Questions and Discussion on Vortech Supercharging Systems

[Brian@Vortech]

In an attempt to stop the Perrin threads from getting drastically off course, please pose all questions and/or comments about the Vortech systems not directly associated with Perrin/Visconti/etc.'s own versions of Vortech System packages they are selling in this thread instead of theirs.

Thank You

[Calum]

What is the max rpm of the SC included in the kit? What rpm is the SC at when the engine is at stock redline with the 'stock' pulley? With the smaller pulley? Why doesn't the kit include a pressure regulator so a smaller pulley can be run to maintain a boost pressure instead of only reaching max boost at the end of the rpm range?

That all I've got for now. Thanks a ton for doing this!

[Brian@Vortech]

Originally Posted by Calum

What is the max rpm of the SC included in the kit?

The V-3 H67BC Supercharger has a maximum impeller speed of 50,000 rpm

Originally Posted by Calum

What rpm is the SC at when the engine is at stock redline with the 'stock' pulley?

The pulley that is included with the kit is a 3.60" pulley on the supercharger. The impeller speed at 7,400 engine rpm with this pulley would be 41,588.

Originally Posted by Calum

With the smaller pulley?

We have several to choose from.

A 3.48" S/C Pulley = 43,022 @ 7,400 engine rpm
A 3.40" S/C Pulley = 44,034 @ 7,400 engine rpm
A 3.33" S/C Pulley = 44,960 @ 7,400 engine rpm
A 3.25" S/C Pulley - 46,066 @ 7,400 engine rpm
A 3.125" S/C Pulley = 47,909 @ 7,400 engine rpm
A 2.87" S/C Pulley = 52,166 @ 7,400 engine rpm, which is beyond the maximum impeller speed, and therefore we would advise against utilizing with this system.

Originally Posted by Calum

Why doesn't the kit include a pressure regulator so a smaller pulley can be run to maintain a boost pressure instead of only reaching max boost at the end of the rpm range?

Because we design our systems to reach a maximum boost pressure at redline, for a linear boost curve and maximum efficiency. Spinning a compressor faster just to intentionally bleed off cfm reduces the efficiency of operation, and therefore lessens the benefit of a high efficiency supercharger such as a Vortech.

Originally Posted by Calum

That all I've got for now. Thanks a ton for doing this!

You are most welcome.

[Calum]

Wow, awesome!

So, assuming an otherwise stock setup, approximately what boost pressure would be reached with each pulley? Or would that be so variable that it would impractical to answer?

[MANDALAY]

So as i have said the SC is underdriven by plus 16%

So you are NOT even utilising the SC to its ability at all. You have purposely geared it down to get this to run at 7 psi at red line 7,400.
So if that be the case i wont argue against that at all but where does it sit on the island plot. Care to share that ?

Your comment quote

"Because we design our systems to reach a maximum boost pressure at redline, for a linear boost curve and maximum efficiency. Spinning a compressor faster just to intentionally bleed off cfm reduces the efficiency of operation, and therefore lessens the benefit of a high efficiency supercharger such as a Vortech "

Is not accurate as its NOT at its maximum boost its undergeared.

Why was this so HARD to squeeze out the information ? Personally i am totally surprised NO ONE had brought this up at all.

[OjiGeorge]

Originally Posted by MANDALAY

So as i have said the SC is underdriven by plus 16%

So you are NOT even utilising the SC to its ability at all. You have purposely geared it down to get this to run at 7 psi at red line 7,400.
So if that be the case i wont argue against that at all but where does it sit on the island plot. Care to share that ?

Your comment quote

"Because we design our systems to reach a maximum boost pressure at redline, for a linear boost curve and maximum efficiency. Spinning a compressor faster just to intentionally bleed off cfm reduces the efficiency of operation, and therefore lessens the benefit of a high efficiency supercharger such as a Vortech "

Is not accurate as its NOT at its maximum boost its undergeared.

Why was this so HARD to squeeze out the information ? Personally i am totally surprised NO ONE had brought this up at all.

Dude, you need to chill out. Vortech is doing the community a huge solid by being active on the boards. This kind of behavior discourages other vendors from becoming actively involved in the community and hurts everyone.

[kanundrum]

What are you doing to ensure the Bearings and Seals do not fail?

[j-tan]

Originally Posted by MANDALAY

So as i have said the SC is underdriven by plus 16%

So you are NOT even utilising the SC to its ability at all. You have purposely geared it down to get this to run at 7 psi at red line 7,400.
So if that be the case i wont argue against that at all but where does it sit on the island plot. Care to share that ?

Your comment quote

"Because we design our systems to reach a maximum boost pressure at redline, for a linear boost curve and maximum efficiency. Spinning a compressor faster just to intentionally bleed off cfm reduces the efficiency of operation, and therefore lessens the benefit of a high efficiency supercharger such as a Vortech "

Is not accurate as its NOT at its maximum boost its undergeared.

Why was this so HARD to squeeze out the information ? Personally i am totally surprised NO ONE had brought this up at all.

I don't really know if actually understand the way it works. It reaches maxium boost for the pulley size. Smaller pulley = more boost, if you over spin the SC it will overspin the unit. If you want higher boost than this unit you'll have to wait till vortech make a bigger unit.

[JP]

what impeller speed/pulley size is needed on the 86 kit to reach say 7psi at 4000rpm if you're using a wastegate/bypass valve or similar to bleed boost to maintain 7psi from 4000rpm to redline?

[Dimman]

Compressor map would be nice.

[Acree]

Originally Posted by Brian@Vortech

Because we design our systems to reach a maximum boost pressure at redline, for a linear boost curve and maximum efficiency. Spinning a compressor faster just to intentionally bleed off cfm reduces the efficiency of operation, and therefore lessens the benefit of a high efficiency supercharger such as a Vortech.

As an engineer, I completely understand this. As a customer, I don't really give a damn.

My dream SC would hit full boost early in the revs and hold it like a turbo. This would give the torque curve of a turbo, the response of a supercharger, without the horrid whine of a roots type.

Can your company deliver this?

-Acree

[bestwheelbase]

Originally Posted by Acree

As an engineer, I completely understand this. As a customer, I don't really give a damn.

My dream SC would hit full boost early in the revs and hold it like a turbo. This would give the torque curve of a turbo, the response of a supercharger, without the horrid whine of a roots type.

Can your company deliver this?

-Acree

Aren't you describing a twinscrew?

[MANDALAY]

Originally Posted by OjiGeorge

Dude, you need to chill out. Vortech is doing the community a huge solid by being active on the boards. This kind of behavior discourages other vendors from becoming actively involved in the community and hurts everyone.

Im relaxed buddy. Its just as soon as someone questions something many turn on you , what for ?

Im not trying to discourage Vortech but rather the information be given. They do know the answers i seek just crazy that noone has asked.

I would like to know is the SC being limited to 7 psi because thats what they believe the max for the engine Stock ?

You have to be aware the way the SC belt driven works that its geared to maximum psi at red line. This belieng under geared the system will be running mostly only 3-4 psi, unless you red line every gear.
This is not how we drive on the street.

I for one do love the reponse of a belt driven SC but being this low its a waste since you will have 7 psi at 7,400.
Then there are other calculations like the drain of the SC on the engine and the psi lost in the IC.

[MANDALAY]

Originally Posted by Dimman

Compressor map would be nice.

Dito ! Again why hasnt it been posted.

Dont know how people buy but gee i would want to see that way before i even entertained the thought of buying something.