R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 06-02-2009, 07:25 AM   #1
Tech Adept
 
Join Date: Feb 2007
Posts: 240
Default Foam Setup VS> rubber setup

hey guys,

my R40 handles on rails with the foams, but man they get torn up in 2-3 tanks... i have a set of slicks and on the same setup they are terrible... why is this?? and is there a netural rubber setup???(should i run rubber with almost not camber pretty flat?) im running an asphault, and also with the rubber tires, i have glued and re glued the tires to the rims and for some reason the keep on comming unglued from the rim(im using that brown tire glue) any helpful hints on this also... im running the R40HE w/ Red dot combo
__________________
Hpi R40 Hara w/ .12JLR
Hpi R40-rolling frame
Tamyia F103 LM -Ole school
soon a 1/8th on road
Duratrax Maximum ST Pro
Hpimichael is offline   Reply With Quote
Old 06-02-2009, 08:47 AM   #2
Tech Regular
 
Join Date: Nov 2008
Location: Virginia, USA
Posts: 480
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by Hpimichael View Post
hey guys,

my R40 handles on rails with the foams, but man they get torn up in 2-3 tanks... i have a set of slicks and on the same setup they are terrible... why is this?? and is there a netural rubber setup???(should i run rubber with almost not camber pretty flat?) im running an asphault, and also with the rubber tires, i have glued and re glued the tires to the rims and for some reason the keep on comming unglued from the rim(im using that brown tire glue) any helpful hints on this also... im running the R40HE w/ Red dot combo
Ok....a couple of questions...

What rubber tires are you using and what type of inserts are you using with them.
The 24mm racing slicks

or the Sedan slicks

Are the rubber tires on dish or sedan rims.
These:

Or something like these:

Are the rims chrome, if so scrape the chrome off the inside of the rime. CA glue does not stick well to that stuff. Use these CA glue types to glue your tires.


Don't put globs of it on rim but just a thin line around the rim. Let tire set a full day before using.

Foams tires naturally have more traction than rubbers, so the same setup would not work well for rubber tires. (I wanted to just say rubbers, but someone might get confused)

Also, the rubber tires, unless belted, expand slightly (balloon up) on hard acceleration. This will cause loss of traction, especially on parking lot courses also the rubber tires have different softness for different temperatures. Use softer on cooler days. Don't forget to warm up your rubbers with a few hot laps before your race or with a tire warmer and some secret sauce helps too

The foam tires typically have a wider footprint as well, which gives more traction. So with all that said....yes, you need to chance setup when switching from foam to rubbers. Hope this helps you out.
Kyo83 is offline   Reply With Quote
Old 06-02-2009, 08:53 AM   #3
Tech Master
 
rcrevolution's Avatar
 
Join Date: Jul 2005
Location: Somewhere Delicious
Posts: 1,281
Trader Rating: 1 (100%+)
Send a message via AIM to rcrevolution
Default

just get a harder shore foam tire so they last a little longer....
rcrevolution is offline   Reply With Quote
Old 06-02-2009, 08:53 AM   #4
Tech Regular
 
jeff1's Avatar
 
Join Date: Oct 2004
Posts: 377
Default

for rubber I set my camber so the tires wears flat, even in the rear. Diff I go with 80000 front and 5000 rear
if they spray something on the track this should reduce the grip with rubber
use the correct pulley to obtain 0 overdrive
I use Pro-line glue and never had any problem. I used to wash the rims with alcohol and sand the part that will glue on tire before glue
jeff1 is offline   Reply With Quote
Old 06-02-2009, 09:13 AM   #5
Tech Adept
 
Join Date: Feb 2007
Posts: 240
Default

im using racing slicks with dish rims(white)

thanks for the tips and tricks i will put the to use today
__________________
Hpi R40 Hara w/ .12JLR
Hpi R40-rolling frame
Tamyia F103 LM -Ole school
soon a 1/8th on road
Duratrax Maximum ST Pro
Hpimichael is offline   Reply With Quote
Old 06-02-2009, 09:22 AM   #6
Tech Master
 
rcrevolution's Avatar
 
Join Date: Jul 2005
Location: Somewhere Delicious
Posts: 1,281
Trader Rating: 1 (100%+)
Send a message via AIM to rcrevolution
Default

i have used anywhere from 32 shore to 44 shore and the 32 shore lasted me about 20 laps if that and chunked on regular asphault, the 44 shore lasted me a few weeks and never chunked the grip was less, but still WAAAYY more than rubber can offer.
rcrevolution is offline   Reply With Quote
Old 06-02-2009, 09:28 AM   #7
Tech Regular
 
Join Date: Nov 2008
Location: Virginia, USA
Posts: 480
Trader Rating: 3 (100%+)
Default

You can also purchase something like these to help reduce chunking of your foam tires:


http://cgi.ebay.ca/SPEEDMIND-Foam-ti...ayphotohosting

Some of the nicer brands already come with them on or in box.

Last edited by Kyo83; 06-02-2009 at 09:38 AM. Reason: added info
Kyo83 is offline   Reply With Quote
Old 06-02-2009, 09:49 AM   #8
Tech Master
 
rcrevolution's Avatar
 
Join Date: Jul 2005
Location: Somewhere Delicious
Posts: 1,281
Trader Rating: 1 (100%+)
Send a message via AIM to rcrevolution
Default

yep, those are nice they dont always work right though when they start peeling.
rcrevolution is offline   Reply With Quote
Old 06-02-2009, 09:53 AM   #9
Tech Adept
 
Join Date: Feb 2007
Posts: 240
Default

yea my foams are chunking on the outer of the wheel where the line in the foam tire is(the last .25") the fronts are fine perfect its just the rear, i have it set up for a sweeping left hander at 1/2 throttle that goes into a tight left hander and around the coldesac so the rear right gets the worst wear .... and i have no clue what the stock R40HE foams shore is(im thinking like 35)
__________________
Hpi R40 Hara w/ .12JLR
Hpi R40-rolling frame
Tamyia F103 LM -Ole school
soon a 1/8th on road
Duratrax Maximum ST Pro
Hpimichael is offline   Reply With Quote
Old 06-02-2009, 10:01 AM   #10
Tech Master
 
rcrevolution's Avatar
 
Join Date: Jul 2005
Location: Somewhere Delicious
Posts: 1,281
Trader Rating: 1 (100%+)
Send a message via AIM to rcrevolution
Default

think of it this way where rubber tires can grip 1-5 and foams 6-10, the hardest foam tire will still grip about a 7 where as the best rubber tire will grip about a 5, I leave rubber tires to low power nitros or prepared tracks for electrics.
rcrevolution is offline   Reply With Quote
Old 06-02-2009, 10:13 AM   #11
Tech Regular
 
Join Date: Nov 2008
Location: Virginia, USA
Posts: 480
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by Hpimichael View Post
yea my foams are chunking on the outer of the wheel where the line in the foam tire is(the last .25") the fronts are fine perfect its just the rear, i have it set up for a sweeping left hander at 1/2 throttle that goes into a tight left hander and around the coldesac so the rear right gets the worst wear .... and i have no clue what the stock R40HE foams shore is(im thinking like 35)
Sound like you have a high traction track....do like rcrevolution suggested and try a harder shore tire.....37 or 40 should do the trick. The Original tire was a 40 shore
#4365 HPI PRO FOAM TIRE 30MM REAR E (40) W/WHT MESH (PR)


I can't imagine you're still using the original tire after all these years, though.
Kyo83 is offline   Reply With Quote
Old 06-02-2009, 10:19 AM   #12
Tech Adept
 
cobrajet's Avatar
 
Join Date: Apr 2009
Location: Clermont fl
Posts: 189
Trader Rating: 4 (100%+)
Default

Stocks are 40 shore. I ran 33/37 combo last race @ 90 and only lost 2mm out of the whole day. Try better foams.
cobrajet is offline   Reply With Quote
Old 06-02-2009, 11:17 AM   #13
Tech Adept
 
Join Date: Feb 2007
Posts: 240
Default

Quote:
I can't imagine you're still using the original tire after all these years, though
hahah yea i got two more of these sets, i put my R40 on the shelf mid 2007 and just got it out again... so ima try a harder shore or a better area to race on....
__________________
Hpi R40 Hara w/ .12JLR
Hpi R40-rolling frame
Tamyia F103 LM -Ole school
soon a 1/8th on road
Duratrax Maximum ST Pro
Hpimichael is offline   Reply With Quote
Old 06-02-2009, 06:40 PM   #14
Tech Elite
 
fastharry™'s Avatar
 
Join Date: Sep 2001
Location: Mahwah, NJ.. USA!! ..... Home of http://www.fastharry.com
Posts: 2,846
Trader Rating: 4 (100%+)
Send a message via Skype™ to fastharry™
Default

Michael....

Foam tires on race cars are used so you don't have the overheating problem when driving the car hard...but they have a downside, as they need to be used on a smooth track that has traction compound applied. On a treated smooth track, they respond better than a rubber tire would on that same treated track.

Since they have so much traction,and are more consistent than rubber tires, the cars can be set up with less body roll so they respond quicker, and develop more cornering speed than rubber tired car would....

And that is why your R40 does not handle as well with rubber tires. Not enough chassis roll to get traction.

You can run rubbers, but you need to get more roll in the car using the camber links, springs, and roll center adjustments....


in other words, the car has to be set-up like a Rs4 3, which is designed for rubber tires on dusty streets....and has chassis roll to get traction.




As for gluing the tires, make sure you wash the tires and rims in soapy water and I scrub the beads with a tooth brush. Use a FRESH bottle of glue that is designed to get rubber to adhere to nylon or plastic rims....ordinary CA won't cut it.

I have found that Losi med tire cement works real well.....Pull the tire back and let the glue wick in...Let it dry 24 hours, and then lay a bead around the tire and rim and let that dry for 24 hours...


after you are done, put the losi glue in the fridge to keep it fresh......
__________________
www.fastharry.com---search "fastharry" on facebook
See Fastharry in Super Nitro racing at the HPI CHALLENGE...
http://www.youtube.com/watch?v=jzo-cBEnE0c
fastharry™ is offline   Reply With Quote
Old 06-02-2009, 06:59 PM   #15
Tech Elite
 
rcfoolz's Avatar
 
Join Date: Sep 2003
Posts: 3,327
Trader Rating: 22 (100%+)
Send a message via Yahoo to rcfoolz
Default

last weekend, I tried a set of the Impanama 1/10th rubber tires, shore 45's. The car was good for the first 3 or 4 laps then they get hot and greasy. This past weekend, I tried something else, by letting the car roll more, like the post above me stated, like an electric car would and the car was excellent,......however........it was a trick to balance the tire spin with the higher powered .12 engine. The best thing would be to make a VERY soft clutch and go with a low power engine.

Good luck.
__________________
Am I going back racing?...Hmmm.. Not anytime soon... But soon enough.
rcfoolz is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Major races would fewer be better? teammidget lilB Electric On-Road 69 12-02-2008 08:55 PM
Speedpassion Brushless. razzor Electric On-Road 928 01-22-2008 09:27 AM



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 06:28 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