57LikesThe Speed Passion Thread
04-16-2012, 07:29 AM
#9286
I get it now. Well unfortunately the only way you can do that is if you have a buddy at the track that already has the stuff and he or she hooks you up and flashes your speedo for you to the blinky software or you decided to buy the Citrix stock club race speedo.
http://www.speedpassion.net/us/produ...?p=12280&c=ESC
http://www.speedpassion.net/us/produ...?p=12280&c=ESC
04-16-2012, 07:50 AM
#9287
I ran the 2.1 Prostock on Sunday in 13.5 TC and have a couple of questions.
I was geared at 7.48 FDR and the motor came off 72C max. The ambient temps were cold all day (around 10C) so this may have been a little warm.
My main question is for the attached setup and track which is approx 40m x 30m do I need to gear lower 7.73 or 7.99? Acceleration could have been better and my lap times did get better when I geared down to 7.48 from 7.2.
I wonder if it is down to the turbo kicking in as I accelerate hard out of some of the corners at full throttle that is bogging down the acceleration.
Has anyone tried setting timing to 64 and just setting a very high boost timing acceleration value? I was wondering if it would be better to rely on the RPM of the motor to set the timing rather than holding full throttle? If I used say 700RPM/Deg that would mean 64 timing would be applied at 49800 RPM rather than when I hold full throttle for a period of time?
I was geared at 7.48 FDR and the motor came off 72C max. The ambient temps were cold all day (around 10C) so this may have been a little warm.
My main question is for the attached setup and track which is approx 40m x 30m do I need to gear lower 7.73 or 7.99? Acceleration could have been better and my lap times did get better when I geared down to 7.48 from 7.2.
I wonder if it is down to the turbo kicking in as I accelerate hard out of some of the corners at full throttle that is bogging down the acceleration.
Has anyone tried setting timing to 64 and just setting a very high boost timing acceleration value? I was wondering if it would be better to rely on the RPM of the motor to set the timing rather than holding full throttle? If I used say 700RPM/Deg that would mean 64 timing would be applied at 49800 RPM rather than when I hold full throttle for a period of time?
Use the natural torque of the motor to get you out of the corner then let the boost/turbo give you the top end on the straights.
I was in the same boat as you in the past. Assumed that, since the "boosted" software made the motor rev high, I would need to gear low to compensate. But had the same "dead" feeling on corner exit as you waited for the boost to kick in. Tried all sorts of boost settings but got nowhere.
Then I realised that gearing at 7.5:1 was wasting all the 13.5's natural torque at the bottom end. I'm at 6:1 now with an SP v3 13.5 and motor temps are not a problem so far, possibly running cooler than before.
04-16-2012, 08:10 AM
#9289
Gear up.
Use the natural torque of the motor to get you out of the corner then let the boost/turbo give you the top end on the straights.
I was in the same boat as you in the past. Assumed that, since the "boosted" software made the motor rev high, I would need to gear low to compensate. But had the same "dead" feeling on corner exit as you waited for the boost to kick in. Tried all sorts of boost settings but got nowhere.
Then I realised that gearing at 7.5:1 was wasting all the 13.5's natural torque at the bottom end. I'm at 6:1 now with an SP v3 13.5 and motor temps are not a problem so far, possibly running cooler than before.
Use the natural torque of the motor to get you out of the corner then let the boost/turbo give you the top end on the straights.
I was in the same boat as you in the past. Assumed that, since the "boosted" software made the motor rev high, I would need to gear low to compensate. But had the same "dead" feeling on corner exit as you waited for the boost to kick in. Tried all sorts of boost settings but got nowhere.
Then I realised that gearing at 7.5:1 was wasting all the 13.5's natural torque at the bottom end. I'm at 6:1 now with an SP v3 13.5 and motor temps are not a problem so far, possibly running cooler than before.
I've always worried about gearing higher as the turbo kicks in at lower revs when going full throttle out of some corners. That will just dump loads of timing on a low reving motor.
That's why I'm thinking of not using the Turbo and tuning the boost RPM to suit the track and only apply timing when the motor is reving higher.
The SP ESC has a maximum Turbo delay of 0.8 seconds. On some corners I can be on full throttle coming out of a corner for well over this. Won't turbo just always be bogging the motor down?
04-16-2012, 08:20 AM
#9290
Interesting. What speed controller/boost settings are you running?
I've always worried about gearing higher as the turbo kicks in at lower revs when going full throttle out of some corners. That will just dump loads of timing on a low reving motor.
That's why I'm thinking of not using the Turbo and tuning the boost RPM to suit the track and only apply timing when the motor is reving higher.
The SP ESC has a maximum Turbo delay of 0.8 seconds. On some corners I can be on full throttle coming out of a corner for well over this. Won't turbo just always be bogging the motor down?
I've always worried about gearing higher as the turbo kicks in at lower revs when going full throttle out of some corners. That will just dump loads of timing on a low reving motor.
That's why I'm thinking of not using the Turbo and tuning the boost RPM to suit the track and only apply timing when the motor is reving higher.
The SP ESC has a maximum Turbo delay of 0.8 seconds. On some corners I can be on full throttle coming out of a corner for well over this. Won't turbo just always be bogging the motor down?
I understand your concerns about the dumping too much timing on the motor etc. but in my experience an "all boost" setup seems to dump the timing on the motor much faster than a split between boost and turbo. With the latest softwares, the transfer from boost to turbo is actually quite smooth with the default settings.
Try a bigger pinion - it will probably feel better and better each tooth you put on. Tweak the software later - the software will do nothing to improve the performance off the line or out of slow corners - it's all in the motor and gearing at that point.
04-16-2012, 08:33 AM
#9291
I'm using the HW software in my ESC now, basically on the default settings of the latest version (I've only changed the brakes). I think it is virtually identical to the latest SP software.
I understand your concerns about the dumping too much timing on the motor etc. but in my experience an "all boost" setup seems to dump the timing on the motor much faster than a split between boost and turbo. With the latest softwares, the transfer from boost to turbo is actually quite smooth with the default settings.
Try a bigger pinion - it will probably feel better and better each tooth you put on. Tweak the software later - the software will do nothing to improve the performance off the line or out of slow corners - it's all in the motor and gearing at that point.
I understand your concerns about the dumping too much timing on the motor etc. but in my experience an "all boost" setup seems to dump the timing on the motor much faster than a split between boost and turbo. With the latest softwares, the transfer from boost to turbo is actually quite smooth with the default settings.
Try a bigger pinion - it will probably feel better and better each tooth you put on. Tweak the software later - the software will do nothing to improve the performance off the line or out of slow corners - it's all in the motor and gearing at that point.
Or is it like you say the natural torque of the motor can be utilised with higher gearing. It just seems strange that if top speed is great and I'm lacking punch out of corners I need to gear up.
04-16-2012, 08:39 AM
#9292
i bought my Hobbywing box for about 10 euros on Ebay !!!! i am sure this will not break the bank
04-16-2012, 09:45 AM
#9293
I've always worried about gearing higher as the turbo kicks in at lower revs when going full throttle out of some corners. That will just dump loads of timing on a low reving motor.
That's why I'm thinking of not using the Turbo and tuning the boost RPM to suit the track and only apply timing when the motor is reving higher.
The SP ESC has a maximum Turbo delay of 0.8 seconds. On some corners I can be on full throttle coming out of a corner for well over this. Won't turbo just always be bogging the motor down?
That's why I'm thinking of not using the Turbo and tuning the boost RPM to suit the track and only apply timing when the motor is reving higher.
The SP ESC has a maximum Turbo delay of 0.8 seconds. On some corners I can be on full throttle coming out of a corner for well over this. Won't turbo just always be bogging the motor down?
Try to think of the timing boost as your mid-range power and the turbo as your top end. 0.1 to 0.3 turbo delay is perfect for most tracks. Unless the track is a really small track (like 25m straight) then you would always want to run some turbo and not only timing boost.
I really appreciate your comments, I'm not sure I've ever got my head completely around this. If I'm lacking acceleration out of corners won't a higher gear be worse?
Or is it like you say the natural torque of the motor can be utilised with higher gearing. It just seems strange that if top speed is great and I'm lacking punch out of corners I need to gear up.
Or is it like you say the natural torque of the motor can be utilised with higher gearing. It just seems strange that if top speed is great and I'm lacking punch out of corners I need to gear up.
04-16-2012, 10:16 AM
#9294
The Reventon Pro won't be out for a while, and the GT Pro is an awesome speedo, so I'd go with the GT Pro for now.
Brushless motors have a specific efficiency range they like to operate at. If you gear too high or too low, everything can suffer. It sounds like you are geared too far trying to chase the acceleration and everything is suffering at this point (motor is hot, no acceleration).
Try to think of the timing boost as your mid-range power and the turbo as your top end. 0.1 to 0.3 turbo delay is perfect for most tracks. Unless the track is a really small track (like 25m straight) then you would always want to run some turbo and not only timing boost.
Refer to what I said about the efficiency range of the motor above. I think you will see that the motor is faster all over, including acceleration, and will probably also run cooler when you gear up again.
Brushless motors have a specific efficiency range they like to operate at. If you gear too high or too low, everything can suffer. It sounds like you are geared too far trying to chase the acceleration and everything is suffering at this point (motor is hot, no acceleration).
Try to think of the timing boost as your mid-range power and the turbo as your top end. 0.1 to 0.3 turbo delay is perfect for most tracks. Unless the track is a really small track (like 25m straight) then you would always want to run some turbo and not only timing boost.
Refer to what I said about the efficiency range of the motor above. I think you will see that the motor is faster all over, including acceleration, and will probably also run cooler when you gear up again.
04-16-2012, 12:19 PM
#9298
http://www.speedpassion.net/us/escsetup.asp
04-16-2012, 06:27 PM
#9299
