Here are my updated g-tech results on a 2011 xtd cab z71 4x4 with the 6.2 and 3.42 gears running on 17” factory alloys and running in 4 auto. The fixed mods (not listed below) are diablosport diablo (92 octane) tune, ported stock throttle body, 2” leveling kit, and soft tonneau cover. I do not have a good baseline on my stock truck as I just recently learned to launch in 4 auto for better and more consistent times.

14.46 @ 98.1 mph (avg of 4 runs) with MIT & modified stock air box, NO UDP
14.62 @ 97.2 mph (avg of 3 runs) with Vararam air intake, NO UDP
14.24 @ 99.4 mph (avg of 3 runs) with Vararam air intake & Powerbond UDP
14.04 @ 100.7 mph (avg of 2 runs) with MIT, modified stock airbox, & Powerbond UDP


I have found that I also lose 1 to 1.5 mpg by running the Vararam intake so it is off for good...anyone want to buy it? (ha! ha!) I am also getting an in person Black Bear tune over the weekend (in Sacramento) so I will report my G-tech & MPG results from that as well. Don’t bash on the G-tech as it is a very good tool to compare mods. It’s pretty safe to say that the trap speeds from the g-tech are a 2-3 mph high. One more quick thing to note is that I removed my nerf bars at the same time I installed my UDP so there is probably a slight improvement from removing the 50lbs or so.

I hope that someone finds this helpful.

 

Informative and kinda confirms what I already suspected. Definitely looking forward to your results with the MIT/Modded Stock Airbox/& UDP.

 

I put the MIT and modded stock airbox back on the truck tonight. I'll give it a few days to adjust and then see where I am at compared to my previous runs.

 

Launch in 4hi not auto, its very hard on the tcase clutch packs launching in 4auto on concrete.

 

Thanks for the launch tip...wish I would have known before I made 2 more runs this morning...see updated results in original post.

My results this morning tell me pretty much what I was expecting with the MIT & modified stock airbox. The thing that blows me away is how I got about 4 tenths faster with the UDP. My only justification is that the truck comes off the line substantially quicker as the launch was/is the weak point of my truck with its 3.42 gears since the UDP gives you a little more power through the whole powerband rather than just mid/top end like most mods. There is also one more thing to note is that I removed my factory nerf bars (maybe 50 lbs) since the UDP install so that probably is worth about 1/2 of a tenth.

 

I'm guessing your air sucks out there huh?

 

I live pretty close to sea level with temps for the runs listed at 35-50 degrees so the air density for those runs is about as good as it gets.

 

The reason I ask is as u can see in my sig my truck is a ccsb and with just a tune I ran a 9.00 (13.99) and that was on a 87 tune. My brother ran a 8.90 (13.83) on denali 20's and his was on 93 tune. Both tuned with HP Tuners. Same gears, nothing different from mine but wheels. I put the vararam CAI on my truck and now I beat him by a truck and a half. So I'm guessing I will run a 8.80 or .85 now which is about a 13.70-.75. Also my truck picked up about 1 mpg with the vararam and my buddy's truck picked up 1.5mpg with it as well. I'm not by any means calling you a liar I was just comparing trucks and locations. I wonder how accurate that G-Tech is...? When will you be able to take it to the track and see what it runs? You need to bring it to Alabama!! Lol

 

Are you using 1/8 mile times to calculate your 1/4 mile times? Those formulas don't work well on heavy 4x4 trucks with the aerodynamics of a house.

The OP wasn't claiming a 1/4 mile time. He was just using the meter as a tool to directly compare a couple of mods to each other.

Just sayin...

 

Yeah, but I have seen trucks that ran in the 1/8 and their 1/4 time is almost right on with what I'm figuring. Yeah I know he wasn't really posting 1/4 mile times, that's why I was wondering how accurate that thing is. I really am impressed with the udp difference tho....! Might be something I look into with my cam/headers install... Hope I didnt offend the OP, wasn't trying to.