Vortech supercharger

[Sportsguy83]

Originally Posted by 2forme

Volumetric Efficiency. Basically the engines ability to breathe efficiently.

My bad, got lost on acronyms.

[uspspro]

Well, also it goes pretty rich over 6000, check the AFR graph.

[2forme]

better rich than boom. LOL

[sw20kosh]

He is building up 1 less psi than Perrin due to the elevation. 1 psi means a lot in terms of HP. For example the 10 psi pulley is 3 psi over the "stock" 7 psi pulley and makes 40 more HP. By this you can see how much 1 psi more would give him at least.

One advantage of turbo systems is the wastegate will compensate for altitude. Meaning if you set the wastegate for 7 psi it will always keep the boost at 7 psi regardless of altitude. The turbo will be spinning faster to make that boost though and you may have a tiny bit more lag.

If Perrin develops a wastegated system for this SC, the same can be achieved. The wastegate will vent the pressurized air when it reaches the set psi. Skatery, I would seriously look into this option!

Another thing is the timing is obviously being pulled in the upper rpms as skatery confirmed is due to the tune being conservative due to his fuel up there.

[2forme]

Originally Posted by sw20kosh

He is building up 1 less psi than Perrin due to the elevation. 1 psi means a lot in terms of HP. For example the 10 psi pulley is 3 psi over the "stock" 7 psi pulley and makes 40 more HP. By this you can see how much 1 psi more would give him at least.

One advantage of turbo systems is the wastegate will compensate for altitude. Meaning if you set the wastegate for 7 psi it will always keep the boost at 7 psi regardless of altitude. The turbo will be spinning faster to make that boost though and you may have a tiny bit more lag.

If Perrin develops a wastegated system for this SC, the same can be achieved. The wastegate will vent the pressurized air when it reaches the set psi. Skatery, I would seriously look into this option!

Another thing is the timing is obviously being pulled in the upper rpms as skatery confirmed is due to the tune being conservative due to his fuel up there.

Absolutely. Toss on a smaller pulley and you can have low-mid range torque too..

[skatery1989]

Originally Posted by sw20kosh

He is building up 1 less psi than Perrin due to the elevation. 1 psi means a lot in terms of HP. For example the 10 psi pulley is 3 psi over the "stock" 7 psi pulley and makes 40 more HP. By this you can see how much 1 psi more would give him at least.

One advantage of turbo systems is the wastegate will compensate for altitude. Meaning if you set the wastegate for 7 psi it will always keep the boost at 7 psi regardless of altitude. The turbo will be spinning faster to make that boost though and you may have a tiny bit more lag.

If Perrin develops a wastegated system for this SC, the same can be achieved. The wastegate will vent the pressurized air when it reaches the set psi. Skatery, I would seriously look into this option!

Another thing is the timing is obviously being pulled in the upper rpms as skatery confirmed is due to the tune being conservative due to his fuel up there.

Smaller pulley is going to be on in two weeks. Still waiting to see on the wastegate

[2forme]

Originally Posted by skatery1989

Smaller pulley is going to be on in two weeks. Still waiting to see on the wastegate

What is your target PSI with the smaller pulley?

[skatery1989]

Hoping for 9 I think Jeff saw 10 on his car. This is the smalls pulley I can go with without changing the belt. I will eventually try to reach the 15psi the supercharger can make but not right now.

[gmookher]

For those of you who have never done FI at altitude, the math is simple, if @skatery1989 lives at 5000 feet, on a supercharger the loss will be about 5%HP on low side, even more as temps increase. I may be wrong here on the exact percentage, it may be 4% or 6% but lets just say there abouts per 1000

why? cause fuel is metered according to MAP, not altitude or boost

VE is never ideal % at altitude, volumetric efficiency is a ratio (or percentage) of what quantity of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions, ie ideal sea level and ideal temps. motors rarely see ideal. 3% is ideal loss. its more in real life.

I think its closer Approx. .5 psi boost per 1000' of atmospheric pressure is lost due to elevation. Boost plus atmospheric pressure is called absolute pressure. 14.7 psi at sea level +10 psi boost = 24.7 absolute psi.

if his atmos pressure at 5000 feet is 12.2psi, his absolute will be 22.2psi

if he is loosing 2.5psi due to altitude at 5000 feet, his MAP is lower, unless he spins his SC faster he cant compensate to make more power; but he can end up with too much MAP at sea level if Perrin and Vortech arent careful in dialin in and system setup.

At higher altitudes, air is less dense, and thus boost is decreased.
the goal should not be to have him make the same HP at 5000 feet as sea level, physics will make you have a bad day if you play that game

He's gotta be putting down over 220-225whp at sea level, as my guess, conservatively on 91 oct
on 92 -93 at sea level I suspect 240whp

Originally Posted by 2forme

Absolutely. Toss on a smaller pulley and you can have low-mid range torque too..

Yes, yes indeed, but its not my place to tell you this, no one would believe me anyways.. just lets wait for the dyno curve of THAT setup..at sea level, an its gonna knock your socks off,

-but wait theres more-

if the pulley gets you hot and bothered, the stuff I hear about thats being tested will surely make you shoot your load. This kit just keeps getting better.
and better
and better

makes me feel like I have donated my car to "science, and explorations of new frontiers for humankind"

http://www.wallaceracing.com/braking-hp.php

[rice_classic]

[gmookher]

'splain that please?

[2forme]

Gem, theres nothing new there, but now you're talking the already expensive price of the kit and then the cost of another pulley, just to get the advertised power of the basic kit. Lol

[Sportsguy83]

Originally Posted by 2forme

Gem, theres nothing new there, but now you're talking the already expensive price of the kit and then the cost of another pulley, just to get the advertised power of the basic kit. Lol

Yep! He is something!

[2forme]

Well the cost factor doesn't apply to him, because he's getting it for like half price... which would make a good value in his case.