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rabrooks

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rabrooks last won the day on January 3

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  1. At this point, this is all hypothetical. My plan is to keep the SIA as close to factory by moving the top of the strut out on the camber plate the same amount as I stretch the LCA. The LCA may get a little longer than what I can move out the top of the strut but not by much. I would set the negative camber after that setup is in place. and adjust whichever end makes the most sense given all the new geometry. So try to imagine taking the factory geometry and moving it outboard while leaving the wide tires where they sit. I just get a wheel with a different offset, something more in the positive offset range. I haven't laid this out to see how wide a tire I can get mounted with this setup before the inner tire wall hits the strut. I could move the tire back out again with a different offset wheel to get the tire off the strut. If none of this lays out correctly, I'll just have to deal with the scrub. On the double ball joint setup, I ran across a BMW in the pick and pull with the complete front suspension. I may go back and pull it. I may be able to work out that setup or some version of it. I have a 335i. I've been looking at it trying to decide if I should do this. I'm willing to invest in the pick and pull parts for the sake of trying to figure it out. Just by coincidence, I have a complete set of lower control arms for my 335. I recently bought them to replace the old ones.
  2. In essence, it sounds like there is no way to deal with a large scrub radius if you run a wide wheel and tire because it will have to run a high negative offset, driving the large scrub. I hoped to find a way to get a smaller scrub with the wide wheels. The only way I can envision this happening is doing what I mentioned earlier, running a longer LCA and then reducing the negative offset of the wheel. This will lower the scrub and leave the track as wide as it was with the high negative offset wheels. That was why I suggested pushing the top of the strut outward (because the lower ball joint moved out with the LCA). But I would set the camber to what it needed to be, not just shoving the top of the strut over until it hit the end of the camber plate.
  3. JMortensen, can you provide any insight on my question about scrub radius in my previous post. I saw one of your posts recently discussing the SLA setup. You mentioned scrub radius in the post. There was a drawing of what looked like a plate that was designed to accommodate the SLA setup.
  4. Ok, back to the suspension. After taking a long hard look at this project. I have changed my direction abit. And this new direction raises more questions. I hope all that made comments earlier will come back with your thoughts. I have decided to take the advice of others and try to tune the factory setup. I have made this decision due to cost and time to fruition. However, I too am interested in the SLA setup for a few different reasons. First question to sorting the factory suspension. Scrub Radius, How do I deal with the large scrub radius when running wider wheels and tires on the stock setup. I would like to run as wide a tire as is reasonable. So if I go wider, I'll have to get a different offset wheel. This offset will most likely upset the scrub radius, and create other scrubbing problems while turning. It seems I may be able to overcome some of this by using a longer LCA and using camber plates with the strut pushed as far out as possible (adjusting the LCA to get optimum - camber) improving the scrub radius. Then I can use a wheel with less negative offset and still have the tire in about the same location reducing scrub radius. Has anyone used this approach. Looking at the video of the SLA, it looks like it can help with the negative affect of the wider tires along with other positive affects. Thanks Roger
  5. All the talk of ride harshness makes me wonder how many of these cars mentioned in these posts are lowered, changing the optimum suspension geometry to something less forgiving. That too will add to the harshness of the ride. That being said, there is a great deal to consider and design in when making suspension changes.
  6. So based on the spread sheet you supplied wouldn't it be best to run the toyota vented up front and the toyota solid on the rears. If I understand this correctly, that would give a 55/44 brake bias. So I wonder how hard it would be to mate the toyota solid fronts to the rear of a 280z? My numbers may be skewed because I was focusing on the front line PSI. Not sure what the rear would be or if the volume from the master affects the overall numbers Thanks
  7. Is this for the larger diameter 280 tubes or the 240 Thanks
  8. Thanks to everyone for supplying all this information. I will certainly be able to make better decisions going forward. The info below is what another Z enthusiast is using since the discontinuance of the bilstiens F4-P36-3022 Rear- 1992-1995 BMW 530i/540i (front HD inserts) F4-P36-0262-H0 Front- 1984-1989 Nissan 300ZX Turbo HD Inserts
  9. I agree with all the above. Definitely using coil over style struts with camber plates. Failed to mention that earlier. My battery will stay in the factory location. Going to the ls1 and t56 changes the ratios to a level that requires more thought on my part to get back closer to the 50/50 ratio. That's why I'm moving the fuel cell forward of the original tank and not moving the battery to the rear. I may go with a fiberglass rear hatch and plexi window. I do have another option to move some weight back forward. I can go with a built T5 transmission. In a road racing arrangement I think it will hold up. No hot launches and rev matching downshifts.
  10. Thank you for this information. Based on the spring info is it safe to say your springs compress 2-2.25" I will shoot for 50/50 but changing so many things, what I posted is my best guess. I'll probably keep the battery in factory location. Hope to switch fuel cell moved forward by 6 inches of factory tank. If left right mix and cross weight ratio is out of wack I'll move the fuel cell over or place it in the floor of the passenger side. This is probably the best fix but it takes away a few options I'd like to have. Like passenger seat.
  11. I believe my car will weigh in at 2450 or less. I'm trying for 2300. So if I hit my target of 2450, with a 52% rear and 48% front wight bias. What would you guys recommend for the spring rates and spring heights Thanks
  12. So it sounds like if I go as I plan, converting to coil overs the car will sit down 1.5" in the front and 2.5 in the rear. If that's the case, then I just need to concern myself with making an adjustment so the lca's are at original geometry. Which means the spacers up front and the pin tube dropped for the rears. Am I understanding your information correctly.
  13. On the 528 BMW insert working on the 280z's, I got that info from a person that has been running rally races for 15 years in his 280. He is sending me info on all the suspension parts he buys to make his system work, front and rear. When I get that info, I will share what is pertinent. I know a good bit of his parts will need to be changed for stiffer springs and or different valving due to him running on dirt and me on asphalt with sticky tires.
  14. Thanks for the insight. I do pkan on running bilstiens. Ihave heard the frobts can use bilstiens for a 52i bmw without mods. I have the wrld on threaded spring perches also. I will look into the bump steer springs I agree that factory setup isnt ideal. I dont like sruts. I was planning to develop double a arm setup. But the cost will nurt the project. So the best setup of the suspension as it is, is to keep the lower control arms close to he factory angle. I dont want a lowered car with the lower arms high outboard. So thats why i was thinking spacers up front and a new lower tube in the rear Thanks for all the info. Its great to process it and to hear others have done tbis
  15. Help me beat this dead horse. I'm building a 280z track car. I want to get decent suspension without spending a fortune. I don't care for strut suspension, but I think I have to stay with it in order to curtail the spending. I know alot of people lower these cars with coil overs. but it seems to me if you set the geometry of the suspension different than intended it makes things more harsh and it doesn't work as well as if it were in its original geometry. I'm sure what I have decided to do has been thought of long before now. I want to run it by the gallery to get some feedback. For the front,I thought I would cut the strut tube down 1.5". then add a bump steer spacer between the lower control arm and spindle. That should get the car lower while maintaining the best geometry. Its as if I put 1.5" lowering spindles on it. The rear will be similar but I will have to weld a new pin tube to the bottom of the hub to raise that spindle (lower the rear of the car) I'll likely run bilstein double adjustable shocks and not sure on springs. I guess Eibachs. What are your suggestions for springs I want to run 16" wheels and tires, comment on the size tire that fits the wells the best. It will be wide body but I'm looking for diameter. I have an LS1 with t56 for the car. Thanks for your help Roger
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