Ray S

I am thinking about putting the Evo "V-Flow" High flow Induction system on my '02 C2.

Does anyone have experience with this unit? Good....Bad....Ugly...

Here is the link...[URLhttp://www.evoms.com/porsche%20ec%20art%20test.htm]Evo "V-Flow" 996/997 Intake[/URL]

dallasboats

You will love it. Don't forget the cpu upgrade. It's the best bang for the buck out there, I've found.

PorscheDoc

I second that.....

snaproll

Anyone else notice that EVO claims "over 25 HP" with the intake and the chip, but their dyno shows 16.6?

Excellence magazine did an article about three years ago and concluded the 996 doesn't realize significant power gains from bolt-ons.

TT Surgeon

Depends on the upgrade and your definition of significant. There are gains to be made, but the motor is already pulling 80% VE, it's all about volumetric efficiency.

Ray S

I probably won't upgrade the chip for a while. Is there a power gain without changing the ECU or is it just a "sound" upgrade?

kc996

I think the "over 25 HP" refers to the hp at the engine and the 16.6 refers to what is put down at the wheel. I think it's something like you lose 12% to 15% going from the engine to what is put down at the wheel.

Also, in the Excellence article, if I recall correctly the 3.4L engine (99-01) saw more hp gains from chipping and cold air then the 3.6L (02+) saw.
k

washington dc porsche

The Excellence Magazine from a couple of months ago concludes that the 996 does make gains, specifically with the EVO V flow and the GIAC flash.

washington dc porsche

The '99's get the most out of the GIAC flash and the 02's+ get the least

Tim Wasmer

WHOA there sparky............

Please explain this a bit more in depth. You know your poop so I think we can learn something

Teach on Professor

TT Surgeon

In terms of efficiency of power produced to L displacment for a given fuel charge, at a std atm/temp/fuel/comp ratio. The m96 engine is making alot of hp/L stock, therefore alot of pathways may be already or nearly maxed out ( intake manifold, camshaft profile, valves,compression ratio, cylinder head flow intake/exhaust). At 320hp a 3.6L is making 89hp/L, 100% volumetric efficiencyis the max for a NA motor without forced induction, roughly( many, many other factors involved) 100hp/L displacement for argument sake. In comparison, look at a small block chevy, 5.7L engine, clogged up intake and exhaust/cylinder heads/comp ratio etc, barely makes 255hp, that's 45hp/L, roughly 45%VE, at 88%VE like the m96, you're looking at 502hp out of the 5.7L!
To get a good basic understanding of racing engines, read "The Chevrolet Racing Engine" By Bill "Grump" Jenkins, details alot of this type of stuff. Somewhat dated, but a good read and basic principals apply still. Jenkins still pioneers alot of NASCAR/NHRA engine building techniques.

Dale Gribble

so in theory at least..the 3.4L should be able 2 make 340HP when all avenue's of improvement have been explored. this begs the question: what's left, besides yanking all the government emissions junk and dropping a ton of $$$ on hot race cams and custom ecu stuff? prolly not much then since as you said the motor's are already running at 80+& VE.

Turbo's exceed this principle by (very layman definition) forcing a lot of air into the cylinders which otherwise wouldn't be possible with a conventional intake, rite?

BlackCab996

Guys - I'm sorry if this is a stupid question, but does a cold air intake and a chip modification void the car's warranty?

Tim Wasmer

Chris:

My brain hurts now

Wouln't it begto say though that for me, at a higher altitude, adding mor air flow and reducing exhaust restriction should help? Because my car would be running far less than the quoted 80% VE here right?

Anyone but me ever get amazed by the fact that someone came up with all this VE etc. info?

ca996

I have an 02 with the fabspeed cold air intake and then had the GIAC chip.......after a month I had the chip taken off as I felt no improvement to justify the cost. Frankly, I can't imagine the EVO cold air intake being that much better than the fabspeed to make any significant gains, although I could be wrong doubt it though.