PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Check this out: Is YOUR TACH this slow?!?

Thread Tools
 
Search this Thread
 
Old Jan 28, 2010 | 01:29 PM
  #1  
IKnowtheFuture's Avatar
Thread Starter
TECH Apprentice
iTrader: (5)
 
Joined: Oct 2008
Posts: 333
Likes: 0
From: Cary, NC
Talking Check this out: Is YOUR TACH this slow?!?

Is your tach this slow? guess what my shift light is set at.

http://www.youtube.com/watch?v=cEmeCJH6dbE
Reply
Old Jan 28, 2010 | 02:09 PM
  #2  
00T/AWS6's Avatar
TECH Enthusiast
iTrader: (17)
 
Joined: Mar 2007
Posts: 575
Likes: 0
From: Alexandria, VA
Default

holy crap that tach is lazy. Mine is pretty lazy but it isn't that slow. Mine atleast comes up, it's prolly like about 700 rpm's off.
Reply
Old Jan 28, 2010 | 04:54 PM
  #3  
brianfromhawaii's Avatar
11 Second Club
iTrader: (3)
 
Joined: Oct 2007
Posts: 857
Likes: 0
From: Hawaii
Default

the tach works off the obd2 system, do you have a space ecu or any scanners hooked up or anything? stock OS on the ecu?
Reply
Old Jan 28, 2010 | 05:23 PM
  #4  
Lythropus's Avatar
TECH Resident
iTrader: (13)
 
Joined: Jan 2004
Posts: 992
Likes: 0
From: South Carolina
Default

Mine is pretty slow, say I'm running 60mph or so, throw it into second, floor it, if it breaks loose I'll bang the limiter at 8,500 before my tach even says 7,000. My shift light says it's slow by about 800rpm but that's also dependent on how fast it revs, 800rpms off in a second gear pull but it starts catching up in third and is dead on in 4th...
Reply
Old Jan 28, 2010 | 11:24 PM
  #5  
David_viny's Avatar
Launching!
15 Year Member
 
Joined: Jun 2008
Posts: 254
Likes: 0
From: Maine
Default

Wow, that is really slow lol. This is as close as I could pause it:



So whats the shift light set to anyway?

I def can tell mines slow though, it really annoys me actually. Might have to get a shift light.
Reply
Old Feb 1, 2010 | 08:09 PM
  #6  
IKnowtheFuture's Avatar
Thread Starter
TECH Apprentice
iTrader: (5)
 
Joined: Oct 2008
Posts: 333
Likes: 0
From: Cary, NC
Default

6250 rpm. lol
Reply
Old Feb 1, 2010 | 08:25 PM
  #7  
LS1Tuner_06's Avatar
TECH Apprentice
iTrader: (3)
 
Joined: Nov 2006
Posts: 386
Likes: 0
From: Bentonville,AR
Default

Mine is the exact opposite. Any one know why it would take a long time for my rpm's to drop. I'm pretty sure my other ls1 buddy's cars just drop down after they let off the accelerator. Mine seems to hang and drop really slow.

Sorry to Jack your thread. If anyone can think of anything can you please PM me.
Reply
Old Feb 1, 2010 | 09:26 PM
  #8  
LSxPwrDZ's Avatar
9 Second Club
iTrader: (4)
 
Joined: Nov 2008
Posts: 619
Likes: 14
From: Stanford, KY
Default

Originally Posted by LS1Tuner_06
Mine is the exact opposite. Any one know why it would take a long time for my rpm's to drop. I'm pretty sure my other ls1 buddy's cars just drop down after they let off the accelerator. Mine seems to hang and drop really slow.

Sorry to Jack your thread. If anyone can think of anything can you please PM me.
It's all in the tune. Usually a table called Idle Follower if you are sitting still and Idle Cracker if you are moving above 2-3mph.

I've got a 98 Trans Am and a 00 Z28 and I must say that my TA is fairly quick but my Camaro is the exact same way as above... It's noticeably worse on a 150 shot too! I think it's mostly due to what was stated above on the newer cars. The 99-up cars run on a serial bus that delivers all the gauges data via a GM Link. I know for a fact my 98 does not run off this because the tach wire on the ECU runs to the gauge... and changing the tach output resolution changes the RPM's on the 98 but doesnt on the 00.

I've not found a fix to speed it up... does somebody have one?
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo




All times are GMT -5. The time now is 06:07 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