I'm writing with the assumption you've done a full overhaul, not a top-overhaul.

The engine needs to be run in a little before you see any significant difference. I presume the mechanic had advised you to hold you foot for the 1st 1000KM or so, and send the car back for an engine oil change after that? If not, please do so. After that, the engine should begin to perform at it's peak. Usually, the mechanic would use cheaper oil for the 1st 1000KM and then switch to semi/fully synthetic. THEN you can see the difference

Until the, just bear with it. If you've done the 1000KM service & adjustments and STILL have bad FC, you might need to consider a carburettor service and some PROPER tuning (AFR, timing, compression, the works).

BTW, I drive an '88 Saga powered by a 1.5 Megavalve So I feel your pain too bro...

This is what I was told !
I never rev beyond 3k rpm since overhaul. Now only clocked 500++ km nia.
Btw, I am also quite concerned with the feasibility of putting 15w-40 in my Corolla XL (1986).

as the title says, yes it is a full overhaul

my engine is already 1.5k km post overhaul. in fact, i asked the mechanic do i have to go light on the foot, keep below 3k rpm and so on. he said no need, in fact cars are built to run, regardless of new/overhaul, which i strongly agree along since you know, it would be quite suffering to me if i had to go light under 3k rpm all the while especially i have a penang trip within that 1k km period.

during the penang trip also, i was going some ~4k rpm, 110-130km/h speeds. not engine noise is kinda high pitched, probably cuz of the lack of tuning and using mineral oil post overhaul. FC is obviously still in the gutter, didnt really recover that much (seems like it did, though very minimal differences)

post penang trip (~1.2-1.3k ady, overshot the 1k >_<) , did some carb tuning, distributor tuning and perhaps some other minor tunings i may not have noticed, poured in lube guard platinum for my ATF, and using liqui moly semi syn. performance is leaps and bounds beyond what i've experienced. just that its still a little early to gauge on FC. and again, with my foot getting heavier thanks to the added exhilaration from that smooth revving, and acceleration, im not really expecting much lol. just being realistic here ^^;

of course, it depends on how bad the FC is. the mechanic also tell me to come back again if the FC is still bad so he may check on the carbs. (previously he said the carb is still in good condition, probably thanks to the clean outlook from the 3bond throttle cleaning and what not ^^

Carburetor was cleaned??
For Carb., add the air leak device for more power and better FC.....

i would assume they didnt clean the carb since they mentioned that they didnt do anything to it

and mind elaborating on this "air leak device"?

You may want to clean the carb., since it is pretty long ago...

Air leak device is like the surbo unit, but not all cars will benefit from it. Will be good if car is a guzzler, like my wife's Sonata III. Even though fuel injected, have to by pass the air flow sensor to cheat the ECU. I am getting better power and better FC.
For carb., so far we found it worked well in the Iswara. Connection is between PCV valve and inlet manifold, T joint and air flow controlled by another device.
There are also the air compressor thing but don't joint to vacuum hose of brake servo, which many people do....

surbo? or it was typo'd from turbo?
personally im not too keen on modding the car. kinda want to keep it stock until i can change my car ^^;

unless of course theres further information for me to read up, most importantly it is proven to improve performance/FC, and without side effects/drawbacks etc.

Yes, it is surbo, I think is the brand name. Same as some other air leak device as they called it.
Mine was DIY with my mechanic. Did in 2008....Read about it here....
http://forum.autoworld.com.my/index.php?showtopic=3788

still need rm150 or so? (from what i read on the thread) or now maybe in the 200's?

this year my finance are totally tied up thanks to the overhaul. so want to do also, maybe next year >_<

Price I think not much difference.
Anyway, just share info only.....

no prob, thanks for the info sharing

foo yoh
time for iswara overhaul since 2000
that's so long ago ...

My 1996 car still running fine....

lol after overhaul, performance really nice, just having some troubles on the top end, as i guess exhaust pipes all clogged up with 11-12 years of carbon? lol

only manage to top around 150-155km/h with everything still stock

and oops, just reminded me i havent posted pictures LOL

Off the air con when testing high speed......

that kinda speed is more than enough for my fully stock car, in terms of safety, 150 for a stock iswara is quite dangerous already, unless i change to 15" rims with better tires ^^;

i thought iswara highway cruising speed is 150kmh??..
that one is top speed already ah??...

if you mod your engine, or think that flooring the car as cruising, sure lol

my car stock standard only mar

Just mentioning off the air con you have better power and also less strain on the air con compressor.....