deja Posted January 28, 2010 Share Posted January 28, 2010 I have given up seaching the internet for this. I am gathering parts to do a 5 lug conversion. Right now I have Silvermine brakes on the front and MM on the rear. Both of these use '84 300zx rotors. But I am going to have to switch to 5 lug rotors and am a bit confused about the diameter of the 5 lug vs. 4 lug rotor. From what I understand the 84 300zx NA use 4 lug and the Turbos use 5 lug. Does anyone know if they are the same diameter. I know I could attempt to drill the rotors to fit the 5 lug but I'd rather not do that. Quote Link to comment Share on other sites More sharing options...
zcarnut Posted January 28, 2010 Share Posted January 28, 2010 ...From what I understand the 84 300zx NA use 4 lug and the Turbos use 5 lug. Does anyone know if they are the same diameter... For either the Turbo (5-lug) or the non-turbo (4-lug), on the 1984 Z31 the rotor diameters are the same (front or rear). Quote Link to comment Share on other sites More sharing options...
deja Posted January 28, 2010 Author Share Posted January 28, 2010 Thanks, I was hoping that was true. For either the Turbo (5-lug) or the non-turbo (4-lug), on the 1984 Z31 the rotor diameters are the same (front or rear). Quote Link to comment Share on other sites More sharing options...
deja Posted January 28, 2010 Author Share Posted January 28, 2010 I just thought of another issue. My front rotors are vented but the rears are not. Are the 84 300zx 5 lug rear rotors vented? For either the Turbo (5-lug) or the non-turbo (4-lug), on the 1984 Z31 the rotor diameters are the same (front or rear). Quote Link to comment Share on other sites More sharing options...
deja Posted January 29, 2010 Author Share Posted January 29, 2010 Never mind, I found the answer, the fronts are vented the rears are not. I just thought of another issue. My front rotors are vented but the rears are not. Are the 84 300zx 5 lug rear rotors vented? Quote Link to comment Share on other sites More sharing options...
Silver Mine Motors Posted January 29, 2010 Share Posted January 29, 2010 Deja if you need your rear rotors redrilled to a 5 lug i can do that for you. there is no problem with doing that as far as saftey concerns. as far as the front goes. i would just buy one z31 5 lug rotor from a local store and test fit it to see if the offset is the same and the thickness is the same. post your results so we can all know. Quote Link to comment Share on other sites More sharing options...
Gregmatic Posted January 29, 2010 Share Posted January 29, 2010 z31's didn't get vented rotors on the rear until 87+. Front diameter is the same for either 4 or 5 lug (as stated previously), offset is same as well. Basically if you stay in the realm of 84-86 most everything is the same regardless of 4/5 lug turbo or non. 87+ starts to see some differences from the 84-86 and there are also differences between turbo and non. Quote Link to comment Share on other sites More sharing options...
deja Posted January 29, 2010 Author Share Posted January 29, 2010 Thanks. But by the time I sent them both ways to California I could almost buy new ones. LOL. As you now I have you front brake setup so I pretty much know what I need, just wasn't sure the 5 lug and 4 lug were the same size. I ordered new ones last night from the same place I got my rears last year. When I finally get all this installed I will sell the rotors I have now, they only have around 3000 miles on them. Deja if you need your rear rotors redrilled to a 5 lug i can do that for you. there is no problem with doing that as far as saftey concerns. as far as the front goes. i would just buy one z31 5 lug rotor from a local store and test fit it to see if the offset is the same and the thickness is the same. post your results so we can all know. Quote Link to comment Share on other sites More sharing options...
deja Posted January 29, 2010 Author Share Posted January 29, 2010 Its all so confusing, LOL. But I am confident I have the right stuff ordered. You post confirms what the vender said last night. z31's didn't get vented rotors on the rear until 87+. Front diameter is the same for either 4 or 5 lug (as stated previously), offset is same as well. Basically if you stay in the realm of 84-86 most everything is the same regardless of 4/5 lug turbo or non. 87+ starts to see some differences from the 84-86 and there are also differences between turbo and non. Quote Link to comment Share on other sites More sharing options...
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