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For shiggles & gits...1/4 mile times on lifted 4x4s?

U

urbex

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Dad and I were recently talking about the 489 build I'm doing for the K5...I've been a 4x4 guy all my life, and Dad has been a muscle car guy all his life. So naturally, he asks "so how quick do you think it's gonna be?", as in how quick will it run the 1/4?

"Hell dad...I don't have a clue!" :haha:

So I'm wondering...I'm sure a few people here have run one of these pigs down the 1/4...mine is a '86 K5, soft top, rear seat removed, stock lifted bumpers front and rear, on 33"s MT/Rs, 4.10 gears. Currently on 10 bolts, but I'm sure they will be short lived, and tons will be under there before long. Motor should be around 500HP, going through a 4L80E/NP208.

I can easily plug weight and HP in the 1/4 mile calculators, which puts it in the mid 13s, but I don't know if lift, mud tires, and transfer case would have a huge effect on those numbers...
 
Yeah rotating mass kills speed

But I have seen a propaned D max run in the 10s at altitude
 
I would be amazed if my crew cab was under 30 seconds. A 1/4 mile calculator thinks my blazer can do it in 18 sec, I highly doubt it. 37" tires that weigh 200lbs a piece are not made for acceleration.
 
Years ago I took my '70 K10 to the track here. Elevation of 4800' (IIRC) It had the 33" BFGs at the time, 4:56 gears with a 700R4. The fat block still had the Crane hydraulic flat tappet cam with the stock bore for a 454. It pulled a 16.18 at 83 mph.
I keep thinking that I should take it back sometime, but I haven't had the C10 back there since it got some upgrades, so it should go 1st.
 
Just an FYI, speedview is a free app (non-pro version) that will do 1/4 and 0-60 times (along with everything common, like speedometer, distance and time driving, etc) so if anyone is interested in trying their own out, at least its free. One review of another phone app showed accuracy to about a half a second in the 1/4 mile, or about 97%, which is plenty close for what most of our rigs will run I'm guessing. lol

I don't have anything close to run a flat 1/4 mile on, but the speedview app showed my 0-60 at 13 seconds on the one run I was able to make. Really don't realize how hard the 465 is to shift until you try and do it for time. Also realized this thing is hard to get rolling (quickly, from a stop) without slipping the clutch excessively or letting out too quickly. 350 (TPI), 33's, 3.42's, and the 465 in a K5 don't make for an off the line performer from what I'm seeing.

Edit: Got a lucky break to test the 0-60 again in a safe place, hit 11 seconds flat. Think I could probably get it down to high 10's if the planets aligned and I could get a good start, not slip the clutch, and hit the 1-2 shift right. I shift about 30MPH in 1st, not sure when I should shift out of 2nd, but I have been around 55. I might try and hold it to 60MPH, see if that would help. I doubt it's got 10.5 in it. Interesting math in this, this 0-60 indicates the HP is ~200 at the crank, which seems obscenely low given that the L31 is rated for 255HP. One would hope headers and TPI would help not hinder!
 
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When mine was completely stock except tires, it ran 17.4 in Denver
350 465 with 31s on 3.73s
 
Out of curiosity I looked up some claimed 1/4 mile times for newer stock trucks. Found this site: https://www.zeroto60times.com/body-style/pickup-truck/
At a quick glance it seems like most gas powered new fullsize trucks are running in the 15-16 second range in the 1/4 mile. The factory ratings on those engines are typically mid-300 to low-400 HP range. Granted, I always take information like this with a grain of salt but it does sound reasonable. Bent77 stated his rig (assuming the '77 K10 in his sig) ran 17.4 seconds when stock which again sounds reasonable compared to the stated new truck times.
 
6.2Blazer said:
Out of curiosity I looked up some claimed 1/4 mile times for newer stock trucks. Found this site: https://www.zeroto60times.com/body-style/pickup-truck/
At a quick glance it seems like most gas powered new fullsize trucks are running in the 15-16 second range in the 1/4 mile. The factory ratings on those engines are typically mid-300 to low-400 HP range. Granted, I always take information like this with a grain of salt but it does sound reasonable. Bent77 stated his rig (assuming the '77 K10 in his sig) ran 17.4 seconds when stock which again sounds reasonable compared to the stated new truck times.
Click to expand...
I’m curious about the link @dyeager535 posted

I may try that
 
When I still ran my '79 K5 on the street with the blown 454 in it, I thought about taking it to the track to see what it would run.

One quick call squashed that idea when they told me that the NHRA has some type of rule about lifted vehicles.. something about the center line of the crankshaft couldn't be X number of inches from the ground.

my 6 inch lift with 44" tires put me over the limit..
 
I haven't taken mine to the 1/4 mile due to it not being too fast for its roll cage. I probably need a "funny car" style cage.
Here is a time slip from doing sand drags.
20180505_010806.jpg
 
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JDNobodi said:
I haven't taken mine to the 1/4 mile due to it not being too fast for its roll cage. I probably need a "funny car" style cage.
Here is a time slip from doing sand drags.
View attachment 302582
Click to expand...

I don't know anything about sand/dirt drags but a 1.4 60' on asphalt is respectable.

edit- and I'm pretty sure if I rode in your K5 I would have a new expensive hobby.
 
I tore up to many parts in the 60's to still want to drag race but there is no way a lifted truck on anything but 1 ton axles and solid crosses on the ujoints could survive a launch. my son't 500hp sti with awd was a true experience trying to launch a car meant for road racing. the same goes for offroad/street 4x4's 4:56's probably a minimum and high stall or feathered clutch maybe but pretty ridiculous in my opinion. I have a 63 j200 that got a 350 crate motor with the 350/350 cam in 1980, it started out with the low ball adapter for the 3sp jeep tranny then a 4 speed saginaw car tranny with adapter to the xfer case. It could scratch rubber in all three gears on 31's with the stock 4:09 gears but was not a drag vehicle by any means, The only thing I remember outrunning on the stop light drag was a newer 280z. It finally got a turbo 400 with the 205 transfer case and was truly reliable then. My 86k5 with a 350 tuned ramjet and multiple 700r4's broke two 10 bolts and now is trying to survive a built 12 bolt on 32's. I have never actually enjoyed burning rubber in any of my toys so that was never a thing just normal deep fast pedal stuff. with a 3:42 rear axle it will hit the fuel cut at 5600 in drive with 32's. too fast on pavement lifted. New trucks with 400hp set up for towing will probably be a real challenge for the older iron toys. I recently got educated by a lifted diesel on the highway at speed so my expectations have changed considerably for my gas toys. A few years ago on a trip to dallas to play with the go carts a diesel truck challenged my son in his sti and that was the first time a diesel became apparent to me to be a highway toy. he just thought my son's car was average but still he aparrently had never been beat on the highway by a rice rocket or he would not have gone as far as he did. My ins guy has a built duromax with late ford straight axles and it might be a drag prospect as car dragging was his forte in the 90's. he has a video of it on pavement with smoke coming from all 6 tires. Lots of money in that toy.
 
My old 84K10 I got it to run low 14s but it was stripped down to nothing and I ran it with 31" car tires on it. Trapped at 99mph. 33" TSLs added almost 2 seconds.

My 5500lb 2015 half ton with 6.2L/8 speed is way faster.
 
I’m never went to the track with mine but I’d guess 30 seconds. Lol. It was never built for speed. 355 465 205 with 410 axles and 35s ain’t going very fast down the track. And the coast to coast shift pattern in the 465 definitely don’t help.
 
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