MG Midget and Sprite Technical Suspension Set-Up BBS discussion at MG-Cars.info

MG Midget and Sprite Technical - Suspension Set-Up

Peter I'm no expert but a very amateurish (and clumsy) amateur, but here are a few thoughts: How far you modify will depend on the rules that apply. Section S in the Motorsport UK (formerly MSA) 'Blue Book' is your guide for any event running to MSUK rules. http://www.motorsportuk.org/assets/bluebook2019revisedversion.pdf Other sprint series are run by the likes of Javelin but I have no knowledge of their class structure or what their rules allow. I hillclimb my Sprite in the 'Roadgoing Production'class - a hillclimb is a sprint where the finish is a bit higher than the start and the same rules apply. Polybushes and 1.5 degree trunnions improved the turn in no end and almost eliminated understeer. I have 400lb front springs lowered 1/2". These reduced dive under braking and almost eliminated rear-end lock-ups. I think the thicker anti-roll bar would help as my Sprite still rolls a lot with a 9/16" ARB. Make sure you investigate beefing up the mountings as stiffer bars can lead to the mountings failing. I have 1 1/2" lowering blocks on the rear. Think carefully about this one as square rear wheel arches will restrict the tyres you can fit, I don't think it's a problem for round wheel arch cars. Before fitting the blocks my car had a distinct 'rake' and the elevated rear end helped go give it severe 'roll-over steer' on tight corners (i.e. embarrassing tank slappers or spins!). The lowering blocks have removed the roll over steer - I just find other ways of generating embarrassing spins, like putting one wheel on the grass when braking hard in front of the main spectator area on my last outing. The shock absorber valves sound like a good idea. I'd be interested to hear how you get on with them. I have adjustable telescopics on the rear and setting them too stiff just caused handling issues! If you're in Clwyd you're only just up the road from the Loton Park hillclimb track where I hang out. This weekend's meeting has just finished but the next one is the weekend of May 18/19 and the Austin Healey and MG clubs will be there the weekend of August 24 and 25 so why not pop over and have a chat with folk and check out the mods folk have on their cars. Good luck and keep us posted on how you get on. Colin

C Mee

Peter Best setup I ended up with was- Front 1 deg neg camber 550 lb springs 3/4" bar Bilstein gas telescopics set on stiff/stiff Rear Re-arched flatter std rear springs with an extra second leaf in the front half only Removed the spring mounting towers from the body and extended them as far as possible about 40mm from memory to lift the front of the spring up into the body-This was to eliminate turn in understeer and as Colin mentioned don't go too stiff with the rear shocks and just a normal 50/50 shock setup--if the rebound setting is too heavy it tends to gradually suck the car down while you're going and ends up a horrible skippy little mess If you have 25% up valves for the rear that's about as much as you want / need willy

William Revit

This thread was discussed between 21/04/2019 and 22/04/2019

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