52LikesTeam Losi JRXS Type-R
03-08-2009, 04:23 AM
#9287
Thanks for all of the input. I will move the ESC to the side once I get some longer motor wires. I'm new to the sport and have many questions about setup. I have only raced in two events. One was the Florida State series (17.5 class at Kississme Raceway and the other was a heads up 13.5 shootout at Superior Hobbies in Casselberry. Both events I raced a Corally RDX PHI, LRP SPX ESC, Novak 17.5/13.5 that I bought at Snowbirds. A good friend of mine owns the local hobby shop convinced me to partner up with him and start racing a product that he sells. So we chose the JRX-S and ordered six kits. Three for him and three for me. The plan is to race the 17.5 and the 13.5 class with a backup car each. Heres my next question. When I was walking around Snowbirds I saw people with these scales weighing their cars on all four tires. So I built one. Pics Below. Here is what I found. The car with body weighted 3lbs. 5.25oz. total. The Left Front 404 grams, Right Front 315 grams, Left Rear 342 grams, and Right Rear 448 grams. Racing outdoors on asphalt what numbers should I be looking for? Perfect balance or the 52/48 percent? Seams to be way off. I have a Corally Tweaker and tweaked it. It was way off. I had to loosen the Lipo tray to do so. I will move the ESC before I make any changes. Thanks again for the help.
I have tried the scale thing and it dosen't seem to work out consistently. Its better to guage your tweak against properly setup droop. This produces a straight chassis everytime. To do your f/r balance stick something under the front and rear of your chassis under the axles and guage it there with either one or two sets of scales. The reading will be close enough. The chassis comes with holes in the bottom for l/r balancing so I suggest you use them too.
Tried running a low rear roll center for the first time and noticed that it took away a lot of rear grip to the point I lost all confidence driving the car. Anyone else found this? I have also noticed that?
Most rubber/asphalt setups I have read have high front low rear roll center. Is that to find more steering?
Most rubber/asphalt setups I have read have high front low rear roll center. Is that to find more steering?
03-08-2009, 04:32 AM
#9288
Thanks for all of the input. I will move the ESC to the side once I get some longer motor wires. I'm new to the sport and have many questions about setup. I have only raced in two events. One was the Florida State series (17.5 class at Kississme Raceway and the other was a heads up 13.5 shootout at Superior Hobbies in Casselberry. Both events I raced a Corally RDX PHI, LRP SPX ESC, Novak 17.5/13.5 that I bought at Snowbirds. A good friend of mine owns the local hobby shop convinced me to partner up with him and start racing a product that he sells. So we chose the JRX-S and ordered six kits. Three for him and three for me. The plan is to race the 17.5 and the 13.5 class with a backup car each. Heres my next question. When I was walking around Snowbirds I saw people with these scales weighing their cars on all four tires. So I built one. Pics Below. Here is what I found. The car with body weighted 3lbs. 5.25oz. total. The Left Front 404 grams, Right Front 315 grams, Left Rear 342 grams, and Right Rear 448 grams. Racing outdoors on asphalt what numbers should I be looking for? Perfect balance or the 52/48 percent? Seams to be way off. I have a Corally Tweaker and tweaked it. It was way off. I had to loosen the Lipo tray to do so. I will move the ESC before I make any changes. Thanks again for the help.
03-08-2009, 07:10 AM
#9289
Tried running a low rear roll center for the first time and noticed that it took away a lot of rear grip to the point I lost all confidence driving the car. Anyone else found this? I have also noticed that?
Most rubber/asphalt setups I have read have high front low rear roll center. Is that to find more steering?
Most rubber/asphalt setups I have read have high front low rear roll center. Is that to find more steering?
03-08-2009, 07:26 AM
#9290
Everything else was the same. I know changing the hight of the lower pins is one of the biggest changes you can make but this was huge. After the first run I went back to high rear roll center and it drove as I am used to. I really have been chasing rear grip the whole time I've had this car.
Does your car seem balanced with high front low rear? Are you after more steering or rear traction?
Will try low all round next time. Seems as though Dragonfire had his car workng like that today.
03-08-2009, 09:11 AM
#9291
Everything else was the same. I know changing the hight of the lower pins is one of the biggest changes you can make but this was huge. After the first run I went back to high rear roll center and it drove as I am used to. I really have been chasing rear grip the whole time I've had this car.
Does your car seem balanced with high front low rear? Are you after more steering or rear traction?
Will try low all round next time. Seems as though Dragonfire had his car workng like that today.
Does your car seem balanced with high front low rear? Are you after more steering or rear traction?
Will try low all round next time. Seems as though Dragonfire had his car workng like that today.
When i first got the car i too was chasing rear traction. In comparision to other brands, the JRXS-R has a bit more steering than usual. I drove a T2 009 on the same track with the same tyres with a very similar setup (high front low rear) and it had gobs of rear traction. I think it has a lot to do with the flex of the chassis. The R has a very stiff chassis setup, and it can be a pain to dial it into a low grip track.
This is my 2 cents... others might have a differing opinion...
03-08-2009, 03:02 PM
#9292
rear grip
I run 17.5lb springs front and 12.5lb rears with diffs front and rear. The car was very balanced (for me). I tried low all around, but the car was very unresponsive compared with the current setup. Going to high front low rears has given me more stability.
When i first got the car i too was chasing rear traction. In comparision to other brands, the JRXS-R has a bit more steering than usual. I drove a T2 009 on the same track with the same tyres with a very similar setup (high front low rear) and it had gobs of rear traction. I think it has a lot to do with the flex of the chassis. The R has a very stiff chassis setup, and it can be a pain to dial it into a low grip track.
This is my 2 cents... others might have a differing opinion...
When i first got the car i too was chasing rear traction. In comparision to other brands, the JRXS-R has a bit more steering than usual. I drove a T2 009 on the same track with the same tyres with a very similar setup (high front low rear) and it had gobs of rear traction. I think it has a lot to do with the flex of the chassis. The R has a very stiff chassis setup, and it can be a pain to dial it into a low grip track.
This is my 2 cents... others might have a differing opinion...
I think it the weight down the center does not allow for the same amount of weight transfer as other cars so spring pressure is needed to make the car "grip"
I have used a higher roll center in the rear to get more grip at times.
03-08-2009, 08:55 PM
#9298
No but in general cases by lowering roll centre you will get more grip everywhere. and by raising them you will get less grip more stability but increase response high speed steering and corner speed. usually for carpet or foam you raise front and drop rear for rubber on asphalt you raise rear and lower front or run the same!! when you changed did you check droop again and check ride height and all the usual ? if not then by lowering rear you will have no droop and ride height will be too high!
03-08-2009, 09:21 PM
#9299
No but in general cases by lowering roll centre you will get more grip everywhere. and by raising them you will get less grip more stability but increase response high speed steering and corner speed. usually for carpet or foam you raise front and drop rear for rubber on asphalt you raise rear and lower front or run the same!! when you changed did you check droop again and check ride height and all the usual ? if not then by lowering rear you will have no droop and ride height will be too high!
03-08-2009, 09:30 PM
#9300
Interesting in that all the rubber setups I have run have been high front, low rear for rubber. Sometimes high front and medium rear. Medium rear would be low roll center with washers under it. Current rubber setup is high front with low rear and .03 anti squat. This is also a spool setup I am running currently on carpet.
