View Full Version : GD3 Air Runner Suspension

12-08-2009, 07:04 PM
Here's the install....

4 gallon pancake tank and a compressor mounted in the spare tire well. The compressor is wired to the ignition with a 120-150 PSI pressure switch in the tank wired in line, so the compressor kicks on when the pressure in the tank drops below 120 and it shuts off when the pressure gets back to 150, only when the car is on.


Front struts are the same as stock with an airbag instead of a coil spring



Rear shocks are replaced with KYB Lower Sports, and a Firestone 9001 bag replaces the spring. The Air Runner kit comes with all the hardware to make the bag work in the stock rear spring perches


The lines are 1/4 inch, with manual valves and analog gauges. I went this route because it's my daily driver, and figured electric valves and digital air management seemed like more stuff to fix. The valves (switches) and gauges are mounted in the center console, so all the lines had to be run there


More next post...

12-08-2009, 07:15 PM
Now for the wheels. I'm running 18x8 +32 XXR Style 504 with Toyo T1R's 205/35R18's. Yes they are stretched a little bit, but if you check out Toyo's spec sheet for the tire, the max rim width for the tire is 8 inches. The rear fenders had to be pulled about 3/4 of an inch, and the sheet metal behind the bumper had to be cut out. The mounting tabs and inner lip on the bumper had to go





I was able to squeeze an Optima D51R instead of the 151R to handle the extra load of the compressor and audio system


Oh yeah, I forgot, here's where the emergency fill valve is in case the compressor ever quits. I have one of those little emergency ones that plugs into the acc socket in the console


That's pretty much it



12-08-2009, 07:18 PM
Boy, is this place different from the other site and "help me unlock my doors" posts. Thanks Mark- we are looking forward to the rest of your info!

12-08-2009, 07:20 PM
You forgot to tell us your source(s) and total cost. ???????

12-08-2009, 07:30 PM
MSRP is $2999. I got it direct from Air Runner. They cut me a pretty good deal since that car was in Lund International's SEMA booth in 08

12-08-2009, 08:17 PM
MSRP is $2999. I got it direct from Air Runner. They cut me a pretty good deal since that car was in Lund International's SEMA booth in 08
Well, once again, VERY nice work!!!

12-08-2009, 11:36 PM
Nice write up. While lowered cars aren't really my cup of tea at least using this set up you can raise it enough to drive it without smashing up your oil pan.

12-08-2009, 11:40 PM
Forgot to ask did you replace the shocks with your new kit? Did they come with the package if you did? Have you found any problems with the shocks you are using with bottoming or toping out?

12-09-2009, 05:02 AM
Yes, the Air Runner kit came with "Lower Sport" shocks from KYB, you can see them in the picture of the rear bag, they are yellow.

I don't really have any problems with bottoming out, as my everyday ride height is only about 1.5 in lower than stock. They feel a little bit stiffer, but I can't really tell. The cool thing about this set up is that by increasing the PSI at each corner, I am, in effect, changing each "Spring Rate".