Drag Racing Tech
Sponsored by:
Sponsored by:

Will an LS1 run without an alternator?

Thread Tools
 
Search this Thread
 
Old Jun 25, 2008 | 09:31 PM
  #1  
WS6HUMMER's Avatar
Thread Starter
10 Second Club
iTrader: (19)
 
Joined: Feb 2004
Posts: 2,542
Likes: 2
From: Alexandria La.
Default Will an LS1 run without an alternator?

Tried searching and cant find anything. I dont plan on running my car that way all the time but I had to take it off to do my truck manifold turbo setup which is still in the early stages. I tried cranking it after charging the battery all day and it will turn over, I smell gas but it wont start.

Right now I have the 4 guage alt wire taped up with electrical tape and the small wire just unplugged and no belt on the motor. I also just installed new low impedance injectors,flashed my VCM to a 3bar map OS with HP tuners, & a harlan 2 step. Thought maybe the 2 step could be bad so I unplugged it and bypassed it and it still wont run. Thought I may have unplugged the crank sensor when I swapped the K member so I checked it but its plugged up.

Now I'm thinking the alternator may have to be at least plugged up and grounded for it to run, tried plugging it up but I didnt have anyrhing to ground the alternator chassis with. Anyway just wanted to see If I was anywhere close. Maybe it could be that I have a 1 bar map sensor on a 3bar operating system?.............Idont know.
Reply
Old Jun 26, 2008 | 09:32 AM
  #2  
SPEEDYws6's Avatar
TECH Fanatic
iTrader: (9)
 
Joined: May 2005
Posts: 1,085
Likes: 0
From: Longview, TX
Default

The alt will not prevent it from cranking. My bet would be to look at the tune. Did you scale your IFR table for the new injectors?
Reply
Old Jun 26, 2008 | 10:12 AM
  #3  
WS6HUMMER's Avatar
Thread Starter
10 Second Club
iTrader: (19)
 
Joined: Feb 2004
Posts: 2,542
Likes: 2
From: Alexandria La.
Default

Originally Posted by SPEEDYws6
The alt will not prevent it from cranking. My bet would be to look at the tune. Did you scale your IFR table for the new injectors?
Thanks. Yes I did scale the new injectors using the excel spreadsheet. Here's what I entered for the flow rate.

Flow 8.30873 8.37073 8.43274 8.43274 8.49474 8.55675 8.61875 8.68076 8.74277 8.74277 8.80477 8.86678 8.92878 8.92878 8.99079 9.05279 9.11480

Honestly I think its way rich because the first time you turn it over it pops once but after that it wont pop again until you wait overnight and try again. The whole time it smells pretty strong of raw gas. I am lost.
Reply
Old Jun 26, 2008 | 03:57 PM
  #4  
VIPRETR2's Avatar
10 Second Club
20 Year Member
iTrader: (63)
 
Joined: Aug 2004
Posts: 757
Likes: 0
Default

Are you running the low impedance injectors with a converter box? That's the first thing that jumped out at me, the stock PCM will not drive low impedance injectors. Just a thought.

Larry
Reply
Old Jun 26, 2008 | 04:06 PM
  #5  
WS6HUMMER's Avatar
Thread Starter
10 Second Club
iTrader: (19)
 
Joined: Feb 2004
Posts: 2,542
Likes: 2
From: Alexandria La.
Default

Originally Posted by VIPRETR2
Are you running the low impedance injectors with a converter box? That's the first thing that jumped out at me, the stock PCM will not drive low impedance injectors. Just a thought.

Larry
Yeah I'm running an Acceleronics Versafueler, I had the injectors scaled wrong. HPTuners lists the definition of the flow rate table in g/sec and then over to the right it says the min and max's were in lb/hr. From reading the definition I assumed the table was in g/sec and pasted those values from my excel spread sheet to the table. Basicly the car thought it had 8# injectors.

Here's a pic of the tabel & definition, HPT said it wasnt a typo but that the g/sec text should be taken out of the definition.

Reply




All times are GMT -5. The time now is 07:11 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE