Visit The Dirt Forum for More Information

Author Topic:   BLOWING HEI MODULES
fastrack1
Member
posted September 30, 2004 06:43 PM
I have had 2 hei modules go bad in 13 races.One was a good napa the other a DYNA MOD .NEW CAP,COIL,PLUG WIRES,.Had not had any trouble in 3 seasons like this .It has a very slight top end miss like a rev limiter starts around 62-63 but will get 65-66 before corner. Checked chassis gound no ohm problems there. Would a battery going to low voltage do this has 12.5 to 13 volts .Did straight wire still missed.


Ego Racing
Member
posted September 30, 2004 07:44 PM
The 12.5-13 volts, is that under load or after the race? A battery can be 13 volts setting there but if the car was running it can go down to 6-8 volts. If the voltage got to those numbers then the amperage load would be in the hole. This could cause problems.


fastrack1
Member
posted September 30, 2004 08:03 PM
I checked the volts at the plug going in to the dist. Battery fully charged shows 13.9-14, cranks it drops to the 12.5 to 13 but i have checked after a all night running it still had these numbers. Strange thing i tied in a wire hooked the volt meter up and when i reved it up it went crazywould not keep a steady number.


Ego Racing
Member
posted September 30, 2004 08:31 PM
You need to put the volt meter at the battery and start the car, while it is running see what the meter is reading. After a night running see what it is at while the car is running as this is the volatge of the battery under load, or you can take it to an auto parts store after a nights racing and see what the load voltage is.


iowatoolman
Member
posted September 30, 2004 09:14 PM
wouldn't an alternator be worth the headache
it don't take much power to run

drive hard or drive home

2nd2none
Member
posted October 01, 2004 01:58 AM
there are devices that fry modules when they detect traction control.

LOL couldnt resist.


Now, seriously, check your ignition and starter switch. I've seen these go bad and fry modules.

Also, how new and what type of battery are you using? I've seen where the vibrations of dirt track racing have caused the plates in wet cell batterys to become dislodged and shorting each other out causing a miss and could possibly cause a module to go bad.

[This message has been edited by 2nd2none (edited October 01, 2004).]

sleepy 1h
Member
posted October 01, 2004 03:50 AM
Boy thats one heck of a battery (13.9 to 14 volts) out of a 12 volt battery??????? The best I have ever gotten is 12.9, new, with a full charge. sleepy


rdirt
Member
posted October 01, 2004 09:43 AM
Just for note, on a Gel cell battery do not over charge it. It will shorten the life of the battery. To much voltage and you will be exchanging it for another.


fastrack1
Member
posted October 01, 2004 07:50 PM
Have more info checked the battery setting up for 3 weeks since it last raced no charging shows 13.13 at battery 12.91 at the dist did not check it running will do that later .Battery is almost 4 seasons old hi amp SEARS battery.


Ego Racing
Member
posted October 01, 2004 09:33 PM
Most 12vdc batterys will read at 13-13.5 volts on a meter. A normal batterry at full charge is 2.25 vols per cell at 6 cells that is 13.5 VDC.


iowatoolman
Member
posted October 01, 2004 11:41 PM
sorry to disagree but automotive batteries are 2.1 volts per cell for a total of 12.6 fully charged anything over is overcharge usually from the alternator that puts out 13.2 to 15.2 normal operating parameters
quote:
Originally posted by Ego Racing:
Most 12vdc batterys will read at 13-13.5 volts on a meter. A normal batterry at full charge is 2.25 vols per cell at 6 cells that is 13.5 VDC.



FirstLight7
Member
posted October 02, 2004 08:35 AM
FIRED IT UP GOT 12.9 IDLE GOES TO 12.75-12.8 AT 6200 HAS NO ALT checked at battery ---checked at dist 12.12 11.51 at 6400

[This message has been edited by fastrack1 (edited October 02, 2004).]

FlyNLoIMCA17
Member
posted October 02, 2004 10:43 PM
The grease was applied ,but i found a chart last night on 12 v batteries and it states 12.7 fully charged 12.2 50% chgd according to this at the dist i am only getting 50% voltage at idle and at 6400 11.51 I basicially dont have enough voltage .Does any one agree?

[This message has been edited by fastrack1 (edited October 03, 2004).]

Donnie Ross
Member
posted October 03, 2004 08:32 AM
check for voltage drop thru the switch and wiring the hei has a very instantanios(spelling) amp draw use at least 14ga wire with nothing else hooked to ign. switch but the dist.use a seperate switch for accessories,

[This message has been edited by Donnie Ross (edited October 03, 2004).]

fastrack1
Member
posted October 03, 2004 11:27 AM
I think i found it, somewhere its losing volts in the switch.It was a Rebco setup ,I had a back up switch tied in to existing wires I have now got the lights& starter on one switch and the dist on a another .Guess what it picked up from 11.51 to 12.44 dont know where the volt is lost but it will stay this way till we run next month. THANKS EVERYONE FOR THE INPUT.


cobb
Member
posted October 03, 2004 04:56 PM
i had a dana mod go bad last week. of course i blew up my motor last night so i guess it doesn't really matter