Max input to Ram 500 Ecu ?
03-17-2002, 11:06 AM
#1
Senior Member
Thread Starter
My Feedback: (1)
Join Date: Dec 2001
Location: Apple Valley,
CA
Posts: 1,137
Likes: 0
Received 0 Likes
on
0 Posts
Max input to Ram 500 Ecu ?
Hi Everyone,
does anyone know the max. input voltage for the Ram 500 ECU ? When I charge the 1400mah Sanyo nicad for 14hrs @ 140mah-the open circuit voltage just off the charger is 9.57vdc-as soon as it is plugged in and powererd up it is 8.60vdc-that speed 300 motor that is used as the starter motor draws 25 amps on a cold start-thats alot of current-when it is starting the engine-the voltage drops to as low as 6.75vdc-I wonder if you can use a 7cell pack-the extra 1.35volt would help-BUT can the ECU take it ?-the full charge voltage could be 11vdc no load........all measurements were taken with a Fluke DVOM
Jackjet
does anyone know the max. input voltage for the Ram 500 ECU ? When I charge the 1400mah Sanyo nicad for 14hrs @ 140mah-the open circuit voltage just off the charger is 9.57vdc-as soon as it is plugged in and powererd up it is 8.60vdc-that speed 300 motor that is used as the starter motor draws 25 amps on a cold start-thats alot of current-when it is starting the engine-the voltage drops to as low as 6.75vdc-I wonder if you can use a 7cell pack-the extra 1.35volt would help-BUT can the ECU take it ?-the full charge voltage could be 11vdc no load........all measurements were taken with a Fluke DVOM
Jackjet
03-17-2002, 10:00 PM
#2
Max input to Ram 500 Ecu ?
Jack
Absolutely DO NOT use an 8.4 volt pack will blow components. A couple of tricks - spin up the engine with the electric starter then as it slows hit the start run button. That will take the current draw down some. We are now using 1250 SCR packs that are designed to tolerate a high current draw. Talk to Carlos at RAM with regards to your particular engine and needs. Should you require more info please do not hesitate to contact me through my website as well. Shop phone is also listed.
Regards
Dean Wichmann
RAM Marketing / Sales
Canada
Absolutely DO NOT use an 8.4 volt pack will blow components. A couple of tricks - spin up the engine with the electric starter then as it slows hit the start run button. That will take the current draw down some. We are now using 1250 SCR packs that are designed to tolerate a high current draw. Talk to Carlos at RAM with regards to your particular engine and needs. Should you require more info please do not hesitate to contact me through my website as well. Shop phone is also listed.
Regards
Dean Wichmann
RAM Marketing / Sales
Canada
03-18-2002, 01:15 AM
#3
Senior Member
Thread Starter
My Feedback: (1)
Join Date: Dec 2001
Location: Apple Valley,
CA
Posts: 1,137
Likes: 0
Received 0 Likes
on
0 Posts
Ram 500 starting
[QUOTE]Originally posted by Helijet
Jack
Absolutely DO NOT use an 8.4 volt pack will blow components. A couple of tricks - spin up the engine with the electric starter then as it slows hit the start run button. That will take the current draw down some. We are now using 1250 SCR packs that are designed to tolerate a high current draw. Talk to Carlos at RAM with regards to your particular engine and needs. Should you require more info please do not hesitate to contact me through my website as well. Shop phone is also listed.
Regards
Dean Wichmann
RAM Marketing / Sales
Canada [/QUOT
Dean,
thanks for the info-it just that the voltage of the cells just off the charger is over 9vdc and the Ecu seems to handle it ok-but that extra 1.35vdc may push it over the edge- so what I will do is parallel another 6 cell 5000mah pack for starting-just like jump starting a car....what do you think ?
Jackjet
Jack
Absolutely DO NOT use an 8.4 volt pack will blow components. A couple of tricks - spin up the engine with the electric starter then as it slows hit the start run button. That will take the current draw down some. We are now using 1250 SCR packs that are designed to tolerate a high current draw. Talk to Carlos at RAM with regards to your particular engine and needs. Should you require more info please do not hesitate to contact me through my website as well. Shop phone is also listed.
Regards
Dean Wichmann
RAM Marketing / Sales
Canada [/QUOT
Dean,
thanks for the info-it just that the voltage of the cells just off the charger is over 9vdc and the Ecu seems to handle it ok-but that extra 1.35vdc may push it over the edge- so what I will do is parallel another 6 cell 5000mah pack for starting-just like jump starting a car....what do you think ?
Jackjet
03-18-2002, 05:58 AM
#5
Senior Member
My Feedback: (5)
Join Date: Jan 2002
Location: Lakeville , MN,
Posts: 348
Likes: 0
Received 0 Likes
on
0 Posts
Re: Ram 500 starting
[- so what I will do is parallel another 6 cell 5000mah pack for starting-just like jump starting a car....what do you think ?
Jackjet [/B][/QUOTE]
This is what I do. I just happened to have some 6 cell car batteries. I hook them in parallel with the onboard battery during starting, then unplug the aux batterry and go fly. Works just fine.
Jackjet [/B][/QUOTE]
This is what I do. I just happened to have some 6 cell car batteries. I hook them in parallel with the onboard battery during starting, then unplug the aux batterry and go fly. Works just fine.
03-18-2002, 06:03 AM
#6
Senior Member
Thread Starter
My Feedback: (1)
Join Date: Dec 2001
Location: Apple Valley,
CA
Posts: 1,137
Likes: 0
Received 0 Likes
on
0 Posts
Re: Re: Ram 500 starting
Originally posted by Brian B
[- so what I will do is parallel another 6 cell 5000mah pack for starting-just like jump starting a car....what do you think ?
Jackjet
[- so what I will do is parallel another 6 cell 5000mah pack for starting-just like jump starting a car....what do you think ?
Jackjet
Brian,
Thats just what I was thinking-and you know the engine starts much better when it is at least 70deg. or more outside.
Jackjet
03-18-2002, 07:04 AM
#7
My Feedback: (4)
External start batteries
Jackjet,
One of the guys that flies at our club George Rada has done this with his RAM100R. He has an external battery that drives the starter motor of the engine and the onboard battery drives the solenoids and pump. He is a member here so if he reads this he might be willing to share his setup. I have seen it work it is a very superb system.
Patrick.
One of the guys that flies at our club George Rada has done this with his RAM100R. He has an external battery that drives the starter motor of the engine and the onboard battery drives the solenoids and pump. He is a member here so if he reads this he might be willing to share his setup. I have seen it work it is a very superb system.
Patrick.
03-18-2002, 12:10 PM
#8
Senior Member
My Feedback: (5)
Join Date: Jan 2002
Location: Lakeville , MN,
Posts: 348
Likes: 0
Received 0 Likes
on
0 Posts
Re: External start batteries
Originally posted by sirrom
Jackjet,He has an external battery that drives the starter motor of the engine and the onboard battery drives the solenoids and pump
Patrick.
Jackjet,He has an external battery that drives the starter motor of the engine and the onboard battery drives the solenoids and pump
Patrick.
I like it better than hooking up an aux battery in parallel during startup. I will have to look at my setup to see how I can do this.
03-18-2002, 12:49 PM
#9
Member
My Feedback: (2)
Join Date: Dec 2001
Location: Tampa, Florida
Posts: 95
Likes: 0
Received 0 Likes
on
0 Posts
Max input to Ram 500 Ecu ?
Hi Guys,
NOOOOOOO. Don't do it.
The RAM 750/750+/1000 uses a different starter motor than the 500 ( ask me how I know). I use an 8 cell 2400 mah pack connected via an automotive relay to the turbine/ECU. This allows the turbine starter motor to spin using the external battery. This external battery is higher in voltage, ie 8 cells vs. the 6 cell onboard pack. The high voltage will spin the turbine more quickly and makes for much more reliable and faster startups. The plus is that your on board ECU battery does not need to be charged until the end of the day.
The RAM 500 uses a smaller motor that will not tolerate the higher voltage of an 8 cell pack. Maybe a 7 cell pack, but I won't be conducting another $200 experiment!!
George R.
NOOOOOOO. Don't do it.
The RAM 750/750+/1000 uses a different starter motor than the 500 ( ask me how I know). I use an 8 cell 2400 mah pack connected via an automotive relay to the turbine/ECU. This allows the turbine starter motor to spin using the external battery. This external battery is higher in voltage, ie 8 cells vs. the 6 cell onboard pack. The high voltage will spin the turbine more quickly and makes for much more reliable and faster startups. The plus is that your on board ECU battery does not need to be charged until the end of the day.
The RAM 500 uses a smaller motor that will not tolerate the higher voltage of an 8 cell pack. Maybe a 7 cell pack, but I won't be conducting another $200 experiment!!
George R.
03-18-2002, 02:43 PM
#10
My Feedback: (4)
external battery
George,
Just wondering if a battery of the same size (7.2v) could be used externally so that you would not be putting all the load on the internal battery. Just increase the capacity of the external battery from 1250 mah to 2000 mah? Reading the other posts RAM recommends sticking with their batteries because the ECU could not handle the higher capacity but what about the starter motor?
Patrick.
Just wondering if a battery of the same size (7.2v) could be used externally so that you would not be putting all the load on the internal battery. Just increase the capacity of the external battery from 1250 mah to 2000 mah? Reading the other posts RAM recommends sticking with their batteries because the ECU could not handle the higher capacity but what about the starter motor?
Patrick.
03-18-2002, 04:03 PM
#11
Max input to Ram 500 Ecu ?
Guys
I have spoken with both Albert and Bob Price on the subject. If you wish you can use a higher amp battery particularly the SCR cells work very well. We have had good success with 1800 - 2000 mah SCR packs.
We have been supplying 1250mah 7.2 volt SCR packs ( red ) to replace the older ( blue ) 1400 AAE . Under no circumstanes use a higher voltage pack than 7.2 as we cannot guarantee ECU damage will not occur ( read at your own risk ).
Should you have any further questions please contact me through
www.helijet.ca
Dean Wichmann
RAM Marketing/Sales
Canada
I have spoken with both Albert and Bob Price on the subject. If you wish you can use a higher amp battery particularly the SCR cells work very well. We have had good success with 1800 - 2000 mah SCR packs.
We have been supplying 1250mah 7.2 volt SCR packs ( red ) to replace the older ( blue ) 1400 AAE . Under no circumstanes use a higher voltage pack than 7.2 as we cannot guarantee ECU damage will not occur ( read at your own risk ).
Should you have any further questions please contact me through
www.helijet.ca
Dean Wichmann
RAM Marketing/Sales
Canada
