vroooom ptssssh

Someone mentioned they saw it on ebay the other day. .

What would be the benefits/losses to supercharging a cosworth?

would the power be the same with the same boost level etc?

petermintrst

i think it would be great. no lag with a charger. i think more power can be extracted from turbo cars though.

Jay,

iTrader: (4)

what about both like the super charger to get rid of lag?


jay

Stavros

due to the ways chargers work, you could well have far more midrange power from a turbo.

its a complex thing that i can be arsed to type right now

petermintrst

just do what vw did with the new golf 1.4!

Jay,

iTrader: (4)

but y not man come the fuck on lol

jay

petermintrst

come the fuck on what?. sorry have i missed something

vroooom ptssssh

petermintrst, i think jaycos meant that to Itsmeagain

come on steve, get typing

PaulCossie

You get a straight revs/pressure delivery from a supercharger therefore the boost is constant to the revs.

Turbos are far more efficient imo, with a Turbo the boost is an exponential delivery meaning the boost will keep increasing exponentialy until the whole thing explodes (hence why an actuator is needed). Turbos also have far less moving parts making them more reliable.

There are thousands of aspects to supercharges versus Turbos… but I’d always stick with a turbo….

neilm

I actually saw the Supercharged Cossie in the flesh, before it went on Flea-Bay.

Talking to the guy he said it went really well from 1500rpm and wiped the floor with his brothers Stage I Saph.

It was just a shame he knew very little about the conversion

I dont know what happened to the car as he started the e-bay auction at Ł4,000 seemed to attract a load of muppets and then it went to Ł10,000 so I dont know if anyone actually bought it in the end.

Personally, I love supercharging and find the whole power delivery thing a lot smoother.

Plus the whine....

Stavros

You reckon? Less parts and grief with a charger, hell, on a traditional Rootes type you dont even need an oil supply.

Oh, the thing about to turbos will keep inreasing in peressure until it goes bang isnt strictly true, depends how big the turbo your using.
Even T34s on decent spec cossies cant hold 30psi at high rpm even with the wastegate welded shut due to the engine being capable of consuming more than the turbo can give it.
Same with a charger, run a huge charger on a lil engine and gear it right and itd create immense boost, but put one too small and the boost would be low no matter how hard you span it.

The twin charging idea is brilliant for a smallish capacity engine if you got the room for it all, obv just running decent ALS all the time would be just as good, but not exactly engine or police friendly, lol...

One serious issue you have with chargers if you running them hard is premature and uneven crank/bearing wear as chargers drive belt is off one end of the crank and it takes a fair amount of force to turn a charger.

Even though chargers are more commonly associated with big V8s, IMO they the engines where they totally pointless as with the big capacity you got the ability of spinning up big turbos from nothing anyhow.
The mustang guys etc in USA have realised that now, that turbos give them more performance, reliability, and even drivability.

But superchargers can make small engines lovely to drive, as they dont always have the ability to give you the low down responce you might want.

Dan

IIRC you can't run much boost on a supercharger compared to a Turbo, don't they start warming the air once they get to/past a certain psi?

turbo_3dr_tommy

http://www.durhamrsoc.co.uk/index2.html

Sorry dont know to pu up pics

Stavros

Dan?

Turbos heat the air FAR more than a charger will mate. They both do tho, hence the point of intercoolers etc.

Turbo outlet temps are usually well over 100degC, burn your face off style temps, lol...

PaulCossie

itsmeagain, your are quite correct... what i meant is a turbo will keep going until its only restriction is the amount of air it will flow (depending on its size)

The fact still remains that more initial power is needed to drive a supercharger making them less efficient.

as for power delivery, its down to personal taste... i much prefer the kick that a turbo gives and you get used to driving it in the power band if you need the power straight away.

Dan

lol Think the Mini boys have switched to using Turbo's for that reason tho, because of the room in the bay for the cooling?

Not quite sure, heard it second hand and can't explain it how I want to! lol

zippyobrien

iTrader: (2)

what about runing a super charger and a small turbo? just have both feeding into the same inter cooler. could run both at 10psi and have a combined boost of 20psi (does it work that way, i mean just adding 10 + 1- psi?)

there s a 1.9 mk1 fiesta with this set up, makes massive power for a cvh (well into the 300bhp)

Mike Rainbird

iTrader: (3)

Apparently Ahmed mapped that one that was on ebay, and he thought it NO quicker than a well set up stage 1 car....

Mark V8

iTrader: (2)

The Lysholm screw superchargers are so efficient they were banned from top fuel drag racing and put a very small amount of heat into the inlet charge, Keene Bell do conversions with this type of blower

http://videos.streetfire.net/Player....ene%20bell&p=0


Mark

Jay,

iTrader: (4)

yeh mate soz it was ment at steve to give us a quote and he has


jay

OLDSKOOLZACH

my old mans got a supercharged 911 sprint car its an animal but superchargers do use power from the engine to run them i myself would perfer a turbo car on als, they both have benifits its a hard one wooooooooooshhh from ur turbo spolling up or wine from a supercharger .

Mark V8

iTrader: (2)

Blowers do use power from the crank to run, but how much power is wasted trying to force all your exhaust gas through a rusty snail ?

Mark

Stavros

that was gonna be my next point, people dont seem to remember/think/know about the huge backpressure caused by turbine housings

foreigneRS

and it's not so much the supercharger or turbocharger that makes the compressed air hot, it's the compression of the air. just feel the end of a bike pump when you've pumped a tyre up