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5/13/2014 3:00 pm  #1


Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/DRSVRaptor20.jpg

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/DRSVR20.jpg

So this is my new Velociraptor 20... 0-60 &660 times are virtually the same for both 1000' track & 1/4 mi, only major difference is more mph on 1/4 mi. Chassis is DRS-SW01, geared 14/52, 1" .300 tires w/DRS '53 Studebaker lexan body. I don't think it is fast enough. It has been suggested that I go to a 15 tooth pinion, or go to a taller tire. Can some of you wise veterans give me some feedback & sugggestions??? I haven't weighed it yet, but I am sure it is below 100 g. BTW this time is from the 1000' track.

Last edited by Macman (5/13/2014 3:04 pm)


Formerly of SARN
 

5/14/2014 7:19 am  #2


Re: Suggestions... not fast enough

Something is wrong Macman....  The 60' is way off for being that light...  We run a 125 hardbody class out here and we are running .700's.  We ran a 75 gram lexan funny car class and Joe Cardoza and I dipped into the .5 second range with those....

Looking at your chassis, I would add "struts" or down bars to the wheelie bars just to stiffen the back half a bit...  These motors pound the bars pretty good when they are hooked up... 

For the funny car, I was geared 18/56 with a 1.030 x .400 wide tire.  With the 125 gram car, I'm geared 13/56.  Motors were stock out of the bag (ProSlot does a pretty good job with these motors) with the only additions being shunt wire and grooving the brush for the shunt wire. 

Looking at your short and 1/2 track times tells me you are probably spinning the tire.... It takes a LOT to bog these motors especially if you have a light car....  With my lexan car I was in the low .090-high .08 range and with the hardbody car, I am in the high .09-low .10 range....  At the time we raced the lexan cars, we didn't have 660' timers, so I can't help you there, but with the hardbody cars we are in the low .420 range at half track and around 79 mph out the back door....

Hope that helps point you in the right direction....

 

5/14/2014 6:35 pm  #3


Re: Suggestions... not fast enough

Thanks Gary, yes it is spinning, with glue, at both tracks... I will stiffen up the wheelie bar area... So would going to a .453 wide Tire help?


Formerly of SARN
     Thread Starter
 

5/15/2014 12:19 am  #4


Re: Suggestions... not fast enough

Yes, a .435 tire will help....  Set your bars pretty tight.... I set mine to where they are barely touching the track, but still able to turn....  I haven't run one of those chassis in a long time, but I did add struts to the wheelie bars and  I used to pin the body through the front wheels....  Hope that helps a little....

 

5/15/2014 3:26 pm  #5


Re: Suggestions... not fast enough

I have a 97g hardbody vr20 geared 13/60
1x1/16x500 60ft. .885
et-460 @56mph 1/8 mile
let me know if that is in the ballpark thanks.
 

 

5/15/2014 4:39 pm  #6


Re: Suggestions... not fast enough

Here's the incrementals from one of my passes.... 

http://i47.photobucket.com/albums/f181/67vwracer/Mobile%20Uploads/image_zps59d1bc47.jpg


And here is the car....

http://i47.photobucket.com/albums/f181/67vwracer/image_zpsf89bb3e7.jpg

 

5/25/2014 10:28 am  #7


Re: Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/524results.jpg

Last nights results, changed to 13 pinion, .435 tires & added new braid. Used lots of glue, enough to bogg a gp 20. Results from Slot Car Cave's 1000' track Going to Slot Shots1/4 mile for testing wed night... & prep for index racing Saturday.


Formerly of SARN
     Thread Starter
 

5/28/2014 9:58 pm  #8


Re: Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/528results.jpg

Results from SlotShots 1/4 mi... with LOTS of glue!!!  I like those numbers. Car is in the 95 gram range...

Last edited by Macman (5/28/2014 10:01 pm)


Formerly of SARN
     Thread Starter
 

5/29/2014 2:51 am  #9


Re: Suggestions... not fast enough

Are you going for speed or ET?

 

5/29/2014 12:27 pm  #10


Re: Suggestions... not fast enough

I would like to have both, but personally I think et wins races... any suggestions for increasing both, or either one welcome.
Knowlege is power, & you generally can't have too much.


Formerly of SARN
     Thread Starter
 

5/30/2014 2:56 am  #11


Re: Suggestions... not fast enough

leave everything were it is ,except go up to 14Th pinion ,looks like you still have a little spin in the 60Ft time, 1 tooth more my be enough to help both the 60Ft and Mph.

 

5/30/2014 2:43 pm  #12


Re: Suggestions... not fast enough

But Dave, I started out with a 14...
 


Formerly of SARN
     Thread Starter
 

5/31/2014 3:37 am  #13


Re: Suggestions... not fast enough

changed tires ,wheelie bar braces , wheelie bar heighth , glue ,now time for small things and who knows you might been geared right the first time , find what everything likes ,not just the motor

 

6/12/2014 4:55 pm  #14


Re: Suggestions... not fast enough

6/12... rainy night, cut wheelwells out of rear of body, MUCH less glue, but still enough to bogg a ceramic PS 20...
http://i1267.photobucket.com/albums/jj558/Ben_Kernan/DRSVraptor20-612results.jpg

Last edited by Macman (6/12/2014 4:57 pm)


Formerly of SARN
     Thread Starter
 

6/19/2014 11:12 pm  #15


Re: Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/6191000results.jpg

Good night's testing @ slotCar Cave's 1000' track


Formerly of SARN
     Thread Starter
 

6/20/2014 10:50 am  #16


Re: Suggestions... not fast enough

Awesome!!!  Looks like it's coming around!!!  I was just thinking about this...  What spring/brush combo are you running? And is it shunt wired?  I picked up a TON when I stepped the spring pressure up and added shunt wire.... 

Making passes is the best way to learn what the car wants.  We don't race dynos or power supplies...

 

6/20/2014 1:14 pm  #17


Re: Suggestions... not fast enough

I haven't done spring insullation or shunts yet... Its been 20 years since I fooled with that stuff... Guess its time again.


Formerly of SARN
     Thread Starter
 

6/20/2014 6:31 pm  #18


Re: Suggestions... not fast enough

Marty wrote:

Gary Lum wrote:

Awesome!!! Looks like it's coming around!!! I was just thinking about this... What spring/brush combo are you running? And is it shunt wired? I picked up a TON when I stepped the spring pressure up and added shunt wire....

Making passes is the best way to learn what the car wants. We don't race dynos or power supplies...

Try this. Measure your spring pressure with shunts. Remove shut and reset spring pressure to previous number. Let us know much difference you note.

I don't race a dyno but it sure is a good myth buster http://cdn.boardhost.com/emoticons/wink.png

 
.007 slower and same mph within .02 mph with everything the same pressure wise less shunts.  Could have been a glue thing.  I can't control the glue downtrack during a race....

What myth is there to bust?   Raising spring pressure picked my car up a ton and my springs last longer.  You can run shunts or not, but for me, I just don't like the idea of losing a race cause of a spring failure....   I've had motors on my dyno that made great peak power but sucked on track.  Couldn't match the rpm rate with a good enough gear /glue combo.   What part of my statement was wrong?  Marty, if you thought I was taking a dig at you, I'm sorry, I was not.  Hope you're doing well.

Last edited by Gary Lum (6/20/2014 6:32 pm)

 

6/24/2014 9:33 am  #19


Re: Suggestions... not fast enough

We are cool Marty....  I'm pretty sure you and I are on the same page....   

Anyways, been doing some work with the spring pressure....  We will know for sure tomorrow....

 

6/26/2014 1:16 pm  #20


Re: Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/625-2.jpg

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/625-1.jpg

A couple of good, consistent runs at SlotShots 1/4 mile... still haven't added the shunts, that is the next step.
Whats going to be interesting is when the Styrene body for this one is finished... MUCH less aero 68 dart.. with that package this could become an .890 index car...

Last edited by Macman (6/26/2014 1:20 pm)


Formerly of SARN
     Thread Starter
 

6/26/2014 1:30 pm  #21


Re: Suggestions... not fast enough

BTW, which do you all like, braided or simple stranded shuntwire??? I picked up some of the simple braided, then looked at my old motors & saw they were all braided... I'm guessing I will have to tin the end of the stranded into a solid piece...

Last edited by Macman (6/26/2014 1:30 pm)


Formerly of SARN
     Thread Starter
 

6/27/2014 2:42 am  #22


Re: Suggestions... not fast enough

I prefer the braided. It's a little stiffer to work with, but it's also a lot more durable. The stranded shunts are easy to form into shape, but you can't take the springs off more than a couple times without really having to monkey around with them, if not just replace them altogether.


Knowledge does not equal Understanding, and the Truth is the Truth, no matter what you think of it...........
 

8/04/2014 1:36 pm  #23


Re: Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/Comingsoon.jpg

New body for this car, not quite thru, but paint is mostly finished. Styrene... thinking it may end up as an index car, possibly change the VR-20 to a Neo Big Dog.


Formerly of SARN
     Thread Starter
 

9/21/2014 1:17 pm  #24


Re: Suggestions... not fast enough

http://i1267.photobucket.com/albums/jj558/Ben_Kernan/920VR20DRS.jpg

New body all nounted, really disappointed, MUCH slower, best time on 1000' .996. Motor seems to have lost all its pep, think this one weighed out @ 115 grams with new body.


Formerly of SARN
     Thread Starter
 

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