Ofna Ultra GTP Conversion!

[BL_RV0]

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!
I can't pick them up until next monday or tuesday though because I'm taking a trip with my dad.
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...

[Arct1k]

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

[BL_RV0]

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

[What's_nitro?]

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!

[Arct1k]

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?

[lincpimp]

Originally Posted by BL_RV0

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

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.

[BL_RV0]

Originally Posted by What's_nitro?

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!

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

Originally Posted by Arct1k

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 should be asking you, did you have any problems?

Originally Posted by lincpimp

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.

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.

[BL_RV0]

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

[BL_RV0]

Got the GTP, and the stuff came from Mike!
Got all the nitro stuff removed, installed the RCM mount and pinion, along with the C50-Maxx.
Pics:

[brushlessboy16]

sweet!

[gimpygolden]

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

[lincpimp]

Originally Posted by gimpygolden

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...

[gimpygolden]

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

[Takedown]

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

[Takedown]

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.