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Post by cul8r on May 7, 2007 11:38:36 GMT 12
Good nuts Jaygti, can wait to see pics of them on
Cheers,Chris
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Post by mikuni on May 7, 2007 16:05:40 GMT 12
Cool man. I was considering buying them again also. I'm pretty sure these are the same ones that have been for sale since before I widened my wheels. The pics and name on trademe look awefully familier. I too can't wait to see them on the hatch. Make sure you get nice little tyres and sit the car at a good height  |
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Post by jaygti on May 7, 2007 16:45:59 GMT 12
well I figured it was best I buy them, they'll save me from a bashing from sexychevette (it was these or widened Rostyles)... ;D.
Raises a couple of questions though. I am indeed going for nice little tyres, 175-50-13s or there-abouts, but how much is that going to affect the gearing? It's happy enough at 100 at the moment, is it going to be a little short-geared now?
Also, on the lowering front, where can I get proper springs (i.e. not cut) and decent shocks (shortened or otherwise)? I was going to get the shortened Spax ones from the UK, but TJ Motorsport are closed until the end of August and I can't wait that long...
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Post by geminimad on May 7, 2007 17:48:53 GMT 12
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Post by mikuni on May 8, 2007 7:42:33 GMT 12
Raises a couple of questions though. I am indeed going for nice little tyres, 175-50-13s or there-abouts, but how much is that going to affect the gearing? It's happy enough at 100 at the moment, is it going to be a little short-geared now? Also, on the lowering front, where can I get proper springs (i.e. not cut) and decent shocks (shortened or otherwise)? I was going to get the shortened Spax ones from the UK, but TJ Motorsport are closed until the end of August and I can't wait that long... Talk to sexychevette about those 175/50/13 directionals for $115 each. Sounds like the go. He won't be back for another month though, so perhaps sexyminor off oldschool might be your best bet. The gearing will be fuked yes. We did a speed trial with my car against another at 110km/h and mine was indicating around 135-140km/h at that speed. I was surprised with it though, in that it seemed to not mind sitting at a higher speed/engine rpm with the smaller wheels. I think most places will have lowering springs for gemini's, which will fit and actually seem to lower the car a decent amount. I can't imagine anyone will have anything specifically for the chevette though and no matter what you find I think you will have trouble with the rate. They always seem to be faar too soft. I prefer cutting them the proper way so you know you have a decent hard ride and the right ride height. |
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Post by jaygti on May 8, 2007 8:58:24 GMT 12
Cheers for the helpful post Mikuni, I'll have to buy you a beer or several if I get to meet you...  Mind you, the seller still hasn't contacted me, so not sure what's happening there. |
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Post by cul8r on May 8, 2007 9:27:10 GMT 12
Piazza Springs!
They are stiffer, thats what we've got, fit in the rear (not sure about front, couldnt be assed changing them), alot stiffer, and theres more coils so you can cut them (to lower it) if you want..
Cheers,Chris
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Post by cul8r on May 8, 2007 10:09:25 GMT 12
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Post by mikuni on May 8, 2007 13:15:33 GMT 12
Piazza Springs! They are stiffer, thats what we've got, fit in the rear (not sure about front, couldnt be assed changing them), alot stiffer, and theres more coils so you can cut them (to lower it) if you want.. Cheers,Chris Are you sure? I just assumed Piazza springs would be stiffer due to the larger body weight of the car so I got some and stuck them in and wasn't too impressed. After doing abit of research I actually found that Piazza guys put gemini springs in because they are stiffer? Turns out the piazzas somehow ended up with spongy crappy springs to go with their spongy crappy handling. I cant be 100% on this however. In saying this, I think I might have piazza springs in the back of my car still.. although they could be from the front of the piazza.. or maybe they are honda ones.. I dunno.. I'm getting forgetful in my old age ;D |
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Post by cul8r on May 8, 2007 15:02:22 GMT 12
Well, The guy I bought the gemini wagon off, put slightly cut down Piazza springs into it (cause it didnt come with shocks or springs..) And when I pulled one out of the gem wagon , and then one out of the chevette, the chevette was noticibly softer.. I could be wrong but Im sure he put the piazza springs in - he'd derbied two previously, but then again he could've got some off the guy with the 4age Chevette wagon.. (doubt it though)
Cheers,Chris
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Post by burntrubber on May 8, 2007 18:37:51 GMT 12
Piazza front and rear springs are noticeably thicker than Gemini springs I still have a set no Idea if they are stiffer or not though.
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Post by cul8r on May 8, 2007 19:14:54 GMT 12
Well the thicker the spring itself is multiplied by the number of complete coils works out your spring rate - apparently anyway.. I think they have a couple more coils, and Burntrubber says they are thicker, so should definitly be a stiffer spring..
Cheers,Chris
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Post by gordo on May 8, 2007 22:01:15 GMT 12
Well the thicker the spring itself is multiplied by the number of complete coils works out your spring rate - apparently anyway.. I think they have a couple more coils, and Burntrubber says they are thicker, so should definitly be a stiffer spring.. Cheers,Chris Increasing the number of coils reduces the spring rate - makes it softer - in proportion to the number of coils. Increasing the diameter of the wire makes the spring stiffer, to the fourth power of the increase in diameter - ie, going from 10mm to 12mm will make them (12x12x12x12)/(10x10x10x10) times stiffer or just over twice as stiff (actually 2.0736). Increasing the coil diameter will make it softer in proportion to the increase in diameter. This is just a simple summary and several factors may be altered at the same time. |
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Post by crazytim on May 8, 2007 23:03:02 GMT 12
whoa u like einstein man...
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Post by mikuni on May 9, 2007 8:34:24 GMT 12
haha yeah that was a good explanation. I knew that more turns made the spring softer but its good to have an explanation of the diameter of the steel also. Makes sense to me.
I remember the ozgem guys talking about sway bars. People were upgrading from standard (whatever that is, maybe 16mm?) sway bars to sway bars as large as 26mm. The explanation for this was that they wanted it twice as stiff but the struggled to understand the fact that it was increasing the rigidity of the sway bar by something like 12 times.. I thought that was awesome.
Anyway, back on topic gordo. Do you know much about spring rates and what would be soft/hard/ideal in a chevette for track use?
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