Originally Posted by lawnsy

Closed loop normaly works till the car comes onto boost then reverts back to the map but the bigger the turbo the more rpm you can get before it comes on boost so i t4 car will come on boost later than you t38 so will get a higher top speed in 5th gear before it reverts back to its map......

anyhow pete i bet yours is getting mint mpg at the min.....lol