Fostek's R&D department

[Fosworth]

Re: Fostek's R&D department

And some pics of the Anti-roll bar. Its mounted on spherical bearings rather than rubber/Poly bushes to ensure it doesn't bind up.

[mjv]

Re: Fostek's R&D department

Great video of your super slick gear shifts. Awesome sounding little screamer. Any pics of the Anti roll bar ???

[FOSSIE]

Re: Fostek's R&D department

Sounds like a bag of spanners!

It's a big relief now the shift system is playing ball. What a headache that's been. Although it did 'work' straight out the box, it wasn't quite right. It was quick, way quicker than you could achieve by pulling a lever by hand, but clearly something wasn't right. These Sadev units require a relatively high force to move the linkage, not only that but the force ramps up quickly due to high spring rates in the barrel detent mechanism, and cam design. The fact that the mechanism started moving quickly when you fired the air cylinder, but then rapidly slowed down, was occasionally confusing the electronics.

More force was needed! Fitting a bigger bore cylinder and/or higher operating pressure is easy, but you need to match the solenoid valves to the rest of the system... Finding valves of the right format, quality, flow capacity - importantly - switching speeds was a bit tricky. Most of the paddle shift systems on the market uses solenoid valves which are slow to switch on. Typically 40-50mS. That means when you press the button to demand a shift, nothing happens for the first 40-50mS whilst it waits for the solenoid to turn on the air, then the mechanism starts to move... I want the whole shift to happen in less time than that! Fast switching valves are generally either 24v, or very small (restrictive) or both. Anyway, the valves currently in there have a switching speed of sub 1mS, and although they are theoretically a bit small, the shifts are superb. Quicker than Sadev though possible!

Anti roll bar is fitted, bit of a guess at what rate is required so I've gone with something at the softer end of the scale. Easy to swap for stiffer tube if required.

Not sure what's next actually. Probably time to freeze development and get some use out of it!

[Toymex]

Re: Fostek's R&D department

Stunning car one of the very best

[eric]

Re: Fostek's R&D department

O yes that's nice

[4parajon]

Re: Fostek's R&D department

All work for me except the first one. Sounds epic

[105Ian]

Re: Fostek's R&D department

Yes John they are working a treat , just like the car :-)

[Fosworth]

Re: Fostek's R&D department

Please can someone try the links in my two posts of today to see if I have got them working now.

[Graham]

Re: Fostek's R&D department

Try again !! https://www.facebook.com/10000834894...9856660635950/[/VIDEO]

that one works

[Fosworth]

Re: Fostek's R&D department

Does either link work please ?? They are direct to Facebook and I can view them so I'm thinking it may be to do with privacy settings in Facebook. Any helpful suggestions please.

[eric]

Re: Fostek's R&D department

And here is a video of the car running at Croft but we have improved the gearchange since this was taken. I just love the engine noise !!https://www.facebook.com/10000834894...0654598889490/

Your link doesn't work I was looking forward to seeing the video

[Fosworth]

Re: Fostek's R&D department

And here is a video of the car running at Croft but we have improved the gearchange since this was taken. I just love the engine noise !!https://www.facebook.com/10000834894...0654598889490/

[Fosworth]

Re: Fostek's R&D department

Try again !! https://www.facebook.com/10000834894...9856660635950/[/VIDEO]

[Fosworth]

Re: Fostek's R&D department

Please be patient if I cock this post up but I am hoping this will be a video of the gearchange on our car working properly. It has been a long journey to get the pnuematics and software sorted but I have now driven the car in anger and it is amazing. If this works I will post a video of the car running at Croft.https://www.facebook.com/10000834894

[Warrior]

Re: Fostek's R&D department

Will give them a try when mines ready then