Weird problem

[Gregory Chan]

Hi all,
         I have been on this list now for quite a while now and I 
have learnt much about fuel injections systems, however, I have a 
problem which I am at a loss to solve. The car is a Toyota Corolla
GTS with a 4AG motor. I have 10.5:1 pistons, 288 cams and a tweaked
stock EFI system. The motor redlines the gears up to 4th, however, 
5th does not go past 6,000 rpm and I am losing quite a lot of top 
speed here as the redline is at 7,500 rpm. I have done an indicated 
speed of 210 km/h with the present wheel/tire combination and a stock 
engine @ 7,000 rpm in 5th gear before. 
       Has anyone here experienced something like this before and can 
offer some suggestions? Any suggestions are welcome.

Thanks ,

gchan at compserv.senecac.on.ca