Gaz or BC coilovers

[Sonic Boom]

800lb rear springs! Why?

Quick answer: Reduce understeer
Rich

 

[Mr Trailer Man]

Quick answer: Reduce understeer
Rich

That's like 14-15kg springs, shouldn't be getting that much understeer on 650lb springs to need to go up to 800lb.

What's the rest of your setup like?

 

[Sonic Boom]

Gaz Golds all round 500/lb front 650lb rears
PMS Strut brace and top mounts
Whiteline RARB
PMS Rear Beam
Black Series Bushes (replacing all rubber bushes)
Roll Centre Correction Hubs
Gripper LSD
FIA Sassa Rollcage
197 Brembos conversion
Pro Race 1.2's fitted with 195/50/15 Extreme VR2's in R5 compound.
Also to bear in mind this has a full interior and is probably still weighing in at over 1000kg
Rich

 

[Mr Trailer Man]

Have you tried the R7 compound? Maybe the softs are going off too quick.

Wouldn't have thought you'd be getting that much understeer with that setup, it's mega!

 

[Sonic Boom]

The R5's are brilliant wouldn't swap them for the world I'd say they are on a pair with the Avon ZZR A24 compound.
It's not terminal understeer but I'm not getting the rear to rotate as much as I'd like plus I need to up the front poundage to reduce some of the roll (ideally I do this with the front ARB but you I can't replace it with a rose jointed item due to to the regs) so I need to up the fronts and in turn up the rears hopefully with AST's with their improved damping over the Gaz Golds this should give the desired results but I can let you know on my first day on the 21st Feb.
Rich

 

[Mr Trailer Man]

Is it Sprints you do?

 

[Sonic Boom]

Hillclimbs, I do the Midland Hillclimb Championship and the Leaders and the odd Curborough (Mainly for testing as it's just up the road and cheap)
Rich

 

[Mr Trailer Man]

A different game to trackdays then i suppose.

 

[Sonic Boom]

Ye the longest run I do is just over 60 seconds.
Rich

 

[Mr Trailer Man]

Do the tyres even get warm 😂

 

[Sonic Boom]

That's why I spin the life out of them before a run and why you need to run the softest compound possible.
The proper race boys running on slicks use Avon's in A15 & A92 compound push your thumb into them and it'll leave a prefect mark of your thumb print.
Rich

 

[Mr Trailer Man]

I take it tyre warmers or pre warm ups are not allowed?

 

[Sonic Boom]

No artificial tyre warming is allowed but you can "Spin Clean" your tyres in the predesignated area before the Start Line.
Rich

 

[JB21]

800lb rears wow, thought my AST's with 550lbs where firm. Presumably your's isn't road legal?

 

[Sonic Boom]

800lb rears wow, thought my AST's with 550lbs where firm. Presumably your's isn't road legal?

Totally Road Legal, Taxed, Tested and MOT'd it has to be for the Road Going Production Regs although I rarely drive it on the road.
I take it to and from events on a trailer towed behind my Motorhome.
Rich