R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 12-30-2010, 02:17 PM   #19036
Tech Regular
 
Join Date: Jul 2003
Location: Boulder City
Posts: 311
Trader Rating: 5 (100%+)
Default DHI Cup

For those of you attending the DHI cup what set-up have you come up with for 17.5? I am going to be practicing this weekend and start with Hara’s 17.5 from the IIC and tune from there.

Thanks,

Patrick
XCELL is offline   Reply With Quote
Old 12-30-2010, 02:22 PM   #19037
Tech Adept
 
Join Date: Nov 2010
Posts: 185
Default

Quote:
Originally Posted by hijinx View Post
Hey there all, just wondering if the GM 13.5t motors work fine with the Tekin Pro?? If so what would be a awesome fdr and tekin settings up for a Hotbodies TCX, running on a large fast flowing asphalt track with rubber tyres??
Any help will be awesome
Cheers
Yes they work verry good with the Tekin.

I tried the motor and it runs good and it is fast.
I used a lower Boost and a havier gearing.
toptek is offline   Reply With Quote
Old 12-30-2010, 02:38 PM   #19038
Tech Addict
 
Join Date: Nov 2009
Location: Denmark
Posts: 562
Default

Quote:
Originally Posted by XCELL View Post
For those of you attending the DHI cup what set-up have you come up with for 17.5? I am going to be practicing this weekend and start with Hara’s 17.5 from the IIC and tune from there.

Thanks,

Patrick
I am going to attend DHI Cup, and I have used the SP V3 17.5T through-out this winter-season.
My experience is that is can handle a lot of timing, but it also needs a lot of timing to go fast. I think Hara's setup will be good. My setup is a bit extreme, and keep an eye on the temps if using mine (my motor is only getting 57 deg celcius after 6 min, but I think that it can get hotter on the larger DHI Cup track).

My setup:
Boost: 50
Start: 5.000
End: 15.000
Turbo: 15
Delay: 0.25
Ramp: 3.0
FDR: 5.7
Motor-timing: 10

Hara's setup isn't as extreme, and is very smooth. So it should be a good starting point. I would recommend you to use 10 motor-timing - the SP V3 really comes to life when using 10 on the endbell.
__________________
Niklas Hansen
Team TCHobby / Team Upgrade-RC
Tamiya TRF417 / Speed Passion GT2.0 / Speed Passion V3 motors.
Nilks is offline   Reply With Quote
Old 12-30-2010, 02:53 PM   #19039
Tech Regular
 
Join Date: Jul 2003
Location: Boulder City
Posts: 311
Trader Rating: 5 (100%+)
Default

Thanks for the information, been trying to gather as much set-up info possible. Looking forward to this race.

Patrick
XCELL is offline   Reply With Quote
Old 12-30-2010, 06:32 PM   #19040
Tech Regular
 
twk-b's Avatar
 
Join Date: Nov 2008
Location: calgary
Posts: 379
Trader Rating: 1 (100%+)
Send a message via MSN to twk-b
Default

Spent some time over the holidays and wrote a gearing app for Android... which I just finished adding to the Android Market.

The reason I am posting it here is because it comes with some features I have found handy since having my Tekin RS, along with being able to store your settings for it (so when someone asks you do not need to plug it in

I found often when changing up gearing, it messed up my RPM range that I had just perfected. By doing the math I found that if I calculated the speed based on RPM and FDR/Rollout and then reversing it with the new FDR/Rollout the boost seemed to work the same (and the motor temperatures too).

So this app shows the speed for your boost start and boost end (in km/h). After changing your Rollout/FDR you can adjust the RPM values to restore the speeds the boost affecting the car....

From my experience (carpet 80x36) the lower boost number is the apex speed on the slowest corner (and on our carpet track varies from about 12-20 km/h), and the max the speed at about 1/2 or 2/3 the straight (25 - 60km/h)

Big difference over gearing apps are:
* you to quickly skip throw spur/pinions using the volume buttons...
* you can calculate the pinion (using the set spur and tire diameter) from a given Rollout or FDR
* you can see the speed your boost start/end at before and after gearing changes which allowing you to correct the range (useful for Tekin RS and other boosted ESCs allowing RPM configuration)
* you can stop guessing which spur to switch to with the gear chart you can see which spur gives you the ratios with your pinions
* you can forget your settings because TwitchRC remembers them for you.

A future version will allow you to download setups to view/edit.

The homepage for TwitchRC is here:
http://bernie.dcbl.ca/wiki/wiki.php?...c&cscid=35&r=1

RC Tech thread for feedback and updates:
http://www.rctech.net/forum/electric...c-android.html

-b
twk-b is offline   Reply With Quote
Old 12-30-2010, 07:17 PM   #19041
Tech Adept
 
Join Date: Nov 2010
Posts: 185
Default

Quote:
Originally Posted by twk-b View Post
Spent some time over the holidays and wrote a gearing app for Android... which I just finished adding to the Android Market.

The reason I am posting it here is because it comes with some features I have found handy since having my Tekin RS, along with being able to store your settings for it (so when someone asks you do not need to plug it in

I found often when changing up gearing, it messed up my RPM range that I had just perfected. By doing the math I found that if I calculated the speed based on RPM and FDR/Rollout and then reversing it with the new FDR/Rollout the boost seemed to work the same (and the motor temperatures too).

So this app shows the speed for your boost start and boost end (in km/h). After changing your Rollout/FDR you can adjust the RPM values to restore the speeds the boost affecting the car....

From my experience (carpet 80x36) the lower boost number is the apex speed on the slowest corner (and on our carpet track varies from about 12-20 km/h), and the max the speed at about 1/2 or 2/3 the straight (25 - 60km/h)

Big difference over gearing apps are:
* you to quickly skip throw spur/pinions using the volume buttons...
* you can calculate the pinion (using the set spur and tire diameter) from a given Rollout or FDR
* you can see the speed your boost start/end at before and after gearing changes which allowing you to correct the range (useful for Tekin RS and other boosted ESCs allowing RPM configuration)
* you can stop guessing which spur to switch to with the gear chart you can see which spur gives you the ratios with your pinions
* you can forget your settings because TwitchRC remembers them for you.

A future version will allow you to download setups to view/edit.

The homepage for TwitchRC is here:
http://bernie.dcbl.ca/wiki/wiki.php?...c&cscid=35&r=1

RC Tech thread for feedback and updates:
http://www.rctech.net/forum/electric...c-android.html

-b
Looks nice.
I have only 1 question. are the numbers behind the rpm's the speed in km/h? and are they right on the screenshot?
I made a topspeed calculater bassed on top rpm meassured with an rpm meter on the car.
As I fill in your info, than I get slower speeds.
toptek is offline   Reply With Quote
Old 12-31-2010, 04:29 AM   #19042
Tech Adept
 
StevenOlsen's Avatar
 
Join Date: Oct 2007
Location: Denmark
Posts: 176
Default

Quote:
Originally Posted by XCELL View Post
For those of you attending the DHI cup what set-up have you come up with for 17.5? I am going to be practicing this weekend and start with Hara’s 17.5 from the IIC and tune from there.

Thanks,

Patrick
Quote:
Originally Posted by Nilks View Post
I am going to attend DHI Cup, and I have used the SP V3 17.5T through-out this winter-season.
My experience is that is can handle a lot of timing, but it also needs a lot of timing to go fast. I think Hara's setup will be good. My setup is a bit extreme, and keep an eye on the temps if using mine (my motor is only getting 57 deg celcius after 6 min, but I think that it can get hotter on the larger DHI Cup track).

My setup:
Boost: 50
Start: 5.000
End: 15.000
Turbo: 15
Delay: 0.25
Ramp: 3.0
FDR: 5.7
Motor-timing: 10

Hara's setup isn't as extreme, and is very smooth. So it should be a good starting point. I would recommend you to use 10 motor-timing - the SP V3 really comes to life when using 10 on the endbell.
tryed nilks sertup yesterday, and changed a bit
boost 50
start 2800
end 12000
turbo 15
delay 0,2
ramp 2
fdr 5,6 use as small spur as plausebul
motor timing 10
motor comes off around 70 degress celcius.
__________________
Steven Olsen
CAR: Awsomatix A700L.
Nosram 7000 Batteries.
Nosram Comet HD ESC.
Nosram Pure 2 evolution Motor.
StevenOlsen is offline   Reply With Quote
Old 12-31-2010, 07:51 AM   #19043
Tech Adept
 
Join Date: Nov 2010
Posts: 185
Default

I tried today the AE BD speedo. It drives smooth but I can say that Tekin did a great job. It is not as smooth as the BD but the infield speed is the same and the straight speeds are faster.
I used the SP motor because the BD owner had that motor so we didn´t had to solder it to compare it with the Tekin.
To keep up with the Tekin, you must drive verry good in the infield els you loose to much and you can´t fight your way back.
The Tekin drives easier fast. With the BD I had to push each lap to stay ahead of the Tekins. I became second and that is the first time I lost a race in the last 3 years. It was just a trainings race but normally I´m always ad the nr1 spot.
I changed back to the Tekin to put some fast lap times. The one that won from me changed to the BD. He was impressed of the feeling but not the speed of the speedo.
He became 3th behind 2 Tekins.
Changed the motor back to my Tekin redline and improved my own track record with 0,1sec.

My setup with both motors was.
Boost 50
Turbo 15
Turbo delay 0,1 turbo ramp 2
Start rpm around the 6000
End rpm 12500
gearing with the SP 7.0FDR
with the Tekin 7,4FDR
Motor timing SP 10
Motor timing Tekin around the 8
The Tekin was smoother and it was fast.
The Tekin combo made the other cars look like silvercan drivers.
The Tekin motor drives like no other motor. best motor I have ever had.
I hope that the new motor drives like the redline.

The wider RPM range works good. Motor stays cooler and I could use more motor timing.
toptek is offline   Reply With Quote
Old 12-31-2010, 09:27 AM   #19044
Tech Regular
 
twk-b's Avatar
 
Join Date: Nov 2008
Location: calgary
Posts: 379
Trader Rating: 1 (100%+)
Send a message via MSN to twk-b
Default

Quote:
Originally Posted by toptek View Post
Looks nice.
I have only 1 question. are the numbers behind the rpm's the speed in km/h? and are they right on the screenshot?
I made a topspeed calculater bassed on top rpm meassured with an rpm meter on the car.
As I fill in your info, than I get slower speeds.
Thanks for taking a look.

The numbers should be right, I plunked them into my app and those are still the numbers it is still kicking out. I have not checked that 66mm is the right size for the Jaco Blue tires (i found that in a post on RC tech).

Does your math on the rollout match? I will double check the formula I am using for speed... can you give me the tire diameter/rollout/revs/speed you are using in your calculations?

Thanks again for the feedback.

-b
twk-b is offline   Reply With Quote
Old 12-31-2010, 10:52 AM   #19045
Tech Adept
 
Join Date: Nov 2010
Posts: 185
Default

Quote:
Originally Posted by twk-b View Post
Thanks for taking a look.

The numbers should be right, I plunked them into my app and those are still the numbers it is still kicking out. I have not checked that 66mm is the right size for the Jaco Blue tires (i found that in a post on RC tech).

Does your math on the rollout match? I will double check the formula I am using for speed... can you give me the tire diameter/rollout/revs/speed you are using in your calculations?

Thanks again for the feedback.

-b
I use the same info that you use.
I get with the start rpm 12.86km/h
and with the end rpm 51.45km/h

tire diameter 66
fdr 6.96
start rpm 5000
end rpm 20000

It is possible that I make a misstake.
I used for calculating the tire 3.147*D

I have no Ipohne but I use excel on my laptop.
I make my own gear info sheets.
toptek is offline   Reply With Quote
Old 12-31-2010, 03:58 PM   #19046
Tech Regular
 
twk-b's Avatar
 
Join Date: Nov 2008
Location: calgary
Posts: 379
Trader Rating: 1 (100%+)
Send a message via MSN to twk-b
Default

Quote:
Originally Posted by toptek View Post
I use the same info that you use.
I get with the start rpm 12.86km/h
and with the end rpm 51.45km/h

tire diameter 66
fdr 6.96
start rpm 5000
end rpm 20000

It is possible that I make a misstake.
I used for calculating the tire 3.147*D

I have no Ipohne but I use excel on my laptop.
I make my own gear info sheets.
Good to hear others have discovered this little secret for getting the car dialed. No different then having to adjust ride height after adjusting shock positions.....

I was using 3.14159 but have changed it to 3.141592654 (avail in next version). I am guessing when that small difference is multiplied by 5000 or 20000 revolution it adds up to the difference?

-b
twk-b is offline   Reply With Quote
Old 12-31-2010, 04:13 PM   #19047
Tech Adept
 
Join Date: Nov 2010
Posts: 185
Default

Quote:
Originally Posted by twk-b View Post
Good to hear others have discovered this little secret for getting the car dialed. No different then having to adjust ride height after adjusting shock positions.....

I was using 3.14159 but have changed it to 3.141592654 (avail in next version). I am guessing when that small difference is multiplied by 5000 or 20000 revolution it adds up to the difference?

-b
no I think it is in something els
But I think that there is a mistake in my formula.

I use this formula in excel

((rpm*60)/(FDR*FDR))*((3,14*D)/100000))=KM/H
I think that I make a mistake with the FDR. But I don't now for sure.
toptek is offline   Reply With Quote
Old 12-31-2010, 08:39 PM   #19048
Tech Regular
 
Dragula426's Avatar
 
Join Date: May 2008
Location: USA
Posts: 351
Trader Rating: 4 (100%+)
Default

Roll Out = PI x Tire Dia / Gear Ratio(including trans ratio)

Ave Per Lap = #minutes x 60sec / # of actual Laps

Ave RPM per lap = [(Size of track in ft) x (12 inches/ft) x (#Laps) / (#min)] / Rollout

Peak RPM = Ave RPM x 1.10 (or 10% beyond what you will use)

I use Peak RPM as my upper limit to start with so you usually hit the peak accel just before the turn. Seems to get me close, and then I tweek it from there. I keep track of all the lengths of the tracks I race at and all the settings i run. It helps me see where I want to be....

Now here is the interesting part, once you know a track to gear for it, you can reverse the formula a little when you see someone hit more laps than you ..... And you can gear for a targeted number of laps, but you need to be careful, because formulas and real world testing are two different games and you can toast a motor if your not close already.

You guys would freak if you took a look at my huge spread sheet I keep track of everything with.

All the cycles on my batteries on one tab, all the tracks, motors, rolllouts and gearing on another, and lastly a page for the car set-up from week to week, and I have 5 cars currently, so that's one for each car just about.
__________________
Team Tekin
Jeffery Racing Concepts
Little 'O' Speedway
Extreme Graffix
Dragula426 is offline   Reply With Quote
Old 12-31-2010, 10:30 PM   #19049
Tech Master
 
Join Date: Jan 2009
Location: Hagerstown, MD
Posts: 1,699
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by toptek View Post
no I think it is in something els
But I think that there is a mistake in my formula.

I use this formula in excel

((rpm*60)/(FDR*FDR))*((3,14*D)/100000))=KM/H
I think that I make a mistake with the FDR. But I don't now for sure.
there would have to be a mistake in that somewhere, but i dont think its the fdr because if it wasnt fdr multiplied by fdr it would make your speeds come out lower, i used my peak rpm in the formula and it said i was only running a top speed of 24.2 KM/H then i converted that to MPH being the main measure of speed in my area, it came to 15.24, there is no way my car is that slow
__________________
★Randy Banks★
COLD AS ICE is offline   Reply With Quote
Old 01-01-2011, 07:43 AM   #19050
Tech Adept
 
Join Date: Nov 2010
Posts: 185
Default

I got it.

((rpm*60)/(FDR))*((3,14*D)/10000))/60=KM/H
this formula is right. now I get the same results.

Last edited by toptek; 01-01-2011 at 08:07 AM.
toptek is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tekin Redline RS Sensored ESC and motors, opinions for offroad? Cain Electric Off-Road 4230 06-07-2015 04:38 PM
Sensored vs. Sensorless lemansracer Electric On-Road 71 02-14-2009 03:19 AM
New Tekin Redline Sensored Motors are Roar Legal! Randy_Pike Electric On-Road 3 08-05-2008 02:08 AM
Tekin Redline Sensored 10.5 HUCKMAN Electric On-Road 6 07-15-2008 08:50 PM
sensored vs sensorless bprocket Rookie Zone 5 05-16-2008 09:38 AM


Tags
v203, vegas 2.0


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 04:40 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net