Oh one of the best thing you can consider is a lightweight hood. The stock Iswara hood is heavy like a mofo. Lightening the front is one of the best things you can do - BUT... please note that the safety of the car is heavily compromised if you change to a fiber hood. I don't know if they make a CF hood for Iswaras...
Cant imagine the engine doing well for long periods of time at that speed, it should be at redline already at 180kmh in 5th gear.
Its kinda quick for an old tech 1.3 manual. Maybe due to the lesser weight. This car feels like its gliding on a layer of air at high speed.
I think it can hit 180kmh, but then again its only hit, that means you cant maintain that speed for long, my guess a minute or two. I tried 160kmh in my 1.3 saga before, the car felt unstable, the engine noise, and wind noise all point towards a very stressed out chassis and engine. At 180kmh it should well be in the redline zone of rpm range. Thats not good for long periods as the oil between the engine bearings are shearing rapidly and generating a lot of heat, and thinning the oil. Also dont forget these cars have a very inaccurate speedometer, 180kmh on the needle could be only 170kmh actual speed.
That doesn't sound right. the 5th gear assuming its MT, is too big to reach redline.
You have to understand the iswara is a car from a different era compared to the persona. Its a 1.3L carb engine car, I owned one before, and drove it for 20 years, so I do know what I am talking about. Generally for those era cars, the smaller the cc, the higher the engine spins per kmh compared to a larger cc car. Whether its far away or not, I would need to recalculate, but my guess it would be at least 500rpm more to reach redline. Many 4 speed autos even of the same era has a OD gear that lowers the top end rpm. Those auto trans OD gear can actually be lower than a manual trans 5th gear.
