1engineer
Moderator
OK, I'm back. In the last few weeks I have put 1100 miles on the 4Runner with about 100 of those off road. Mostly dirt road but several miles of rougher stuff. I felt like I was in the Planes, Trains and Automobile movie because I drove, flew on a plane and helicopter and then a barge. I seldom have weeks like this anymore thank goodness. When I was in my 20's and 30's this type of travel was exciting. Not so much anymore. It is good for stories though! Hey Harper, I waved when I went over your place, did you see me? Lol nevermind it was about 2 am though.
I answered the few pm's I had and I see there are a few questions asked while I was gone.
Question: "also added a 1000W inverter back there. Do you guys have any idea how many LED's I can run with this sucker!? (1engineer can let me know from one of his electrical buddies... )" From the Antman build thread.
@Antman: Most common LED's (the size you love) use 20mA at 2V or so, so about 40mW (0.04W). With your inverter you should be able to power about 25,000 of them. Now, to determine if you have enough amps out of your battery to drive 25,000 LED's you have to apply Kirchoff's Voltage Law (to calculate voltage across resistance) and then use Ohm's Law. When you work that out the answer will be, assuming your battery will put out about 450 amps, gives you the current to drive only 22,500 LED's! Also remember that colored LED's require a little more current than a white LED. Hope this helps lol. I did not have to "consult" my EE friends for this. I had a few classes in circuits design once upon a time. Let me know when you mount all these LED's and I will bring my welding hood so I can look at them haha! Hey in all seriousness your 4Runner looks great and your custom interior storage and lighting is first rate. Job well done!
Question: "1Engineer: How come the bumper is still in place yet everything above it is wrapped back? With a low slung BWM (assuming it was not an X series) you would expect the bumper beam to take more of the hit?" This is from the H2O_doc thread on his wreck called "Really? 6K miles really?".
@Okki: The only picture I saw is the first picture in his thread. It would appear that the BMW struck the 4Runner on the left front corner. When I look at things like this and try to analyze what happened I personally have to think of the action in slow motion - almost like looking at film one frame at a time. With that said it appears that the BMW's initial impact was on the left front corner, right in front of the front wheel. When it hit, the front bumper and fender received an incredible lateral force. The bumper reinforcement is bolted to the 4Runner's frame so both frame rails added rigidity to the impact. Now, as the BMW's transmitted force continued into the 4Runner it met with increasing resistance of the front bumper reinforcement tied to the frame. When that happened, the BMW front end rode "up" as this was the easier path of resistance and through the radiator support, grille, hood and fenders. At about this time (remember thinking in slow motion) H2O_doc's vehicle started to spin due to the violent impact, which would have lessened the impact by dissipating some of the energy through the friction of the tires on the ground. If you go back and look at the picture again you will see it appears that the front bumper reinforcement, while unbent, is pushed over several inches towards the right. As it is still bolted to the frame this means the front part of the frame is bent in that direction too. Also the front clip (a clip is the complete front end sheet metal from the front doors forward) is shoved in that direction too. While there are no pictures of it If we could see the right side the back of the right fender is probably keeping the right front door from opening. So, the reason the bumper reinforcement is not bent is it received a lateral instead of a longitudal force. This help?
Now, as I only saw one picture I could be totally wrong lol! H2O_doc can you clarify?
Glad to be back and hope all of you guys have a great Easter.
I answered the few pm's I had and I see there are a few questions asked while I was gone.
Question: "also added a 1000W inverter back there. Do you guys have any idea how many LED's I can run with this sucker!? (1engineer can let me know from one of his electrical buddies... )" From the Antman build thread.
@Antman: Most common LED's (the size you love) use 20mA at 2V or so, so about 40mW (0.04W). With your inverter you should be able to power about 25,000 of them. Now, to determine if you have enough amps out of your battery to drive 25,000 LED's you have to apply Kirchoff's Voltage Law (to calculate voltage across resistance) and then use Ohm's Law. When you work that out the answer will be, assuming your battery will put out about 450 amps, gives you the current to drive only 22,500 LED's! Also remember that colored LED's require a little more current than a white LED. Hope this helps lol. I did not have to "consult" my EE friends for this. I had a few classes in circuits design once upon a time. Let me know when you mount all these LED's and I will bring my welding hood so I can look at them haha! Hey in all seriousness your 4Runner looks great and your custom interior storage and lighting is first rate. Job well done!
Question: "1Engineer: How come the bumper is still in place yet everything above it is wrapped back? With a low slung BWM (assuming it was not an X series) you would expect the bumper beam to take more of the hit?" This is from the H2O_doc thread on his wreck called "Really? 6K miles really?".
@Okki: The only picture I saw is the first picture in his thread. It would appear that the BMW struck the 4Runner on the left front corner. When I look at things like this and try to analyze what happened I personally have to think of the action in slow motion - almost like looking at film one frame at a time. With that said it appears that the BMW's initial impact was on the left front corner, right in front of the front wheel. When it hit, the front bumper and fender received an incredible lateral force. The bumper reinforcement is bolted to the 4Runner's frame so both frame rails added rigidity to the impact. Now, as the BMW's transmitted force continued into the 4Runner it met with increasing resistance of the front bumper reinforcement tied to the frame. When that happened, the BMW front end rode "up" as this was the easier path of resistance and through the radiator support, grille, hood and fenders. At about this time (remember thinking in slow motion) H2O_doc's vehicle started to spin due to the violent impact, which would have lessened the impact by dissipating some of the energy through the friction of the tires on the ground. If you go back and look at the picture again you will see it appears that the front bumper reinforcement, while unbent, is pushed over several inches towards the right. As it is still bolted to the frame this means the front part of the frame is bent in that direction too. Also the front clip (a clip is the complete front end sheet metal from the front doors forward) is shoved in that direction too. While there are no pictures of it If we could see the right side the back of the right fender is probably keeping the right front door from opening. So, the reason the bumper reinforcement is not bent is it received a lateral instead of a longitudal force. This help?
Now, as I only saw one picture I could be totally wrong lol! H2O_doc can you clarify?
Glad to be back and hope all of you guys have a great Easter.
Last edited:
![flash[1].jpg](https://www.toyota-4runner.org/data/attachments/48/48189-1262de5b9265419f28cf2f908d4ea3b5.jpg?hash=-Nc5Rp-ouz "flash[1].jpg")
![flash[1].jpg](/data/attachments/48/48189-1262de5b9265419f28cf2f908d4ea3b5.jpg?hash=-Nc5Rp-ouz)
