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#11 Re: harley or BMW sequential box for under 160hp setups
Rallytwit Posted on: 2015/10/18 20:01
Having raced a bike engined car for a few seasons I find the sequential box has a few big advantages for me; the first is the speed which you can go up and down the box, there is the ease of use (up or back) and the clutchless shifts freeing up the left foot.

For road racing braking with your left foot is an advantage but there is also the left foot braking (rally technique). I often get asked how I manage such high corner speeds. While trail braking accounts for most of the corner entry, the last bit comes from preloading the throttle (after I'm done with the heel and toe downshift) preloading the throttle ever so slightly gets the rear of the car to squat without unloading the front. I manage this now but it's a lot easier to do with one foot on the brake and one on the gas.

End of the day while I can do whole double declutch heel toe downshifts all day long, I'd rather have the faster and easier sequential/bike transmission.

Tom


#10 Re: harley or BMW sequential box for under 160hp setups
D Posted on: 2015/10/18 12:34
I suppose its a matter of what you like but I drove a locost with a zx12r and its a blast.

The simplicity of the shifts and response is just something that stimulates the experience.

I dont expect an A series to rev like a bike but they can come close


#9 Re: harley sequential box for under 160hp setups
1200rallycar Posted on: 2015/10/18 9:08
Im interested to hear why your keen on sequential?

I love using the clutch on downshifts to control the car. But they probably comes from use in rally more than anything

To me the clutch is way too much fun to go to sequential 😛


#8 Re: harley sequential box for under 160hp setups
D Posted on: 2015/10/18 3:18
found a complete bmw 1200 box with reverse could this be used behind our lil As?

http://www.ebay.com/itm/99-00-01-02-0 ... :~08AAOSw5VFWHRyq&vxp=mtr

no idea how the clutch mech works or could be incorporated????


#7 Re: harley sequential box for under 160hp setups
D Posted on: 2015/10/18 3:09
Some good points Tom, I really like the quaife reverse but there are cheaper options no
I guessed its only for the cluey with a lathe or right equipment but once sorted
doing more of them or replacing a harley box is cheaper and end of the day sequential.

Some $aving by using a permanent magnet starter motor which are stated as good for most
under 2litres engines, strong planetray gears and can be wired to do the job albeit durability.
Wont be as good but at least its cheap and doesnt add extra weight. Planetary gears are strong.

http://what-when-how.com/automobile/p ... starter-motor-automobile/


#6 Re: harley sequential box for under 160hp setups
Rallytwit Posted on: 2015/10/17 19:32
D I have beat this up quite heavily with my machinist pal; if like him I had the ability to machine parts it could indeed be a budget set up. There are few ways to do this as mentioned. You could use the bike box and a Quaife reverser box. That would be about $2000 for parts. You could use the Datsun bell housing and input shaft to drive the bike box then use the Datsun center plate and tailshaft housing on the output side. That could be as little as $750 in parts.
The maching bill would, even at super discount rates, be an easy $2000 and more likely $4000. At the end of the day we'd have a box that could cost $6000, which brings us to the point where you could buy one outright.
It's a fantastic idea but sadly I don't machine, I wished like many bikes and cars we had an off the shelf option that didn't cost as much as my car.

Tom


#5 Re: harley sequential box for under 160hp setups
D Posted on: 2015/10/17 15:27
you know by now your opinion not mockery is valued,
hard way for a budget sequential setup no doubt there!.


#4 Re: harley sequential box for under 160hp setups
1200rallycar Posted on: 2015/10/17 14:19
Wow.... thats doing stuff the hard way...

Nothing about this is easy
Best to look at torque rather than hp when specifing gearboxes.. and an extra 300kg out of 800 is 37.5%... thats massive in design terms

Please dont get offended and rhetoric with personal attacks which are incorrect like last time. Im just trying to give you some engineering logic


#3 Re: harley sequential box for under 160hp setups
D Posted on: 2015/10/17 14:02
chopped up 56a for extra ratios :)
just use 4th for direct and reverse
with a ferrari like shift guide plate
to block going into 1,2 and 3.


#2 Re: harley sequential box for under 160hp setups
Dundee1000 Posted on: 2015/10/17 4:55
what about going backwards Big D?
or use that starter flange with a clutch on it or something?



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