Throttle return springs for a sprint event

[boggissimo]

I'm doing the VSCC Pomeroy Trophy at Silverstone in a few weeks, a sprint with other cars on track (some of them vintage cars), with each car having a target number of laps to complete.
http://www.vscc.co.uk/page/events?eventID=1098

It is being run under roadgoing series production car sprint regulations but some aspects of circuit racing regs also apply, and I just want to make sure I won't get turned away at scrutineering.

MSA Blue Book J5.4.2 says there must be a mechanism to positively close the throttle in the event of a failure in the linkage - would there be one as standard on a blob WRX engine? Looks like there are two springs in case one fails, but I also seem to have two places where the throttle cable could go, so not sure whether one is a failsafe or acts on the other linkage... anyone? Seems like a simple question but I'd rather look silly now than after driving to Silverstone!

[C. J.]

Has a spring fitted as standard
Best of luck

[Scott.T]

How would they apply this to a DBW system as it's all controlled by the ECU

[boggissimo]

Electronic throttle setups are exempt

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[Ginola]

Originally Posted by boggissimo

Electronic throttle setups are exempt

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What car are you going to run in it? Quite interested looking at competitors info it seems very open

[boggissimo]

Originally Posted by Ginola

What car are you going to run in it? Quite interested looking at competitors info it seems very open

I'm doing it in my blob WRX wagon. There's a complicated handicap formula based on engine size, car length and year of manufacture that tries to even things out, and modern cars rarely win.

To enter you need to be a member of the VSCC and have at least a national B race licence.

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[Ginola]

Originally Posted by boggissimo

I'm doing it in my blob WRX wagon. There's a complicated handicap formula based on engine size, car length and year of manufacture that tries to even things out, and modern cars rarely win.

To enter you need to be a member of the VSCC and have at least a national B race licence.

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I have the 2nd bit, would need to join VSCC, interesting with the car length.

[asperformance]

the ruling is historic and basically applies to then likes of twin carb set-ups, etc. where additional external springs had to be fitted to ensure positive closure

[boggissimo]

Originally Posted by Ginola

I have the 2nd bit, would need to join VSCC, interesting with the car length.

TBH unless you have (access to) an eligible vintage car, I wouldn't bother joining the club just to enter the Pom. Entries close on 6 Feb and I doubt if a new membership would be possible by then, they've only just moved from needing to be nominated by a current member to be allowed in at all, and everything moves very slowly. Plus it's £90 or so for a new membership!

I joined last year as my Dad has a MG J2 and does some hillclimbs and sprints, and we have done a few things as double-drives (I beat him by 10 seconds in the Pembrey sprint last summer ). The Pom is the only VSCC event that can be entered in a post-war car.

[boggissimo]

Entry list has just come out, there are 144 entries, covering more than a century of manufacture!

I'm in one of two post-war groups, with a target of 13 laps in 40 minutes (3 mins per lap), which over 3.7 miles works out at an average of about 70 mph. Not really sure how they work out the target, as some other cars on 13 laps are:
Triumph TR2
MGB
Saab 900
MX-5
Clio 172
and a Fiat Panda 1400! Driven by the bloke who is driving this monster:
https://www.youtube.com/watch?v=q7fg3ena88k


There's another Subaru (Forester XT 2.5) but it's in the other post-war group, and he's got to do 15 laps.


Some details on their facebook page here (couldn't work out how to link directly to the post itself).
https://www.facebook.com/VintageSportsCarClub

[C. J.]

Good luck I'd of popped up but will be helping a friend out with some scaffolding.