Vararam Installed! Results!
Team Owner
Joined: Dec 2003
Posts: 57,408
Likes: 164
From: queensbury ny
I'll probably get the car dyno'ed soon before I add exhaust/tune, so we'll see what kinda power the LS3 w/Vararam is making
Thread Starter
Drifting
Joined: Aug 2004
Posts: 1,803
Likes: 17
From: Walnut Creek, CA
Team Owner
Joined: Dec 2003
Posts: 57,408
Likes: 164
From: queensbury ny
the car is stationary, but what about that huge fan that is shooting air into the front of the car...that doesnt mimic the real-world effect at all?
There are dozens of threads on what it does on the track and street for both the C5 and C6.The best part is you don't have to drive around w/your hood open for cold air like one would need to do w/the other stuff out there.
Instructor
Joined: Feb 2008
Posts: 171
Likes: 0
From: Sahuarita AZ
I just installed a Vararam on my 08 Z51 and I also recently put Kooks headers on the car....car feels really strong on the highway!!
The install is kinda tricky, but finally got it in, but I noticed that its rubbing the inner hood liner and that does not make me happy.
It sits really high up and I am going to have to do some more tweaking on it, but not sure how to get it to sit lower.....any suggestions?
The install is kinda tricky, but finally got it in, but I noticed that its rubbing the inner hood liner and that does not make me happy.
It sits really high up and I am going to have to do some more tweaking on it, but not sure how to get it to sit lower.....any suggestions?
Burning Brakes
Joined: Jul 2006
Posts: 1,230
Likes: 0
From: Sulphur LA
rationale (sp?)
I think the reasons for doubt on the TB spacer have something to do with the differences between modern fuel injection and old-tech carburation. On a carburated motor, the carb mixes the fuel and air at the inlet to the manifold....adding a spacer under the carb (adding plenum volume) allows the air/fuel to (possibly) mix better before being distributed to the cylinders. Ever look down into an old manifold and see a grid or louver cast into the floor of the plenum? same purpose--to promote air/fuel turbulence/mixing. Fast forward to 21st century technology.....where we have fuel injectors spraying a fine mist pretty much directly onto the intake valve....what good will increasing plenum volume do when the fuel is added to the mixture downstream of the plenum? Nothing. Now the engineers who designed these things might have different explanations and I am not attempting to dispell their research....this is only a "shade tree/good 'ol boy" explanation with no scientific research to support it. But there is a good chance that this is what your tuner is thinking....besides he obviously has a dyno and has probably tested these kinds of things :o ANYWAY there are actually a few cases where the spacer did help out signifigantly on FI apps----TBI for one. But you have to remember that the location of the injectors on TBI is simillar to a carb....where increased plenum volume would aid in mixing air/fuel. So there it is
my explanation is for entertainment/thought provoking purposes only....i am not attempting to start a debate or argument. so if others want to chime in on this subject....feel free, but I have nothing else to say.
Now go away, or I will taunt you a second time.....
But there is a good chance that this is what your tuner is thinking....besides he obviously has a dyno and has probably tested these kinds of things :o ANYWAY there are actually a few cases where the spacer did help out signifigantly on FI apps----TBI for one. But you have to remember that the location of the injectors on TBI is simillar to a carb....where increased plenum volume would aid in mixing air/fuel. So there it is my explanation is for entertainment/thought provoking purposes only....i am not attempting to start a debate or argument. so if others want to chime in on this subject....feel free, but I have nothing else to say.Now go away, or I will taunt you a second time.....
Last edited by bent; May 24, 2008 at 01:14 PM.
Advanced
Joined: May 2008
Posts: 82
Likes: 0
From: Clearwater Florida
Try this
I just installed a Vararam on my 08 Z51 and I also recently put Kooks headers on the car....car feels really strong on the highway!!
The install is kinda tricky, but finally got it in, but I noticed that its rubbing the inner hood liner and that does not make me happy.
It sits really high up and I am going to have to do some more tweaking on it, but not sure how to get it to sit lower.....any suggestions?
The install is kinda tricky, but finally got it in, but I noticed that its rubbing the inner hood liner and that does not make me happy.
It sits really high up and I am going to have to do some more tweaking on it, but not sure how to get it to sit lower.....any suggestions?
Read this article, I believe it will fix your issue.
http://www.gmhightechperformance.com.../photo_29.html
Cheers!!
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Drifting
Joined: Jun 2007
Posts: 1,757
Likes: 2
From: Middletown DE
NOPE.VARARAM will show next to nothing on the DYNO-IT'S not a DYNO queen,it's a real world monster!! There are dozens of threads on what it does on the track and street for both the C5 and C6.The best part is you don't have to drive around w/your hood open for cold air like one would need to do w/the other stuff out there.
There are dozens of threads on what it does on the track and street for both the C5 and C6.The best part is you don't have to drive around w/your hood open for cold air like one would need to do w/the other stuff out there.
Race Director
Joined: Apr 2005
Posts: 10,436
Likes: 4
From: Everett Wa
I think the reasons for doubt on the TB spacer have something to do with the differences between modern fuel injection and old-tech carburation. On a carburated motor, the carb mixes the fuel and air at the inlet to the manifold....adding a spacer under the carb (adding plenum volume) allows the air/fuel to (possibly) mix better before being distributed to the cylinders. Ever look down into an old manifold and see a grid or louver cast into the floor of the plenum? same purpose--to promote air/fuel turbulence/mixing. Fast forward to 21st century technology.....where we have fuel injectors spraying a fine mist pretty much directly onto the intake valve....what good will increasing plenum volume do when the fuel is added to the mixture downstream of the plenum? Nothing. Now the engineers who designed these things might have different explanations and I am not attempting to dispell their research....this is only a "shade tree/good 'ol boy" explanation with no scientific research to support it. But there is a good chance that this is what your tuner is thinking....besides he obviously has a dyno and has probably tested these kinds of things :o ANYWAY there are actually a few cases where the spacer did help out signifigantly on FI apps----TBI for one. But you have to remember that the location of the injectors on TBI is simillar to a carb....where increased plenum volume would aid in mixing air/fuel. So there it is my explanation is for entertainment/thought provoking purposes only....i am not attempting to start a debate or argument. so if others want to chime in on this subject....feel free, but I have nothing else to say.
Now go away, or I will taunt you a second time.....
But there is a good chance that this is what your tuner is thinking....besides he obviously has a dyno and has probably tested these kinds of things :o ANYWAY there are actually a few cases where the spacer did help out signifigantly on FI apps----TBI for one. But you have to remember that the location of the injectors on TBI is simillar to a carb....where increased plenum volume would aid in mixing air/fuel. So there it is my explanation is for entertainment/thought provoking purposes only....i am not attempting to start a debate or argument. so if others want to chime in on this subject....feel free, but I have nothing else to say.Now go away, or I will taunt you a second time.....
Not a debate but there is a simplier explanation. The spacer effectively adds runner length. In the old days this would tend to increase torque at the expense of top end hp. In todays world who knows.
Safety Car
Joined: Dec 2004
Posts: 3,565
Likes: 5
From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
I think the reasons for doubt on the TB spacer have something to do with the differences between modern fuel injection and old-tech carburation. On a carburated motor, the carb mixes the fuel and air at the inlet to the manifold....adding a spacer under the carb (adding plenum volume) allows the air/fuel to (possibly) mix better before being distributed to the cylinders. Ever look down into an old manifold and see a grid or louver cast into the floor of the plenum? same purpose--to promote air/fuel turbulence/mixing. Fast forward to 21st century technology.....where we have fuel injectors spraying a fine mist pretty much directly onto the intake valve....what good will increasing plenum volume do when the fuel is added to the mixture downstream of the plenum? Nothing. Now the engineers who designed these things might have different explanations and I am not attempting to dispell their research....this is only a "shade tree/good 'ol boy" explanation with no scientific research to support it. But there is a good chance that this is what your tuner is thinking....besides he obviously has a dyno and has probably tested these kinds of things :o ANYWAY there are actually a few cases where the spacer did help out signifigantly on FI apps----TBI for one. But you have to remember that the location of the injectors on TBI is simillar to a carb....where increased plenum volume would aid in mixing air/fuel. So there it is my explanation is for entertainment/thought provoking purposes only....i am not attempting to start a debate or argument. so if others want to chime in on this subject....feel free, but I have nothing else to say.
Now go away, or I will taunt you a second time.....
But there is a good chance that this is what your tuner is thinking....besides he obviously has a dyno and has probably tested these kinds of things :o ANYWAY there are actually a few cases where the spacer did help out signifigantly on FI apps----TBI for one. But you have to remember that the location of the injectors on TBI is simillar to a carb....where increased plenum volume would aid in mixing air/fuel. So there it is my explanation is for entertainment/thought provoking purposes only....i am not attempting to start a debate or argument. so if others want to chime in on this subject....feel free, but I have nothing else to say.Now go away, or I will taunt you a second time.....
way to go. first figure it out, learn why it does what it does, determine what makes it better/worse, mod as desired. spacers post mix (a/f) create larger voids for mass.
spacers pre mix effect airflow only.
traditionally, longer taller runners runners are preferred (the straighter the better), however, fi (fuel injection) is a slightly different story.
the runners on most fi. (fuel injected) engines only pass air.
the runners on carb'd engines, with or without spacers, pass both air and fuel.