lrp spx stock spec
08-08-2009, 06:58 AM
#556
Seeing the you have all LRP equipment, I would suggest that you ask Burrito (Reto) of LRP. He knows.
And give him some specifics about your track(s).
Bill
08-08-2009, 07:03 AM
#557
SPX
My club has a few guys swithing between the same s/c's. Last week we ended we were in te 5's with the tc spec and ended up in the low 8's to get the advance on the spx to kick in. we all have TC5R's and one is an Mi3. The downfall is the motor runs like crazy ad the cars are sooo fast but HOT.
08-08-2009, 07:14 AM
#558
My club has a few guys swithing between the same s/c's. Last week we ended we were in te 5's with the tc spec and ended up in the low 8's to get the advance on the spx to kick in. we all have TC5R's and one is an Mi3. The downfall is the motor runs like crazy ad the cars are sooo fast but HOT.
Being in Florida...Do you have fans on your motors?
08-08-2009, 07:24 AM
#559
Still bill - Thanks will Do
Here in Malta sometimes we race in very hot temperatures (28-30 degress) and the motors at the end of the run are sometimes at 160 without fan. With two 30mm fans (the cool can fan ones) blowing directly on the motor motors temp is around 145 deg.
MAK - Thats a huge difference between the two speed controllers. I will have to try 13 teeth less on the pinion to get into the 8's.
Here in Malta sometimes we race in very hot temperatures (28-30 degress) and the motors at the end of the run are sometimes at 160 without fan. With two 30mm fans (the cool can fan ones) blowing directly on the motor motors temp is around 145 deg.
MAK - Thats a huge difference between the two speed controllers. I will have to try 13 teeth less on the pinion to get into the 8's.
08-08-2009, 07:27 AM
#560
Larger rotor = more torque, Smaller rotor = more RPM.
The larger the rotor, the magnet in the rotor moves closer to the stack/winding, thus more magnetic pull to each poll, while just the opposite with a smaller rotor.
My SPX quit working properly, does not do the accelerated timing on profiles 6, 7, and 8 anymore, and instead works almost like a normal sphere now. Anyone else experience this?
The larger the rotor, the magnet in the rotor moves closer to the stack/winding, thus more magnetic pull to each poll, while just the opposite with a smaller rotor.
My SPX quit working properly, does not do the accelerated timing on profiles 6, 7, and 8 anymore, and instead works almost like a normal sphere now. Anyone else experience this?
08-08-2009, 10:10 AM
#561
My club has a few guys swithing between the same s/c's. Last week we ended we were in te 5's with the tc spec and ended up in the low 8's to get the advance on the spx to kick in. we all have TC5R's and one is an Mi3. The downfall is the motor runs like crazy ad the cars are sooo fast but HOT.
mine is 260m long , fast and flowing and i use 4.0 gearing on profile 7
am i missing something ??? my car is fast but is there something i need to try ??
08-08-2009, 10:36 AM
#562
i think this speedo is a little wierd and i cant understand it
i have a TRF416we with a GM 13.5 and an SPX on program 7 and gearing 4.0
my mate has an XRAY009 again with a GM 13.5 and an SPX on program 7 with gearing 4.4
we are both the same speed and punch out of the corners !!!!
how can this be ????
if i switch to gearing 4.1 or 3.9 i have nothing !!!!!
i have a TRF416we with a GM 13.5 and an SPX on program 7 and gearing 4.0
my mate has an XRAY009 again with a GM 13.5 and an SPX on program 7 with gearing 4.4
we are both the same speed and punch out of the corners !!!!
how can this be ????
if i switch to gearing 4.1 or 3.9 i have nothing !!!!!
most speedo's have a small sweet spot because the timing parameters set on the speedo is linear with throttle input while the spx will set your timing where you can get maximum power based on three inputs,throttle, amp draw & rpm.
Last edited by R1wurks; 08-08-2009 at 11:59 AM.
08-08-2009, 11:11 AM
#563
this speedo reads the amp draw from your motor & has a pre set timing map depending on what RPM & AMP your drawing to the motor. now when you are geared that close the each other, your speedo optimizes your powerband therefore makes the "normal" gear ratio difference almost non existent until you fall outside that power band window.
most speedo's have a small sweet spot because the timing parameters set on the speedo is linear with throttle input while the spx will set your timing where you can get maximum power base on three inputs,throttle, amp draw & rpm.
most speedo's have a small sweet spot because the timing parameters set on the speedo is linear with throttle input while the spx will set your timing where you can get maximum power base on three inputs,throttle, amp draw & rpm.
Now, different turn motors have different maximum RPM, so how does it take this into account ?
?
08-08-2009, 11:20 AM
#564
Your explanations are what I usually look for but most people don't know these things (or think in terms of "if you do this, then this will happen" without explaining why). That being said, I am really curious to know how you know this stuff because I only see two ways. Either extensive experimentation or access to inside info. Which is it?
08-08-2009, 11:24 AM
#565
08-08-2009, 11:50 AM
#566
08-08-2009, 11:58 AM
#567
So you reckon the power band is that narrow ? I am not sure I understand this passage.
Your explanations are what I usually look for but most people don't know these things (or think in terms of "if you do this, then this will happen" without explaining why). That being said, I am really curious to know how you know this stuff because I only see two ways. Either extensive experimentation or access to inside info. Which is it?
Your explanations are what I usually look for but most people don't know these things (or think in terms of "if you do this, then this will happen" without explaining why). That being said, I am really curious to know how you know this stuff because I only see two ways. Either extensive experimentation or access to inside info. Which is it?
08-08-2009, 01:08 PM
#568
I have read on a few other threads where the SPX looses profiles 6, 7, and 8 after awhile. Some SPX drivers are replacing their speedos quite often because of this. Have you tried your SPX with another motor and had the same effect (loss of profiles?) Could this be a heat issue over time that makes this happen? I'm wondering if running the heat sink on the ESC would keep this problem from occuring. Just trying to gather more data on how this happens so that it can be avoided in the future.
08-08-2009, 01:37 PM
#569
I have read on a few other threads where the SPX looses profiles 6, 7, and 8 after awhile. Some SPX drivers are replacing their speedos quite often because of this. Have you tried your SPX with another motor and had the same effect (loss of profiles?) Could this be a heat issue over time that makes this happen? I'm wondering if running the heat sink on the ESC would keep this problem from occuring. Just trying to gather more data on how this happens so that it can be avoided in the future.
08-08-2009, 02:36 PM
#570
What temp will it thermal?
Does anybody know what temp the SPX will thermal at?