Area 51 Supercharger for MP3

[trobbins]

Instead of comparing RPM, you really should be comparing piston speed. If you think about it, the piston travels up and down for every revolution of the crankshaft. So the piston speed depends on the stroke of the cylinder.

for the sake of argument, lets say an I4 engine has a stroke of 4 inches, and a V8 has a stroke of 6 inches (These are made up numbers). For 1 rev, the I4 engine travels 8 inches, the V8 travels 12. So at 4000 RPM the I4 piston has traveled 16000 inches in 1 minute, the V8 has traveled 24000. So for any give RPM the V8 will have 1.5 times fast travel time (remember these numbers are made up, but the idea is the same). On the other hand a motorcycle may have a stroke of 2 inches, which will allow the Redline to be roughly twice that of the I4 while still maintaining the same piston speed.


In actuality, the pistons of most cars are traveling at roughly the same speed. Of course, there are exceptions. Honda's usually have a higher piston speed than other cars. Some, like the RSX, have near indy car piston speeds. Ferrari's have a shorter stroke with more cylinders, which allow higher RPMs.

Tim

 

[APEXistud]

I think our car are high revving engines, cause if you take a look at the cavalier and sunfire 4-cyclinder engines they only rev to like 5500-6200rpms also the VW jetta's rev at 6500rpms. so technically i could say our little 2.0litre engines rev pretty high, also it can go to 7000rpms where the fuel cut off is at. I say that's pretty damm Decent. And the redline on a 92-95 Civic EX is at 7200rpms and fuel cut off is at 7500rpms so i don't know how u got it there, and i ain't saying i don't believe you but just wondering how you got there.

Dinan Stg2 ECU my friend, kinda rare. I think Dinan ventured off to test other markets for a couple of years back then. During that time, they made Acura & Honda chips. Call it :bs: if you want, but I still have pics of the ECU and chip for those who would like to see it.

 

[jonlisle20]

All I know is that my neighbor (the rich bastard), took me for a ride in his supercharged s2000 and it hauls ass!! He has the Comptech centrifical supercharger setup. There may be downsides to a centrifical charger on a high reving, low torque, four banger...............but I couldn't remember them after my head slammed into the back of the seat after each shift! In this case the charger setup worked wonders.

 

[tritonheat1]

Dinan Stg2 ECU my friend, kinda rare. I think Dinan ventured off to test other markets for a couple of years back then. During that time, they made Acura & Honda chips. Call it :bs: if you want, but I still have pics of the ECU and chip for those who would like to see it.

Ohh nooo....... i believe you, that's why i asked how you got there. Supposely if you know if those chips provide more acceleration, speed, hp, and Gas???????

 

[70]

That's not accurate. If your car already doesn't have any low rpm torque, why would you put something on it that is going to take even more lowend torque away. It takes engine power to turn that pulley. A turbo is using energy that is being wasted anyway. That's why lots of V8's use superchargers instead of turbos, they have plenty of torque to spare.

Um, a roots type blower is making boost at idle...Enough boost to offset any drain it might have on the crank. And if I remember correctly, the Jackson Racing SC kits drain the motor about the same as an A/C compressor, only it is also making boost at that time. A roots type blower is all about putting more torque down low.

Centrifugal blowers are more like turbos in that they make boost higher up in the rpm range.

 

[slowyellowp5]

Um, a roots type blower is making boost at idle...Enough boost to offset any drain it might have on the crank. And if I remember correctly, the Jackson Racing SC kits drain the motor about the same as an A/C compressor, only it is also making boost at that time. A roots type blower is all about putting more torque down low.

Centrifugal blowers are more like turbos in that they make boost higher up in the rpm range.

Well...yep.

 

[70]

Yep...