Cadillac XLR Volant Cold Air Intake Install and Test

Today I installed and tested a Volant Cold Air Intake p/n 25846150 for the Cadillac XLR.

Install

The install is pretty easy.  A screwdriver is needed for the clamps, and a bit of WD40 or similar for the hose fittings.

IMG_2646

This is the intake setup on the stock XLR.  The air comes into the middle then flows down through openings facing the middle to dual filters and back to the middle and through the MAF into the intake.  There are resonance tubes along the way to quiet the intake.

IMG_2648

So the engine has to breath through that opening just above the filter on the left, then down through the filters 90 degrees, 90 degrees back to the center, where they turn 90 degrees to get to the MAF.  Good filter area.  The twists and turns the air takes are to prevent hydrolock in a heavy rain?

IMG_2653

Stock intake vs the Volant Intake.  The Volant has cones and large tubes for flow vs the elliptical pinched approach the OEM took.

IMG_2656

Behind the MAF was this resonator tube.  This probably captures and eliminates certain intake frequencies?

IMG_2658

The XLR MAF is a switchblade style, and has a MAF screen to smooth air flow.  I left that in place, but removed the resonator setup and air now flows directly from the MAF to the throttle.

IMG_2659

This shows the Volant in position.  The hose to the right is not attached yet, but goes from the breather hose to the intake.  It took a bit of muscle and a drop of wd40 to get the hose barb properly inserted on the engine end.

IMG_2662

Close-up on hose attachment and placement.

IMG_2665

One of the two Volant cone filters up close.

IMG_2667

The blue filter matches the blue XLR.  The hood closed fine.

IMG_2668

No trouble lights.

Results?

I have been using Virtual Dyno to measure results.  These are 2nd gear pulls so they vary from a chassis dyno which would be done in the gear closest to 1:1 which for the XLR is 3 or 4.

XLR Volant First Test 236 whp 224 lbft baro corr

[click to zoom in, back to return]

This graph shows tonight’s run in Blue, and the prior run with current tune in Red.  The runs are on different days.  Today was hotter at 95F vs 88F yesterday.  What this appears to show is that the Volant added 10 whp and 3 lbft of torque.  The blue line is clearly above the red line from around 4700 RPM up.  This would mean the 320 hp LH2 now puts out about 320 + 10/.8 = 332 hp at the crank.

The intake also had an effect on the intake sound, and the exhaust sound.  The fuel trims kicked up to around 10% each, which is another indication the MAF is now getting more air in than it expected.  I will want to adjust for that in the tune or have the MAF dialed in on a dyno.

The XLR did not show any trouble lights, and the idle is smooth as always.   The calculated hp and torque were lower than expected, so that seems to suggest that these are not predictive of real-world performance?

Please leave a Reply