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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Adventures in data loggingGo | New | Find | Notify | Tools | Reply | |
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DRR Pro |
OK so you have the 1 wire alt with a 4ga cable that runs directly to the batt, no cutoff inline? I know it's not much difference but I guess your battery is getting lower throughout the day and that's the increased amperage from 1st to last run. You're on methanol aren't you, so you're not running the fan much even between rounds. I put a charger on between rounds while running the fan and water pump and I run a 1 wire alt. I charge to stop the discharge of the battery causing the load on the alt. Also feel it increases battery life. | |||
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DRR S/Pro |
It is a 3 wire alternator with sense wire hooked to my main power distribution point. I dont have a cutoff. Alternator is wired directly to battery. My understanding is that you can fry your alternator disconnecting it when it's under load. Currently the sensor is on the the alternator wire. I am going to move it to the main power wire. Curious to see if I get any different readings. I always though that the alternator carried all the load. But for the battery to discharge, that would indicate they are sharing the load. I guess that makes sense, as two batterys hooked in parallel share the load. I also think part of the problem is the car doesn't run long enough to keep the battery top off. I have never had any issues with a dead battery, so I think the amount I'd charging is small. It's definitely not enough to a difference in et. I do put the battery on a battery tender during the week to ensure it is topped off. Bill Simpkins 74 Nova SBC 406 3240 pounds Speierracing heads 60 1.27 (10/16) 1/8 6.03@111 (10/16) Best 9.87@131 on the rev limitor 1 Feb 2013 nova quarterpanelview wheelie FTI Converter www.speierracingheads.com | |||
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| DRR S/Pro |
It just occured to me that I leave my o2 sensor on all the time. That is probably where the discharge is coming from... Bill Simpkins 74 Nova SBC 406 3240 pounds Speierracing heads 60 1.27 (10/16) 1/8 6.03@111 (10/16) Best 9.87@131 on the rev limitor 1 Feb 2013 nova quarterpanelview wheelie FTI Converter www.speierracingheads.com | |||
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DRR Pro |
I never shut off the batteries when I'm at a race. I have a master cutoff mounted on the steering wheel. I also run a three wire alternator. It's a 12 something Delco. It's 100 amp and puts out 14.8 volts at idle. It needs the throttles winged to be sure it charges. Like you the RacePak is on all the time. I charge between runs, too. A run isn't enough to keep it charged given all the equipment we now run. I don't think those O2s drain enough to kill the battery between runs. nomad Bruce Guertin Easily distracted by bright shiny objects. Wife says I'm a new adventure every day. Call Automotive Performance Engines for all your complete engine building, dyno service needs 863-967-8781 | |||
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| DRR S/Pro |
Definitely dont think it's enough to kill the batteries between runs, just trying to under why the alternator was working harder the last run. I am going to charge it when I can between runs. I know in the past when I have had cells go bad in the batteries, it would mess with et, curious to see what the amp meter shows. Bill Simpkins 74 Nova SBC 406 3240 pounds Speierracing heads 60 1.27 (10/16) 1/8 6.03@111 (10/16) Best 9.87@131 on the rev limitor 1 Feb 2013 nova quarterpanelview wheelie FTI Converter www.speierracingheads.com | |||
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| DRR Pro |
You should check to see just how much is being drawn when the car is parked. | |||
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| DRR S/Pro |
Good call. That will be easy to do. Bill Simpkins 74 Nova SBC 406 3240 pounds Speierracing heads 60 1.27 (10/16) 1/8 6.03@111 (10/16) Best 9.87@131 on the rev limitor 1 Feb 2013 nova quarterpanelview wheelie FTI Converter www.speierracingheads.com | |||
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| DRR Pro |
One thing I've seen on cars with PG's and a spring loaded type solenoid the solenoid stays hot when the car's power is on. Just the way some wire it and I would want to wire it differently if it were mine. I have a 1 wire alt. and the only time I had any problems was when the alternator itself became a draw on the battery. | |||
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DRR Trophy |
Well since my last post here I put a new alternator( 1 wire, 100 amp.) and changed the pulleys from 4" to 5" on the crank and 2.75" to 2.375" to get the desired 2 to 1 ratio. It ran worse, running 9.70's when it should be going 9.40's, missing all the way. so after 1 pass I decided to disconnect the alternator and see what happens. Low and behold it runs 9.40 with no miss. At the time thinking it's either the alt.(new) or the charge wire(10 ga.) on the car since I bought it (18 years). So I'm going with 6ga. charge wire and while looking at the routing I forgot I put one of those moroso alt. disconnect relays on there(to shut power off when the master cut-off is off). Now wondering, since the alt. wire goes through it can it cause problems? | |||
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| DRR S/Pro |
Fire the car up, turn everything on and do a voltage drop test. Set the voltmeter to volts, put one lead on the alternator terminal, and one on the battery and tell me what it reads. Also did you charge the battery? How much voltage does it show at the battery at idle? Bill Simpkins 74 Nova SBC 406 3240 pounds Speierracing heads 60 1.27 (10/16) 1/8 6.03@111 (10/16) Best 9.87@131 on the rev limitor 1 Feb 2013 nova quarterpanelview wheelie FTI Converter www.speierracingheads.com | |||
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| DRR Trophy |
Thanks banjo, will do those tests after I change the wire. Reason I asked about the alt. shut-down is because different routing and terminals. btw do run one of those shut-down relays? | |||
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| DRR S/Pro |
Be curious to see a before and after if you can. I do not run a shutoff, it's a homerun shot from the alternator to the battery. Bill Simpkins 74 Nova SBC 406 3240 pounds Speierracing heads 60 1.27 (10/16) 1/8 6.03@111 (10/16) Best 9.87@131 on the rev limitor 1 Feb 2013 nova quarterpanelview wheelie FTI Converter www.speierracingheads.com | |||
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DRR Elite |
I have a spare Edelbrock Quikdata Advanced Box for sale cheap. A friend has a wiring harness and it’s also available. One of the original and best data collectors ever made. Message me if you want it 2005 2000lb 4 link dragster home brew 582 BBC Dart 355 1.058 2.98 4.629@149 6.094 7.310@185 | |||
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| DRR Trophy |
1 wire alternators and other configurations that are "hot wired" to the battery or main power supply will draw voltage at all times in order to keep the alternator "turned on". In my case, i had my 1 wire alternator hooked to the battery side of the master kill switch so that the car would shut off when the master power switch was turned off. The only problem with this is the draw that the alternator always places on the battery. Always leads to a dead battery if you leave the car in the trailer for a few weeks without charging. My solution was to run the 1 wire alternator through a continuous duty solenoid that's triggered by a switch on the switch panel. This way the alternator is totally disconnected from the battery and the activation wire is no longer hot and drawing electricity from the battery. I also think this kills 1 wire alternators as its never ever "turned off" unless you disconnect the wire from the alternator to the battery which i never did because its just too much trouble. Moroso makes some pretty cool master disconnect switches that would eliminate the need for the solenoid i used but it was a little easier for me to install the solenoid than swap out the switch. | |||
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| DRR S/Pro |
Question. On a one wire system, when it’s fired up and has output will taking away the hot wire take the load off or does it stay energized until it stops? Raceless in California! | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Adventures in data logging
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