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Lethalcast's 09 lnf g85 Goblin build!

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Lethalcast's 09 lnf g85 Goblin build!

Old 06-20-2018, 04:35 PM
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Lethalcast's 09 lnf g85 Goblin build!

So it all starts with me "researching" kit cars haha. I've always liked the idea of building something fast. I found dfkitcar through watching YouTube videos and was instantly hooked. I loved the idea that it uses a cobalt as a donor so my next step was to find the perfect one! I looked for quite a bit and almost got an 08 lnf in s.c. but ended up not bidding on it and I'm so glad I did. Not too long after a beautiful red 09 lnf with 68k was coming to auction. It took almost two months for them to get the title so they could auction it. I figured it was going to go crazy high since it was online for everyone to see. The auction day came and I ended up getting in a bidding war with someone that was located close to me but in the end I won! The price was just over 2800 after fees and I was super excited. I went right to Orlando to picked it up. Got home and it wouldn't start, someone left the key on. Threw a different battery in it and it started right up. I of course had to take it out for a spin lol. I was surprised how quick it was being all battered and beaten on the drivers side haha. After burning some rubber off the tires it was time to order my kit! While waiting for it to arrive I started on the tear down which surprisingly only took 3 days. Everything went really smoothly and all the parts cleaned up nice. Stage one of the kit has just arrived a week ago and it's already at the powdercoater! Here's some pics of the car and the progress so far and I'll continually update as things happen!
Shes home!














The frame color! Could the name be any better? Lol
I threw some seats in it because of course i had to sit in it lol

Off to powdercoat!

Last edited by Lethacast; 06-20-2018 at 04:53 PM.
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Old 06-20-2018, 05:08 PM
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Looks good! Good luck with everything, these look like so much fun.
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Old 06-20-2018, 05:12 PM
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Thanks Slow! Ya I'm super pumped about it! Theres a few videos online and one person has a lsj hes doing autocross in and it looks like a blast. https://youtu.be/Alb_zNWEmZA
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Old 06-20-2018, 05:31 PM
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Ive seen that video before. Thing looks insane for having such light mods.
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Old 06-20-2018, 05:32 PM
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Ya seriously, I'm looking to have mine done before summer is over!
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Old 06-20-2018, 05:32 PM
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I like the frame color, what you going to go with on the body panels?
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Old 06-20-2018, 05:42 PM
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Nice, good luck on the build.

Is it just me or does it look like the driver side seat is leaning towards the door as if it was bent in the accident?
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Old 06-20-2018, 05:46 PM
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Everything else is gonna be black textured like my truck but the panels I'm not sure what I'm gonna do yet but they'll be wrapped. The seat was fine and it's just sitting in that frame and may be why it looks like that
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Old 06-20-2018, 05:49 PM
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Originally Posted by Lethacast View Post
Everything else is gonna be black textured like my truck but the panels I'm not sure what I'm gonna do yet but they'll be wrapped. The seat was fine and it's just sitting in that frame and may be why it looks like that
Thats what I was hoping was the issue.
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Old 06-20-2018, 06:07 PM
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Hopefully you store the car inside the sun will eat those seats really fast
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Old 06-20-2018, 06:18 PM
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Originally Posted by Snail_SS View Post
Hopefully you store the car inside the sun will eat those seats really fast
O ya it will be stored in the garage and I wont actually be using those seats!
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Old 06-20-2018, 06:22 PM
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That was a steal of a price.
Are you sure it was just a GM stage tune? the upper charge pipe was not stock so I would guess it was tuned further. Regardless, you'll definitely want it retuned when you get it running so just be prepared for that.
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Old 06-20-2018, 08:08 PM
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Should also throw a f40 trans with lsd while your at it
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Old 06-20-2018, 08:10 PM
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Originally Posted by zeeky420 View Post
Should also throw a f40 trans with lsd while your at it
Ya theres another builder that did that and had to modify a bunch to make it fit
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Old 06-20-2018, 08:21 PM
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Would be overkill I would think due to less stress on the trans moving 1400 less lbs.
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Old 06-20-2018, 10:37 PM
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If you get traction it doesn't matter how much it weighs. Just power and torque.
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Old 06-20-2018, 10:38 PM
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Originally Posted by exninja View Post
If you get traction it doesn't matter how much it weighs. Just power and torque.
Come on stress on the shafts depends on the weight being moved
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Old 06-21-2018, 07:12 AM
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That's what I was thinking^
A goblin weighs almost 1/2 what a cobalt does and shouldn't stress the drivetrain as hard due to moving less mass. But I'm not an engineer.
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Old 06-21-2018, 01:39 PM
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If I'm going to analyze the stresses in a transmission, my inputs to my analysis are torque and power going into it. Weight of the vehicle may affect how much power and torque are input to the transmission, but it doesn't directly affect the input to the transmission. That's why I mentioned traction. If you can get all 300hp and 330ft-lb to the ground, that's what goes through the transmission. It doesn't matter what the vehicle weighs in that sense. If for some reason weight adds to bearing loads then that is possible, but chassis design is intended to prevent your transmission gears and shafts from carrying vehicle weight.
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Old 06-21-2018, 02:00 PM
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Originally Posted by exninja View Post
If I'm going to analyze the stresses in a transmission, my inputs to my analysis are torque and power going into it. Weight of the vehicle may affect how much power and torque are input to the transmission, but it doesn't directly affect the input to the transmission. That's why I mentioned traction. If you can get all 300hp and 330ft-lb to the ground, that's what goes through the transmission. It doesn't matter what the vehicle weighs in that sense. If for some reason weight adds to bearing loads then that is possible, but chassis design is intended to prevent your transmission gears and shafts from carrying vehicle weight.
But the weight of the vehicle affects the force required to move the chassis, the transmission failure is from the gears spreading apart (at least thats what Jason found iirc) which is likely related to the load on the output shaft
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Old 06-21-2018, 02:35 PM
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I don't know what Jason's findings are or what you're referring to. I'm going to assume that "gears spreading apart" is due to separation due to bending of shafts. When you put a load on a gear, there are loads in the normal and tangential directions which bends shafts and causes gears to separate.

The drivetrain puts a torque on the wheels, which puts a force on the pavement via friction in the direction of acceleration. F=ma, so lower the mass, the higher the acceleration. But when i'm looking at the drivetrain, I don't care about the "m" or "a" independently, I only care about the "F" which is a product of torque.

I am currently working on helicopter transmissions. In absolutely nowhere in our stress reports does it mention vehicle weight (trying to think of an equivalent load) as a load for the transmission internals. It is purely torque/power/rotor speed (depending on the part). The vehicle weight certainly affects the torque output/input, but I don't care about the weight itself. For example, a light helicopter in a climb can require the same rotor torque as a heavier helicopter in a hover, but as a drive system stress analyst I only care about the torque or power. I don't really care how heavy or what it's doing. Similarly, a light car accelerating quickly will require the same torque as a heavier car accelerating more slowly.
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Old 06-21-2018, 02:41 PM
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You might be correct, I haven't picked up a book on it in awhile and trying to account for all the forces is an exercise I don't want to do (to hell with those vectors).

The gear separation I'm talking about has to due with the axial load from the helical gears, literally pushing the gearset apart so the load goes from the entire face to an edge or only part of the face.
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Old 06-21-2018, 02:49 PM
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Originally Posted by ECaulk View Post
The gear separation I'm talking about has to due with the axial load from the helical gears, literally pushing the gearset apart so the load goes from the entire face to an edge or only part of the face.
Helical gears will have forces in normal, tangential, and axial directions purely due to torque so that makes sense. If there is an additional axial load due the weight of the car (maybe due to deflection of the chassis), then that's an extenuating circumstance that would be due to chassis design rather than just the weight. That would also be particular to the chassis in question and cannot travel between designs.
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Old 06-21-2018, 02:52 PM
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Originally Posted by exninja View Post
Helical gears will have forces in normal, tangential, and axial directions purely due to torque so that makes sense. If there is an additional axial load due the weight of the car (maybe due to deflection of the chassis), then that's an extenuating circumstance that would be due to chassis design rather than just the weight. That would also be particular to the chassis in question and cannot travel between designs.
Yup, and we know the cobalt chassis was designed around an automatic transmission not for either manual F23 or F35. The Goblin who knows
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Old 06-21-2018, 02:59 PM
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Originally Posted by ECaulk View Post
Yup, and we know the cobalt chassis was designed around an automatic transmission not for either manual F23 or F35. The Goblin who knows
lol, could be even worse and even more necessary to go F40. Lack of proper analysis is the most frightening part of this or my kit car.
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