Please Help 3000gt in trouble

i have recently purchased a 3000 gt turbo r4 and i tuned it up to a turbo 3 stage and it was fine. Then i saved up and got stage 4 turbo. now when i get up to gear 6 it only gets up to 263 and then drops down to 250 and repeats itself. this is with a racing transmission and a triple plate clutch with a racing muffler. i have tried switching the clutch to normal and twin plate and i have tried switching the muffler to semi racing. i tried switching the transmission to normal and it went up to 350 and dropped down to 330 and repeats . i don't know what to do. can someone please help me out.:confused:
 
it does this bcause the car has reached its maximum level of rpm. when it does this, the revs decrease a little and the process continues until you slow down. hope that helped.:) ;)
 
You are hitting the rev limiter - look at the tach when that happens. The "upshift" light blinks when you are near redline, then you can go a bit over redline before the rev limiter kicks in and shuts you down.

Buy the racing transmission, and widen the gear setting, or make the final drive taller (lower numbers). Experiment.

[edit] Oh, I thought you had the Sports transmission. If you already have the racing transmission, go to the Settings panel, and adjust the "Autosetting" control towards "wide", or adjust the Final Drive setting to a lower number. Watch what happens to the gear ratios as you do those things, and see what that does to your top speed. Like I said, experiment for yourself and see what happens.[/edit]
 
Yeah, the whole transmission setting, but you've got another
problem. Your choice of car. It's got more extra usless weight on it than lots of other cars. It is renouned amongst tuners as a very difficult car to make fast because it is fat.
 
Go to Machine test... Then go to the MAX SPEED run... next go the SETTINGS menu, (hit X) then select SETTINGS... go over to the GEAR SETTING SCREEN... on the Bottom of the SCREEN select the AUTO SETTING and SLIDE IT THE RIGHT the whole way that should fix your prob. (the easy way):banghead:
 
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