|
Losi 8ight speed project
Well I finally have some time to start on a project now that the semester is over. Just got home and began to work on my tekno losi 8ight conversion that i purchased from Desert RC here on the forums. Got a couple more parts on the way and some wires to solder but shes almost ready to go. Anyways here's some pics:
It looked like Christmas morning under the staircase when I showed up to my house :lol: http://img.photobucket.com/albums/v3...IMG_0023-1.jpg China Li-po Goodness http://img.photobucket.com/albums/v3...IMG_0024-1.jpg GRP tires straight from Italy (Shipped in 3 days! WTF?) http://img.photobucket.com/albums/v3...2/IMG_0025.jpg The buggy itself http://img.photobucket.com/albums/v3...IMG_0032-1.jpg http://img.photobucket.com/albums/v3...IMG_0028-1.jpg http://img.photobucket.com/albums/v3...IMG_0029-1.jpg http://img.photobucket.com/albums/v3...IMG_0033-1.jpg http://img.photobucket.com/albums/v3...2/IMG_0035.jpg My buddy just gave me a call with my exact electronics setup but on a losi 8ight-e 2.0 hitting 96mph on 25/43 gearing not punched all the way and scared to death. This is going to be a fun competition to say the least. :intello: |
Sorry for the double post, but theres a 10 photo cap.
http://img.photobucket.com/albums/v3...IMG_0040-1.jpg http://img.photobucket.com/albums/v3...IMG_0043-1.jpg http://img.photobucket.com/albums/v3...2/IMG_0042.jpg Don't think I'll be able to use the body, but its pretty sweet http://img.photobucket.com/albums/v3...IMG_0051-1.jpg The pro roller donor car (will probably convert this one later on) http://img.photobucket.com/albums/v3...2/IMG_0049.jpg Mamba Monster twins http://img.photobucket.com/albums/v3...IMG_0048-1.jpg The three main speed run cars: http://img.photobucket.com/albums/v3...IMG_0047-1.jpg |
Those wheels are goodness for sure!!
|
i did 100mph last summer with this 8ight. i had video of it up for a long time.
http://i247.photobucket.com/albums/g...t/HPIM6424.jpg http://i247.photobucket.com/albums/g...t/HPIM6420.jpg here's what i did: 1. locked the center diff with playdough (very important) 2. geared it 43/25 3. mamba 2650 motor on 40C 6S lipos 4. Losi rally tires (now GRP tires...aren't they freakin amazing?) 5. adjusted the throttle curve to a more aggressive acceleration. 6. RCM motor mount i just got a pistix to run the phoenix HV 110. i wanna try 8S, but i'm having a hard time trying to design a place to put the servo for the manual brakes. i dig your buggy. very nice indeed. can you get a 25t long bore pinion for the tekno setup? can you post a link please? if so i might build another, so i can install a brake servo. it looks like yours will accomodate it easily. that is one sick chassis design. also, those rally tires take forever to wear out. i probably have close to 80 packs through mine and their still sticky. i bought some back-up sets as well, but i'm not sure i'll ever need them. LOL anyway, very cool design man. :yes: |
My buddy hit 100mph with your exact gearing/setup except hes running the same lipos as me.
I hit 93mph tonight on the car's first run, VERY impressed thus far. As far as the pinions go the largest that will fit with my conversion I'm using a 25tooth on the 1st gear of the rc-monster 2speed conversion, I will try to fit a 29tooth on the 2nd speed but i need the "long shank motor plate" from tekno first. I will break 100 within the coming days and I will get video of both me and my buddies ASAP. Had an unfortunate blow over at near top speed and i was not running a wing at the time, resulting in the most painful lid skid I'd ever had to endure. The result? nothing more than a scratched front shock tower and shaven down wing mount. Here's some pics of my finished buggy: http://img.photobucket.com/albums/v3...IMG_0054-1.jpg http://img.photobucket.com/albums/v3...IMG_0055-1.jpg Oops... http://img.photobucket.com/albums/v3...IMG_0056-1.jpg http://img.photobucket.com/albums/v3...2/IMG_0062.jpg http://img.photobucket.com/albums/v3...IMG_0063-1.jpg http://img.photobucket.com/albums/v3...IMG_0064-1.jpg |
Interesting, I can only imagine the stress on the motor shaft due to that pinion setup... You need to move the motor closer to the center diff bulk...
Glad you had some success, speed is fun! What spec battery are you using? |
The different motor plates to move the motor forward are in the mail, rest assured it will not stay as it in the photos for long. The lipos are shown in the original post, but I'm using Zippy 4000mah 6s 30c lipos. They work great so far, maxing the temp on them at 104 degrees on my completely enclosed body.
|
i think i might have to build one of those. that project is outstanding. nice job.
|
Link where did you get the GRP tires from? I would like to pick up a set or 2...
I should have kept my Tekno converted 8ight... |
http://www.grpgandini.it/index.php?p...ng=en&vmcchk=1
The description says soft but trust me, the compound is like that of a 1:1 car LOL. Shipping seems expensive but it only takes about 3-5 days from Italy. I'm so impressed with the losi speed project that I've decided to convert my race roller over to brushless as well. I just need a rear shock tower, steering servo, and battery tray to be done. Here's some progress pics: http://img.photobucket.com/albums/v3...2/IMG_0068.jpg http://img.photobucket.com/albums/v3...2/IMG_0071.jpg http://img.photobucket.com/albums/v3...2/IMG_0072.jpg And with big brother :intello: http://img.photobucket.com/albums/v3...IMG_0073-1.jpg |
on the pro roller, it looks like you have the diff turned around. you could use a normal sized pinion if you turned it around. i took some pics for you:
http://i247.photobucket.com/albums/g...ofHPIM6431.jpg http://i247.photobucket.com/albums/g...ofHPIM6430.jpg http://i247.photobucket.com/albums/g...t/HPIM6429.jpg if you use a steel spur it'll work great, you just can't gear it over a 45T. so is that a big bore pinion in the pro roller too? i think i'm gonna try the same build you did for running 8S with the HV-110. that 2 speed gear looks like a great idea. also, is there a way to get the motor closer to the spur gear? i was over at impakt rc, and i couldn't find any variations for a motor mount. would it just mean re-drilling the holes in the chassis? |
What do you mean by "big bore pinion"? Do you have aim/msn? It would be much easier to discuss all this over instant message.
As far as the diff, i knew something seemed wrong! no wonder they raise the diff 3mm. I would need to buy another spur gear though, as the one currently on there is a 46tooth, and you say a 45 is the max before it starts to hit? |
Quote:
Someone who had a 46t said his fits, so i'm not 100% on that one. i just read somewhere that 45 was supposed to be the limit, but maybe they were wrong. you might have to try it out to be sure. as far as a battery box, impaktrc sells the losi battery box which imo the best one to have because it's huge and will accomodate any pack you might wanna use. |
Yeah that's the tray I'm going with. Getting the rest of the parts locally.
For the tekno conversion the best option is the rc-monster 2 speed adapter and then just order one of these: http://www.impaktrc.com/product_info...oducts_id=3161 It moves the motor forward a bit compared to the elektri-clutch mounts: http://www.impaktrc.com/product_info...oducts_id=3160 |
Quote:
|
Don't know to be honest, they came with the tekno losi 8ight, and they looked nicer than my lexan ones that were on the pro roller. I'll get back to you on it once I run the buggy on the track.
|
The new motor plates came in today.. What a waste of time and money. They move the motor forward all of 2mm, and they mount with this countersunk screws that get wedged b/t the motor plates and the main chassis. Now i need to grind away at the chassis or adjusting mesh becomes the biggest hassle of life. No way to run regular pinions or ont he 2nd gear part of the rc-monster gear adapter with the tekno setup, So I may transfer the 2650 over to the race roller to try out the 29/44 gearing. This should yield 112mph.
|
You have to raise the centerdiff a little even for a 43 tooth spur. I just dremelled the chassis of mine in order to get the 46t to fit w/o raising the diff.
|
Hit 98mph on the first pass, 97mph on video:
http://www.youtube.com/watch?v=CsiNpr4n9J0 My temps are well within a safe range (160 on the motor, <135 on esc, 98 on lipo) Ordered a 43tooth spur so I'll try 29/43 to try and hit 110+ |
Cool vid. Not too sure about what amp draw makes a difference but I was just wondering why you settled with the 4000mah when they have 5000mah 40c 6s available from HobbyCity. 200 amps constant vs. 120 IDK. Might as well give it her all.
|
That's crazy man,but very cool.
|
Quote:
Higher C rating= less voltage drop= more speeeeeeeeeeed :party: |
Quote:
for whatever it's worth, it really helped me to adjust the throttle curve to a more agressive acceleration. also, i meant to ask you, where did you get a steel 29T pinion? |
The 2pseed adapter with 2nd speed 29tooth gear from the RC-Monster store.
|
http://www.youtube.com/watch?v=HZ0L3bZ3kaw
100mph, same gearing as before only changed the body to a proline slipstream 2.0 . Sorry for the crappy quality and cursing. Enjoy :) |
Thats awsome, you make it look so effortless. I have a hell of a time just running straight. How do you speed demons set up the suspension?
Jeff |
Mine is setup like so:
Front: 80wt oil 10k diff oil but am going to try something stiffer Green springs droop at arms level black sway bar just a very slight amount of toe out to eliminate turn-in (makes it less touchy at high speed) Rear: 80wt oil light diff oil (1-3k is fine) Purple springs droop at a little past arms level silver sway bar standard 3degrees toe in Center diff J-B Welded together. Now for some pics of the new look, dubbed Miami Vice :intello: http://img.photobucket.com/albums/v3...2/IMG_0121.jpg http://img.photobucket.com/albums/v3...2/IMG_0122.jpg http://img.photobucket.com/albums/v3...2/IMG_0118.jpg http://img.photobucket.com/albums/v3...2/IMG_0120.jpg http://img.photobucket.com/albums/v3...2/IMG_0116.jpg |
Quote:
nice job on 100. isn't that buggy amazing? i was too much of a pu$$y to JB weld my diff. i used playdough in case i deceided to go play in the dirt. :lol: is that an ofna high flow wing? they work great. i just finished another 8ight yesterday. i'm kinda shelving the tekno build right now because you said you didn't care for the new mounts. i gotta figure out a way to get a high torque mini servo on the stock chassis if i wanna use manual brakes with the phoenix on 8S. cool looking lid btw. Crocket would be proud. :rofl: |
I'm going to give mechanical brakes a shot this coming week, just don't want to incinerate brake disks.
I have some composite ones that should do the trick though ;) Wing is a stock losi cut down |
Man you guys should plan on attend the 2010 ISC challenge. These buggies would easily kill the current Open Wheel class. The current speed is 81.75mph, set by a current member here and his Emaxx. The buggies will qualify in this class since they run buggy bodies and the wheels are exposed. It sure would be cool to see a couple buggies duking it out for top speed honors...
|
My buddy Bernard from CT Motorsports here in Miami took home a few records at the recent ISC event, I may look into it with both this and my ta05 :mdr: I need to hit AT LEAST 115-120 with the 8ight before even thinking about it though. If the 2650 has enough juice? Well, only one way to find out. As it stands, according to my numbers, I'm having about a 17% efficiency loss due to drivetrain loss and voltage drop. This is much better than expected, not to mention the temps are staying nice and low. So 115 may be attainable with this setup. This is too fun.
|
ran 103mph today, but was geared for 118. I'm going to try and find a happy medium, Probably somewhere around 107-112.
|
congrats...that, i believe is a new record. :surprised:
i'm done with my speed runs till summer. it's barely above freezing and we got 27 inches of snow last week. :cry: |
Dwight- feel free to send them my way. We have plenty of warm temps for speed runs...
DCastaneda- Great job on 103mph. Thats pretty darn fast. I think some aerodynamics could push this car even faster with current setup. |
congrats on the buggy and the 103.keep up the work.
phil |
Dwight- Got to love Florida weather. you can run nitro year round here (as if I would want to, ha!). 103mph i don't think is a record, I think an inferno GT or someother "onroad" buggy hit 118mph at the ISC event this year. It may technically be an onroad car but its in the same class as mine IMO.
NitroStarter- Any particular recommendations as far as aero goes? Phil- Thank you I appreciate it. BTW this is DanielC on RC-ISC :na: As a side note, the 103mph was on my 2nd buggy, with the rc-monster motor mount and Losi tray. I want to say the Tekno conversion is a lighter setup, but frankly i don't know and the opposite is probably true. Going to tear down and lube everything on the car today, then patiently await Mike to ship me out that 26tooth! For record breaking runs i have other ideas up my sleeve. If a deal i made yesterday goes through (selling another speed project) I may be attempting an HV setup :mdr: |
Quote:
Running more than 4s would put you in the Open electric class in which case you would be competing against Nic Case, which I don't see a buggy reaching 160+mph anytime soon... That why I was suggesting running in the Open Wheel class, which would be the only class you qualify in running a buggy body. Record is on 81.75mph. Quote:
|
Hmm, I must havve been misinformed then. In that case I guess I've got myself an unofficial record! *Sets off multiple fireworks*
Going to give the buggy a complete tear-down while I wait for my pinion gear to squeeze the most speed possible out of this bugger. For the a-arms a sleek airfoil shape out of lexan might work.. don't know how much of an effect it would really have though. |
I would recommend this for at least the center diff if you can't make your own:
http://www.amainhobbies.com/product_...ial-Lock-Spool It will remove about an ounce of weight from each diff you put it in and decrease wobble. |
Quote:
A L8ight front shock tower, with matching front shocks would smooth down the aero at the front also Edit: I went back & had a look at pics from post #27...I'd suggest losing the 1/8 rear wing in favour of a wing with a longer cord length. You've obviously done the right thing by removing all the downforce elements but I'd be surprised if you're not getting a huge amount of oscillation with such a narrow chord |
| All times are GMT -4. The time now is 05:20 AM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.