Evening All.

Would be very interested in getting people opinions on my rolling road print outs that I got today.

Some info on the car…It’s a 1972 fitted with a Cossie YB that was rebuilt two years ago. It has a 4WD manifold and T34 Turbo with a .63 housing. It is fitted with a 2.5 inch straight through exhaust; maybe I should put a back box on it for some back pressure???

I have a large type RS500 (Cheap version) intercooler. I have checked all pipes and am happy that I do not have any boost leaks. I pressurised the system up to 1.2 bar and cannot find any noticeable leak.

I have fitted a Stg 3 MSD Chip. I am running a new Amal valve that was fitted with the standard 2mm insert in the R port.

I have been reading about adjusting boost by jetting the amal valve. Long story, but I drilled out the insert to 4mm and these are figures that the car is now producing. I have a -31 actuator set with 4mm pre-load as described.

We removed the insert in the R port for a test run and the boost spiked to 1.6 very quickly and the car made 296BHP…. The amal valve does click when I remove and re-connect the electrical connections to the valve…

The owner of the rolling road told me that his road reads pretty tight and if i brough this car to another rolling road, it would be possible that the car would read closer to 300BHP....

I am interested to know is the boost tailing off to quickly…Any advice would be great…

Driving the car now is mental, 2nd gear at 6,000RPM will light up the rear wheel while running 195/50R15 tyres…

Power & Torque Graph[img]

Power & Air/Fuel Ratio Graph


Power & Boost Graph