TwinCharger???

[BlackonBlack89]

The second point goes to a poster from the 1st page. They said that the turbo would spool fisrt then when it ran out, the supercharge would take over. This is exactly backwards. The supercharger would come on first, then run out of breath as the turbo would quickly overtake it with compressed air flow.

Yes but I was going based off a centrifugal supercharger which is common for SHO. Which you know is not like a PD blower like an M66 or M90. Thats the only way I've seen a twinvhargered setup (PD blower and big turbo). My idea (just a random dumb idea) is if a centrigual blower (vortech) could be force fed like an PD blower (eaton M90).For the lower RPMs used a undersized turbo in a remote setup then let the big old vortech take over the high RPMS cause they don't start building boost till 4.5 RPMS or so.

Again just a random What If idea . :laugh_ti: I was bored when the thread started

 

[38SHO]

eloquent.


There are two points here. First, this solves the limitations of a big turbo on any high-winding engine. With a big turbo, it is a cork in the exhaust until you finally get it turned up and making boost. So from idle to 4000rpm, the car runs like stock. At 4000 it starts to make a little power, then by 6000rpm it really comes on and the world comes to an end in that last 1000rpm. By compounding the compressors, the PD blower will increase the exhaust output down low and spool the turbo sooner in the power band. So instead of having full boost at 6000, you've got it at ~3000rpm.

I don't know about you, but even on my N/A 3.2 I RARELY see RPM's below 4k rpm when I'm on it........ I'd imagine with 400hp and tire spin, 3-4k rpm would be useless and damn near non existant as the motor winds out very fast....

i think if you had a turbo that fully spooled at 6krpm.. your turbo is way too big for our application.... I.E. that shuold make more power then our engine/drivetrain can handle realistically......

if your goal was to have some kind of top end highway monster where 200mph was your goal.... then a turbo like you mention would be nice....... but then again who cares about turbo lag because it wouldn't be an issue with how you use the vehicle........

can't have it all......... and I would think mixing a roots blower would put strain on the engine.... and it would almost certainly have to be a restriction for a huge turbo to blow through on its way to the cylinders........ its just more of a headache and about 98% unnessecary

 

[Toolman]

With a properly sized turbo, there simply is no reason for a PD blower, IMO. A 62-1 is not exactly a small turbo, yet mine had no problems with lag. Did it spool a little slower than the small T3/4 I had previously? Obviously, but that actually helped with traction, as the TQ came on quicker than desired in that T3/4. A little brake boosting with the 61 and you had all the boost you could ever use on the street, from about any speed. Considering that 62-1 had the capability of producing well over 600hp, I can not imagine why anyone would spend time engineering a dual-blower setup (but then, I can not imagine why any of you guys spend time with your Vortech's anyway! ).

If you simply must have big TQ down low, and the thought of waiting a second or two on your turbo to spool, or for your Vortech to see boost, a little laughing gas should do the trick!

 

[SHOmethewayhome]

correct me if I am wrong but didn't audi try to do this in their old Group b or group n rally car?

boost with Centrifugal blower first, then switch to turbo after the blower stops generating pressure, they had a problem with going from full S/C boost to no boost momentarily and then back to full turbo boost. i'm gonna go dig it up if i can find it.

looks like Lancia did to, but they both ran it with 600 ponies, so fast that after two accidents (lancia crash killing driver and nav. ford RS200 crash wiping out 3 bystanders) they kinda washed away group b.