A public retraction I didn't want buried in the huge ATI thread.

RE: Doug's plenum and the ATI procharger combo,

His STB will fit, my buddy didn't have it on correct, I talked to Doug in TN (great guy) and he told me how to get it to fit.
The Crawford plenum and stock STB will not fit.

So this plenum is a great mod for the ATI Pro Charger and if you had STB concerns because I said it didn't fit don't it does and I recant saying it doesn't. More air in. Air makes HP!

Peas!

P.S. No one told me to post this, I wanted to help others in the future it is not because of any pressure from anyone, I want that *clear*.

Everyone I have dealt with in my mod progressions (excluding the makers of an Oxegen product that adds +2 points of Nitrogen creating N20) has gone above and beyond to assist me making my car what it is today. A V6 sleeper that will smoke you!

Thanks.

 

Heh, I never thought of the Z as a sleeper

 

So will ATI owners lose a small amount of boost due to the increase of air flow of the plenum?

 

Well at 362.5 HP and growing I mean. No one revving on you would expect *that* I mean we are talking being in another zip code when other V6's finish shifting into 2nd.

SCOnline,



Depend on what pulley they use.

It remains to be seen because I believe I am the onlu one with the combo and I got 6.3 at max boost.

I can't say it was the plenum though because I added Borla Headers and Borla True Dual.

Think of it this way though. What makes HP? In it's purest form, when it is first beggining?

Oxyegen. What does the Plenun do? Allow more. My Crawford plen stays on if anything it's feeding the 1-2 cylinders more air and will allow me to raise the boost level thus giving me more torque.

 

Max I have got to say you have a nice setup. Oh and the Weimaraner is nice too.

 

I would expect less boost pressure as you free up the intake. By removing intake restriction, it becomes easier to stuff air in, so the boost pressure you see might be less. However, that does not mean that you will lose power because you are now stuffing a larger volume of air into the intake. More air= more power (assuming proper tuning for more air). More boost does not always equal more air volume, hence more boost does not necessarily mean more power. Comparing boost to boost on two cars means nothing without taking into account all the variables....

If my car boosts 7 psi with the stock intake, while Max gets his 6.3 psi with the modified intake, AND everything else is the same, then he should make more power because of greater air volume.

 

That was EXACTLY my thought as well. You could make a less efficient plenum and have a higher boost but that certainly would not lead to more HP, it would be much less HP.

 

...and you can then go with a smaller pulley size to make up for the boost you lost which overall will = WAY MORE HP

 

Think of it like blowing through a straw, vs blowing through a drink stirrer thing. You might have more pressure in your cheeks when blowing into the little stirrer, but in the end, you pass less air out than you do when you blow through a bigger straw.

Of course, I'm sure there is an optimum point somewhere in there where the velocity of the incoming air is important as well.

 

Interesting, Max, how did you measure 6.3 psi???

I see how this effects the SC, guess it could allow more boost for a turbo setup also.

One thing that is a little unclear to me, you guys are saying a greater volume of air=more power. Well, isn't this air under pressure?? If we are talking air under pressure, things change, IMO. With the volume of the stock plenum, there is an amount of air inside with more pressure. With the Crawford's increased volume, the amount of air inside is under less pressure. But in my opinion (as an engineer), they are still the same amount of air, hence the same amount of horsepower, one is just under more pressure.

Now, with the decrease in pressure of the Crawford, it would allow you to run more boost, which in turn would give you more horsepower. But I don't see when you have air under less pressure, how it has more volume than air under more pressure, given that both are taking in the same amount of air from same kind of intake.

Seems to me, the SC is still compressing to 7psi, but because the added space given by the Crawford for the front cylinders, the pressure drops to 6.3 psi. But we are still talking about the same amount of air, right??? I think so.

IMO, the only way you have more air is if you had the same pressure (7psi) WITH the crawford.

 

ATI gives you a 7 lb pulley it's up to you how much of that 7 you get it's not written in stone.

I have read and been told that with this kit and the numerous dyno's we ran 1 lb of boost equals 15 HP (it all comes down to math after 23 dyno's.)

So lets say I add a 9 lb pulley (which I can because I have more headroom than a stock car.)

That should equal 3 more lbs or 45 more HP. Maybe more maybe less it hasn't been done yet on a setup like mine.

Pressure is not an issue trust me. When you drive the car with your SC installed you will understand, I'm making *plenty* of pressure I just have more room for more air and it is scavenged better than a stock setup. I am glad they designed it this way, stock car stock SC setup California Carb number some day? Makes sense to me! After market setup kit designed to make max boost with modded setup, no CARB #?

"...and you can then go with a smaller pulley size to make up for the boost you lost which overall will = WAY MORE HP"

Exactly, and that is the route I am going ; along with this pulley change I should yield higher torque too!

It's a good kit and the more people install it with different setups the more data ATI can compile and then we can formulate conclusions. Right now the kit is designed for stock Z's and it is my belief that the closer you are to stock the higher boost you will get (by the way, someone asked. A good Dyno should print out your boost levels at all rpm's (FFP's does and it fluctuates as it rises and it changes with tuning) you really need a Dyno to install this right. Thanks for the compliment on my Wiem my only child, that's "GiGi!" My guard dog!


__________________

 

I agree that you can go with a smaller pulley cause your engine is seeing less boost. But I don't see how you are getting more HP the way it is currently set up. I can see how the Crawford makes power in an N/A setup, easy. But under boost pressure, I would love to see a dyno with and without it (with the same pulley, of course).

 

I'm getting more HP because my car was TUNED right not because of the plenum. The plenum will come into play as will my exhaust when I ad the 9lb pulley.

I don't recall ever saying that I am getting more HP because of my Crawford Plenum. Can you cite your source for that statement?

 

Dude, me and you are real cool, and you know that. Just trying to get to the truth.