| T O P I C R E V I E W |
| KamakazieX |
Posted - Nov 21 2005 : 9:02:13 PM
How about fitting a Vortech V-2 Supercharger to the RX?
If you can safely run 7lbs on a camden roots type blower, how about a Vortech V-2 running safely at 8-12lbs of boost?
Seems like a much safer idea for a street driven car. Following all the basic principals of a boosted vehicle..
Remove sleeves/ports. block off plates installed, remove cold start, remove egr.
What I'm trying to figure out is comparing it to a piston engine, a V-2 supercharger for a 3.8 Mustang if the crank (eccentric) shaft pulley size was the same as the RX7's we could potentially have a much stronger vehicle here in power and reliability, with the gain of the tourqe needed to launch, and the safety of not worrying about blowing the motor or turbo/charger, if the belt breaks, you just run rich, which can't really hurt a rotary other than possibly flooding it..?
You got any ideas on a barebones to start with if I were able to successfully mount a V-2 Vortech to my rx7? Do you think an intercooler would prove a phoenominal efficiency improvement on top of this (>18%).
Getting brakets for it to fit to the block will be easy, it can take place of the air pump. However, a correctly sized pulley would be the key in all of this with a properly set wastegate and blow off valve.
I have no experience in supercharging but with these type of superchargers I'm assuming it would be much much similar air flow to a turbocharger (since the housing is the same design) as opposed to a roots type blower.
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| 3 L A T E S T R E P L I E S (Newest First) |
| Aaron Cake |
Posted - Nov 30 2005 : 09:10:18 AM
If it will truly produce those numbers, then it sounds like a decent plan. Planning to run an intercooler?
As for the check valve, what series RX-7? The S4 has a split air pipe with a valve which gets discarded when you go catless (an thus connect your ports to the airpump....er, blower). S5, I'd have to check the manual but since it's air pump operated anyway, it's indipendant of the exhaust.
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| KamakazieX |
Posted - Nov 29 2005 : 4:00:04 PM
Thanks.
I think the Vortech V-2 will work a little better than the paxton kit. This blower will spin up to 45k evidently and output 22lbs at 45k. This will balance out top end power and at the same time sustain traction with the stock wheels. I sized pulleys for it, this is what I came up with, I spent alot of time reading the compressor map..
6lbs at 3k
9lbs at 5.5k
12lbs at 7.2k
with a 3.5" pulley... at 12lbs the blower is only moving at 30,000rpms, and 45 is its peak.
I dont think the whole side of the engine bay is too ,much of a trade off, or using the sawzall on the hood for some fiberglass mods :-) . I've also got an extremely ported out TB, removed front plates, ported lower/middle manifold, port matched the rest.
I was wondering if it was required to keep the air check valve (if thats what resides between the actuators on the lower manifold) if you have the racing beat presilencer for operation of the actuators.
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| Aaron Cake |
Posted - Nov 22 2005 : 09:16:20 AM
quote:
How about fitting a Vortech V-2 Supercharger to the RX?
OK. It would be similar to the old Paxton kit then.
quote:
If you can safely run 7lbs on a camden roots type blower,
One of the most poorly designed aftermarket kits ever, unfortunately. 
quote:
how about a Vortech V-2 running safely at 8-12lbs of boost?
Boost is boost (basically). You can run as much as you want as long as you have the timing and fuel.
quote:
Remove sleeves/ports. block off plates installed, remove cold start, remove egr.
Why is any of this necessary? Cold start removal makes the car a pain to drive when it's cold, removing the EGR gets you nothing, and removing the sleeves is going to make the lack of low end from the centrifugal blower even worse.
quote:
What I'm trying to figure out is comparing it to a piston engine, a V-2 supercharger for a 3.8 Mustang if the crank (eccentric) shaft pulley size was the same as the RX7's we could potentially have a much stronger vehicle here in power and reliability, with the gain of the tourqe needed to launch,
I doubt you'll gain much down low since a centrifugal blower is like a turbocharger in that it's output is directly related to the speed at which it spins. But unlike a turbo, the blower is directly tied to the eccentric so there's basically no way to obtain boost at low engine speeds and not wildly overspeed the blower at high engine speeds.
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and the safety of not worrying about blowing the motor or turbo/charger,
Boost is boost. There's nothing safer about a supercharger vs. a turbocharger.
quote:
You got any ideas on a barebones to start with if I were able to successfully mount a V-2 Vortech to my rx7? Do you think an intercooler would prove a phoenominal efficiency improvement on top of this (>18%).
I personally wouldn't waste my time. You'll make more power using even the tiny stock turbo with less cost and less pain in the butt.You will also have a much flatter powerband.
quote:
Getting brakets for it to fit to the block will be easy, it can take place of the air pump. However, a correctly sized pulley would be the key in all of this with a properly set wastegate and blow off valve.
Ever seen one of those blowers in person?  They're HUGE. It's not so mcuh taking place of the air pump as totally dominating that side of the engine bay.
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