Originally Posted by daveb
I would like to see a picture of Zilstra's air dam.
Anybody got one?
I plan to do the air box before summer and if the scoop looks good I'll have them do that as well. But I still want to address the trany temp issue during steep climbs at slow speeds. That is where I run close to 220 not when cruising at 50MPH
I had zylstra do the air box mod and the air scoop for me on Friday. They have a nice facility and it was a good experience. I told them in advance that I had a time constraint and had to be on the road for home no later than 2pm. Left home at 445am, pulled into their lot at 8am sharp and they started to work on the van by 815am. The airbox mod is an interesting design that they created. That was a lot more labor intensive than the air scoop. The scoop was attached between the front leaf springs to direct air upwards.
I worked all day in the van while they worked away outside. They finished the work at 130pm and off I went for home.
The mods did cause a change in my operating temps and performance. Modest, but noticeable and not exactly in the way I expected.
Outside air temp on the drive home was in the low 90s. Intake air temp was 92-94 all the way down hwy99 till I hit the grapevine. That strecth is flat as a pancake and I was doing 65mph with the AC on the whole way.
The mods helped drop my average
operating temps by a modest 10-15deg versus where they were on an identical drive home a few weeks ago. The water temp fluctuated between 205-215deg the whole way and it took a much longer 12-15min or so to cycle between the low and high ends of that range. On my prior drive, once the fan kicked on and knocked down the water temp, it would be back up at 215 within a minute or two. The tranny temp fluctuated in a very tight range of 180-185 the whole drive, versus 195-205 on the prior trip.
So, better, but on average not as much as I anticipated.
There was a more noticeable difference in my peak
temps, however. Not sure why, but there was. Climbing the grapevine (with both AC and overdrive turned off), I pulled the hill comfortably at 50-52mph, versus 45mph or so on the prior drive. I assume that was due to better airflow into the motor. My peak observed water temp on the climb was 216deg. My peak observed tranny temp on the climb was 192deg. Outside air temps were low 90s. That seemed pretty good to me. On my last drive, scangauge showed peak water temps of 225deg and tranny temp of 212deg.
As always, my experience is just one anecdote. But all in all, I'm glad I had the work done. Every little bit helps.