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RC10B4/T4 Forum

Old 02-11-2009, 09:38 PM
  #6886  
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Default A few pics of my new FT T4..

...I finally finished my new FT T4 build. I had been racing for the last 3 months one I bought 2nd hand to see if I liked 2WD truck. I do like the class so I wanted to have my own build.


Build info:

FT T4
Mamba Max w/ 4600kV
Spektrum 3001
Hitec 7955 steering servo (overkill for the T4, I stole it from my MBX6 until I find something else.)
It will be run with SMC 2S 24C 5200 battery packs with the battery shifted to the front.







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Old 02-12-2009, 09:41 AM
  #6887  
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Originally Posted by nitro0619 View Post
what pinion gear is recomended for a 13.5 and 10.5 novak ribbed can motor using stock spur on T4? also does the motor plate need modified or will it bolt up no prob? buddy of mine seemed to be having an issue w/ the motor not lining up w/ the slots
Go to this site to figure out what gear ratios you should use for brushless Novak motors. All of the information there is based on info from Novak, so it may or may not apply to other motors.
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Old 02-12-2009, 01:41 PM
  #6888  
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Default hey

guys i need a little help whats a good set up for a t4 running a lipo battery pack and a speed passion system i havewe heard about a lite wieght system whats that
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Old 02-12-2009, 03:09 PM
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Mattnin,

Nice to see you are trying to get the most out of your Sentry (Im sure many people just use it to check top speed!).

Ive worked on full size race cars a fair bit and have used the g-g curve to evaluate driving style and car performance. A few comments:
- you have the braking and driving direction in your graph the wrong way around
- you are being a bit hard on yourself re: clumpng around the centre! There are two reasons: 1) in off road, the car spends a fair bit of time in the air when the only force is gravity 2) When you are driving in a straight line close to top speed your motor cant accelerate the car even though the tyres still have grip.
- looking at the graph, it appears you are doing very little braking in a straight line but this is normal with 2wds - the front tyres actually contribute to braking when they are at full lock. Hence the 'V' shape of the graph.

I have found it useful to create a graph of 'Total G'. This is the amount of g force from cornering and accel/brake combined. Using trig, it is sqrt(Ax^2 + Ay^2). Plot this on the same time axis as vehicle speed/RPM so you can see where you are around the track. Ideally, you want this to stay at a high level all around the track - it means you are driving at the limit of the tyres. You will see that it drops down on the straight (especially in stock class) but this is OK as you are at the limit of the motor.

The Sentry is a great tool and if you are prepared to spend a bit of time going through the data Im sure you will be able to improve your lap times!

L8r

Ray





Originally Posted by mattnin View Post
I thought some of you might like to see this. Using a Novak Sentry data logger in a FT T4 stock truck class with a Novak 13.5 motor, hole shot tires blue groove (I took 1st place, point series race), I constructed a G-G Diagram which shows a graphical representation of the g-forces acting on the truck during the race. It is a tool used by race car engineers, and we have the capability to do it with our RC race cars too.

A quick analysis shows a clumping of data points on acceleration during a RH turn. Since we are running clockwise at the track, this makes sense since we are turning 360 degrees more RH than LH. It also shows a massive clumping of data points in the center which means that during much of the race, there weren't high g-forces acting on the chassis at all which means I wasn't driving at the limit. A better G-G diagram would show much fewer data points in the center (the data would be more scattered) and would mean I would be driving at the limit more.

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Old 02-12-2009, 03:32 PM
  #6890  
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Originally Posted by RCHobbyGuy View Post
guys i need a little help whats a good set up for a t4 running a lipo battery pack and a speed passion system i havewe heard about a lite wieght system whats that
the best setup available is the 06 Cavalieri setup on the AE web site. I was told by Bill Martinez Customer Support Specialist Team Associated
that they are working on a light setup but its not worked out yet.
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Old 02-12-2009, 03:53 PM
  #6891  
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Originally Posted by mattnin View Post
I thought some of you might like to see this. Using a Novak Sentry data logger in a FT T4 stock truck class with a Novak 13.5 motor, hole shot tires blue groove (I took 1st place, point series race), I constructed a G-G Diagram which shows a graphical representation of the g-forces acting on the truck during the race. It is a tool used by race car engineers, and we have the capability to do it with our RC race cars too.

A quick analysis shows a clumping of data points on acceleration during a RH turn. Since we are running clockwise at the track, this makes sense since we are turning 360 degrees more RH than LH. It also shows a massive clumping of data points in the center which means that during much of the race, there weren't high g-forces acting on the chassis at all which means I wasn't driving at the limit. A better G-G diagram would show much fewer data points in the center (the data would be more scattered) and would mean I would be driving at the limit more.

I've been wondering about the data sentry thing. Is that the only graph you can do with G's? I was wanting it to produce a line graph so you could try to determine where a lap ends/begins (assuming your running consistent laps) so you could compare G's by lap sorta...or run by run so you can make a change then do a run and compare the two G's per run. I don't see how to get any use of the dots plotted graph.
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Old 02-12-2009, 03:58 PM
  #6892  
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Originally Posted by ray_munday View Post
Mattnin,

Nice to see you are trying to get the most out of your Sentry (Im sure many people just use it to check top speed!).

Ive worked on full size race cars a fair bit and have used the g-g curve to evaluate driving style and car performance. A few comments:
- you have the braking and driving direction in your graph the wrong way around
- you are being a bit hard on yourself re: clumpng around the centre! There are two reasons: 1) in off road, the car spends a fair bit of time in the air when the only force is gravity 2) When you are driving in a straight line close to top speed your motor cant accelerate the car even though the tyres still have grip.
- looking at the graph, it appears you are doing very little braking in a straight line but this is normal with 2wds - the front tyres actually contribute to braking when they are at full lock. Hence the 'V' shape of the graph.

I have found it useful to create a graph of 'Total G'. This is the amount of g force from cornering and accel/brake combined. Using trig, it is sqrt(Ax^2 + Ay^2). Plot this on the same time axis as vehicle speed/RPM so you can see where you are around the track. Ideally, you want this to stay at a high level all around the track - it means you are driving at the limit of the tyres. You will see that it drops down on the straight (especially in stock class) but this is OK as you are at the limit of the motor.

The Sentry is a great tool and if you are prepared to spend a bit of time going through the data Im sure you will be able to improve your lap times!

L8r

Ray

Just saw this after posting.. I guess I need to go back to math class! I guess the dots are useful, I just don't know how to read it. But I think you can export all the data to excel? then massage as you please...
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Old 02-12-2009, 04:27 PM
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Exporting to Excel is pretty easy, and then you can do a lot more with it. You can split up laps to compare one to another - this is probably the easiest way to look at the consistency of your driving.

What makes data logging really useful is if you can put it in a few different cars (or get different drivers to drive your car) and compare driving styles. If you can get a local hotshot to have a drive you will quickly be able to see where they are carrying more speed, braking earlier, whatever... it ownt necessarily make you a better driver but you will know where you have to work on your driving.

Ray


Originally Posted by speedsterblade View Post
Just saw this after posting.. I guess I need to go back to math class! I guess the dots are useful, I just don't know how to read it. But I think you can export all the data to excel? then massage as you please...
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Old 02-13-2009, 09:35 AM
  #6894  
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Originally Posted by ray_munday View Post
You can split up laps to compare one to another - this is probably the easiest way to look at the consistency of your driving.

Ray

Nice! that is what I'm looking for. ..and letting other drivers run and compare is a good ideal. Thanks.
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Old 02-13-2009, 11:25 PM
  #6895  
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FYI everyone,

I am selling an AE B4 roller in order to take out an absolute bombshell tomorrow for Valentine's. If anybody needs a spare car (or car + Speedo), check out my ad in the classifieds.

Thank you and goodnite.
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Old 02-14-2009, 08:00 AM
  #6896  
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how bout pic's
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Old 02-14-2009, 08:01 AM
  #6897  
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of the girl
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Old 02-14-2009, 10:29 AM
  #6898  
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After a few years away from 2wd truck I'm back and picked up a used T4 from a buddy. Here's the build. Nothing too crazy.
Attached Thumbnails RC10B4/T4 Forum-p2140002.jpg   RC10B4/T4 Forum-p2140003.jpg   RC10B4/T4 Forum-p2140006.jpg   RC10B4/T4 Forum-p2140008.jpg  
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Old 02-14-2009, 05:07 PM
  #6899  
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looking good, nice electrical layout. What motor are you running?
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Old 02-14-2009, 06:58 PM
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Originally Posted by speedsterblade View Post
Nice! that is what I'm looking for. ..and letting other drivers run and compare is a good ideal. Thanks.
It requires a bit of manual work within Excel to split up laps, but its not impossible. I typically use the throttle signal getting onto the main straight as the 'trigger' for each lap - use the first time it gets to 100% as the indicator that a new lap has started. Its a lot easier if you have also printed out the lap times as recorded by the tracks laptiming system because you can then cut straight to your fastest lap etc (better than sorting through 30 laps via Excel).

Ray
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