Just got back from time trials on a stretch of dry highway south of town.
Outside temperature was 50 F.
3/4 of a tank of gas
The first few runs were difficult. It took a while to heat up the tires. All it would do is smoke and spin the tires all the way thru 1st gear.
Once I got the hang of it.....whoa.
...the times surprised the hell out of me.
For such a heavy car, it scoots along pretty good now.
I checked the cone and inside the CAI box after a lot of heavy running and it stayed a cool 60 F...(55 F at the end facing the fender openings).
I call it a box but of course it is only formed out of reflecto bubble insulation and aluminum tape. Matches my Silver car quite well. I also wrapped the 4" PVC pipe feeding the throttle body.
Before the Cone CAI mod, I was able to accellerate to 60 in 6.9 sec....the 3.4" pulley (30 hp) and flat style K&N (5 hp) accounting for the big gain over the original 7.5 sec time.
With the cone conversion alone the time dropped to 6.8 but when I measured the temperature at the cone it was a whopping under hood air temp of 135 F.
So I fabbed up a quick heat sheild using the reflecto wrap and dropped the cone temperature to around 85 F.
The time dropped to 6.7 sec.
Last week I did two further improvements.
I removed the MAF screen and did a better job of sculpting the box to seal it completely from heated underhood air. It mates nices with the underside of the hood. It now draws all of the air thru the 4 1/4" and 3" openings in the fender.
The results are as follows:
0-60 times ranged from a best of 6.4 to a worst of 6.6 sec.
I am bragging 6.5 sec
0-80 time of 11 sec
0-90 time of just under 14 sec.
So you do the math. What power gains to achieve an improvement of 2 tenths for a 3800 lb car
The improvement from dropping the inlet air temp from 135 to 60 F is worth 7.5% of 270 hp = 20 hp by itself.