Just had a panic re throttle return spring

[BMWChris]

Hi,

am away from my blue book for several days. Am probably going to substitute my everyday Boxster for my Midget at a hillclimb next week. I've done it before (last time the Midget broke down!) but I've just had a panic. Does it still need a second throttle return spring? Reason for panic is that I have never seen the Boxster's engine - it is mostly got at from underneath - and wouldn't have the first idea where the throttle cable goes. Last scrut didn't check - I opened the bonnet and boot and he looked into two nicely carpeted holes.

[Rescue Dude]

The scrutes kept pestering me last year because I needed a second throttle return spring so I think the answer is yes.
Though i'm sure they'd let you run without one for now till you can get something sorted.

[Bunman]

Hi Chris,
Pretty sure your Boxster will have a fly by wire throttle body so there is nowhere for you attach any secondary spring.

Cheers
John.

[team knifedge]

I doubt there is a physical connection between the pedal and the engine - just some random 1's and zero's flowing down a bit of wire......

[PaulR]

The requirement isn't for a 'second throttle return spring'.

J5.4.2 Be equipped with a positive method of throttle closing by means of external spring/springs so that in the event of a failure of any part of the throttle linkage the throttle(s) are sprung closed.

J5.4.3 Vehicles fitted with electronic throttle control as standard original manufacturer's equipment for that vehicle are exempt from this requirement.

I think this all stems from Weber carbs having internal springs that couldn't be checked and were frequently broken.

Paul

[Bunman]

Originally Posted by PaulR

The requirement isn't for a 'second throttle return spring'.

J5.4.2 Be equipped with a positive method of throttle closing by means of external spring/springs so that in the event of a failure of any part of the throttle linkage the throttle(s) are sprung closed.

J5.4.3 Vehicles fitted with electronic throttle control as standard original manufacturer's equipment for that vehicle are exempt from this requirement.

I think this all stems from Weber carbs having internal springs that couldn't be checked and were frequently broken.

Paul

Spot on Paul.

[jo white]

It also stems from 2 stroke bike engines having internal springs in carbs, during the 90s many scrutineers would have me pull a set of carbs apart to prove they had springs. Hopefully now things have improved

[BMWChris]

Hi,

thanks for the replies. Its a 2000 Boxster so I'm not convinced it will have a fly by wire throttle or at least the connection might still be a traditional cable that actuates an actual throttle electronically.

[siany1997]

I interpreted the regs as being carb specific rather than injection, so have no mod. No problems at Harewood thus far. Scrutineered at least 6 times this year including one at three sisters.
But none of the above means I'm right
I may have just been lucky, one entrant at Harewood this weekend was told to take his show number plate off and put a proper one on or he was going from 1b to mod-prod for the purposes of scoring Barc yorks entrants.
Those on here that call themselves pedants didn't come close...

[Fireblade]

There was one Northern venue that a few years ago enforced tyre valve dust caps on all Schrader valves IIRC.
There wasn't a trailer tyre valve safe in the trailer park that day.
Must be those flat caps and whippets that affect the Northern scrutes minds.