Rotrex Supercharger Thoughts?

[diegom6]

Desing, hmm I wouldn't say that at all...see the size of the compressor wheel in the S/C and compare it to a mid size turbo wich you will notice is smaller, yet will make more power and torque... S/C is for ladies IMO. I own both systems and I know what I say.

c ya!:D

[BimmerToad]

I think it would be safe to say a centrifugal S/C is a turbo on a shaft, since they share the same centrifugal compressor turbine/housing/design. While a turbo produces more power from sapping energy off of the exhaust as opposed to the engine, both compressor designs generate pressure in a non-linear rate.

And as for S/Cs being for ladies *shrug*

[Insanity]

Superchargers aren't for "ladies", they're for people who understand that maximum power is only important in drag racing.

[diegom6]

Er... you misunderstood what I was saying. Roots and twin screw superchargers are very different from turbochargers. About the only similarity is that they are both spinny things that force air into the engine.

However, a centrifugal supercharger is literally a turbo with a belt that drives it instead of the exhaust turbine:

Lol, I know what is a Root S/C (Eaton, etc) and Centrifugal S/C , (Vrotech Powerdyne, Procharger, pAxton, etc....) what I was refering was the centrifugal S/C, that actually looks like a turbo but is just belt drived but there is no way it can be compared to a turbo in the powerband curve. I didn't missundertand what you say.

I have a Roots S/C ans centrifugal S/C and Turbo in my hand...I know actually what they are ;) Also I have installed a Twins Screw.

Here is a shot of my Jeep witht he centrifugal Powerdyne S/C..... I would turbo my Jeep enevtually. S/C are made for ladies.....(I guess I?m a lady hte Jeep side by now) and Turbo for serious entushiast of the power.

[Insanity]

I wouldn't say at all a S/C are just a belt-driven turbos....sure the principle is the same except belt driven...but again, power band it's another story int he turbo side :pimp:

Er... you misunderstood what I was saying. Roots and twin screw superchargers are very different from turbochargers. About the only similarity is that they are both spinny things that force air into the engine.

However, a centrifugal supercharger is literally a turbo with a belt that drives it instead of the exhaust turbine:

[diegom6]

Roots superchargers are actually the best for the low end, twin screws are a very good compromise of high and low, and centrifugal supercharges are just a belt-driven turbo.

I wouldn't say at all a S/C are just a belt-driven turbos....sure the principle is the same except belt driven...but again, power band it's another story int he turbo side :pimp:

[Insanity]

byt he way, I forgot to mention. Twin Screw has the fastest throttle response or boost build repsonse, but the con of it, is at high RPM's always lose boost or start to decrease some PSI's......

Roots superchargers are actually the best for the low end, twin screws are a very good compromise of high and low, and centrifugal supercharges are just a belt-driven turbo.

[diegom6]

Right, just like mitsubishi claims the EVO has no lag (yet in each successive generation, they claim to have solved the "lag problem). Also, I'm not talking about drag racing, I'm talking on throttle/off throttle. The response is not only extremely unlinear with RPM (as a centrifugal supercharger), it's also extremely unlinear as compared to throttle position, whereas NO type of supercharger is non linear as compared to throttle position.



Yes, it quite possibly has a better power curve as compared to RPM(since dinan uses a centrifugal SC), but not throttle position. Turbos never do.

byt he way, I forgot to mention. Twin Screw has the fastest throttle response or boost build repsonse, but the con of it, is at high RPM's always lose boost or start to decrease some PSI's......

[Insanity]

That's why I quoted "response" , yes a S/C will response or make boost earlier....but a if you want a fast spool and no virtual lag, you have to choice a properly saized turbo and must be BB system.

Right, just like mitsubishi claims the EVO has no lag (yet in each successive generation, they claim to have solved the "lag problem). Also, I'm not talking about drag racing, I'm talking on throttle/off throttle. The response is not only extremely unlinear with RPM (as a centrifugal supercharger), it's also extremely unlinear as compared to throttle position, whereas NO type of supercharger is non linear as compared to throttle position.

It's not me that I say this, there are few guys in bimmerforums that has aM3 S/C and drove some M3 turbos (Kits that make a special company for the M3's) and said it was nicer to drive and he couldn't believe the car almost didn't have "lag" , and the whole response was better than his Dinan/Aftercooler S/C M3......go and discuss with him if you want. enough to me here.

Yes, it quite possibly has a better power curve as compared to RPM(since dinan uses a centrifugal SC), but not throttle position. Turbos never do.

[diegom6]

Instant boost IS response. You know, throttle response? A turbo has to spool and has no hardline connection to the engine, therefore the response will ALWAYS be worse. The fact that you claim a turbo will have better response than a supercharger really only goes to show how little you know about forced induction. Even hard core turbo junkies will always admit that a supercharger has better throttle response.

That's why I quoted "response" , yes a S/C will response or make boost earlier....but a if you want a fast spool and no virtual lag, you have to choice a properly saized turbo and must be BB system.

It's not me that I say this, there are few guys in bimmerforums that has aM3 S/C and drove some M3 turbos (Kits that make a special company for the M3's) and said it was nicer to drive and he couldn't believe the car almost didn't have "lag" , and the whole response was better than his Dinan/Aftercooler S/C M3......go and discuss with him if you want. enough to me here.

bye

[bimmer8604]

I haven't seen too many supercharged M20s on the net, because people go different routes. I'd say do it Mike, and be different.

If I had around 4gs to spend I'm considering going with a Rotrex unit for my M50. That is some distance away though. And, with 4k you could be putting in something else, like an entire engine.

325i E36
Stock::::::::::::::::158.2 WHP | 154.9 Ft/Lbs
AA Supercharger::::248.6 WHP | 216.4 Ft/Lbs
RW Gains:::::::::::::90.4 WHP | 61.6 Ft/Lbs

you should look at the Eurosport Twinscrew...

kyle

[Bavarian3]

Oh I don't plan to mod my M20... it's my DD... I was just wondering if it was worth importing..

Thanks for the ideas and comments guys.

[DEV0 E30]

I haven't seen too many supercharged M20s on the net, because people go different routes. I'd say do it Mike, and be different.

If I had around 4gs to spend I'm considering going with a Rotrex unit for my M50. That is some distance away though. And, with 4k you could be putting in something else, like an entire engine.

325i E36
Stock::::::::::::::::158.2 WHP | 154.9 Ft/Lbs
AA Supercharger::::248.6 WHP | 216.4 Ft/Lbs
RW Gains:::::::::::::90.4 WHP | 61.6 Ft/Lbs

[Insanity]

Instant boost IS response. You know, throttle response? A turbo has to spool and has no hardline connection to the engine, therefore the response will ALWAYS be worse. The fact that you claim a turbo will have better response than a supercharger really only goes to show how little you know about forced induction. Even hard core turbo junkies will always admit that a supercharger has better throttle response.

[diegom6]

but the supercharger has infinitely better response compared to a turbo.

lol !

Seems you dont know what you are talking.

Well it rally depends on what terms are you refering to better response. If you talk about "instant boost" well the S/C will kick first, but if you mean "the whole response" turbo is best by far.