Voltage problem after GTM SC install

zuperman 370 · 05-20-2013, 04:09 AM

I just recently installed at GTM stage 2 SC on my 7AT 370z, it seems that i am having problems with the voltage now. The safe or regular voltage that the 370z should be operating at is 14v, 13.9 or 13.8 if it dips, when I turn on my car the voltage is at 14.5 or even 14 so its normal, then it dips down all the way to 13.4 and 13.2v and stays like that. I check all the earths, but all seems good, battery is brand new as well. Please guys any kind of help on what you might think the problem would be or things i should check for when a problem like this happens, could it be a weak alternator or a lose wire some where, and help or advice i can get for you guys would be much appreciated

Mkai0 · 05-20-2013, 08:30 AM

Do you have one of these yet?
https://www.gtmotorsports.com/produc...cat=331&page=1

My car did this same thing before the voltage stabilizer. Everyone once in awhile my voltage still drops when running my A/C full blast, but not nearly as often.

m3chhawk · 05-20-2013, 12:15 PM

Wow. $70 for ~20 feet of 10 AWG, a relay, and a fuse holder. GTM sure does love their stuff...

Liquid_G · 05-20-2013, 02:01 PM

The fuel pump is really drawing that much? Even at idle?

Baer383 · 05-20-2013, 08:47 PM

Yeah like this one

Autoplicity.com

SouthArk370Z · 05-20-2013, 09:22 PM

I don't see how using bigger wire to the fuel pump will help system voltage. It will help fuel pump voltage/current but wouldn't that allow the pump to put more drain on the system and make the situation worse? What am I missing here?

m3chhawk · 05-21-2013, 09:39 AM

Ditto on increasing the wire size will only increase the draw.

Out of curiosity, do you have a new battery because the old one was bad? Have you checked all of the alternator connections?

05-20-2013, 04:09 AM	#1 (permalink)
zuperman 370 Track Member Join Date: Dec 2009 Location: BAHRAIN Posts: 944 Drives: 370z 2010 at blue Rep Power: 16	Voltage problem after GTM SC install I just recently installed at GTM stage 2 SC on my 7AT 370z, it seems that i am having problems with the voltage now. The safe or regular voltage that the 370z should be operating at is 14v, 13.9 or 13.8 if it dips, when I turn on my car the voltage is at 14.5 or even 14 so its normal, then it dips down all the way to 13.4 and 13.2v and stays like that. I check all the earths, but all seems good, battery is brand new as well. Please guys any kind of help on what you might think the problem would be or things i should check for when a problem like this happens, could it be a weak alternator or a lose wire some where, and help or advice i can get for you guys would be much appreciated

05-20-2013, 08:30 AM	#2 (permalink)
Mkai0 Base Member Join Date: Dec 2010 Location: Somewhere in Texas Posts: 209 Drives: 2008 G35 Sedan Rep Power: 14	Do you have one of these yet? https://www.gtmotorsports.com/produc...cat=331&page=1 My car did this same thing before the voltage stabilizer. Everyone once in awhile my voltage still drops when running my A/C full blast, but not nearly as often. __________________ Eibach, Tanabe, Blitz, Vertini, GTM stage 1.5 SC, Aquamist, Invidia, Alto built 5AT, Edge Racing, Racelogic, GTM driveshaft, 440 whp in 101F TX heat..

05-20-2013, 12:15 PM	#3 (permalink)
m3chhawk Track Member Join Date: Sep 2012 Location: Kansas City Posts: 878 Drives: '11 370Z SPT 6MT BLK Rep Power: 25	Wow. $70 for ~20 feet of 10 AWG, a relay, and a fuse holder. GTM sure does love their stuff... GaleForce and MyKindaGuise like this. __________________ F.I. CF CBE \| Avant Garde M310 \| BC BR's \| ONEighty \| Status \| EvoR \| Stillen \| Whiteline \| B&M \| Bespoke Details Boosted Performance \| Precision Turbo \| Tial \| HKS \| Innovate Motorsports \| Bosch \| Treadstone \| Walbro \| UpRev \| Depo

05-20-2013, 02:01 PM	#4 (permalink)
Liquid_G A True Z Fanatic Join Date: Aug 2009 Location: Chicago Burbs Posts: 1,439 Drives: 09 370z Supercharged Rep Power: 44	The fuel pump is really drawing that much? Even at idle? __________________

05-20-2013, 08:47 PM	#5 (permalink)
Baer383 A True Z Fanatic Join Date: Aug 2010 Location: Lawrenceville,Ga Posts: 4,293 Drives: My foot up your azz Rep Power: 30	Yeah like this one Autoplicity.com m3chhawk likes this. __________________ 2013 ZL1 754 rwhp 747 rwtq

05-20-2013, 09:22 PM	#6 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	I don't see how using bigger wire to the fuel pump will help system voltage. It will help fuel pump voltage/current but wouldn't that allow the pump to put more drain on the system and make the situation worse? What am I missing here? m3chhawk likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

05-21-2013, 09:39 AM	#7 (permalink)
m3chhawk Track Member Join Date: Sep 2012 Location: Kansas City Posts: 878 Drives: '11 370Z SPT 6MT BLK Rep Power: 25	Ditto on increasing the wire size will only increase the draw. Out of curiosity, do you have a new battery because the old one was bad? Have you checked all of the alternator connections? __________________ F.I. CF CBE \| Avant Garde M310 \| BC BR's \| ONEighty \| Status \| EvoR \| Stillen \| Whiteline \| B&M \| Bespoke Details Boosted Performance \| Precision Turbo \| Tial \| HKS \| Innovate Motorsports \| Bosch \| Treadstone \| Walbro \| UpRev \| Depo

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