dizzle Posted July 20, 2010 Share Posted July 20, 2010 I have been working on getting my pinion angle right for 6 months in my 73 S30 w/ an rb25det. I am looking for the angles that are on the factory engine set up in an s30. I need the downward angle of the engine, the driveshaft angle, and the upward angle of the the differential. I am finishing my R/T mount tomorrow and really want to get the drivetrain solid in this thing, Finally!!!! Thanks Quote Link to comment Share on other sites More sharing options...
Zinpieces Posted July 20, 2010 Share Posted July 20, 2010 Two words....Magnetic Protractor Quote Link to comment Share on other sites More sharing options...
dizzle Posted July 20, 2010 Author Share Posted July 20, 2010 I have a magnetic digital angle finder and right now I am at; Trans down in rear= 3 deg driveshaft down in rear= 2.2 deg diff up in front= 3.7 deg I have done plenty of searching, my op angles are .7 and 1.5. According to what I have read on a 20" driveshaft my operating angles need to be 4 deg or less and within 1 deg of one another. I am still having vibration problems. Vibration comes on at about 50 mph and then fades at 70-75 mph. This is why I am wondering what the angles of the engine, trans, and diff for a stock Z. Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
johnc Posted July 20, 2010 Share Posted July 20, 2010 I have a magnetic digital angle finder and right now I am at; Trans down in rear= 3 deg driveshaft down in rear= 2.2 deg diff up in front= 3.7 deg I have done plenty of searching, my op angles are .7 and 1.5. According to what I have read on a 20" driveshaft my operating angles need to be 4 deg or less and within 1 deg of one another. I am still having vibration problems. Vibration comes on at about 50 mph and then fades at 70-75 mph. This is why I am wondering what the angles of the engine, trans, and diff for a stock Z. Any help would be appreciated. Lower the front of the diff until its 3 deg up. Also, make sure the diff and trans are parallel in the horizontal plane. Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 26, 2013 Share Posted September 26, 2013 Well I'm not going to start a new thread since this issue has been discussed many times already. What I was looking for was stock pinion angles of operation for the s-30. I'm looking for exact numbers from your stock machine which includes down angle of trans, angle of DS, angle of pinion. My case of vibration is at 75mph approx. I WAS running the RT mount with GM insulator, but I have gone back to stock diff mount and using thr Rt to sandwich things-so-i should be in stock location at that end. The other end is my BWT-5 which has a mount bracket modified to fit my s-30. I think my trans is hanging to low, but would like to hear what operating angle is on a stock Nissan trans in the right chassis to compare with mine. I have been reading site after site on pinion angles and realized that my earlier calculations were not right. I am revisiting this issue, but knowing what Nissan did with the short DS operating angles would help clue me in. Obviously by all the threads I have been reviewing there has been numerous issues with getting this right---probably because of our very short shaft. Quote Link to comment Share on other sites More sharing options...
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