HPI SF-50WP Specs are Bunk Right????

[alexchen86]

So I have a Apache C1 flux and I want to swap to a stronger and faster servo....I figure the stock HPI SF-50WP servo that came with the buggy would be metal geared at best maybe pushing around 160 oz/in on 6V.

Then I looked at Tower and it claims 266.6 oz/in @ 6V!!! Speed is just as fast as a digital Hitec 5645MG but it lists more torque!!

Are these specs accurate? I have a 5645MG or a 7940TH I could replace it with in my parts bin but if the stock is already above 200 oz/in putting in a 5645MG would be a step backwards right?

[binaryterror]

Just because it is rated at 6v, does not mean the stock ESC is sending out 6volts via the BEC, which would slow speed and lower torque ratings.

[alexchen86]

Right. So should I just keep that stocker servo in there and run a cc bec like I always do on my trail/comp rigs? And if I were to just swap the HPI servo to a 5645MG without adding a BEC would I notice anything? Like power degradation...slower speeds because it's digital versus analog?

Or should I go ahead and just put a high voltage servo I have like the 7940TH w/cc bec @7.4V?

[binaryterror]

Simple thing to do is to add a BEC and find out what happens to the stock servo.

[alexchen86]

Yup gonna go tinker later on tonight after work....the stock servo feels really weak. But if it's waterproof I think using it in a mud rig would be fun....an extra RTR servo pushing over 200 oz/in with a bec should equal great times!

[TexasSP]

Alex, the ESC in the C1 flux is essentially a MMPro which means you should be able to change the BEC voltage via the CC link.

[alexchen86]

I did I upped it to 6.0V already...feels a bit too sluggish to me on asphalt when Im pulling out of a tight parking lot corner lol. What's cool is the tire compound HPI put in actually squeals pretty loud on hard turns lol....too much fun. I've never had a RTR that was this much fun out of the box....no complaints at all. I liked it better than my Exo which I got rid of it last week.

[indiana mudcat]

Voltage adjustability on the MMP is a moot point since its still only like 1 Amp.

[alexchen86]

Oh I learned something new today! I always wondered if changing the servo voltage on an MMP really pushed out that much extra power. I hardly notice it compared to an external bec. I just take everyone's advice around here to run BEC's on all Castle ESC's.

I even run CC BEC's on 3 of my BRXL's just to be safe.