95' Junker Drag Truck

It looks like the cat is out of the bag, yes I did finally break into the 10's. Quickest pass of the day was 10.902 @ 125.75 mph; fastest pass of the day was 10.957 @ 126.10 mph. I did cheat on the fueling setup and swapped out the DDP 024 DV's for a set of my 025 Comp Cut DV's. Everything else as far as fuel, timing, & turbo setup were the same. It has a medium haze at full boost so I think I will pick up a little more power with more added timing.

Junker1090Timeslip_zps95b6b4b0.jpg


The fastest two 1/8th mile passes, never did see a 6.x 1/8th mile:
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The 11.56 ET run was aborted early due to a blown boot. It was the first run of the day and on it's way to 10 seconds as well.


On my previous seemingly low boost numbers, my high pressure gauge line was cracked and finally completely blew off so after fixing it, I was able to get new boost numbers.

Peak boost is ranging from 80-85 psi (Still Down 5-10psi over the previous stock head/cam/piston setup), interstage boost was in the 40-45 psi range before the delivery valve upgrade. At the track with the upgraded comp cut delivery valves, boost ranged from 60-65 psi.
 
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How does the truck drive now? I know its not the point, but does it feel like you could daily drive it?

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Video of one 10.95 pass, the new DV's could probably use a little more timing, it's still set at 26*, same as it was before the recent engine work/motor build.

[ame="http://www.youtube.com/watch?v=Ef9B63yl_g4"]http://www.youtube.com/watch?v=Ef9B63yl_g4[/ame]
 
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[ame="http://www.youtube.com/watch?v=_uPHDS4hsIs"]http://www.youtube.com/watch?v=_uPHDS4hsIs[/ame]
 
that ugly-ass blazer was moving along in the first video.


Excellent progression of the build!
 
Only one post off topic but I've seen that blazer in several west coast diesel racing videos. IDT he's online but it's a cummins conversion. It's sprayed. But VERY much a sleeper!!
 
Congrats on the times, bet it feels pretty good to have it running again.

Do you have any idea if what you have total into the truck now after the full rebuild?

Matt
 
Joesixpack said:
If it lowered boost it sure likes lunching boots. Great running truck.
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The first time it blew the 3" to 3.5" transition boot where hot-side charge air pipe enters the stock charge air cooler. The first pass that coasted to 11.65 was pushing 85 psi total. I opened up the internal gate on the He351 a little more to help lower total boost in hopes of reducing the boot blowing fiasco's. I also added a tie-wire make-shift brace to prevent that connection from spreading. It's my fault, I never added a rolled bead or weld hump on that connection because the pipe extends roughly 3" into the boot and I figured there wasn't enough space for the plumbing to move back far enough to blow off. Apparently the charge air cooler mounts can be bent forward with 85 psi which opened up the gap between the top turbo and charge cooler inlet just enough to allow the pipe to back out. In street testing, I never had a failure but I also can't run it full power with street tires or exceed the speed limit.

The second and final failure was during the burnout contest and the same connection failed. It tore two strands of steel tie-wire in tension and the sudden loss of boost combined with converter locked in overdrive with my foot on the brakes stalled the motor before I could get it bumped into neutral. For the 35 seconds of the burnout, boost peaked at 80 psi, interstage boost peaked at 65 psi, RPM peaked around 4500-4600 (guessing by how far it wrapped the needle past 4k) for a calculated wheel speed of 181 MPH!!

murphy41 said:
Crowds reaction is still priceless every time. Haha Truck runs great. Was excited to see both junker trucks make passes today. TTR21 and Wills truck.
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Thanks, I know TTR21 and I were both happy to see 10's.

TTR 21 said:
Nice to finally meet you boys face to face. Had a great time and was stoked to see that thing hit 10s. Congrats man!
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Thanks!!!

JQmile said:
Congrats on the time will! 10's is no joke!
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Thanks, that means a lot coming from someone that used to fly/drive around the country reporting on diesel events!!!

spoolinawd said:
Congrats, you definitely worked for it.
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Thanks!
 
Texashighways said:
Keep it up!!
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Thanks Zach, I really like the improvement in the sound and power of the motor in the 3000+ RPM range. That cam and dual valve spring setup seems to really compliment the mild port and polish work on the head. I know in past burnout competitions spinning smaller 31" tires, I could not get over 4200 rpm and it seemed like the motor sounded like it had valve float at high boost and anything over 4000 rpm with the previous 60# spring setup.

madmikeismad said:
How does the truck drive now? I know its not the point, but does it feel like you could daily drive it?

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The truck drives excellent.... other than the welded rear is wicked scary on wet roads, the harshly tuned valve body that shifts 1-2 at 3000 rpm regardless of throttle position (which usually chirps or barks the tires), and the touchy throttle from the tight 5.5K governor springs results in bucks and bounces in lower gears while lock-up is engaged during around-town driving.

As far as smoke, spool-up, power delivery in general, 100% streetable (and so nice, I'm strongly considering putting this twin setup in my daily driver when the day comes that I need more air and construct the S363/HT80 new compounds.

diesel_importer said:
Awesome times, Will! Looks like your hard work paid off.
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I have to admit, seeing improvement is what drives the cheap innovation. Sometimes its easier to write a check and order new pistons vs. checking ebay for a month straight to find used pistons, spend countless hours on an under powered lathe cutting them, all to save a few hundred bucks. Luckily there was improvement and now more motivation to push the truck even faster.

Hurley said:
that ugly-ass blazer was moving along in the first video.


Excellent progression of the build!
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Yeah, he has that 12v Cummins conversion wound up tight and dialed in!

I barely nipped him on the topend by 3 hundredths, it was a close race!


Drothgeb said:
From the time slips, it has an awesome top end.

Good job!!!
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Yeah, that fuel pressure really is important on these 160 pumps. The time slip calculation software out there still shows it should be running a little higher trap speed but overall, it does charge pretty hard on the top end.
 
Big Blue24 said:
I have to admit, seeing improvement is what drives the cheap innovation. Sometimes its easier to write a check and order new pistons vs. checking ebay for a month straight to find used pistons, spend countless hours on an under powered lathe cutting them, all to save a few hundred bucks. Luckily there was improvement and now more motivation to push the truck even faster.
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This is one of my favorite threads on this site, and the part with all of the piston mods is my favorite part. Really awesome to see you having success with it!
 
It a 84 Blazer that's sitting on a shorten 95 RCLB Frame. It's still 160 pumped, with 5X .016s, Schwitzer S360 with a .8 Housing and a Box stock S475 on a 1.10 housing. He sprays small jets occasionally. He has one of the cleanest burning 12 valve setups that I've seen, and it's his daily driver...
 
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