Factory tach lazy? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2010_camaro · 06-06-2018, 06:57 PM

Anyine else notice the factory tach not bring able to keep up with engine speed?
I normally do test hits on gate pressure but now I have a tire that works I've been trying test hits on high boost.

My issue is that the RPM gauge will read 5500-5800rpm but I'm actually hitting my redline at 7k.
At first I thought I was having some serious issue with the car not being able to climb past 6k but according to my HP tuners I'm hitting the box every time.

JD555 · 06-06-2018, 07:11 PM

I have noticed a few hundred RPM difference between the HUD and gauge but not that much. But i am sure you are spooling up faster than I am.

CamaroFred · 06-06-2018, 07:42 PM

The tach and speedometer aren't fast enough to keep up with a stock SS in 1st but do okay in the rest of the gears.

christianchevell · 06-07-2018, 07:08 AM

Suggest a speedhut obd2 shift light may make staring at your rpms a thing of the past it will show true time rpms on the side of it and leaves no doubt when to shift being programable. No problems with my tach having delay here on either SS I have owned.

A aftermarket tach connected to the OBD2 ports you would think have like zero delay if FI makes it slow ….so you could go off of that like I said with a shift light or aftermarket tach; Anyway if its just like Fred said a fact …..?

Frankly I am usually busy just driving back to work or the store.....LOL And usually hitting gears long before my shift light ever goes off....unless I am being a bit spirited..... stock electronics may not be sensitive enough for a more responsive engine speed change to keep up? but not a common complaint heard here. Just some thoughts... Good Luck

Moto-Mojo · 06-07-2018, 07:18 PM

Seems like the HUD does a reasonable job. What say y’all that uses it? Gotta admit, unless I just let the A6 do the shifting I wuss out with the paddles at about 5K. Read about too many busted valve springs here!

06-06-2018, 06:57 PM	#1
2010_camaro Drives: 2014 Camaro SS Join Date: May 2011 Location: Florence, KY Posts: 2,238 View My Garage	Factory tach lazy? Anyine else notice the factory tach not bring able to keep up with engine speed? I normally do test hits on gate pressure but now I have a tire that works I've been trying test hits on high boost. My issue is that the RPM gauge will read 5500-5800rpm but I'm actually hitting my redline at 7k. At first I thought I was having some serious issue with the car not being able to climb past 6k but according to my HP tuners I'm hitting the box every time. __________________ MODS 6.0 forged iron block, TH400, B&M shifter, DSS axles & driveshaft, Viking / BMR suspension, Full custom fuel system with cell, Twin 76mm teriyaki tornados on 24lbs. https://www.instagram.com/whoopa_ss/

06-06-2018, 07:42 PM	#3
CamaroFred Drives: Miss Con Ception Join Date: Aug 2016 Location: Chicagoland Posts: 2,998	The tach and speedometer aren't fast enough to keep up with a stock SS in 1st but do okay in the rest of the gears. __________________ 2011 1SS/RS LS3 CGM

06-07-2018, 07:08 AM	#4
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	Suggest a speedhut obd2 shift light may make staring at your rpms a thing of the past it will show true time rpms on the side of it and leaves no doubt when to shift being programable. No problems with my tach having delay here on either SS I have owned. A aftermarket tach connected to the OBD2 ports you would think have like zero delay if FI makes it slow ….so you could go off of that like I said with a shift light or aftermarket tach; Anyway if its just like Fred said a fact …..? Frankly I am usually busy just driving back to work or the store.....LOL And usually hitting gears long before my shift light ever goes off....unless I am being a bit spirited..... stock electronics may not be sensitive enough for a more responsive engine speed change to keep up? but not a common complaint heard here. Just some thoughts... Good Luck __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

06-07-2018, 07:18 PM	#5
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 3,973	Seems like the HUD does a reasonable job. What say y’all that uses it? Gotta admit, unless I just let the A6 do the shifting I wuss out with the paddles at about 5K. Read about too many busted valve springs here! __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

06-06-2018, 07:11 PM	#2
JD555 Drives: 2014 2SS RS, 6 sp man Join Date: Feb 2016 Location: Marlton, NJ Posts: 461	I have noticed a few hundred RPM difference between the HUD and gauge but not that much. But i am sure you are spooling up faster than I am.