BOOM!! Wa sudah datangggg....

This post has been edited by xandras: Oct 29 2011, 09:41 AM

Usually that's what Proton mechanics will tell u. In some way it is actually bad for the engine and the overall performance of the car.

Speaking from experience, some of the members in Persona club (including me) really don't feel any difference with the presence of VS, in terms of performance. GC yes, u will feel that ur gearshifts are smoother. But that's about it.

Why do I feel like us Persona members are not so welcomed here?

Why saga ppl weird?

V26 coming next..

Which is why I said 'in terms of performance'. I don't see how it is mechanically possible for a bunch of capacitors to improve ur car's performance. Yes, it may stabilize the voltage and reduce power loss when the air cond compressor kicks in, but that's about it. The difference after installing VS is too minimal to be considered as a 'performance mod'. Hope u understand what I'm trying to say here.

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Added on October 30, 2011, 12:28 amWell at least it's moving now..

This post has been edited by xandras: Oct 30 2011, 12:28 AM

The perfect formula for increased performance is still:

Increase airflow + increase fuel.

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Added on October 30, 2011, 12:41 am If dunno, can ask & learn..

And u know those SA didn't hantam ur car more than 120kmh during delivery?

My car 1st day dapat already hantam 170-180.

This post has been edited by xandras: Oct 30 2011, 12:41 AM

Well... Literally.. But increasing fuel & fuel pressure can be done by installing a fuel rail & fuel regulator.. Not just stepping harder on the pedal..

They sure hantam wan lah..

But when u get ur car what was ur mileage? Do u still remember? Mine was 30+ KMs. Duno where they drive my car to. When I first got my Myvi it was 7KMs on the odo. And that 7 KM came from the distance between the Sales Office and my house (they delivered it to my doorstep).

Well.. It's not a bad thing to have in ur car.. Serves as an extra, u'll never know when it might help u..

Then probably the night before delivery the SA drove my car out to go cheong clubber chicks la

Introducing bad elements here...

U punya mechanic mana belajar?

Kuala Sepetang laksa very nice leh

Actually, xW-30 weighted engine oil can be used for CamPros, but you will have to follow a very strict service schedule & service your car on time. With xW-30, you shouldn't be exceeding 5k KMs every service, and it is always better to alternate between xW-30 and xW-40 (not using only xW-30 all the time). This is to reduce wear & tear on the internals of the engine, such as pistons, piston rings/valve seals, etc. Some car owners prefer to use xW-30 on their CamPro due to the promising performance, lighter throttle & slightly quieter engine, but they do not know what's happening to their engine when they are using it.

Reminds me of my wira

Sunday mah.. No mod car do wat?

Y u no go find? XD

Eat kampung chicken before?

*click* >>>>>

Aiya.. It's ok ma.. U can always come Persona link to ask if u have any doubts.

As for the engine oil price, cheap doesn't necessarily mean it's bad.. Sometimes it's because they keep stock. And the european lube part is true, but applies mostly to supermarkets like Tesco.

Erm.. What I meant was Castrol Magnatec, etc that they sell at Tesco that are European stock..

Thanks. I'm flattered

Sunday mah. I also no time to check

Even my Cayman can run on Ron 95.

I believe Ron 97/95 is up to users' preference. If u wanna be economical, u'll definitely have to go Ron 95. Not much could be said about difference in engine performance; I won't believe it unless it is dyno proven that Ron 97 makes more power than 95.

P.s: talking about campro engines here and the application/difference between 95/97 on performance.

This post has been edited by xandras: Oct 30 2011, 06:09 PM

Have u tried different brands of petrol, then? Go pump Shell 97, then pump Caltex 97. U will definitely see the difference there. The problem is not with the Ron of the petrol itself, but rather the additives that they use in different petrol brands. It is recommended that CamPro engine uses Ron 97, but at the same time it is tuned to run with 95.

We members at PPLYN didnt waste our time & money trying different brands & Ron of petrol for no reason. AFAIK, campro engines run perfectly well on Caltex Ron 97. Arguably the best petrol u can use for ur CamPro. Very smooth, too.

If u think that higher CC cars won't feel the difference, then u're wrong. Cars with higher displacement are affected even more, and the difference is much more significant where knockings & power loss is greater felt. As I said, dyno proving is the only way to make me believe that Ron 97 is better than 95.

I'm not denying that Ron 97 gives smoother & better power delivery than 95, I'm just saying that if there is a performance difference felt in our CamPro engine, then it must be placebo effect. If u feel ur engine is smoother & less noisy while idling & accelerating, then yes, it is because of the additives in the higher priced Ron 97.

I can go further into how compression ratios and such affect the output of an engine using petrol of different octane ratings, but I think it should suffice that I stop here.

This post has been edited by xandras: Oct 30 2011, 06:40 PM

I didn't wanna get into the compression ratio discussion cos it is rather lengthy, but you've mentioned out a good point that prompted me to share a little bit on this topic.

2.0 Mitsu engine? By looking at our market in the past 10 years, not many cars came factory fitted with Mitsu's 2.0 petrol engine on the road. Either Proton Perdana, or Mitsubishi Airtrek (correct me if I'm wrong). And if it is indeed the Perdana with 4G63 l4, then the compression ratio is 9.0:1, which is rather low compared to our CamPro's 10:1. The lower the compression ratio is, the lower RON you can pump for the car to still run as usual. If it is the Perdana V6 with 6A12 engine, I'm not at all surprised that it ran without any problem as the compression ratio is the same as our CamPro, which is 10:1. Most CamPro users will tell you that their cars can run on RON 95 without any knocking issues (me being one of them), but a fair share of CamPro-ers also said that their engines are facing it. So probably you're one of the lot. But let me explain further to enlight you on this matter.

To understand what compression ratio is in the first place, imagine a piston in a cylinder while it is at the bottom of its' stroke. The volume of air in the space between the piston and the top end of the cylinder is 900 cubic centimetres, while the volume of air in the combustion chamber on top of the cylinder is 100 cubic centimetres. Total it up, you'll get 1000 cubic centimetres, or 1000 cc. When this piston moves up and reaches the end of the cylinder, the volume of air left in the combustion chamber is 100 cubic centimetres (piston moves up, reducing volume of air left in the cylinder until it reaches the top of the cylinder, and what's left is the air in the combustion chamber, which is 100 cc at all times). As such, the compression ratio is calculated as 1000 (total of 900cc in cylinder + 100cc in combustion chamber) to 100 (the volume in combustion chamber), or 1000:100. Primary school maths, fraction reduction and you'll get 10.0:1.

And then.. I'll have to get into the part how does an engine with high compression ratio works, but I rather get to the point right away as to why there is knocking in an engine when you use low RON petrol in a high compression engine.

In high compression engines, higher RON petrol is recommended for a more complete burning. When you're using a low RON petrol in a high compression engine, there might be chances that the fuel could not burn properly. Now picture a spark plug firing and the piston goes down and reach the bottom of the stroke. When it comes back up, there should not be any large volume of air left in the cylinder; there should only be air in the combustion chamber. But then, our cylinders may have imperfections on the surface, causing there to be small air pockets on top of the piston. Because of the heat and pressure from the incomplete fuel burning in the combustion chamber, these air pockets 'burn' and 'exploded', causing the knocking sound that you hear.

What causes knocking? Many reasons.

1. First of all as you mentioned, usage of low RON/octane fuel causes knocking in our high compression CamPro engines. Solution? Pump RON 97. But then our engines are tuned to run on lower RON as well to comply with manufacturing standards, and so that the export units may also run well at countries which does not offer petrol with RON higher than 95. So proceed to reason & solution #2 & #3 as this is less likely to be the issue here.

2. Second, your ECU may have been tuned to run too lean, which means there are more air than fuel in any single time during combustion. As I've mentioned just now, knocking happens when there are air in excess in the cylinder. If this is indeed your problem, a quick tune by the guys at CoSE to switch your air to fuel ratio (or AFR) to slightly richer (more fuel, slightly less air) will solve it.

3. Third, most, if not all of the cars that are manufactured today are tuned to run on low octanes (including our CamPro). And as such, these cars are often equipped with knock sensors to detect knocking in the cylinder. When knocking is detected, the ECU will retard the ignition timing to eliminate it. This is usually what is done to allow cars with high compression ratio to run on low RONs. It is less likely for the ECU or ignition timing to fail in this case (as you wouldn't be able to operate/start your car at all if it does), so the culprit here is a failed knock sensor.

If you're facing a very bad knocking issue with your car while running on 95 (which you shouldn't), then have the 2 items mentioned above checked (AFR and knock sensor). It is a must, as knocking may cause detrimental damage to the engine pistons, which in turn may require a engine rebuild at the end of the day. Unless, of course, you want to (and can afford to) run on 97 all the time.

I hope this clarifies thing a little bit for you.

This post has been edited by xandras: Oct 30 2011, 11:15 PM