bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 Can i ask apart from the 20" which will have an effect on the overall feel of the car as to achieve the correct rolling radius the tyres are going to be very low profile IE 30-35, do you have the car lowered, and have you got adjustable camber control arms and rods fitted? Who did the alignment setup? OK they are 30s the wheels and spacers where fitted by the previous owner, the aalignment was done by Nissan ( have a receipt ) and subsequently checked by my independant when I bought the car, in the history that came with the car there is no mention of adjustable control arms etc Fyi the rolling radius is pretty much spot on as the speedo is within the excepted misread ie is reading 3mph higher than actual as verified on a rolling road using dot approved equipment. Thanks for your input. Quote Link to comment Share on other sites More sharing options...
AliveBoy Posted August 7, 2014 Share Posted August 7, 2014 Maybe we need to organise a Z club day there, so you can do some back to back tests with multiple vehicles Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 Maybe we need to organise a Z club day there, so you can do some back to back tests with multiple vehicles I should of known that was coming...unfortunately my mate did it as a favour and subsequently was reprimanded for it...thats going to cost me a lot of beer & takeaways to put right Quote Link to comment Share on other sites More sharing options...
brillomaster Posted August 7, 2014 Share Posted August 7, 2014 this might be a silly question, but do you frequently test cars up to 130+mph that might give you something to compare to? ie have you had fast cars in the past? personally I wouldn't know what a car is supposed to feel like at 130, as I've never driven that fast. 1 Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 (edited) The car is standard apart from 20" Finichi Firenze wheels, so im assuming you've end up increased the gap between the road and your underside with these wheels, which would yes cause lift and cause unstable compared with stock ground clearance Edited August 7, 2014 by StevoD Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 (edited) this might be a silly question, but do you frequently test cars up to 130+mph that might give you something to compare to? ie have you had fast cars in the past? personally I wouldn't know what a car is supposed to feel like at 130, as I've never driven that fast. Indeed...I used to roadtest performance cars pre- delivery back in the day and I have driven many a high powered vehicle on roads where legal at speeds well in excess of our paltry nsl Edited August 7, 2014 by bytespc Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 The car is standard apart from 20" Finichi Firenze wheels, so im assuming you've end up increased the gap between the road and your underside with these wheels, which would yes cause lift and cause unstable compared with stock ground clearance That's an assumption though as the rolling circumference is altered through the use of rubber band tyres etc you'd think not. As an aside 350Z ownership is not cheap so with my P3 all fluids and belts and plugs booked for next Wednesday this will have to wait. Though it eould be nice to get to the bottom of it. Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 Well your the guy to tell us what tires you've got if there not stock rolling radius and it is lifting the body I would start there, 50mm of tyres squeezes more than 10 like the rubber band tyres so I would still say ground clearance has been raised Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted August 7, 2014 Share Posted August 7, 2014 (edited) You didn't answer my question about if the car has been lowered IE springs/dampers/coil overs, have you got a pic so we can see the arch clearance? My previous point was that if its been lowered it will increase camber to a point that cannot be compensated for by the std adjustment points, so any alignment done will just end up as near as which can lead to high speed instability. Also adding larger wheels and spacers will compound this effect. Edited August 7, 2014 by Tricky-Ricky Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 You didn't answer my question about if the car has been lowered IE springs/dampers/coil overs, have you got a pic so we can see the arch clearance?My previous point was that if its been lowered it will increase camber to a point that cannot be compensated for by the std adjustment points, so any alignment done will just end up as near as which can lead to high speed instability. Also adding larger wheels and spacers will compound this effect. No not lowered, the rolling circumference though is less 2057.7mm against 2129.1mm for the standard rays Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 stock rays are on the front 2072.5mm Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 every picture i can find of a Zed on 20" with stock suspension look alot higher than stock, what are your front and rear tyre sizes Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 stock rays are on the front 2072.5mm Different websites different figures if you go to www.wheelsizecalculator.com and put in 350Z front it says my fronts should be 245 35 20 not the 30s I have Quote Link to comment Share on other sites More sharing options...
pjf1985 Posted August 7, 2014 Share Posted August 7, 2014 I'm getting lift too Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 For you StevoD Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 fair the only comment i can give to this is i ran 245/35/19 on the front o my 350z with it slammed didnt hit the ground once changed to 245/40/18 front which is a 2mm difference i had to raise my front end up about 1.5 inches to stop it hitting the road, big profile tyres compress more lowing the ride height, more alloy than tyre over stock doesn't compress as much Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 For you StevoD looks higher than stock to me Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 For you StevoD looks higher than stock to me but didn't all those others too ?, if it is it means the previous owner has uprated shocks and springs all round .....but the ground clearance looks right and next to all those Zds at Beaulieu it didnt look higher at all..... Oh bugger it.....would explain it though we need a clearance off...get out and measure your graound clearance ..sill to road and we'll compare Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 7, 2014 Share Posted August 7, 2014 I'm about 2inches from the ground but I'm on coilovers I would put money you do the run again with a set of rays with mpss fitted it will feel planted Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 I'm about 2inches from the ground but I'm on coilovers I would put money you do the run again with a set of rays with mpss fitted it will feel planted Thanks for that..... Alas thats not gonna happen and hey I love my wheels..but take your point Quote Link to comment Share on other sites More sharing options...
bytespc Posted August 7, 2014 Author Share Posted August 7, 2014 Off topic .why can I only use quote function on my Android ? Quote Link to comment Share on other sites More sharing options...
KyleR Posted August 8, 2014 Share Posted August 8, 2014 (edited) stock rays are on the front 2072.5mm Different websites different figures if you go to www.wheelsizecalculator.com and put in 350Z front it says my fronts should be 245 35 20 not the 30s I have No, the 30's you have are the right size, 35's will give you a tyre that has a diameter of almost 2 cm larger. I think he car LOOKS higher, but thats just because of the larger wheels, I'm pretty sure it's within a mm or 2 of stock height. fair the only comment i can give to this is i ran 245/35/19 on the front o my 350z with it slammed didnt hit the ground once changed to 245/40/18 front which is a 2mm difference i had to raise my front end up about 1.5 inches to stop it hitting the road, big profile tyres compress more lowing the ride height, more alloy than tyre over stock doesn't compress as much 245/35/19 is stock size for 19's, your 245/40/18's are smaller than stock, so it makes sense that the car would ground out more often. Edited August 8, 2014 by KyleR 1 Quote Link to comment Share on other sites More sharing options...
StevoD Posted August 8, 2014 Share Posted August 8, 2014 The diffrence in diameter from 245/40/18 to 245/35/19 is about 2-3mm ? Doesnt explain why a 1.5 inch raise was needed Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted August 8, 2014 Share Posted August 8, 2014 To me some things need investigating further to find a solution, fist off your going by the spec provided by the previous owner, so it needs jacking up to see whether it has any after market suspension parts fitted or not, Your also going by the alignment being done previously by Nissan, and was this done before or after the wheels and spacers where fitted? To me there seem to be too many unknowns to be sure its not an issue that been previously created,it could have had previous damage to the suspension, i would check all the above and then get the alignment done by a performance orientated suspension specialist. Quote Link to comment Share on other sites More sharing options...
KyleR Posted August 8, 2014 Share Posted August 8, 2014 The diffrence in diameter from 245/40/18 to 245/35/19 is about 2-3mm ? Doesnt explain why a 1.5 inch raise was needed Few too many bigmacs that weekend? 1 Quote Link to comment Share on other sites More sharing options...
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