Super vs. Turbochargers....A brief discussion

[Alec]

The BBK is supposed to provide more low-end boost than other superchargers. However, it has a pretty even boost curve and therefore doesn't do as much as higher speeds (RPMs). I'll let y'all know how it does when I get it in January. I have another thread: "on my way to the supercharger".

 

[markhas]

Eaton Blower

Yes the roots blowers make great low end torque and the boost is very linear. See my dyno sheet in a previous post. However you are putting this blower on a V6 that doesn't have much power to begin with, so your gains will be limited by what the engine can flow. Opening up the exhaust, using larger exhaust valves on the heads, using a blower cam, would all help a lot more. The intake valve is not that critical since the intake is under pressure, so the combustion chamber fills quickly. Getting the gasses out of the engine is the main concern with turbos or superchargers. Of course you need to have a mass air and throttle body large enough to feed the supercharger ... but don't go too large, otherwise part throttle response will suffer.

 

[Alec]

These are the power mods I have: K&N FIPK, BBK 66mm TB, Hypertech module (to be replaced by BBK module), JBA headers, and Magnaflow cat-back. BBK said this group of mods will be perfect for maxing performance of the supercharger (without internal engine mods). They also said a larger MAS on the Explorer won't do anything (in this low power range).

 

[SeanM]

Sorry to change the topic...But I was trying to think about a question that would open up some new discussion...Only thing I could come up with is the following...

Is it possible(assuming there are infinite amounts of time and money)to both supercharge(for low-end power) AND turbocharge(high-end power) an engine?

I was only wondering about that just to see if it was actually possible because I am assuming that would give an engine low-end power as well as high-end power. Is it at all possible? Would it be practical? Explain....

Keep it coming guys.....

Sean
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'95 XLT 4dr 4.0L V6 OHV Auto
Flowmaster 40 series Cat-back
K&N FIPK
Bosch 4+ Platinum plugs
Splitfire ignition wires
PIAA 9007 Super-White Headlights(adds 40 rearwheel hp )

 

[Cameron]

I'm sure it possible but I never heard of it. The correct way would be to use sequential turbochargers. That is, you have two turbos in sequence. The first turbo is a small one that spools up very quickly, eliminating (for all intent and purpose) lag. Then, at a set RPM, the larger turbo kicks in and handles the upper end.

Look at the RX7s.

 

[QuadCam]

HKS used to make a "twin charger" set-up for the 1st generation supercharged MR2. The HKS kit added a turbocharger to the already supercharged engine.

I've never seen one of those kits, but I know it did exist.

Andrew

 

[blk mk8]

some guy with a lighting pick up truck put a paxton novi 2000 on a truck that all ready had a eaton supercharger on it. he said it made better all around boost.