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Old 02-07-2011, 07:02 AM   #1
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Default Thinning graphite chassis affect flex? Proper ride height for asphalt ?

hi guys, i am facing a little problem regarding a thininng graphite chassis. i drive a pretty old car, and i only race occasionally. My car is the Kawada Sv-10 Alcyon 2. Originally the chassis is 2.2mm thick. The car handled really well when it was new. But lately i feel that it tends to tweak easier than before when taking a hit or overturning . My chassis can be considered pretty worn, but not totally damaged. Its worn at the front edge, rear edge and the outer battery sides. The middle parts are still thick at 2mm, but some portions of the sides are down to 1.5mm. My question is , can thinning at the sides, front and back cause the chassis to flex more hence tweak easier ? if i change to a new chassis, will i get optimum handling? i do have a brand new chassis i got cheap but i dont want to use it yet.i used to protect the chassis with my own made protective film the first few years, but gotten lazy the last 3 years and stopped doing it.
also most pros said a ride height of 5mm is good for asphalt, i am running 5 at the front and 5.5 at the rear, i am going to try 5.5 at the front and 6 in the rear to reduce the scraping.
is it better to make ride height a little higher and scrape less or leave it low and let the chassis scrape? what are you guy's ride height for asphalt ?
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Old 02-07-2011, 07:08 AM   #2
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scraping on asphalt is unfortunately unavoidable (most of it is happening on full throttle lean on sweepers)... All the optimal setups and fast cars scrape the chassis for the most part. If you set ride height so that you don't touch down at all it's probably going to be considerably slower than the optimal setup... That being said the usual scraping should be only on the far edges of the sides of the chassis and slightly diagonally across the rear... If you are scraping or touching down in the middle of the chassis or in the front then you are too low or your suspension setup is not right...
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Old 02-07-2011, 05:25 PM   #3
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scraping on asphalt is unfortunately unavoidable (most of it is happening on full throttle lean on sweepers)... All the optimal setups and fast cars scrape the chassis for the most part. If you set ride height so that you don't touch down at all it's probably going to be considerably slower than the optimal setup... That being said the usual scraping should be only on the far edges of the sides of the chassis and slightly diagonally across the rear... If you are scraping or touching down in the middle of the chassis or in the front then you are too low or your suspension setup is not right...
hi msan thanks ! but will a chassis that is scraped badly at the sides can cause the chassis to tweak more easily ?
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Old 02-07-2011, 05:25 PM   #4
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scraping on asphalt is unfortunately unavoidable (most of it is happening on full throttle lean on sweepers)... All the optimal setups and fast cars scrape the chassis for the most part. If you set ride height so that you don't touch down at all it's probably going to be considerably slower than the optimal setup... That being said the usual scraping should be only on the far edges of the sides of the chassis and slightly diagonally across the rear... If you are scraping or touching down in the middle of the chassis or in the front then you are too low or your suspension setup is not right...
hi man thanks ! but will a chassis that is scraped badly at the sides can cause the chassis to tweak more easily ?
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Old 02-07-2011, 07:13 PM   #5
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hi man thanks ! but will a chassis that is scraped badly at the sides can cause the chassis to tweak more easily ?
Sounds like your chassis is fatigued from age and excessive flex causing scraping. Most of us run about 5mm ride height on asphalt and have moderate scraping. Sounds like you are way beyond moderate.

So will it flex more- yes. Will it tweak more easily- very probable. If you are serious about racing, a new chassis once or twice a year will do wonders for your handling consistency.
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Old 02-07-2011, 09:56 PM   #6
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Sounds like your chassis is fatigued from age and excessive flex causing scraping. Most of us run about 5mm ride height on asphalt and have moderate scraping. Sounds like you are way beyond moderate.

So will it flex more- yes. Will it tweak more easily- very probable. If you are serious about racing, a new chassis once or twice a year will do wonders for your handling consistency.
actually its more of the tracks over here are not smooth, some poritions are higher and some lower.
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Old 02-07-2011, 11:48 PM   #7
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hi, i see you are in KL, where do you play usually? Glenmarie? i have a T3 2011 and it will scrape a little on the motor side at the Glenmarie track. i did increase the ride height a little 5.5/6 mm F/R but it still scrapes, i think the only way around it is to reduce the flex of the chassis (running stiffer) but it may affect the overall grip. i checked with a few other guys, they also scrape the track a little, especially if we run a little wide where the track does appear a little more uneven.

just out of curiosity, care to share this home made protective film? anyway, my chassis is not brand new, has battle scars already
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Old 02-08-2011, 03:22 AM   #8
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hi, i see you are in KL, where do you play usually? Glenmarie? i have a T3 2011 and it will scrape a little on the motor side at the Glenmarie track. i did increase the ride height a little 5.5/6 mm F/R but it still scrapes, i think the only way around it is to reduce the flex of the chassis (running stiffer) but it may affect the overall grip. i checked with a few other guys, they also scrape the track a little, especially if we run a little wide where the track does appear a little more uneven.

just out of curiosity, care to share this home made protective film? anyway, my chassis is not brand new, has battle scars already
hehe nice to meet a fellow malaysian, my top two tracks are titiwangsa and glenmarie, both are very uneven, for titiwangsa, the problem is the track isnt flat and is banked, so at certain corners sure scrape. for glenmarie, the track has better traction, but the surface wasnt flattened properly, hence many sections are choppy if you know what i mean. in fact i have yet to find a really nice evened surface track in malaysia. Even kota raja track is quite bad.
i made my own protection from file lamination or projector transparency. they work well, but require changing after every end of day running. the painful parts is removing the sticky double sided tape residue, then repasting new tape and a new lamination. i can post a photo up here once i get home. i use to remember my car handling really well even after hits, but now it handles well, but you hit a bit, tends to tweak.
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Old 02-08-2011, 03:41 AM   #9
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I don't know a lot about woven graphite, but here's what I've learned recently : apart from flex and wear, the ageing of a CF plate will make it less prone to come back flat. I've experienced this with a brand new out of the package xray top plate. It just stays tweaked if you twist it, even slightly. My understanding is that exposure to sun makes the ageing worse. ( Making the plate looks more brown than grey)
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Old 02-08-2011, 06:27 AM   #10
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I don't know a lot about woven graphite, but here's what I've learned recently : apart from flex and wear, the ageing of a CF plate will make it less prone to come back flat. I've experienced this with a brand new out of the package xray top plate. It just stays tweaked if you twist it, even slightly. My understanding is that exposure to sun makes the ageing worse. ( Making the plate looks more brown than grey)
hmm, thats a good point, that means i need to check my top deck too!. Rs hair, here is my chassis protector after cutting.

notice i avoided the battery strapping tape area to prevent the protection from peeling when i remove the batteries.

the sheet before cutting.
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