Force Induction : Any Options for 4AGs?

[synchron]

Bigger pulley doesnt make the engine slower. It is also depending on the weight of the pulley. Stock s/c pulley is about 2.5 kg. Aftermarket ones now adays is less than 2kg. Alluminium ones will be less 1.5kg.

 

[turbo10]

colder air = higher power output..rite?u'll get a slight boost drop in the i/c piping + i/c itself but u'll run a colder mixture and it will reduce the chance of detonation and u also can run a little bit of advanced ignition timing and a bit leaner air/fuel ratio.combine that 3 gains i think we can forget about the slight boost lost by the intercooler and gain much more....just my 1 sen..please correct if i'm wrong.thanx.

 

[synchron]

Centrifugal s/c are different from turbo. Air blown in from turbo are much hotter than the one having from the centrifugal s/c.

One is exhaust gas driven and the other is belt driven. As i said before efficiency of a turbo is about 50% and a centrifugal s/c is about 75%.

Even a roots charger cam be run without an intercooler on low boost. It will be ok if your are running on low compression pistons and good fuelling.

 

[-e f i n i-]

but then.... a turbocharger still proves to be superior at the end of the day right, despite the inefficiency you stated... im not sure too, but many sources i've read from convinces people that supercharger is inferior compared to turbocharger because of the power lost used to work the blower...
Hmm...
I dunno, but maybe the response still proves to be a deciding factor in certain applications?

 

[synchron]

Ultimate performance is till s/c but the turbo are so much cheaper to get so many ppl prefer turbo rather than s/c.

As i said before, like weight engine like ours can use big roots blower. It will take out of hp before it starts to work.

 

[-e f i n i-]

I dont understand really,
Are centrifugal chargers better than roots? How come Top Fuellers use roots? I thought centrifugal chargers can take higher boost applications?

 

[sprinter cielo]

Upgrade Supercharger

Aku Ader I Question.camner Upgrade Supercharger Selain Dr Tmbh Turbo.aku Punya Top Speed Now Br 240km/j Maer Tau U All Ader Idea .bole Tlg Sama Aku.if Aku Ltk Intercooler Kat Bah Bumper Adakh Ia Akn Hlgkn Pick Up Or Power

 

[synchron]

Top fueler want quick and fast respond, their car is modded that way.
For example the toyota dragster already got 8000++cc. They are using screw type s/c making more than 45 psi of boost. Special fueling system, others i m not sure.

 

[-e f i n i-]

Hmm... may i know if screw type is the best compared to roots and centrifugal?
max boost level is affected by the pulley too right? hmm.. but superchargers straight from manufacturers... what makes the max boost vary among other sc units? A/F ratio?
so the point is, if we get a super huge pulley, the boost can be set even higher?
lets say we get an ordinary SC, if on the paper it says max boost is 20psi, but if we crank it up to 45psi, how big would the efficiency issue be? blower blow up?

i read somewhere they recommend using roots and screw for extreme drag/strip, but centrifugal for street/stip...hmmmmm

can we swap the supercharger impeller for a better one? i mean more durable and lightweight + heat resistant? but are there any in the market? how if we port and polish the centrifugal or screw SC units? will the reliability of it be jeopardized? i only know P&P is a common practice among turbo users, but SCs... never heard of it.

sorry, gonna do more research tonite and hopefully i dont have to bother youw ith stupid questions again... but i'll have to get some nice sleep first.. been sleeping at 2am for the past 2 days just to cram my subjects lol.

 

[synchron]

Screw s/c is a better and more advance version of roots charger. It can produce much faster and more boost.

If the s/c is rated at 20 psi and you want to make 45 psi then most the first thing that goes first is the bearing and gear inside the chargers. You will need to spin at a greater speed in order to get this type of boost.

For example if the screw charger max RPM is 18000 and it will produce max 20 psi. If you want 45 psi then you need to spin the s/c more than 18000 RPM. The parts inside the charger may only last max up to 18000-20000 rpm. After that everything will start to tear apart.

Yes! you are partly correct on the usage of s/c. It is all depends on your engine built up. For engine which is less 2.5 litter and has high rpm, it will favour to use centrifugal supercharger. The engine is light weight and it will easily spool up the charger.

What do you want to do with your car actually?? street, drag, circuit or what?? What type of hp are you looking for? What is your budget?

Never tried swapping impeller or even pnp a s/c before. No info on it.

 

[-e f i n i-]

So...
The internals of the SC can be changed here and there? i see.
So the lighter and the higher the cc of the engine, the better.. tht i know.. but is it that, lighter engines = lighter moving parts... so lighter parts like crankshaft can spin with ease then it would also be easier to spin the SC too?
I mean, because there is less load on the crankshaft.. so movement is also easier..

Well, I dont have a car yet nor do i have a permit to drive legally... All these are for knowledge and hopefully i can carry out a project after SPM.. i will be working my ass off then to afford my own car and mods.
Targetting around 250-300hp(preferably on wheels) for drifting. Bah... too young to think of this huh?

 

[synchron]

Internals of the screw and roots types cannot be change. They are fixed.

Get about RM 10000.00 to 20000.00 rdy if you want to mod s/c.

Budget wise go for turbo.

 

[-e f i n i-]

Ack...
That means no more S/C for me....
But its okay though... this thread is still good to me for knowledge ;)

Hmm... so, internals for centrifugals can be changed? Is it possible to do a complete re-vamp on a centrifugal and hence making it more powerful than screw?

 

[synchron]

U cant say that it is more powerful screw. Cant really compare the products.

Respond of centrifugal is fast, but it will still loose to screw s/c. No way about it. It is a fact.

 

[-e f i n i-]

Eh... would sequential(with the smaller sized turbo working first, then the bigger one) twins work on a 1.6L 4cyl 4AG without killing it?

 

[synchron]

Dont get what you mean? Any way i am not a turbo guy.

Sorry cant help you with turbo stuff.

 

[-e f i n i-]

Hahaha.. its alright... i dont think twins work great on 4cyls too...

 

[synchron]

U mean like rx7 type. One small turbo then to another big turbo. I heard there will be turbo lag in this system.

 

[-e f i n i-]

but i thought it kinda minimizes it right? since big turbines can only spin when the optimum amount of air is passing through the impeller.. so we can use the smaller one to spin first... then when engine speed reaches like uhmm.. 5K rpm, the smaller one goes off to give way for the bigger one.
but nah.. prolly seq-TT wont work well on 1.6L..

 

[rollakid]

even on a supra, 3liter inline6 engine, the stock sequential turbo that come with it also very complicated, i heard got ppl got fed up of it (in some other forum) and switch to 1 big single BB turbine or just two smaller ones.