Tach Lag .............. Discussion
Thread Starter
TECH Fanatic
Joined: Nov 2001
Posts: 1,695
Likes: 9
From: Raleigh, NC
Tach Lag .............. Discussion Was not really sure where to put this topic because it happens more on the street but here goes.
On the way home tonight I decided to play around a little. It was very cold out so the car was pulling hard and breaking loose easily. I pulled out and rolled into the throttle and the tires went up in smoke, but then it felt like my car was hitting the rev limiter at about 5K RPM, at first I thought this was detonation <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> . so at the next couple of stops I waited to roll into it @ about 3k to make sure it would not spin and ran the car through the entire RPM range a couple of times....It was completely smoothe....no detonation <img border="0" alt="[worship]" title="" src="graemlins/gr_hail.gif" /> . So it looks like it was just Tachometer lag.
My question is: is this normal in a stock geared M6? The Tach was lagging by a good 1000 RPM when the tires were spinning <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> . I am getting 3.73s installed in the next couple of weeks, should I expect this to get worse??
Sorry so long,
TIA,
-Nick
On the way home tonight I decided to play around a little. It was very cold out so the car was pulling hard and breaking loose easily. I pulled out and rolled into the throttle and the tires went up in smoke, but then it felt like my car was hitting the rev limiter at about 5K RPM, at first I thought this was detonation <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> . so at the next couple of stops I waited to roll into it @ about 3k to make sure it would not spin and ran the car through the entire RPM range a couple of times....It was completely smoothe....no detonation <img border="0" alt="[worship]" title="" src="graemlins/gr_hail.gif" /> . So it looks like it was just Tachometer lag.
My question is: is this normal in a stock geared M6? The Tach was lagging by a good 1000 RPM when the tires were spinning <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> . I am getting 3.73s installed in the next couple of weeks, should I expect this to get worse??
Sorry so long,
TIA,
-Nick
Re: Tach Lag .............. Discussion Yep - the factory tach lag is terrible in first gear, bad in second, and allright for the most part by the time you hit third. I did the same thing the first times I got on it hard in first gear - banged the rev limiter even though the tach showed nothing close to redline.
I would highly suggest you get a shiflight of some kind - solves that problem.
I would highly suggest you get a shiflight of some kind - solves that problem.
Re: Tach Lag .............. Discussion Same here. When I hit the 6750 limiter, my tach reads 5500 <img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> That's only in first and second though, It has a little time to play catch up in third.
Re: Tach Lag .............. Discussion Gears will make it worse.
Nick I think it's time for a shift light. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Nick I think it's time for a shift light. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Trending Topics
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: Tach Lag .............. Discussion I had a big problem with that when I got my cam and 4.10's installed, noticed that RIGHT away, I decided to have a 5" Autometer Silver series tach put in w/blue shiftlight, it does the job, all you need really is a shift light, but I like to stare at the rpm's on there.... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Fanatic
Joined: Nov 2001
Posts: 1,695
Likes: 9
From: Raleigh, NC
Re: Tach Lag .............. Discussion </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jleews6:
<strong> Gears will make it worse.
Nick I think it's time for a shift light. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nah, Ill leave that to the big dogs like yall <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> .
John, did you get a chance to go over the the 1/4&1/8 mile section of LS1.com. There is a thread going about VMP.
<small>[ April 02, 2003, 08:04 AM: Message edited by: niphilli ]</small>
<strong> Gears will make it worse.
Nick I think it's time for a shift light. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nah, Ill leave that to the big dogs like yall <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> .
John, did you get a chance to go over the the 1/4&1/8 mile section of LS1.com. There is a thread going about VMP.
<small>[ April 02, 2003, 08:04 AM: Message edited by: niphilli ]</small>
TECH Addict
Joined: Jan 2002
Posts: 2,950
Likes: 0
From: Magee MS
Re: Tach Lag .............. Discussion I had/have some really bad problems with my car on nitrous like that. The first time I sprayed my car I took it out and I raced a guy and I had nitto's on and I hit the button and the car just lunged forward and the tack just stuck at like 3,500 and( I left off the kit) then it shifted and the tach flashed to like 6,400 and back down to like 4,000 and I laid back into it and it lagged again and it eventually cuaght back up.
Needless to say I haven't sprayed the car since, to even see if it still does it. I plan on finding out soon.(if it does lagg I'm gunna be in big trouble b/c the new converter and nitrous are gunna make a hella difference)
Josh S.
Needless to say I haven't sprayed the car since, to even see if it still does it. I plan on finding out soon.(if it does lagg I'm gunna be in big trouble b/c the new converter and nitrous are gunna make a hella difference)
Josh S.
