Proton Iswara Modifications

Oct 1, 2020
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Hey sifus here, I'm wondering what can I do to improve my car performance. Not looking into engine swap as its not worth.
My iswara is a 4g13p
I have upgraded:
Spark plug
Exhaust system
Open pod
 

Izso

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Izso

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Hey sifus here, I'm wondering what can I do to improve my car performance. Not looking into engine swap as its not worth.
My iswara is a 4g13p
I have upgraded:
Spark plug
Exhaust system
Open pod
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...
 

lsm1991

1,000 RPM
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lsm1991

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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...
inb4 hood costs 1/2 the car
but yea... super heavy...
 
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alcyon

500 RPM

alcyon

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Wow! 1.3 can hit 180kph.......
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.
 

stupidcar

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stupidcar

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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.
My persona auto 4 hit 190kmh at about 5000rpm thereabouts only. Definitely far away from redline
 

alcyon

500 RPM

alcyon

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That doesn't sound right. the 5th gear assuming its MT, is too big to reach redline.
My persona auto 4 hit 190kmh at about 5000rpm thereabouts only. Definitely far away from 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.
 

stupidcar

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stupidcar

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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.
Show me proof of the gear ratio then I will believe.

Edit: No redline here
 
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alcyon

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alcyon

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Show me proof of the gear ratio then I will believe.

Edit: No redline here
No redline, ok i lost
So now we are now talking about 4th gear on auto vs 5th gear on manual now right? I will use other make from the same era as a comparison. GX80 Toyota Mark II, same engine, same tyre size, different gb type different diff.
1st MT :
1602563478211.png

Next AT :
1602563563322.png


Now first MT at 5th gear, Lets say 5000rpm, tyre diameter 627mm.
1602563798022.png

Now AT ,4th gear, 5000rpm
1602563875561.png
 
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minibeany

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minibeany

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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.

It does not need more power, it needs more handling.
yeah... experienced that before... was driving at 120-130 km/h and suddenly overtook by another fast car... my whole iswara like going to fly in the air...
 

vr2turbo

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vr2turbo

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yeah... experienced that before... was driving at 120-130 km/h and suddenly overtook by another fast car... my whole iswara like going to fly in the air...
My best handling for my VR was when everything was newly transplant and modded with new suspension. Doing 190kph felt like 120 only.....lol
 
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gunnerzz

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gunnerzz

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Wow! 1.3 can hit 180kph.......
Eh..my std blm auto can do that too. At least on speedo lah.
What its like?
Noisy like hell from engine noise...like an airplane. That time car was on aftermarket suspension and few UR bars are installed so still stable. I bet its only 160kmh-170kmh actual speed only.
Can i sustain 180kmh on speedo? I will never try that...my balls or pocket is not that big or deep.

My guess is the iswara actual speed is 160kmh at least. Iswara or saga starts to take off at 140kmh on speedo. Above that is flying speed or to be accurate its like a fighter jet doing a very low fly by. Watch any low fly by of a fighter jet and replace the jet with an Iswara.
 
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