Some questions about supercharge and LSD

[1zzfe]

Hi... i never have a 100% correct answer with those two thing...
what exactly are they and how they work...

i know superchage is like turbo... but is different.. but how... and is it better or not... do we need to change all the piston to have a superchagre..

and LSD.. i know if you have that it'll help on handling.. but again.. how and why..

thank you

[F22-Raptor]

Ok First the Supercharger gets air differently than a turbocharger. The supercharger has a pulley on one end that goes to your accessory belt. This belt drives the screws inside to force out air. This air in turn goes into your intake. The efficiency of how much air a supercharger can put out reliably is usually about 40-45 % so you can usually get about a 40% increase of power reliably.A turbocharger works off of your exhaust gasses and sits down under your exhaust manifold. The exhaust gasses that come out of your engine turn the splines on a turbo. Then that air goes into an intercooler to cool the exhaust gasses back down and then goes into your intake. Turbo Chargers are about 70-85% percent efficient. About your pistons...If you run enough boost on either you will need to change your pistons. If you are only running 0-9 psi most of the time you will not need to change any internals. A limited Slip gives you more traction by allowing the outer wheel to slip and engage instead of simply going along for the ride. Basically for example when you are turning around a corner, the inside wheel is the only wheel that is pulling. With a limited slip it allows the outside wheel to pull weight as well. Not completely how it works but a small understanding that I could type fast.

[NoCones]

have to disagree on the LSD...

an LSD essentially routes power to the tire that has traction...typically the outside one. with the oem open differential, if you try to accelerate too fast out of a tight corner, the inside wheel will spin. with an LSD the power formerly wasted on the inside is routed to the outside...

[GTS LAID]

yes what nocones said is correct... if you try to imagine yourself making a sharp left hand turn you notice the weight shift to the OUTSIDE tires... which means these tires get plenty of traction... the inside ones however are slightly lifted as the wieght transfer is shifting the force of the car off these inside tires.. this leads to wheelspin if you keep applying the same amt of power (as in an open diff.) an LSD acts to keep the power going to the outside tire while slightly chilling out on the inside one... I posted a scan of an article about how LSDs work last week so check that out ... its somewhere around in there.

[TRD StreetRacing]

GTS LAID........is it in this forum or another?:confused: and what are the types of LSD's are there? and what is the pro's and con's about each one? NE info will be helpful

[1zzfe]

Thank you for all your reply.. i'm getting more clear about those 2 things now.. hehe... maybe is time to get a TRD LSD.. hehee

[GTS LAID]

heres the article i posted a week ago:
http://newcelica.angrypacket.com/forums/showthread.php?s=&threadid=15513&highlight=quaife

[caz]

Alright... then can someone explain the difference between Helical and Clutch type LSD?

[GTS LAID]

that i cant do.. but just looking at that pic of the helica gears makes me drewl for one.

[Da Kine Guy]

LSD also lets you do two wheel burn-outs :D

[chameleon]

I'm sorry, but I have to dissagree somewhat with the explination of the supercharger/turbo charger. The description I read above made them sound like completely different units, which is not true. In fact, there is only one difference between a supercharger and a turbo charger. The difference is that a supercharger compresser is driven by a belt/pully that your engine turns and a turbo charger is driven by exhuast fumes. So the description I read was right about that, but it made it seem like they were different in other ways, and they really arn't.

The operation of the compressors themselves are exactly the same, and the power outputs they can reliably achieve are also the same. You can hook up all the same kinds of stuff to a supercharger that you do to a turbo charger such as blow off valves, intercoolers, ect. The only reason that superchargers don't come with that kind of stuff is because since they run off the engine they manage themselves better than a turbo due to the fact that a supercharger's output changes as the engine speed changes. A turbo needs a lot more to keep it from overboosting and blowing your engine because it is running off your exhaust. You NEED that stuff to keep everything under control.

Also, a lot of peeps think that intercoolers are just part of a turbocharger and all turbo charged cars have them. This is not true. Some factory cars with turbo chargers do not have intercoolers, and some aftermarket turbo add on systems do not include an intercooler. The reason that so many do have intercoolers is because since the compressor is running off hot exhaust fumes an intercooler is needed to prevent pre-ignition inside the car. When people start messing with the boost on their factory turbo charged cars, intercooler upgrades are often done to prevent pre-ignition. If you adjust the boost high on a supercharged car, it will need an intercooler as well. Since our cars have really high compression engines, an intercooler will be needed with both, a supercharger or a turbo charger. The blitz supercharger for the 2zz-ge Celica comes with an intercooler.

The difference between the Helical and the Clutch type LSD's is that the Helical type operates off friction from fluids and the Clutch type operates off of friction from clutches. With a clutch type LSD, if one wheel starts to spin faster than the other, it must first overpower the clutch. The friction of the clutch determines how much torque it takes to overpower it. So if you want to have a more/less aggressive limited slipping action you can add/remove clutches inside the LSD. This is advantageous if your car is a race car, because you can make adjustments to it accordingly to optimize its performance for a particluar track. The Helical type LSD cannot be adjusted, it has a fixed amount of limited slip action. The advantage to the Helical type is that it will last forever with no change to its limited slipping action, it will work just as good after 5 years of track racing as the day it was bought. The disadvantage to the clutch type is that the clutches inside it wear out just like a clutch inside your transmition, diminishing it's limited slipping action and requireing replacement(every time you make a turn, the clutches will engage and wear a little). Also, the only way to make an adjustment to or replace the worn clutches inside the clutch type LSD is to completely remove the transmtion from the car, split the transmition open and dissasemble it. This diminishes the one advantage that the clutch type LSD has(it's adjustability) because people buying it for their street car are probably not going to want to have to pay to have their transmition pulled out of their car, split open, and be re-installed just because they are going to the track that weekend.