PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

rough idle and poor performance past 2nd gear

Thread Tools
 
Search this Thread
 
Old Nov 27, 2018 | 02:22 PM
  #1  
jkhall's Avatar
Thread Starter
Teching In
 
Joined: Dec 2017
Posts: 28
Likes: 0
Default rough idle and poor performance past 2nd gear

I have a 1970 RS Camaro with LS swap that is not performing as I felt it would and I am a novice with tuning, I had a college help with the tune but I am hoping I can get advise/assistance as it is underwhelming when I mash the pedal @ 50MPH. at idle the tach moves about 100rpms. I am told that from the aggressive cam. I have never run such an aggressive cam before so I usually associate moving in cam with a miss.

I am attaching my HPtuners config as I feel its something in here.

LQ4 6.0l engine

Trick Flow® GenX® 220 Cylinder Heads for GM
LS2 TFS-30610002
intake runner 220cc
exhaust runner80cc
combustion chamber volume 65cc
intake valve 2.055"
Exhaust valve diameter1.57"
Compression ratio is 10.3:1


Howards CamCam Specs
Duration Exhaust:282
Duration Intake:275
Duration at 050 Exhaust: 234
Duration at 050 Intake:228
Intake Centerline:108
Lobe Separation:112
Valve lift intake0.604
Valve Lift Exhaust: 0.609
Yella Terra lightweight 1.7 lightweight roller rockers
36LB injectors
LS6 intake
stock drive by wire throttle body
Full-length Hooker comp headers

4L60e Tranny (complete rebuild for 650hp ratio w/2300 stall)







Help



Attached Files

Last edited by jkhall; Nov 27, 2018 at 03:47 PM.
Reply
Old Nov 27, 2018 | 03:02 PM
  #2  
jkhall's Avatar
Thread Starter
Teching In
 
Joined: Dec 2017
Posts: 28
Likes: 0
Default

Here is my log file as well..
Attached Files
File Type: hpl
first log file.hpl (162.4 KB, 35 views)
Reply
Old Dec 7, 2018 | 10:06 AM
  #3  
Luke19901's Avatar
Launching!
 
Joined: Jan 2018
Posts: 283
Likes: 0
Default

zero out stall saver tables.

halve your idle overspeed correction table (multiply by 0.5) then manually copy those values into the underspeed table but make them positive numbers. meaning the overspeed and underspeed spark correction will add or subtract equal amounts of timing for any giver RPM error value.

disable and max out drivetrain abuse in engine torque management.

remove your PE delay.

use a wideband to confirm its not running too rich drowning it at WOT or too lean making no torque. that cam isn't overly large nor is the compression super high. it should be quite streetable.
Reply




All times are GMT -5. The time now is 08:22 PM.

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