Serpent 720
03-29-2009, 06:46 AM
#4670
Hello all,
I set my 720'09 with the DJ's starting setup and I visited the local track for some practice. The grip was extremely low, because the track was very dusty. However, the car was consistent and predictable. I suffered from on power oversteer, which could be easily controlled if you compromised with a little lower lap times.
Could I have you feedback/answers to the following:
I did not install the extra 30grams in the front bumper and I used the plastic battery holder instead of the brass one mentioned by DJ in the setup. Do you consider those as big changes and how they will affect the car handling?
The proposed tire diameters 60.5/59 are intended for a 30min final? What is the lower limit for the tires diameter at the end of the final and what is the lower limit for their difference rear/front?
I used a Picco EVO3 engine and I had my clutch with the default fly weights, 31mm fly wheel, yellow shoe, 0.6mm gap, 0.1 end play and 1.5 spring preload. When the grip is there I use 0.7 gap and 1.6-1.7 spring preload. I don't have a complain with this set up but would you recommend something different?
Hypothetically, if I had to race with this low grip condition and I had to improve the on power oversteer on the corner exit, what should be my first change?
I had my dual rate set to 75%. Is it in the expected range for this setup?
Does the front solid axle use cause any king of premature wear on certain parts like front cvds or belts or anything else?
Thanks in advance
Dimitris
I set my 720'09 with the DJ's starting setup and I visited the local track for some practice. The grip was extremely low, because the track was very dusty. However, the car was consistent and predictable. I suffered from on power oversteer, which could be easily controlled if you compromised with a little lower lap times.
Could I have you feedback/answers to the following:
I did not install the extra 30grams in the front bumper and I used the plastic battery holder instead of the brass one mentioned by DJ in the setup. Do you consider those as big changes and how they will affect the car handling?
The proposed tire diameters 60.5/59 are intended for a 30min final? What is the lower limit for the tires diameter at the end of the final and what is the lower limit for their difference rear/front?
I used a Picco EVO3 engine and I had my clutch with the default fly weights, 31mm fly wheel, yellow shoe, 0.6mm gap, 0.1 end play and 1.5 spring preload. When the grip is there I use 0.7 gap and 1.6-1.7 spring preload. I don't have a complain with this set up but would you recommend something different?
Hypothetically, if I had to race with this low grip condition and I had to improve the on power oversteer on the corner exit, what should be my first change?
I had my dual rate set to 75%. Is it in the expected range for this setup?
Does the front solid axle use cause any king of premature wear on certain parts like front cvds or belts or anything else?
Thanks in advance
Dimitris
You should use the brass battery tray, and install the brass filler plate.
03-29-2009, 09:02 AM
#4671
The dusty track is causing the oversterr on power. You can try to go lower in the rear diff oil. Maybe 10,000, also you could lower the rear lower pins, add more rear toe and add more rear camber. Just some ideas... Also with that motor I would run a .4 gap and with a dusty track gear it about 18/61 or 17/59 on first. This will help with the on power issues also.
Good luck,
DJ Apolaro
Good luck,
DJ Apolaro
03-29-2009, 11:37 AM
#4674
For Floyd Bennett Field, you can start with 61/56 spur and 17/22 pinion, if your running a Nova based motor.
03-29-2009, 12:58 PM
#4675
The dusty track is causing the oversterr on power. You can try to go lower in the rear diff oil. Maybe 10,000, also you could lower the rear lower pins, add more rear toe and add more rear camber. Just some ideas... Also with that motor I would run a .4 gap and with a dusty track gear it about 18/61 or 17/59 on first. This will help with the on power issues also.
Good luck,
DJ Apolaro
Good luck,
DJ Apolaro
DJ, could you please comment on the:
1) do you consider a must for this setup the brass battery tray and the 30grams in the bumper? if yes, why?
2) tire size, do you intend to enter the 30 mins final with 60.5/59? what is the min acceptable diameter and difference rear/front at the end?
3) is the DR 75% in the acceptable range with this setup?
4) does the front solid cause premature wear to certain parts like front cvds or anything else?
//BR
Dimitris
03-29-2009, 01:02 PM
#4676
Regarding the brass filler plate, my experience is that makes the steering smooth but the car becomes very very slow in the direction changes. Please correct me if I am wrong and give me some good hints on why I should use it and when.
Thanks once more
Dimitris
03-29-2009, 01:11 PM
#4677
I have to say that I liked the car with the front solid. I found it better (limited testing) than the 80.000K front and 20.000 or 30.000 rear.
Front springs new blue, rear springs old yellow, just because I found them closer to the recommended new orange, which I do not have at the moment.
I am not so sure if the tire size is only for qualifying, because according to my calculations for the specific track conditions, I could finish the final somewhere close to 57.5/56 and the car still has good ride height.
//BR
Dimitris
03-29-2009, 01:18 PM
#4679
Thank you guys for your feedback.
DJ, could you please comment on the:
1) do you consider a must for this setup the brass battery tray and the 30grams in the bumper? if yes, why?
2) tire size, do you intend to enter the 30 mins final with 60.5/59? what is the min acceptable diameter and difference rear/front at the end?
3) is the DR 75% in the acceptable range with this setup?
4) does the front solid cause premature wear to certain parts like front cvds or anything else?
//BR
Dimitris
DJ, could you please comment on the:
1) do you consider a must for this setup the brass battery tray and the 30grams in the bumper? if yes, why?
2) tire size, do you intend to enter the 30 mins final with 60.5/59? what is the min acceptable diameter and difference rear/front at the end?
3) is the DR 75% in the acceptable range with this setup?
4) does the front solid cause premature wear to certain parts like front cvds or anything else?
//BR
Dimitris
2) Tire size depends completely in your track. For instance, here we start with new rear tires and front tires split of 2.5-3mm. And even so, we almost end up on the rim
3) The dual rate is a good setting, I'd just suggest you keep it at 75-80 and adjust your car accordingly. If by anychance you are about to start the main, and you feel your car has alot of oversteer or understeer, you can easily fix this with dual rate.
4) I would say yes, remember its restricting the complete movement. But, if you add a drop of lubricant before going out in the front CVDs joints and in the solid axle's outdrives, youll see that there wont be any noticeble wear.