R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 07-30-2014, 06:47 AM   #2056
Tech Master
 
Join Date: Mar 2011
Location: Austin,TX
Posts: 1,031
Trader Rating: 23 (96%+)
Default

Quote:
Originally Posted by SouthFloridaApp View Post
I believe you can use two 2s batteries in the ofna battery tray.
I think the point someone was trying to make earlier is that there is an inherit problem with running packs in series. It's impossible to get matched cells, therefore one pack will always have a tendency to dump quicker than the other. When I first got into 1/8 Racing I used to use a series adapter to run 2x2S in series, and yes it "worked" for short qualifiers, but I started experiencing intermittent problems during long 8-10 min mains. It was frustrating, because I would hit LVC only to discover after recharge that one pack was nearly 50% full while the other was completely drained

I experimented with swapping relatively new packs out and still got the same problematic results. Once I bought a dedicated 4S pack (with matched cells), then all my LVC problems went away

I'll never run packs in series ever again
billdelong is offline   Reply With Quote
Old 07-30-2014, 07:48 AM   #2057
Tech Champion
 
liljohn1064's Avatar
 
Join Date: Sep 2008
Location: Deerfield, WI
Posts: 5,280
Trader Rating: 16 (100%+)
Send a message via AIM to liljohn1064 Send a message via MSN to liljohn1064 Send a message via Yahoo to liljohn1064
Default

Quote:
Originally Posted by whitrzac View Post
The GTP = ofna ultra/lx buggy. IRRC it was released in the late 90s or early 2000s. They still make them

Some of the GTP specific parts might become hard to find someday.


The kyosho gt = MP7.5(or 777 idk which), It was released shortly after the ofna
The OFNA parts also interchange with the Mugen MBX for the most part.
__________________
John Higgins
liljohn1064 is offline   Reply With Quote
Old 07-30-2014, 08:18 AM   #2058
Tech Champion
 
liljohn1064's Avatar
 
Join Date: Sep 2008
Location: Deerfield, WI
Posts: 5,280
Trader Rating: 16 (100%+)
Send a message via AIM to liljohn1064 Send a message via MSN to liljohn1064 Send a message via Yahoo to liljohn1064
Default

Quote:
Originally Posted by SouthFloridaApp View Post
The dual battery setup for the serpent has one major downfall......there is no room and maintenance is a pain in the arse........ I have my gtp2e on the way. I think the quality will be ok...not serpent quality..... But parts are really cheap.....I don't think I will have to worry about parts in the future.....at least one or two years...guessing here.... When a diff goes bad in my gtp2e I will probably just replace the entire diff.....
This car is inexpensive, but not cheap junk. I have mine set up for racing. I would get the SMC or Hobbyking 4S packs. As mentioned before, you don't want the headache of 2 X 2S. The first thing I did was put E5 connectors on the ESC and Batteries to handle the current. The only Hopups I have added are the rear pivot ball kit to gain more rear toe in and the RC Monster single speed conversion to put on a smaller spur to run larger pinions. The Pivot Ball kit is not needed if you're racing: I'm trying to go around really tight corners as fast as I can. The single speed conversion is needed if you want to race in a 4S class to get into the 50 to 60 MPH range. Optimal motor is 1900 to 2650 for racing. I picked up the Hobbywing 150A ESC and 4068 2250kv motor and could not be happier. I recommend front yellow springs with 80 or 90 shock oil and rear red springs with 50 or 60 oil. The front diff is great out of the box with the right diff lube, I think it might be the 50K range. The rear diff could be a little stiffer, somewhere in the 5 to 10K range. I've been running Sweep EXP 45s premounted on the ROK V2s with new inserts and they hold up really well.
__________________
John Higgins
liljohn1064 is offline   Reply With Quote
Old 07-30-2014, 08:32 AM   #2059
Tech Master
 
Join Date: Mar 2011
Location: Austin,TX
Posts: 1,031
Trader Rating: 23 (96%+)
Default

Sweep EXP50's are the tire of choice in my area, however the ROK wheels have proven to be kinda weak when hitting the boards, they will crumble up.

I prefer to mount my tires on OFNA wheels and I buy them unmounted here:
http://www.sweepracingusa.com/18-GT8_c_25.html
billdelong is offline   Reply With Quote
Old 10-18-2014, 12:08 PM   #2060
Tech Master
 
Bmr4life's Avatar
 
Join Date: Mar 2009
Location: 30084
Posts: 1,444
Trader Rating: 50 (100%+)
Default

Just wanted to give an update on my high speed Late Model. Did some test runs today only running 4s. Gearing is 29t pinion with 36t spur. Motor is a CC 1800kv 1y and esc is a XL2. Tires are GRP.

Speed calc says I'm gearing for 87mph with max voltage lipo, 77mph for 3.7v per cell.

GPS confirmed that I hit 79.1mph in about 600ft which includes a soft start and breaking room. It is a slight down hill, but I think that just makes up for my short running distance.

Did the run several times in both directions. Motor hit 170F with no fan, esc was around 120F and battery was around 100F.

6S should get me close to 120mph and terrified of thinking of 8S which the motor and esc are capable of running.













__________________
Too many RC's to list.
Bmr4life is offline   Reply With Quote
Old 11-29-2014, 09:25 PM   #2061
Tech Addict
 
Join Date: Jan 2008
Location: Miami Beach
Posts: 607
Trader Rating: 6 (100%+)
Default

I finally got my snr gtp2e going. I went to a world class large rc track (homestead rc speedway--you tube it). They usually run a somewhat short track...about 60 percent of the entire track. To my dismay they were using te long track. I was not eared correctly. I am running te following:

Stock gtp2e with the snr graphite chassis and dm1 front bumper and rear diffuser. Diffs and shock oils were stock.

Turnigy track star motor with a hobbywing fan that is screwed into the diff top plate and is over the motor. Two 2s battery packs...most of the time my 6500 smc's. A hobbywing 150 amp esc. I originally had a 17 tooth pinion in but need more top speed so I put in a 18 tooth pinion. I needed a 20 approx. as the straight is so long and I topped out about 40 percent down it... I was running 25 second laps at first with zero changes to the car. With the new pinion my lap times went down about a half sec on avg. I then started setting ride height and got in the 23.5-24.5 range. My last change was to install firm yellow springs. My corner speed was much better on the sweeper, but my lap times were a little slower. I do not have rear springs yet.... I felt the car had more potential with the more firm yellow fronts. I had to Go after that. I will order some springs for the rear... And will change out the shock oil and Diff oil as well. So much fun...youtube the track.....amazing... Fyi I was worried about heat, but it was never a problem.... I will also gear up as well. Lastly, I will add more anti squat in the future... So much fun....
SouthFloridaApp is offline   Reply With Quote
Old 12-23-2014, 12:47 AM   #2062
Tech Adept
 
Join Date: Aug 2009
Posts: 170
Default

Quote:
Originally Posted by Bmr4life View Post
Just wanted to give an update on my high speed Late Model. Did some test runs today only running 4s. Gearing is 29t pinion with 36t spur. Motor is a CC 1800kv 1y and esc is a XL2. Tires are GRP.

Speed calc says I'm gearing for 87mph with max voltage lipo, 77mph for 3.7v per cell.

GPS confirmed that I hit 79.1mph in about 600ft which includes a soft start and breaking room. It is a slight down hill, but I think that just makes up for my short running distance.

Did the run several times in both directions. Motor hit 170F with no fan, esc was around 120F and battery was around 100F.

6S should get me close to 120mph and terrified of thinking of 8S which the motor and esc are capable of running.
Try 0 degree toe end rear. Your tires are scrubbing off speed with the wheels pointing inwards. I would run yellow springs all around.
Twisted_Metal is offline   Reply With Quote
Old 12-23-2014, 07:03 AM   #2063
Tech Master
 
Bmr4life's Avatar
 
Join Date: Mar 2009
Location: 30084
Posts: 1,444
Trader Rating: 50 (100%+)
Default

Quote:
Originally Posted by Twisted_Metal View Post
Try 0 degree toe end rear. Your tires are scrubbing off speed with the wheels pointing inwards. I would run yellow springs all around.
I thought it helped with stability?
__________________
Too many RC's to list.
Bmr4life is offline   Reply With Quote
Old 12-25-2014, 08:14 PM   #2064
Tech Adept
 
Join Date: Oct 2014
Posts: 110
Default

HI!Potoczak,Did you have OFNA 1:8 X3E RTR?
Quote:
Originally Posted by Potoczak View Post
Is anybody else running this car? How do you like it??? And what kind of electric setup you guys running???
magenepaile is offline   Reply With Quote
Old 12-28-2014, 04:59 PM   #2065
Tech Regular
 
MikeGozz's Avatar
 
Join Date: Aug 2011
Posts: 324
Trader Rating: 17 (100%+)
Default

Does anyone have issues with the diff oil leaking out of the diffs? I noticed there is now gasket or anything in the manual. Is is a problem?
MikeGozz is offline   Reply With Quote
Old 12-28-2014, 10:51 PM   #2066
Tech Master
 
Join Date: Mar 2011
Location: Austin,TX
Posts: 1,031
Trader Rating: 23 (96%+)
Default

all you need to do is apply fresh grease around the gasket and rubber o ring, if the rubber o ring is torn, you'll want to replace it.
billdelong is offline   Reply With Quote
Old 12-31-2014, 02:39 AM   #2067
Tech Addict
 
Join Date: Sep 2014
Location: Bay Area, Cali
Posts: 530
Default Largest pinion with stock 51t spur?

I know this question has been asked before but what is the largest pinion that can be used with the stock 51t spur? Never found a definite answer. I'v heard 25T, 26T, 29T......etc. Thanks in advance!
tc4basher is offline   Reply With Quote
Old 12-31-2014, 04:33 PM   #2068
Tech Elite
 
Jspeed's Avatar
 
Join Date: Oct 2006
Location: America!
Posts: 3,511
Default

Quote:
Originally Posted by Bmr4life View Post
I thought it helped with stability?
Ultra high speed stability is based more on the aerodynamics of the body than anything else.

141 MPH Speed Run Ofna GTP-2
https://www.youtube.com/watch?v=kF0eyPkE0b8

Jspeed is offline   Reply With Quote
Old 12-31-2014, 07:07 PM   #2069
Tech Apprentice
R/C Tech Elite Subscriber
 
Join Date: Apr 2014
Posts: 94
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by Jspeed View Post
Ultra high speed stability is based more on the aerodynamics of the body than anything else.

141 MPH Speed Run Ofna GTP-2
https://www.youtube.com/watch?v=kF0eyPkE0b8

What body is this? I can't seem to find it anywhere (which one it is), even tho I've seen many people who have it.
source_21 is offline   Reply With Quote
Old 01-02-2015, 04:15 AM   #2070
Tech Elite
 
Jspeed's Avatar
 
Join Date: Oct 2006
Location: America!
Posts: 3,511
Thumbs up

Quote:
Originally Posted by source_21 View Post
What body is this? I can't seem to find it anywhere (which one it is), even tho I've seen many people who have it.
That is the Ipanema Warrior GT race body, just do a google or ebay search, you'll find it.
Jspeed is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 05:16 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net

SEO by vBSEO 3.5.0