Ofna Ultra GTP Conversion!
 

So, my next project begins.
I just got home from the LHS, ordered the Ultra GTP kit as well as the Porsche 911 body for it! :yipi:
I can't pick them up until next monday or tuesday though because I'm taking a trip with my dad. :smile: :grrrrrr:
I'm going to run my Hacker C-50Maxx, MM, and 5s with a TrueRC BEC. Also going to run a HS-645MG (oddly I have them in all of my projects)
Gearing will be about 14/45 (58mph)
Calculated:

Differential Ratio: 3.142857142857143
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 45
Pinion Tooth Count: 14
Total Voltage: 18.5
Motor KV: 3033
Tire Diameter (inches): 3.8
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 3.21 : 1
Total Ratio: 10.10204 : 1
Tire Circumference (inches): 11.94 inches (303.23 mm)
Total Motor Speed: 56110.5 RPM
Vehicle Speed: 62.79 mph (100.87 km/h)
Estimated Adjusted Speed: 57 mph (92 km/h) - 9% loss
Effective KV Value: 3033
KT constant: 0.45 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

Does it have the spool or the diff? I'm running the spool and trying to find something smaller that 51!

It's got the spool. Does that mean I have a 51t spur? Do I have to change anything about my plan?

Arkt1k: SDP-SI is where I got mine. Sort them for M1, Acetal w/Brass insert, Hub w/SS, 8mm bore size.

BL_RV0: Are you gonna run foams? The stock tires will balloon a little bit. I noticed it was set to 0 in the calc. The GTP kits are very nice. BrianG, B4Maz, and myself are also working on conversions. Good luck with yours!

I have one to and will post up - yes it is 51...

I ran at the w/e with a Hacker B50 7XL 4s geared 22/51 and it was recorded consistently at 48mph/50mph on the radar...

How well does that spur hold up?

I would not run the c50 maxx over 4s if I were you...

Mine ran nicely in a hyper7 on 4s. Had it geared 11/46 and it ran cool, and did around 40mph.

Not going to run foams. Forgot about the ballooning, but I figure it won't make much of a difference.

I should be asking you, did you have any problems?



Sadly, I don't have the funds for a 4s pack, and couldn't bear to sell the Hacker, so that's why I chose an onroad. Takedown ran the Hacker in a Matrix truggy on 5s and he said it did fine- in a TRUGGY!
I'm sure it'll do alright in the onroad.

Ordered from Mike:
Ultra GTP Mount
Bore reducer
16t pinion

Got the GTP, and the stuff came from Mike! :yipi:
Got all the nitro stuff removed, installed the RCM mount and pinion, along with the C50-Maxx.
Pics:
http://i160.photobucket.com/albums/t...X/IM006261.jpg

http://i160.photobucket.com/albums/t...X/IM006262.jpg

sweet!

Make sure you shim you fr and rr diffs. My rear ring and pinion is getting a little clicky.

Very true, Hongnor k series diffs (most ofna vehicles save for the hyper line) are not the best, and require a good shim job...

By the way I run 8xl on 5s 22 tooth pin on foams and it is retarded. I usually set EPA to 85% (140% is max) still hard to control.Have fun

Looks like a fun project RV0. I never had any issues with the hacker when I ran it on 5s.

Also will this be made into a rally kit. Onroad's arent to exciting IMO because all you can do is street driving. Atleast when your rally converted you can go offroad somewhat.