CTS-VR Intake

[gtg732w]

I was exploring the other day and had an idea, what would it take to put the VR type intake on?

The previous owner put a Volant CAI on, so most of the parts are there, the only thing I need so far is an extension for the MAF plug, and a hood with more clearance.

I have a couple of pictures I need to post, but I am in the mock-up stage now (put it all together, take off the hood, see what I think). The only real issue is not having room under the hood.

Any thoughts? I was thinking that a straight intake tube pulling air from the hood would have to make more power, but I wanted to consult the brain trust.

Would it even be worth it?

Thanks,
Dan

[darkman]

Whether it will make any more power depends on what throttle body you are using as well as other modifications you make.

On a stock V LS6, the stock air intake, even with its snorkle and weird tube, will flow more air than the 78mm throttle body can accept. So increases upstream of the throttle body make no additional power.

[SoJersey05V]

closest thing i found was the New Era Performance Over the Radiator Intake for the G8's... thought it might fit... but it wont... there is alot of mod to do to get this to work... one guy here did a true over the rad intake but had to drop and lay back the rad... and for the HP increase... i dont see it being worth it...

[gtg732w]

Originally Posted by darkman

On a stock V LS6, the stock air intake, even with its snorkle and weird tube, will flow more air than the 78mm throttle body can accept. So increases upstream of the throttle body make no additional power.

In that case, how big of a restriction is the TB? If this mod were expanded to include a new intake and something like the FAST 90 TB (and proper tuning), would there be power to be gained? Or would the flow in the intake manifold/heads be restrictive enough to prevent any boost in power?

[gtg732w]

Originally Posted by SoJersey05V

closest thing i found was the New Era Performance Over the Radiator Intake for the G8's... thought it might fit... but it wont... there is alot of mod to do to get this to work... one guy here did a true over the rad intake but had to drop and lay back the rad... and for the HP increase... i dont see it being worth it...

I'm still not sure about the logistics, but I was thinking it would be easier to leave the radiator and make changes in the hood, either by adding a hood scoop or finding an aftermarket hood that will do the trick.

I know it would be most beneficial on a blown application (keeping intake temps low), and I fear that is the inevitable...

[darkman]

Originally Posted by gtg732w

In that case, how big of a restriction is the TB? If this mod were expanded to include a new intake and something like the FAST 90 TB (and proper tuning), would there be power to be gained? Or would the flow in the intake manifold/heads be restrictive enough to prevent any boost in power?

Based on my experience and dyno testing (on my engine) the 78mm throttle body is large enough to make about 380 rear-wheel horsepower as compared with stock horsepower of 325-330 RWHP. (These results are not applicable, of course, to forced induction.) On the other hand, the LS6 intake is known to support higher horsepower levels. As far as, adding a larger TB to an otherwise stock engine, I suggest you read this current thread: http://www.cadillacforums.com/forums...-90mm-ls6.html (Ls2 90mm on a Ls6?)

[Scatillac]

In addition to what Darkman says, the Kpa readings during the dyno pull is a most telling item in your motor's intake efficiency. Ask for a data log on your pull and look at your Kpa readings.

At WOT, the closer the Kpa reading is to 100 or slightly better, the more efficient your intake system is operating given your current motor's configuration. It's is important to note that any modification levels and/or displacement increase will show up as a decrease, if the intake system ahead of the throttle body is indeed causing a restriction.

With our cars, the IAT is critical also, so placement of the MAF (where the IAT sensor lives), can also be important.