Hpi nitro 3.0 with a mind of its own….help please

[37tattooskernow]

Hi everyone, hope somebody can help. Received this st as a gift over Xmas. I’ve bind the transmitter and servo, run the nitro engine in. All was good until I did my first full acceleration then braked. The thing then accelerates by own, then brakes then accelerated before coming to blows with the local tree. The steering didn’t work either. I’ve since tested it without the engine running and the same thing happened, you hold accelerate then depress brake …then the servo starts braking and accelerating all by itself. I’ve zero’s the trim and plus and minuses it ….nothing helps. It’s got a fail safe as standard which didn’t work ……what am I doing wrong, or rather what is wrong with the chariot ?…any advice will be much appreciated. Thank you

 

[Lostinthewoods86]

Just my experience with a brand new HPI Vorza nitro…the stock servos leave a lot to be desired. They both went out within the first couple runs.

One other thing is what battery(s) you using for Rx/servos? Tmaxx gets squirrelly like that when battery gets low

 

[37tattooskernow]

Hey lost in the woods, cheers for reply. I'm using voltz 1.5 alkaline batteries, fully charged as recommended by model sports who supplied it. Cheersv

 

[Lostinthewoods86]

I would certainly wait for more experienced folks here, but I would toss the plastic geared servos in it and get a better battery set up then AA’s

And welcome by the way !

 

[Littlemotor]

What is the BRAND of your cells? The reason I ask is that MOST (to my knowledge) alkaline cells are not rechargeable, but are the required 1.5V needed to operate a 6V system. When folks run a typical NiMH to have the benefits of recharge-ability, they are now below the 6V needed to properly power their system-as these cells are only 1.2V (in a AA), and obviously only bring a total of 4.8V to a 6V party.. This could obviously cause the issue you’re experiencing (SOMETIMES even with a failsafe properly set up)..

Ages ago (before LiPo/Li-Ion/LiFE), we used to modify our transmitters to accept an extra NiMH cell so that we could have the required 6V, and still be rechargeable.

In your case-IF this is what’s going on, you could easily move to a Rx specific NiMH mini-5 cell pack that will have 6V, while still being rechargeable. -or you could step up to a LiPo/LiFE/Li-Ion/LiHV pack; provided your electronics are capable of supporting it.

 

[37tattooskernow]

I would certainly wait for more experienced folks here, but I would toss the plastic geared servos in it and get a better battery set up then AA’s

And welcome by the way !

Thanks, ps is that a greyhound on your pick ?

 

[37tattooskernow]

What is the BRAND of your cells? The reason I ask is that MOST (to my knowledge) alkaline cells are not rechargeable, but are the required 1.5V needed to operate a 6V system. When folks run a typical NiMH to have the benefits of recharge-ability, they are now below the 6V needed to properly power their system-as these cells are only 1.2V (in a AA), and obviously only bring a total of 4.8V to a 6V party.. This could obviously cause the issue you’re experiencing (SOMETIMES even with a failsafe properly set up)..

Ages ago (before LiPo/Li-Ion/LiFE), we used to modify our transmitters to accept an extra NiMH cell so that we could have the required 6V, and still be rechargeable.

In your case-IF this is what’s going on, you could easily move to a Rx specific NiMH mini-5 cell pack that will have 6V, while still being rechargeable. -or you could step up to a LiPo/LiFE/Li-Ion/LiHV pack; provided your electronics are capable of supporting it.

Cheers for that, will swap the batteries out…..been a while like 20 yrs since been involved with rc so will do a test with new batteries in the morning. If it works will upgrade to a mini 5 cell as you advised and a big cheers from me

 

[Littlemotor]

Cheers for that, will swap the batteries out…..been a while like 20 yrs since been involved with rc so will do a test with new batteries in the morning. If it works will upgrade to a mini 5 cell as you advised and a big cheers from me

No problem bud! If you’ve got access to a multi-meter, give them a check. I never trust the label-seen too many well below advertised voltage to risk a runaway with an expensive nitro vehicle.

 

[Lostinthewoods86]

Thanks, ps is that a greyhound on your pick ?

No problem. And Littlemotor will get you fixed up

And the pup is a catahoula cur mix

 

[37tattooskernow]

No problem. And Littlemotor will get you fixed up

And the pup is a catahoula cur mix
View attachment 261524

Stunning hound, just stunning

 

[Lostinthewoods86]

Stunning hound, just stunning

Thank you!

 

[37tattooskernow]

My tiger

 

[Lostinthewoods86]

Beautiful pup!

 

[37tattooskernow]

No problem bud! If you’ve got access to a multi-meter, give them a check. I never trust the label-seen too many well below advertised voltage to risk a runaway with an expensive nitro vehicle.

You were correct…changed batteries, it run like a dream …well until a bolt ejected itself resulting in a floppy front wheel and no sign of said nut or bolt . But thank you, was a fantastic 4 minutes of nitro…..you legend

 

[Littlemotor]

You were correct…changed batteries, it run like a dream …well until a bolt ejected itself resulting in a floppy front wheel and no sign of said nut or bolt . But thank you, was a fantastic 4 minutes of nitro…..you legend

Think nothing of it bud! Like @Lostinthewoods86 mentioned; -an RC specific NiMH Rx pack will make life much easier. Glad you had several minutes of fun! You’ll be back out there soon!