Not really
I went from my 195/60/15 to 225/45/17 Nittos to get more grip - THEN I went to 235/45/17 Nexxens to drop the revs a wee bit but mostly so that I could use the Nittos on the front when on the track
195/60/15 --- 518/km - initial -- RPM at 96 mph (153 kph) - 5436 rpm
225/45/17 ---- 502/km - 3% larger RPM at 96 mph (153 kph) - 5248 rpm
235/45/17 ----- 495/km - 4.6% larger RPM at 96 mph (153 kph) - 5175 rpm
I'm having difficulty getting the Nexxens to grip - the slightly smaller Nittos appear to have more grip - so that is the limit - not the available torque
A taller diff might help - If I see one I will grab it - currently a 4.1:1 Subaru limited slip diff
On the 1/4 mile I got to 104 mph (no traction at the start)
195/60/15 --- 518/km - initial -- RPM at 104 mph (168 kph) - 5946 rpm
225/45/17 ---- 502/km - 3% larger RPM at 104 mph (168 kph) - 5762 rpm
235/45/17 ----- 495/km - 4.6% larger RPM at 104 mph (168 kph) - 5682 rpm
No chance of getting there with the 15 inch wheels! - no grip
I intend to try the Nittos at the next meeting
The chief forklift motor Guru (Major) has said that my motor "should" be OK at 6500 rpm !!!
At 6000 rpm with the Nittos I would be doing 175 kps - 109 mph
At 6500 rpm - 189.6 kph - 118.5 mph