LT1-LT4 Modifications 1993-97 Gen II Small Block V8

speedometer question

Thread Tools
 
Search this Thread
 
Old Aug 28, 2009 | 05:22 PM
  #1  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default speedometer question

i finally took my car for a test drive now that its done... well more issues.... car wont spin the tires, the cat glows bright red, and the underside of the car is smoking... finally the main question...

mid 4th gear it only says im running 50 mph... that cant be right... can it?
Reply
Old Aug 28, 2009 | 05:27 PM
  #2  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by 97badass
i finally took my car for a test drive now that its done... well more issues.... car wont spin the tires, the cat glows bright red, and the underside of the car is smoking... finally the main question...

mid 4th gear it only says im running 50 mph... that cant be right... can it?
Cut the cat off and see if your acceleration improves.

Don't know what I'm at in 4th, but in 6th at 2000rpm I'm right around 90mph.
Your speedo does sound like it's really off. I think I can hit 45mph before redline in 1st.
Maybe someone swapped in a 2.73 rear end, lol.
Reply
Old Aug 28, 2009 | 05:30 PM
  #3  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

hmmm this is at about 4000 rpms and WOT i should be moving right along at that speed... shouldnt i? the cat issue might be due to the sparkplug wire that got ripped off somehow... and they were brand new taylor wires too. time for msd wires i guess
Reply
Old Aug 28, 2009 | 05:31 PM
  #4  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

the cat is coming off in a couple days anyways to be replaced with the cutout
Reply
Old Aug 28, 2009 | 05:31 PM
  #5  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by 97badass
hmmm this is at about 4000 rpms and WOT i should be moving right along at that speed... shouldnt i? the cat issue might be due to the sparkplug wire that got ripped off somehow... and they were brand new taylor wires too. time for msd wires i guess
4th gear at 4000rpm WOT should be well over 100 mph...
Reply
Old Aug 28, 2009 | 05:32 PM
  #6  
djjab57's Avatar
TECH Addict
15 Year Member
iTrader: (17)
 
Joined: Jul 2007
Posts: 2,496
Likes: 0
From: Texas
Default

A glowing cat means it is clogged up
Reply
Old Aug 28, 2009 | 05:34 PM
  #7  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by djjab57
A glowing cat means it is clogged up
Well if you are misfiring horribly (like a partially detached rotor ) and have alot of fuel hitting the manifolds, it can make your manifolds and cat glow orange. You'd be backfiring like crazy though.
Reply
Old Aug 28, 2009 | 05:58 PM
  #8  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

issue solved put factory plug wire back on in place of the taylor that got pulled out no more glowing cat sideways in first but wont spin from a 1st gear roll... but thats probably from bad gas its been sitting for 2 years and finally just now running and driving. either way it has more torque than my cobalt does horsepower plus torque lol.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Verdad Gallardo
story-1

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

 Pouria Savadkouei
story-2

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

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

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

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Aug 28, 2009 | 06:06 PM
  #9  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by 97badass
issue solved put factory plug wire back on in place of the taylor that got pulled out no more glowing cat sideways in first but wont spin from a 1st gear roll... but thats probably from bad gas its been sitting for 2 years and finally just now running and driving. either way it has more torque than my cobalt does horsepower plus torque lol.

Doh...Why the heck didn't you drain the tank and refil it with fresh gas?
I would stop running it and drain the tank if I were you.
What I did was disconnect both fuel lines from the rail and I jumped the fuel pmp prime wire with a 12v jumper wire and drained the tank. Then put in some fresh premium gas.
Reply
Old Aug 28, 2009 | 06:15 PM
  #10  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

i never thought about that one slp.... can you help me locate the how to on the hood release mod, the wire tuck, and the fuel line relocate? and anything else i can do to clean the engine bay?
Reply
Old Aug 28, 2009 | 06:17 PM
  #11  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

also on the speedometer reading wrong it shouldnt be off that bad because i switched to a 93 transmission would it?
Reply
Old Aug 28, 2009 | 06:23 PM
  #12  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by 97badass
also on the speedometer reading wrong it shouldnt be off that bad because i switched to a 93 transmission would it?
The gears in a M29 transmission (if in fact it is a M29, only available in '93) are very different from the gears in the later '94-'97 T56. It would be liking having 4.10 gears with a regular T56. That's why your speedo is off...
Reply
Old Aug 28, 2009 | 06:25 PM
  #13  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

ok thanks. i will keep messing with it and hope i figure it out. im hoping it is just because the car sat so long.
Reply
Old Aug 28, 2009 | 06:28 PM
  #14  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by 97badass
ok thanks. i will keep messing with it and hope i figure it out. im hoping it is just because the car sat so long.
Wait, I'm might be wrong...
The VSS sensor is located in the rear of the trans, so even though you have new trans gears, it should still read how fast the trans is moving and your rear end gears haven't changes so I don't see how your speedo could be off. Unless the '93 and '97 VSS's are not compatible for some reason...
Reply
Old Aug 28, 2009 | 06:45 PM
  #15  
97badass's Avatar
Thread Starter
TECH Fanatic
iTrader: (8)
 
Joined: Sep 2007
Posts: 1,823
Likes: 0
From: Hillsboro Kansas
Default

i can try to swap the 95 speed sensor with the 93? and see if that changes it any. either way 4th gear topped out is NOT 60 MPH! i have the infamous driveshaft vibration that used to only occur over 100 mph. something isnt working properly

so im going to swap the speed sensors and check out the cluster and get a tune. i know it needs a tune my security light, abs light, service engine soon light, and my low coolant light are all on. i have the egr and air deleted cai , 1le elbow, about to have the cutout instead of a cat also a 160 t stat.
Reply




All times are GMT -5. The time now is 02:58 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