Speed Pro Voltage Poll
- Thread starter Jeff Rand
- Start date
Jeff, this has been brougt up before in other posts. I have found that once the voltage on the Fast system gets below 13.8 the system has a hard time running right. What I think I see is the injectors are not all getting enough voltage to stay open as long as needed and the system gets eratic.
This is also where I started to use a battery charger in between runs to keep the voltage up in the battery. I found that if I got to the track with a fully charged battery, that each pass the voltage on the Fast system went a little lower. And after about 4 passes I was getting into the 13.8 range and bad things would happen.
Check your wiring harness and other things. I had a pod installed on my alt and set it at 14 all the time.
Take Care
This is also where I started to use a battery charger in between runs to keep the voltage up in the battery. I found that if I got to the track with a fully charged battery, that each pass the voltage on the Fast system went a little lower. And after about 4 passes I was getting into the 13.8 range and bad things would happen.
Check your wiring harness and other things. I had a pod installed on my alt and set it at 14 all the time.
Take Care
Neal, I have been all through the electrical system and have upgraded my alternator to 200 amp. I did find that by adding an additional wire from my fuse block to the switched +12 volt wire on the Speed Pro, I could get the volts to 13.8 at idle and 13 volts at WOT.
Jeff
Jeff
Hey Jeff!! How's it going???
You're suffering the same dilemma I've had with my stock ECM/Electricals for several years. System runs at 13.8 at idle and all other situations all day long.
But make a WOT blast down the track and voltage likes to stay down around 12.9-13.1
Never have tracked it down, and nothing seems to suffer as a result.
I went through this last year... voltage would drop WAY down under WOT... i tried running big power and ground wires straight to the ECU and no dice... i sent my ECU for a firmware upgrade and that helped a little... but what finally kicked the problem was PTE's voltage regulator... it plugs right into the alternator and has a pot on it to adjust the voltage to whatever level you want... my 9 year old factory alternator puts out a constant 13.8V under all kinds of loads... i see at most +/- .2 V now... call Harry!
Jeff, I did add a Caspers volt booster to the mix and that did not solve the problem. I think the voltage the Speed Pro displays is from the switched +12 volt feed. I am going to try and find a feed that will only supply the FAST unit without any interferance from other accessories.
Jeff
Craig Smith
That was easy!
- Joined
- May 25, 2001
I've raced a bracket car (not my own) with a 12 volt battery and NO alternator. Car was deadly consistent maintaining 12.0 to 12.2 volts all the way down the track. Just threw a 40 amp charger at it between rounds. It's not the way that I would do it on my own car, nor would I recommend it this way, but it will do it.
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