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Straight cut gears and gear boxes
What do you know about them?
Pro's and con's vs a standard gearbox. costs? worth it? I really need to pick someones brain here! |
well you can get straight cut gears but you will not like to drive on the street if you are picky about noise.
they are awesome though if you are looking for clutchless shifting. i am looking to get a set in the future but I have other things i need to straighten out first. If you need a set they are all over the place. they are also rough to put in and out of gear for normal shifting. they cost about 3-6k and if you are really making the power and you need or would like to shift that fast without losing boost then YES they are worth it! Also since you are in Austailia they are a dime a dozen for cheap! Get me one! |
Quaife make a dog ring gear set for the turbo II trans and third gen but sells it directly to Trust in Japan. I think it can be bought in Europe without having to go through Trust. the set from Trust is about $3600US last time I checked. if you can buy it in England it is probably about $2000US. I am thinking about a Jerico gearbox instead of the stock box upgrade. these transmissions are available in 4 or 5 spd and are nearly bulletproof and have all range of gears available. only problem is making an adaptor to the bellhousing. non of this would be useable on the street as the gear whine would be untolerable, but would be the hot setup for a race car, drag or road race.
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OK - thanks for the replys
My step fathers father is an engineer and he has been making straight cut gearboxes for rally cars over the last year and I could get one made up for my car for under $1000. My car isn't making much more than stock power at the moment but I was just interested to hear about the benifits/pitfalls of these boxes. Are there any power gains (or should I say less drivetrain loss) from these gearboxes? How does it make clutchless shifting easier? what would it be like on the street with say 330hp? (wheels) Thanks again |
Originally posted by JarrardB OK - thanks for the replys My step fathers father is an engineer and he has been making straight cut gearboxes for rally cars over the last year and I could get one made up for my car for under $1000. My car isn't making much more than stock power at the moment but I was just interested to hear about the benifits/pitfalls of these boxes. Are there any power gains (or should I say less drivetrain loss) from these gearboxes? How does it make clutchless shifting easier? what would it be like on the street with say 330hp? (wheels) Thanks again Straight cut gears are the most strong due to contact area "maximum" (line contact across tooth) in short they are much stronger across the gear tooth of similar width to a helical gear type box, you will notice a power drop a the rear wheels of around 2 to 5% with a straight cut gearbox as apposed to helical road box. Straight cut's do not suffer from axial bearing overload as this is not a component generated in the power transfer between mating gears, hence they can be designed much samller and lighter than a helical box to transfer the same engine power. In terms of the engement system, racing boxes use "dog rings" which have no synco cone or the little teeth that engage the clusters. The dogs are far stronger than a syncro box and the time require to change between gears is much quicker at racing speeds...the down side is that there is no syncro mechanism, so you either need to be very good at changing gear (ie heal and tow downshifts) or you will never live with this box. Some companies and maybe even your mate make straight cut gears but still use the syncro system, this can be done if you are having bearing failures and or gear breakages, however you will not be able to slam home the gearshifts like with a dog based box Hope this helps you out. I used to design these gears as well, when I had lots of time on my hands ! |
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