I am glad to say that despite the damp weather the old MGB went out last sunday and put down another 9.6 on its first proper test run this year.
We have done a few mods over the winter, mainly a new exhaust system as can be seen in the video attached. But another big improvement I think will be the new tyres. I've changed from Mickey Thomspon slicks to Hoosier slicks and they seem to perform a little better on my car. They seem a little stiffer on the sidewalls and make the car launch a little flatter as well with a lot less sidewall ripple at the same 12psi I normally run.
The new exhaust system is very free flowing now and I'm still running rich at 10-11 AFR with the timing knocked back by 8 degree's from theoretical ideal for the engine. Thats how we did the first test pass in this video.
http://www.youtube.com/watch?v=119ozwyI ... jw&index=3Then I decided to advance the ignition by 3 degree's to see how she performed. I would say the hit off the line was great. But the custom made Moser shafts that were supposed be able to handle 700hp had other ideas
I think the added 3 degree's of timing may have gained me maybe 50hp or so to bring the engine up around 570hp. But the torque generated on the launch with 12psi of boost and a nitrous hit of 140hp with a build time to 175hp in 0.6 of a second on the new slicks was obviously too much for the shafts. The left shaft snapped within 2 feet and the other shaft held full power for as long as it took me to get off the pedal. The skid mark from the drivers side tyre was about 10 feet long and had a nice curve to the left as the tyre dissipated the energy from the spooled engine as I backed off the pedal. She had 4 inches of air under the front left as soon as i left the line
http://www.youtube.com/watch?v=dSKYSH6v ... GyG4tfRrjwSo I'm now re working my old MGB rear axle. I have dropped a shaft off at Webster racing as they had the shafts made about 3 years ago for me. But this time I have told them to ask Moser for a quote to remake two more shafts, but this time I want the splined drive ends made to Ford 9" 31 spline pattern because I have figured out a way to convert my old MGB diff into a hybrid Ford 9" spool using mym old diff cage and rear axle housing ????
It may work, it may not work. But it will deffo be better than what I have now while I save up for a Ford 9" rear end for 2015 ?
Perry