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Jesse OBrien

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Jesse OBrien last won the day on September 6 2016

Jesse OBrien had the most liked content!

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About Jesse OBrien

  • Rank
    Member
  • Birthday 10/28/1983

Contact Methods

  • AIM
    drummingpariah
  • Website URL
    http://www.driven-daily.com
  • Yahoo
    drummingpariah
  • Skype
    drummingpariah

Profile Information

  • Gender
    Male
  • Location
    Manchester, NH
  • Interests
    DevOps and hill climbs.
  1. Driven Daily Hillclimb 2016 Build

    Still just "Taking the piss" ... but I have more cardboard, foam, and fiberglass to make sure everything fits just so.
  2. Wheel size for handling

    Yeah, it's taken awhile to get some first-hand experience together, but after a few seasons of hillclimbing and autox here's what I've learned: I ran my Miatas with an array of tires, starting with Kumho XS in 205 width on stock tires. Then I went up to 15x8 on 225-50R15 DOT tires. Those went on my na8 Miata, and I decided to bump up to the new 245-40R15 DOT VR-1 tires from Maxxis (mostly for the gearing improvement). After some mounting issues on my 15x8 wheels (they really belong on wider wheels), I settled on 225/45R15 v720's for the 1.8liter Miata. When these 15x13 m28 throwaways came with the box truck I bought, I was absolutely blown away by how lightweight they are. Spun wheels are similarly inexpensive, and I can get qualifying take-offs cheap through a hillclimbing friend. That seems like a good reason to give them a test, I'm a big fan of reducing unsprung weight while increasing mechanical grip. The 10" wide would probably be a better idea for what I'm doing, but we'll cross that bridge when I actually purchase tires.
  3. Driven Daily Hillclimb 2016 Build

    I'm just going to leave this here. Tire fitment mockup (27 tire diameter, 13 tire width, 15x15 wheel):
  4. Driven Daily Hillclimb 2016 Build

    It's been pretty quiet around here lately, so here's a new episode for you fellows.
  5. Driven Daily Hillclimb 2016 Build

    I like the lights in the box roof. Right now, there are 21ft of LED strip in there, of which around 15ft still work after being abused quite a bit. I had always planned to update the wiring for them when I removed the plywood on the walls, so I only did a temporary zip-tie installation. Instead of updating this installation, I thought I'd go for something a bit more modular ... and add a bit more lighting as well. Fast-forward a bit of measurement and math, and I've spent around $50 buying lighting replacements. The end result is 10 1meter strips that fit together pretty much perfectly. The aluminum channel acts as a basic heatsink, the lights are insulated from shorting out on it, and the light is diffused (not a lot, but it's enough). The aluminum channel makes them rigid enough that they could easily be moved and installed elsewhere at an event. I still need to consider how I want to mount them to the roof spars (ideally to the canopy, on jackstands, etc as well), and solder on the XT-60 connectors I've standardized on ... but this represents a serious lighting upgrade. To support that upgrade, I've added another group65 battery to the box truck. Each group65 battery is rated for 85aH, so that's around 2000 watt-hours (not counting the box truck primary battery or generator for recharging). With all of these lights running at the same time, they draw a little under 200w ... giving me around 10 hours of continuous use. I'm definitely planning to run some other accessories on these, so the generator is still a must-have, but that's pretty promising. That 365mm is EXACTLY what I'm looking for. Is the 205mm the lowest surface of the corresponding front mount?
  6. Driven Daily Hillclimb 2016 Build

    I spent some more time working on my box truck today, and removed the remaining murderwall plywood then reorganized, straightened, and bolted down everything else back there. The etrack on the floor will probably end up on my trailer, but it could make its way to the walls after I've insulated and recovered them. We'll see how it plays out, but either way I love that stuff. The driver's seat is finally getting replaced. I don't know if I already mentioned it, but the roofing tar in this thing got EVERYWHERE. The seat was disgusting. My favorite caption I've seen so far:
  7. Driven Daily Hillclimb 2016 Build

    The rear subframe is crudely jigged together, and should be ready to rock in the morning. Centering it, defining my ride height, and setting the pitch required a lot of braining. Based on the measurements from a friend, the LCA should be at a ~14 degree layback. I'm at 13.75 degrees on both sides, and have decided to call that good. At some point, I'm going to move the arm pickup points anyway, so this'll have to do to get me started.
  8. Driven Daily Hillclimb 2016 Build

    I've been banging on the rear suspension quite a bit, building a new jig and chopping bits out. I'm not quite ready to start welding things together, so here's an update on my race support vehicle instead. We finally scrapped the murdervan-themed overhead door. We replaced it with some steel-framed swinging doors, which are mostly-good. I didn't realize that this latch was designed to be per-door, not shared across the two. It works for now, but I really need to add a second set of lights. I'll probably add a ridge around the edges of it though. One of the best things about it is that the doors swing ALL the way open (270 degrees) to sit flush with the sides of the box. Pretty snazzy, I'd say. Swapping the doors negated the need for the overhead door tracks, which negated the need for the murdervan-themed plywood lining the insides. I removed one of them so far, and have started reorganizing a bit. One of the headlights died too, so I decided it was time to upgrade to LEDs. Definitely a worthwhile investment. Finally, the interior dome light had died at some point, and it was time to replace it. Rather than installing a new mouse-graveyard though, I thought 1/4amp worth of LEDs would be more reasonable. The result: I could probably skip having headlights now. It's pretty sweet. I'll have some more updates coming over the next month or so, but the more chatter that happens on here the more I'll remember to post. I can't wait for the 2018 race season, and really want to have my support vehicle 110% situated for it.
  9. Gollum's DD L28ET 75'

    Don't lose momentum now!
  10. You're a rock star, thanks for sharing dimensions on that rear subframe for me! Cheers!

  11. Driven Daily Hillclimb 2016 Build

    That 365mm is EXACTLY what I'm looking for. Is the 205mm the lowest surface of the corresponding front mount?
  12. Driven Daily Hillclimb 2016 Build

    Extremely helpful. Even better would be measurements to the bottom of each subframe-to-chassis mount. That would give me the angle of inclination as well, which would be SUPER helpful.
  13. Driven Daily Hillclimb 2016 Build

    We have some catching up to do, but the video series is finally getting edited now! https://www.youtube.com/watch?v=yMzfChavIsg
  14. Driven Daily Hillclimb 2016 Build

    We've been hard at work getting ready for 2018. The Datsun needed the rear wheel centerline moved back 4" in order to clear the main hoop position. I finally made time to mock up where everything should sit, and finish the rear quarter panel profiles. I think it still looks like a 'natural' location for the rear wheel. This gives me around 6" of ground clearance with the suspension preloaded, which is perfectly acceptable in my mind. Using 300lb/in springs, that would give me 1500lb of load before things start to go a little wonky. With the pushrod setup that I'm planning on, I can tune it to dynamically increase spring rate toward the 'compressed' end of the cam travel too. The cardboard template is reversible, so I can accurately reproduce the profile on the opposite side ... but I may modify the overall shape a bit before pulling a mold. This configuration puts the fender line quite a bit higher on the body, and I have the option to move it higher or lower if I don't like the way everything sits when finished. I'm putting off welding the rear suspension in until I have better calculations on what the static ride height needs to be with the stock control arm geometry. I'm probably going to have to move the subframe up a bit in order to keep the ground clearance I talked about earlier, and I can just chop off the OEM front mounts and weld it directly to the X brace if that's the case. It's good to be working on this again.
  15. Driven Daily Hillclimb 2016 Build

    I ended up winning the P4 class for the year in the Miata! Philo was a great time, and the weather was incredibly good. The only problem I had was that CXRacing exhaust manifold. Several of the welds completely failed, and now I need to make a new exhaust for the Racing Beat manifold I bought to replace it. The $400 one lasted one race, and a friend has been racing for two seasons on the $150 RB model. Figures. Now that the season is finished, I'm working on minor prep jobs ... like heat/defrost, winter tires, etc. The real goal for the winter is to finish up the box truck and get the Datsun ready to race in Spring.
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