95' Junker Drag Truck

So the cat is out of the bag, I did get a new personal best with the ET Drag Slicks:

11.73 @ 119.05 MPH

This pass was the maiden voyage on the drag slicks so I set the pressure right at 17 psi for the sake of top-end stability, unscrewed beads rolling or sliding, and flat out fear of the unknown. I took it easy on the launch, built about 4-5 psi boost.

60' - 1.9649
330' - 5.1541
1/8 - 7.6874 @ 97.53 MPH
1000' - 9.8026 @ 111.3 MPH
1/4 - 11.7356 @ 119.05 MPH

Timeslip310121173.jpg


[ame="http://www.youtube.com/watch?v=UifxSChuf5A"]http://www.youtube.com/watch?v=UifxSChuf5A[/ame]


The next pass I took it easy, trying to leave softer and get dialed-in closer to 11.90. I ended up leaving too soft and did a 2.30 60' and 12.37 @ 116 MPH on the brakes the last 15-20' of the track to ensure I got one pass above the index.

My reaction time was horrible with the soft launch, so i decided that leaving moderately aggressive and hitting the brakes at the end of the track was going to be the best strategy for running the 11.90 index.

I let the slicks down to 16.4 psi and built about 6 psi of boost. That run resulted in a 1.88 60' time and a great 7.59 @ 96.9 MPH 1/8th. I then got on the brakes really hard and slowed it down to a nice:
11.99 @ 89.53 MPH.

[ame="http://www.youtube.com/watch?v=6tsXE4Wq0jA"]http://www.youtube.com/watch?v=6tsXE4Wq0jA[/ame]

The next round was against a well-built 4x4 Dodge that had managed several 12.1-12.2 passes and the driver was really good on the tree. I tried to leave with about 4-5 psi and really focus on my reaction time since I new the opponent was capable of .1 second reaction times. I ended up fender racing him from 1000' on and took him by just 0.02 seconds at the finish line. This strategy worked well because my truck had a lot better power to weight ratio than my opponent.

My next run was a bye so i just loped down the track at a slow 16 second ET.

My final pass was against last season's world champion Verlon Southwick. Last year at this very same event, he took me out in the first round with a holeshot win. Well, he treed me pretty good but his truck started falling behind at 1000' and so i let off to try to fender-race him because I knew he was capable of running less than 11.90 and I didn't want to break out. He was playing with me and I wasn't spooled up when he got back on-it. Needless to say, it was close but I couldn't get back around him the second time and lost by 0.0581 seconds. Had I stayed in-it the whole pass I would have broken out and automatically lost. It was a lot of fun and I ended up taking home 3rd place in the Super Diesel class. I had a fast enough truck to win, just didn't have enough skill as a driver to pull-off the win.

Timeslip310121209.jpg
 
Nicely done sir!
As the walmart man asked, u coming to ennis next month?
I want to race you!
 
The burnout contest was fun. It was a lot longer than last year, they let us go for about 45 seconds this year but the wind kicked up and the smoke didn't linger like last year. I burned them down to the steel belts but didn't get a tire failure/explosion. Also, I was only able to get 4200 rpm out of the motor for a tire speed of 156 MPH. Needless to say, I didn't win the $1000 cash pot.

Here's a video of the burnout:

[ame="http://www.youtube.com/watch?v=5DR41DG_nk0"]http://www.youtube.com/watch?v=5DR41DG_nk0[/ame]

Here's a short video of the tires aftermath:
[ame="http://www.youtube.com/watch?v=ujHjRQMp1V4"]http://www.youtube.com/watch?v=ujHjRQMp1V4[/ame]

And a few pictures:

Burnout1.jpg


Burnout2.jpg


Burnout3.jpg
 
I wanted to also provide a little analysis on my top-end defueling issue....I still have one.

My stock mechanical pump makes 64 psi at idle. My stock mechanical plus the Holley Black Knock-off pusher pump makes 85 psi at idle. When i turn on my third lift pump, the Walbro 392, it will instantly make 115 psi at idle.

The triple lift pump setup will maintain 80 psi through the traps at 119 MPH.

During the long burnout contest at 4200 rpm, the triple pump setup was maintaining 65psi, so I think the stock mechanical pump struggles at high RPM and the Walbro picks up the slack.

I have a new probable culprit for the defueling and it's something very basic, I think I need to tighten up the 5.5K governor springs. I'll have then adjusted tighter before my next outing and will hopefully be able to get better 3200+ RPM fueling.
 
RJM06590 said:
How much timing are you running?
Click to expand...

26*


The reason I used to think my governor springs were plenty tight is it was two clicks away from running away. It used to idle around 1150 regardless of how low I set the idle screw.

Two days before this most recent race, I had to change the throttle cable because it was frayed and just about ready to break. After changing the throttle cable, the idle was so low it wouldn't run period. I had to adjust the idle screw a lot to make it idle after the new throttle cable.

My theory is that the old throttle cable was too short or somehow hung up a little due to the frayed end. This made me erroneously assume my tightened governor springs were maxed out and could not be adjusted tighter. I'm going to tighten up the governor springs a few more clicks now that I can set the idle low and see what kind of RPM I can get out of it.
 
I still never saw you have traction issues....you need to hit a test and tune in Vegas for a big NHRA or PSCA race where the track prep is good. It will be worth a tenth or two for sure.

Good seeing ya again man!
 
Makes sense, my 4k kit will fuel hard to 4100 and stop around 4260. Current timing is 20*, stock cam and ported head. Once I get titanium keepers and better springs ill tighten them down another click.
 
BigBlue, what's your current total investment in the truck's fuel system? (Not harassing, btw) It seems to me you would be better served for a single pump & regulator system capable of handling your current fueling needs, no?
 
JQmile said:
I still never saw you have traction issues....you need to hit a test and tune in Vegas for a big NHRA or PSCA race where the track prep is good. It will be worth a tenth or two for sure.

Good seeing ya again man!
Click to expand...

You're right JQ, I didn't have a single traction problem the whole race. My best 60' was with a 6 psi launch with 15.4 psi in the slicks against Verlon in the semi finals: 1.86

I think the truck would have run 11.6 on that run if I had stayed in it the whole pass.

If I had to guess, it felt like it would have held a 9-10 psi launch probably 1.75 60', no problem. With that kind of 60' and 97-98 MPH in the 1/8th, that comes out to an 11.2x quarter mile time.
 
Hurley said:
BigBlue, what's your current total investment in the truck's fuel system? (Not harassing, btw) It seems to me you would be better served for a single pump & regulator system capable of handling your current fueling needs, no?
Click to expand...

New stock mechanical $100
Holley Black Knockoff $50
Walbro 392 $102
Fuel lines, fittings, electrical $100

Roughly $350-$400 total in the lift pump system.

I don't think there are many single lift pumps out there capable of flowing 100 GPH at 85 psi. I'd love to try one, but I'm pretty deep financially into my current lift pump system so I'll stick with it for the time being.
 
Big Blue24 said:
If I had to guess, it felt like it would have held a 9-10 psi launch probably 1.75 60', no problem. With that kind of 60' and 97-98 MPH in the 1/8th, that comes out to an 11.2x quarter mile time.
Click to expand...

pinion brake pinion brake pinion brake........:bangLOL
 
JQmile said:
I don't think he has that much traction!
Click to expand...

Then it is time to get to work fixing that as well. This truck is making some power and mph but if you don't get that 60' well..........

Launching at 5-6 psi or whatever is not going to promote good times due to not being able to get this truck up out of the hole. In my honest opinion I would put a pinion brake on this truck which the OP is more than capable of given the ingenuity displayed and then start working on the 60' via shocks, his traction bars, etc.
 
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