we need help

despit the fact we repair these cars night and day but often the modifications we dont always get involed with.we build race lotus cars with k series engines,and my green mgf is used to road test the engines as the race cars arnt road going.so my green car can get 10 engines a year.she spends more time in bits then she does complete.but we need to uprate the brakes.the 160 brakes arnt up to the job any ideas.and lotus ones dont fit.

You say 160 brakes do you have the 305mm discs an 4 pots or the 2 pot AP's

You need to be looking at upgrading the rears from the standard 240mm to about 280mm

There is an upgraded setup in the pipeline. It's been there for a while, tbh,

The latest I have been told is, 266mm discs all around with a 6 pot front calliper and a 4+2 calliper at the rear.( 4 for braking 2 for the handbrake)

thanks,the problem we have is a race engine can be up to 230 bhp,and in order to bed the engines in we have to do some road miles.we have a full poly bushed mgf,that is used to test these engines,the lotus race cars cant be used on the road.so my poor abingdon has a different engine sometimes every week.we never get seized bolts.But braking from high speed and in order to get the engine to work hard the brakes simply fade and distort,we are going to remove the under front wing arches today to help air flow.And the mgf is a heavy car and at high speed it tends to want to go every where else but where you want it to go,but we are intending after we have built my wifes show room car and almost all the bits have arrived.Ive cheaped the spec.
we are thinking of building my abingdon to a fast road car with all uprated stuff on.mind you built my sons metro with a vvc 160 engine,upraded brakes .suspension,full body kit and painted light blue.0 to 60 5,7 seconds.its still a shopping car I tell him

Discs - are you using smooth or groved or groved and drilled?
Brake pads - what spec are you using?
Hoses - are these standard or braided?
Fluid - are you using DOT 4 or DOT5.1?

drilled discs,160 front brakes,braided hoses and red stuff pads.it does have a lotus race spec engine at 235 bhp,and it is having to stop from a very high speed,under 70 is fine .but long braking runs are a problem.race track she is around 135 mph down to 0.the brakes simply cook,we think nit is lack of cooling air around the brakes

The redstuff pads are not really up to heavy use, better with yellow or possibly even blue and the dot4 brake fluid will fade, dot5.1 will take the tempreture much better.

You could also duct from the front bumper to the calipers.

we are using dot 5.its the last race engine we are testing we have a lotus we are going to start using,the mgfs simply struggle at high speed,stability is also an issue .the main problem will be down force,a race car at speed makes the tyres grip as the car slows the brakes need to ease off.We dont use abs as this is slower braking.