PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Cold Start Tuning

Thread Tools
 
Search this Thread
 
Old Mar 25, 2017 | 09:31 AM
  #1  
Siciliano15's Avatar
Thread Starter
11 Second Club
15 Year Member
Photogenic
iTrader: (7)
 
Joined: Mar 2009
Posts: 368
Likes: 2
From: NY/CT
Default Cold Start Tuning

So long story short every external mod I do whether it was the ATI 10% non-ac underdrive pulley, the removal of the AC system and all of the associated pulleys, the Vigilante 3600 9.5" converter they all have something in common. They either reduce rotating weight on the front of the engine or back of the engine making the engine do less work but not anything that affects actual engine tune or fuel ratios.

The thing I noticed is that after each thing I did, when I start the car up, it starts more violently. Especially when doing a cold start its most apparent. Hot starts arent bad they are more normal. Now after all of these mods, it starts up really loud to the point it scares the hell outta people standing nearby.

I dont want to change exhausts but is there a way to somehow adjust the cold start of the car so its not getting so much initial power? Is it something with the timing or something else? I know with carb'd engines more timing makes them start up stronger but I am not sure if its the same here or if there is something else that I can change. I have hp tuners on my laptop.
Reply
Old Mar 25, 2017 | 11:14 AM
  #2  
Darth_V8r's Avatar
Moderator
10 Year Member
Liked
Loved
Community Favorite
iTrader: (4)
 
Joined: Jul 2014
Posts: 10,451
Likes: 1,873
From: My own internal universe
Default

In the engine idle section there is a startup air adder and a friction adder. Reduce the cold areas of those tables it'll reduce the startup flare
Reply
Old Mar 27, 2017 | 11:05 PM
  #3  
Siciliano15's Avatar
Thread Starter
11 Second Club
15 Year Member
Photogenic
iTrader: (7)
 
Joined: Mar 2009
Posts: 368
Likes: 2
From: NY/CT
Default

oh ok ill give that a try. my airflow table is all zereoed out but ill try adjusting the friction table a little lower
Reply
Old Mar 28, 2017 | 07:34 AM
  #4  
Darth_V8r's Avatar
Moderator
10 Year Member
Liked
Loved
Community Favorite
iTrader: (4)
 
Joined: Jul 2014
Posts: 10,451
Likes: 1,873
From: My own internal universe
Default

if that still doesn't help, then possibly check the cranking fuel VE and reduce it a bit to reduce the start up fuel. Don't go too far or it won't start.
Reply




All times are GMT -5. The time now is 04:32 PM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE