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 Kia Optima GT 2017 at rm179k

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TitanRev
post Jul 24 2017, 11:13 AM

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QUOTE(jayraptor @ Jul 22 2017, 09:23 AM)
There is no chart that can show fixed turbocharged engine torque. Your first test vs 2nd, 3rd, 4th and so on will give you different reading especially on a car that is moving on the road. The wastegate valve opens at fixed rpm eg. Twinscroll turbocharger at 1200rpm, yes it'll open whenever reaching 1200rpm. The max torque however varies at no fixed rpm which is why turbo engine specs put 1200-4000rpm depends on situation. Any turbo engine specs chart that show flat peak torque from wastegate valve open rpm 1200-4000. If you read the chart as fixed peak torque, then you're not reading the chart correctly.
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Just want to correct your mistake. Wastegate don't rely on RPM to work it works based on boost pressure.
TitanRev
post Jul 24 2017, 10:40 PM

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QUOTE(jayraptor @ Jul 24 2017, 08:59 PM)
I just checked Google where you guys get source, none of them show anything about the plenum that works similar to VIS. I doubt you'll understand, better I downgrade further to your primitive level. You breathe and eat through your throat, how come food doesn't go into your lung? Because the epiglottis and glottis valves that will close the trachea when you swallow food, it goes into esophagus then into your stomach behind your big belly. Same case with turbo, at low rpm masuk bypass inlet, higher rpm masuk turbo inlet.
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Bro. Not to pick on you but again to correct your mistake. Turbo Inlet side only have 1 route which is through the compressor fin. There's no bypass on inlet side only on exhaust side. Inlet side you only have BOV or the BPV which functions when throttle is closed momentarily during shifting or throttle lift off. Other time it is closed or shut. When no boost the compressor fin will still turn but at a much lower speed. The compressor fin is driven by the impeller on the exhaust side so as engine RPM goes up the compressor speed gradually picks up and hence boost builds up gradually until it reach peak boost then the wastegate opens to maintain/hold the boost.

Just sharing from experience. No hard feelings
TitanRev
post Jul 25 2017, 09:14 AM

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QUOTE(jayraptor @ Jul 25 2017, 12:32 AM)
There are few types of turbochargers, even active electronic powered ones. Some just brought up VGT or the old single turbocharger to generalise all as the same. Twinscroll has 2 inlets, I talk about twinscroll, wkc5657 whose product has only VGT will think of something else.
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Jayraptor, twinscroll still has only 1 inlet on the compressor side. The twinscroll is referring to the impreller housing or exhaust side. Both exhaust inlet for the twinscroll still goes to the impeller fin.
TitanRev
post Jul 26 2017, 09:52 PM

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QUOTE(jayraptor @ Jul 26 2017, 09:44 AM)

As for modded cars, non of the modshop people are high level engineers equivalent to those in manufacturing cars. Like you for example, you replace original technical parts with custom mods (not from original lancer parts) that never really been through extreme R & D testing. The car will run but how often do you check under bonnet compared to those who stick to original stock cars in long term. How come you check far more than others? Because these mod parts are never perfect that even you don't trust they are safe. A car with serious leakage, noise, rattle, torque loss, suffer serious high FC, bad mixtute with black smoke can still run as long as you refill all the fluids that have leaked off.
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Ok I'm triggered on this part. Please... not all modify or performance parts you said are lousy or not safe or what ever it is. Some companies have spent a lot of RnD on developing performance parts and they also do real world testing with test cars ok. Please think why a good set of performance exhaust system can cost 5-6k and a good set of suspension can cost up to 10k. Companies like Ohlins, Brembo, HKS, Fujitsubo, AEM, Cusco, Whiteline..etc are not BS companies and have engineers of their own that is very much qualified.
TitanRev
post Jul 26 2017, 09:55 PM

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QUOTE(jayraptor @ Jul 26 2017, 06:41 PM)

For others, I'll advise them to keep a car stock and original. If modify also only change bumper, lights, rim, etc to high spec trim or new facelift is ok. Else, save money better. Later on can buy new better car. If mod car like you, after 10 years also still stuck with old junk that is suffering from serious wear and tear compared to stock model of same year.
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Please don't talk like that..my FD2R and WRX is still rocking even after modded. How? I also have a heavily modded saga that I use for time attack/ track days and still can daily drive..no issue also

This post has been edited by TitanRev: Jul 26 2017, 10:26 PM
TitanRev
post Jul 26 2017, 09:57 PM

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QUOTE(jayraptor @ Jul 26 2017, 07:39 PM)
Regarding stupid mods, if that Ah Beng is not the type that always check engine bay or listen to noise for anything wrong, most likely he'll end up car stalled by roadside. For you, you always check sure will quickly go workshop or buy parts if anything wrong. Compared to owner with stock inspira, how much have you spent on maintenance? You spend more time checking engine and fixing?
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So you are calling all car modders ah beng now??
TitanRev
post Jul 28 2017, 02:15 PM

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QUOTE(jayraptor @ Jul 28 2017, 12:07 AM)
Correction to your comment, not everyone think of resale value and FC at first but they only feel pain when terhantuk hit their head on these 2 factors. Monthly petrol price, others with quality original parts fill up full tank twice a month, you fill up every week. Resale value, when comes to selling cars, others selling at market value, you have to keep slashing price because of no buyers.

The modding part, they feel excited and happy at first but later realised the car lost low end torque. Last time shift to D or reverse, the car already start moving move. After modding, need to press pedal only start moving. You remove catalytic converter and exhaust muffler with pipe kosong and DIY short straight muffler, pollution NOx makes your parents and in law, org tua cough and sneeze, deafening noisy to their ears too. Ferry whole family, the car suffers more at low end torque requiring you to floor pedal more, minyak also burn more.

All these like happy first then suffer and regret big time.

My VVT knowledge comes from technical experts, training and recognised engineering guide books. As opposed to your DIY trial and error with Ah Beng source. Which is why you still failed to tell Lancer GT and GL chassis code, really pity you. The service manual that you kept bragging about, you got it from your aunt who bought lancer GL, pinjam to scan or photostat
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Eh boy, your brain got problem? Or you thinking with your kukubird? You have issues with people who mod their cars? What with calling people ah beng here and there har? So people who work in those established tuning company and brands are ah bengs to you also la if according to what you say.


TitanRev
post Jul 28 2017, 04:59 PM

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QUOTE(wkc5657 @ Jul 28 2017, 02:24 PM)
You sure want to have a leg in this party har  blink.gif
He has close to 40 years of "industry experience" and vast "insider knowledge" pool and "contacts", he should be approaching 60 years old, he is no more a mere boy. Calling him a boy is such an insult to his built up pedigree!

He believes religiously to that particular "toyota engineer", which given him the research findings of timing belt slipping causing VVT not efficient. All else is fairytale, like what he always labelled me!

Faham?!  rolleyes.gif
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nonetheless he still talks like a boy.

QUOTE(K3nnYkl82 @ Jul 28 2017, 03:36 PM)
this one he also already answer..

U will regret later .. after mod , engine leak .. always need to check engine .
then ur Resale value drop
FC no good ..
the car create a Lot of NOx and ur parents have to smell it during the journey ..

whistling.gif
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Then he should ask all tuning arm and companie like TRD, AMG, Gazoo Racing, STI..all kasi bungkus coz makes car leak like no tomorrow.
TitanRev
post Aug 9 2017, 08:18 PM

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All the turbo talk...I takda turbo car also...drive NA saja and some more old car.

Pening with Dr.Jay long posting also.

This post has been edited by TitanRev: Aug 9 2017, 08:21 PM
TitanRev
post Aug 10 2017, 02:56 PM

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Correct me if I'm wrong VGT is mostly applied on Diesel engine as diesel engines have a very narrow powerband or usable rev range so a VGT is to improve and give the diesel engine a wider usable powerband.

Dr.Jay Please try to learn how to accept other people's opinion and comments or try to listen to what people have to say and not always thinking people try to belittle you. Not everything you say is 100% correct right? I mean we are not god, we just human.
TitanRev
post Aug 14 2017, 11:40 AM

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QUOTE(jayraptor @ Aug 12 2017, 10:07 AM)
VGT mostly in diesel engine mainly because its design is more simple. Diesel engine has far more carbon buildup so it need s more simple straightforward approach to avoid high carbon buildup and difficulty in cleaning.

When popularity of stock cars with turbocharger came, there's already twinscroll turbocharger available. So they went for twinscroll turbo.
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I have to disagree on VGT being more simple. If got chance, you try open up 1 and see. Twin scroll is far more simpler as the changes is the exhaust housing design which is easily can be removed and installed back compare to VGT.

And as what the others had shared VGT is very sensitive to heat, especially the vanes.
http://www.enginebuildermag.com/2014/07/te...-turbochargers/

Most petrol engine use twin scroll as it is a much simpler system and more reliable.

Hope this corrects some of your misunderstanding.

TitanRev
post Aug 16 2017, 12:59 PM

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QUOTE(jayraptor @ Aug 15 2017, 10:34 PM)
The detailed facts version wastegate function explanation puts most of you quiet because it is correct and shamed few of you who actually didn't know wastegate valve complete functions.

The VGT actuator is not in the exhaust manifold side but only at the other end of the impeller. All it does is only extend or retract the blades or fins for high or low exhaust pressure operation. The VGT turbocharger cleaning mostly on exhaust manifold and impeller, cleaning is easier and less prone to carbon buildup. Your comments clearly tells that you've never seen how people clean up carbon buildup especially diesel engines. Lol, you sure think brushing only. You should check how complex the twinscroll exhaust turbocharger and its exhaust manifold first.
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Doesn't matter if the actuator is on compressor side. Heat will travel and it will heat up the actuator for sure. Twinscroll is really not complex. It's just the a different exhaust housing design compare to the vanes on the VGT.
TitanRev
post Aug 16 2017, 01:08 PM

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QUOTE(jayraptor @ Aug 15 2017, 10:51 PM)
I'm not surprised at all that you failed to complete the half details I posted on twinscroll turbo. So are the few of your buddies here except they backed off upon seeing the details. You're probably the weakest amongst them. Kesian, let me sedekah you the other part.

As told you, there are 2 inlet where 1 for low pressure and 1 for high pressure that goes into impeller. The exhaust manifold ports for 2 cylinder chambers that start first linked as low pressure manifold that goes into lower pressure inlet. The 2 more chambers exhaust linked into high pressure inlet. These 2 inlets called as twinscroll that flow low and high exhaust gas pressure to impeller allowing it to spin the compressor fast enough to effectively draw in dense air into combustion chamber. That's twinscroll turbo could assist from as low as 1200rpm in some configuration layout.

So you still want to talk fairytale?

@constant_weight replying to you too
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Its not low pressure or high pressure. It's firing order, exhaust pulse.

QUOTE(jayraptor @ Aug 15 2017, 11:13 PM)
Whereas modshop like Kenny and Preve turbo, these are examples of failures.
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Please design and manufacturer an engine from your knowledge and let me see if it's better than Preve turbo.
TitanRev
post Aug 17 2017, 01:56 PM

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QUOTE(jayraptor @ Aug 16 2017, 10:59 PM)
Lol, heat will travel. You never seen that actuator before nor knowing how this thing function? Actuator only push the blade housing in or out to allow exhaust gas pressure to flow and blow the impeller effectively. Still it has more room than twinscroll layout on the exhaust side which makes it ideal for diesel engine.

That heat thingy must be from some guy that felt VGT threaten his product sales so made up this story. TCU, ECU also electronic, does he say heat travel because they operate at all time compared to VGT actuator that only operates when required.
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Dude, you no study science class ah? Metal or metallic object can conduct heat. For the blade to move it is controlled by actuator so the blade is in the path of the exhaust. exhaust is hot the blade is metallic heat gets conducted to the blade and to the actuator. You try holding a metal road at 1 end then 1 end u put it over a heat source...overtime the end you holding will be hot also. Thats why people say VGT is not suitable for petrol due to higher heat that would affect reliability.

Please explain how the actuator push the blade to open and close if there's no connection between the blade and the actuator. Wastegate actuator you see before?

 

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