<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> However we still haven't been able to get our engine past 7500 rpm.
I think it might be because the ignition timing we are running is too far advanced but when I retard I get a lot of back fire in the exhaust.
There is also have backfire in our intake manifold from time to time and our MAP sensor is malfunctioning currently. </div></BLOCKQUOTE>
The timing can be verified very easily with a timing light on cylinder 1's coil. Find out what your actual timing is based on; say a 30 degree advance on the PE. Always have that offset (there will be an offset if you use the stock wheel) at the back of your mind. We ran last year with the ignition map flat at 50 degrees of timing and 30 degrees of 'real' timing, and had no issues. (The engine, however, would run out of 'usable' advance at about 11000 rpm, would backfire there and was a pain in the noise test). When I started this year, I used that as my starting point. Still works fine.
Once you are confident of your ignition setup, go back to your fuel table, and change fuel values only, hopefully with a multiplier like 1.05. That should allow for finer control, and should yield positive results.
Post back here if you have any news.