Sequential shifter conversions??

[mrshin]

1jzracing... so you're saying your W box is fitted with dog innards? Details, please:-)

[1jzracing]

YES! not a bad set of ratios

2.5 1.7 1.3 1 0.78

its all square cut and dog ring so makes a hell of a racket wines etc.... more like screems!

it was made by PAR in Minto NSW

Ive had a few problems but its sorted now ... mostly oil related as im constant high rpm like 5.5 - 7.8k all the time it just cant keep oil on the teeth so ive now rigged up a small external pump etc

its real brutal to shift but all dog boxes are, takes only a fraction of a second to hook the next gear

i think he does them with syncros too now

[mrshin]

*is potentially excited*
While I need to talk to PAR about it, a little customer experience never hurts. How would you rate the increase in strength over the standard innards, the noise, and what did it cost you?

[allencr]

Citroen did it with hydraulics in 1956, but went for a semi-conventional
pattern. Considering their other French type things, I'm surprised they
didn't have it reversed & upside down.

Sorry, I don't really understand the fascination with this subject!

[1jzracing]

*is potentially excited*
While I need to talk to PAR about it, a little customer experience never hurts. How would you rate the increase in strength over the standard innards, the noise, and what did it cost you?

i got it in stages and there was a bit of development we went through and it was a couple of years ago now, i put my one together too so i dont know the cost these days it will be around $5500 at a guess

the strength is much much greater probably handle anything up to 650hp

give him a call Sam is the guy hes pretty helpful

[kingmick]

i got it in stages and there was a bit of development we went through and it was a couple of years ago now, i put my one together too so i dont know the cost these days it will be around $5500 at a guess

the strength is much much greater probably handle anything up to 650hp

give him a call Sam is the guy hes pretty helpful

no offence ment at all! but if they do your talkinh in the same league as a $18k hollinger box.
if you could do one for $5500 id buy ten! but at 650hp i can tell you unless they are in the hollinger league they will be broken very quick! at 650hp with a hewland VGC{at the time $50k of gearbox and diff} we kept breaking them for a year and a half until hewland came to the party!
be nice but you would want a low torque or very late torque engine for a $5500 dog box to handle it. i have seen r154 boxes handle nearly a full season behind a 650hp 1j ,but it was a light car and he was gentle. the t50's dogboxes that i use are very good and i get them at cost and there $5500.
it would be nice but!

[1jzracing]

it ALL depends on the driver the set up and the traction, they have been put behind turbo rotors on slicks with at least 650 -700 hp and survived well drag racing so they are strong!

i have been pushing 330 Rw Kw through one for well over a season of circuit racing in a 1100kg car with 12" wide slicks and its never broken, thats more than 8 full meetings with up to 1000 gear shifts each meet ... compare that to a night of drag racing ..... say 20 gear shifts! - it does a lot of work

a standard W box does about 2 meetings and it rips all the teeth off the input shaft, sure a 154 might last longer but the ratios are still crap!

as far as direct strength goes they will handle big power but the selector forks are a little on the light side for dog clutches so a bit of care is needed and they do suffer from an oiling problem at prolonged high rpm and big load, mine did wear through the hardening on some of the gears when i opened it for inspection.

i have just fitted an external oil pump and cooler, this is a problem all circuit gearboxes suffer and many people fit pumps, the real good ones like hollenger probably have an internal pump

[510rob]

http://www.queuebert.com/other/thesis/

[oldcorollas]

thats awesome

but it would suck running out of gas

[Hen]

510rob, is that guy a friend of yours? It looks like a hell of a lot of work went into it.

That's the sort of system I was thinking of, only with added functions.

Hen

[RobertoX]

510rob that is very cool... looks like quite a fun project!

in the past 2 years the formula SAE car at my uni has used a pneumatic shifter with a small CO2 canister, a solenoid valve and a double acting cylinder. A microcontroller being used for something else gave it pushbutton operation from the steering wheel and controlled ignition cut. The gearbox is already sequential (standard CBR600 box) so the leap to semi auto operation was fairly striaght forward.

The gas would last quite a while afaik, I can't remember how many shifts but I'll see if I can find out tomorrow. It also had a manual override in case the pneumatic ran out of gas or just shit itself.

[510rob]

So there you go - now you've all seen that it can be done, so what's stopping you from going out there with the chop saw and torches?!? juuuust kidding...

Derek's system was a little finicky, but at least proved the concept as viable. He is a member of my local Datsun club. I'm sure he would have been right in there on a FSAE car, but SFU didn't have one (I think they still don't have one)

It would be pretty cool and all, but I'd prefer a mechanical system like that Japanese setup for the Nissan transmissions. Better yet, a nice Hewland DG300 with the engine mounted mid position would be even better!!!