result for the most part however the car seems to max out on severe bumps but I'm not sure yet as I haven't hit many since the drop I will let everyone know once I've driven the car for a while. Edited January 17, 2010 by OniZ misspellings Quote Link to comment Share on other sites More sharing options...
OniZ Posted January 17, 2010 Share Posted January 17, 2010 Here are the pics of the change in suspension height, the left ones are old the right ones are new. I also wanted to mention that the .85" is roughly over 3/4". Quote Link to comment Share on other sites More sharing options...
Two80z4me Posted January 24, 2010 Share Posted January 24, 2010 very nice OniZ, I have a set of Tokico Blue Coils for my 280z that I cut and its gonna lower my car about 2-2.5" depending on stock suspension sag over the 32 years its been around. I believe that 1-1/2coils were cut off each spring, so does anyone know what that would bring the spring rate to? I believe the Tokico Blue springs were front 220 and 240 rear? So when 1-1/2 coils were cut off it would be something like, Front 255 and 276 Rear? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted January 24, 2010 Share Posted January 24, 2010 http://www.ajdesigner.com/phpspringrate/spring_rate_equation.php Here's the math if you want to figure it out yourself. I would guess that the rate changed less than 10 lbs. Quote Link to comment Share on other sites More sharing options...
Two80z4me Posted January 24, 2010 Share Posted January 24, 2010 http://www.ajdesigner.com/phpspringrate/spring_rate_equation.php Here's the math if you want to figure it out yourself. I would guess that the rate changed less than 10 lbs. well, Someone else figured that 5% per 1/2 coil, and I took 1 and a 1/2coil wouldn't it increase into 15% or is my theory just up in smoke. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted January 24, 2010 Share Posted January 24, 2010 well, Someone else figured that 5% per 1/2 coil, and I took 1 and a 1/2coil wouldn't it increase into 15% or is my theory just up in smoke. Don't use my fuzzy recollection from 7 or 8 years ago and then extrapolate on that. As the old saying goes, if you make ♥♥♥♥ with ice cream you get shitty tasting ice cream. Quote Link to comment Share on other sites More sharing options...
Two80z4me Posted January 24, 2010 Share Posted January 24, 2010 Don't use my fuzzy recollection from 7 or 8 years ago and then extrapolate on that. As the old saying goes, if you make ♥♥♥♥ with ice cream you get shitty tasting ice cream. hahaha wise words Quote Link to comment Share on other sites More sharing options...
johnc Posted January 25, 2010 Share Posted January 25, 2010 I believe the Tokico Blue springs were front 220 and 240 rear? Nope. Same as current. Quote Link to comment Share on other sites More sharing options...
Two80z4me Posted January 26, 2010 Share Posted January 26, 2010 Nope. Same as current. 185 Front and 200 Rear? those are sadly low rates. Quote Link to comment Share on other sites More sharing options...
OniZ Posted February 7, 2010 Share Posted February 7, 2010 ok just cut my rear spring today starting height was 26" even now the rear is 24 1/4". Once again I cut full coils not half in total for the rear I cut 2 full coils. I will post pics later today if not tomorrow. Quote Link to comment Share on other sites More sharing options...
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