I run mine in the SHR mode & have never experienced any problems. Did enjoy a definite noticeable servo speed increase when I changed from NiMH to a LiFe battery though. That wasn't the reason for changing to a LiFe battery but sure was appreciated - I was just after the increased capacity & also happened to need to replace my old packs anyway.:p And no need for a regulator or anything to modify or alter was definitely a bonus. No worries about damaging the servos though coz the 10% increase in voltage won't hurt anything (I know it's actually more like 15-20% voltage increase as 6.6V is just the nominal rating, fully charged a 2S LiFe is around 7.2V).:nod:

this depends on which receiver your using the 451, you can use in shr mode but if your using the 451R then it needs to be in normal mode, the shr mode is only for the fast airtronics servos

Can anyone explain to me exactly when one would be inclined to use the Adjustable Rate Control for steering or throttle, rather than using the exponential adjustsment? For the life of me I cannot understand what the manual is on about when it states that
"ARC is similar in function to Expo, however, ARC allows you to move & pinpoint the neutral position anywhere between the Steering or Throttle stops, not just the centre." What the :confused:

They have just about the same scenario for use of ARC as for Expo, if car is understeering (or for throttle, if the engine is weak & the track is very grippy, for example), increase ARC (just as one would do with Expo, right?). I don't get it - what is the benefit of being able to move the 'neutral' position?? Isn't neutral ALWAYS when the steering/throttle is where it would be if your hand was not touching the control? Otherwise, if the steering neutral point is anywhere else, the wheel would be phyisically rotated some amount when trying to drive in a straight line.:weird:

I understand & use Expo very often, no probs there. What I don't get is how ARC is any better/different, going by the graph, it's just a simple straight line that has a slight bend at 1 point & then continuing with another straight line.

The most awesome thing the manual says about ARC is "The ARC function varies the amount of servo action with respect to manipulation of the steering wheel or throttle trigger." No shit Sherlock! :eek: What else could it do other than that??? Isn't that what ALL the controls do, essentially they are all varying the amount of servo movement, with respect to the amount of steering/throttle input.

Can someone please explain when they would use ARC instead of Expo & under what conditions & for what purpose. Or even if someone uses ARC all the time... something... please, help!

Do you need to run a voltage regulator with a 7.4 lipo or can the receiver handle it?

Which receiver? 451 yes, 451R no. Still, even though manual says no, I know of many who use 2S LiPo with their 451 with no ill effects. I guess it would be difficult to determine just what would constitute an ill effect though coz usually an rx will run or not, with 2.4GHz not much of a middle ground usually.

So no regulator with the 451r? I just don't want to fry anything but I don't want to use a regulator.

when you swicht to ssr mode you need to rebind the rx,check that,but me my ace dint work on ssr mode!!

Hi guys,

Sorry, but i am a little confused here. Some say that they are running in SHR mode with no issues but the other recommend that the SHR mode on the 451R will only work with Airtronics servos.

I intend to purchase a new M11x, but all my servos are either Savox or Hitec. I really don't want to purchase another set of airtronics servos and get a whole new bunch of servo horns along with that.

If everything else checks out, I'll get a new M11x and that will come with the newer 451R Rx.

Thanks for all the input so far, if someone could just help clear this confusion.

I'll try... On the 451R the high speed mode will only work with newer Airtronics/Sanwa servos. Otherwise all others need to run using the normal mode.

With the 451 though, all servos can use the high speed mode.

Of course, I am referring to digital servos only but anyone who spends the dough on a new M11x surely ain't gonna be running ancient analogue servos & if they try they deserve to have their new M11x, their new 451/R & their vehicle all spontaneously combust & then be put down (that's the moron being put down, just like the sick puppy he must be).:p:blush::D

anyone know were i can pick up an new aerial for the 451 recevier. thanks

got a new 451r..binded it with model 2...everything works fine...returned to model 1....it still works...anything i did wrong? it's suppose to work with model 2 only, right?

Any receiver bound to your transmitter will respond to your transmitter whenever both are powered on (the receiver and transmitter). If you're running 2 different vehicles, then you'd better make sure car 1 is off before you start running car 2. I've seen a car or 2 take off in the pit area.

The model memory only saves the settings that you have tailored to a specific car.

that's something sanwa should change.... i had a 3pm 2.4G and a dx3s before...each model memory worked only for a specific rx...

do they still all work when you have specific modelsset up in display mode ??

I bind mycars with specific model names and i have never tested this :confused:

theres two types of receivers

451 - normal mode works with analogue and digital servos (slower)
-shr mode works with all digital servos only


451R - normal mode works with all digital servos (no analogue servos)
-shr mode works with airtronics/sanwa fast servos only

hope that cleared it up.