Searching a tune for toyota trueno

Hi, recently I wanted to do some, time attack ? I think that’s how you said it in english. On the greendale club circuit.
So I did look at the best time in A800 and in 29 positions there was a Trueno, i watched it a bit and i can’t beat it at all, and i don’t get how he has that much speed on the straight.
On the straight he probably goes over 270 km/h, i only race with trueno, and already try different tune, but i’m really a noob when it comes to tuning a car.
I tried a lot of different things and I can’t even reach his speed. Well i was pretty close but with stock wheels so, no grip at all.

So do you have a tune to share for the trueno in A800? Or some advice ?