Error 54, Does error 54 on the st205 slows the car down? Options

[Rav4Race]

Hi guys/gals... I own a Rav4 model year 2000 and ive swapped in a 3sgte st205. The engine seem to be perfect but however my check engine light is on... I bridged E1-TE1 and ive detected an error code 54. Ive read in a message posted by insanity on 6gc.net, where he proposed to bridge the coolant level sensor, which i did! But the problem is still persisting, my water pump is working.
Well guys i need help, i dunno if my car's boost has lowered because of the 54 error code? Or is it that i havent changed my fuel pump which is holding my car back? But Rav4 use a 2L fuel pump, n i doubt that this is the problem. Plz advise me:(
Another question, after bridging the sensor, should i take out a fuse or something just to delete the problem from ecu memory?
thnx for all;)

[Rav4Race]

Hi guys..
Got some news:)

Well i sorted out the error 54 code and the power has improved a bit.

But the problem which am now facing is that am getting a low turbo boost:( My turbo is

not boosting more than 0.4 bar:(

Do u think its because i havent changed the rear diff? Am still running with my 1AZ rear diff

but can a diff reduce the turbo boost??

plz help and thnx again bros:)