C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Been puzzled about this for a year now

Thread Tools
 
Search this Thread
 
Old Nov 17, 2011 | 01:50 AM
  #21  
desertmike1's Avatar
desertmike1
Melting Slicks
10 Year Member
 
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
Default

Reply
Old Nov 17, 2011 | 07:48 AM
  #22  
dclafleur's Avatar
dclafleur
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2005
Posts: 6,551
Likes: 36
From: Jenks OK
Default

Originally Posted by 383vett
When the control arm bushing bolts are tightened, the bushings are held in that position. The control arm does not freely rotate within the bushing. It can move a few degrees up and a few degrees down as the rubber twists. If the bolts are tightened when the arms are not at normal ride height, the arms will want to return to the position they were when the bolts were tighened. Hopefully this makes sense. Willie
So could it be that the bushing has torn? Although it would seem that it would make the car ride lower then..
Reply
Old Nov 17, 2011 | 08:27 AM
  #23  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by 383vett
When the control arm bushing bolts are tightened, the bushings are held in that position. The control arm does not freely rotate within the bushing. It can move a few degrees up and a few degrees down as the rubber twists. If the bolts are tightened when the arms are not at normal ride height, the arms will want to return to the position they were when the bolts were tighened. Hopefully this makes sense. Willie
I can see what your saying. Just gonna have to figure out how I can get some measurements first of the control arms now as it sits and be able to apply that measurement and come up with a corrected measurement while its in the air and the tire off. Have to think about this for a bit.

Maybe what I could do is measure to the lower ball joint from the floor... loosen my control arms...place a floor jack under the arm raise and retighten. Then see if it stays or not. Naturally doing one side at a time.

Once I attempt this is my alignment gonna be off?
Reply
Old Nov 17, 2011 | 10:31 AM
  #24  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,697
Likes: 1,666
From: moraga ca
Default

When you have the car up on jackstands, remove the wheels, loosen the bolts, put a jack under the lower A arm around the area of the outer ball joint. Jack it up as far as you can until the car starts to lift off the jackstands. Tighten the bolts up and you should be good to go. The alignment may or may not need to be tweaked. Willie
Reply
Old Nov 17, 2011 | 11:39 AM
  #25  
JrRifleCoach's Avatar
JrRifleCoach
Team Owner
20 Year Member
Veteran: Navy
St. Jude 20 Year Donor
Liked
 
Joined: Sep 2003
Posts: 20,171
Likes: 672
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Default

with 383's posts here.

One other item you should check is the front spring.
I encountered this same issue when I lowered the front end.

Loosen the mount bolts and bounce the front end. Then tighten.
This should reset the static position of the spring if it is in a bind.

Reply
Old Nov 19, 2011 | 06:41 PM
  #26  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by JrRifleCoach
with 383's posts here.

One other item you should check is the front spring.
I encountered this same issue when I lowered the front end.

Loosen the mount bolts and bounce the front end. Then tighten.
This should reset the static position of the spring if it is in a bind.

Just an update,
I did try this. Loosen up the spring, even removed the shocks so I would get a ton of bounce. Gap between top of tire and fender is still 3.5 inches.
I'm now gonna try the control arms but I don't have a socket large enough for the upper control arm.
Largest socket I've got is 1 in and the nuts are bigger. Hopefully the FSM will tell me the size.
Reply
Old Nov 19, 2011 | 07:44 PM
  #27  
ex-x-fire's Avatar
ex-x-fire
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2009
Posts: 2,227
Likes: 284
Default

When you did your engine swap, did you go to alloy heads (approx 40lbs lighter over iron), remove anything else like a/c or air pump parts?
Reply
Old Nov 19, 2011 | 07:54 PM
  #28  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by ex-x-fire
When you did your engine swap, did you go to alloy heads (approx 40lbs lighter over iron), remove anything else like a/c or air pump parts?
There should only be about a 100lb differance in weight.
Aluminum heads and the removal of the Air pump.
I'm not sure if theres a weight differance between the CFI intake and the HSR.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-1

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-2

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-3

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-4

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-5

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-6

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-7

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-8

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-9

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
Old Nov 19, 2011 | 08:09 PM
  #29  
Bredd1's Avatar
Bredd1
Instructor
 
Joined: May 2011
Posts: 213
Likes: 0
From: Miramar Florida
Default

I wonder if this is the case with my car as well. It has had an engine swap from a crossfire to an L98 with aluminum heads.
Reply
Old Nov 19, 2011 | 09:20 PM
  #30  
ex-x-fire's Avatar
ex-x-fire
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2009
Posts: 2,227
Likes: 284
Default

These composite leaf springs dont get weak & sag like coil springs, a lighter engine could cause the added ride height.
Reply
Old Nov 19, 2011 | 09:56 PM
  #31  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by ex-x-fire
These composite leaf springs dont get weak & sag like coil springs, a lighter engine could cause the added ride height.
And I agree. But you know me I need to actually see if thats the problem. So I tested the theory. Based on just going to Aluminum heads and removing the AIR components. Other than that everything is there so I think we're only talking around 100 lb differance.

So here is the measurement from the floor to the top of the inner fender


Now don't get made at me for what I'm about the do.... lets add say 130 extra pounds to the engine




And take another measurement in the same location as we started with
Based on the additional weight the ride height did not adjust

Reply
Old Nov 20, 2011 | 12:43 PM
  #32  
ex-x-fire's Avatar
ex-x-fire
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2009
Posts: 2,227
Likes: 284
Default

Thats good detective work, but the case aint closed yet.
Have you done anything to the suspension that you can think of?
Reply
Old Nov 20, 2011 | 01:29 PM
  #33  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by ex-x-fire
Thats good detective work, but the case aint closed yet.
Have you done anything to the suspension that you can think of?
Measured both the height of front and back tires
Put KYB's on last winter, but have proven that those have not lifted the front
Steering Rack has been replaced 3x this summer. All were rebuilt and came from ecklers. They all leak at the inner tie rod on the drivers side.
Replace calipers and rotors this year.
Other than that nothing has been replaced on the front suspension
Reply
Old Nov 20, 2011 | 01:39 PM
  #34  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,697
Likes: 1,666
From: moraga ca
Default

Could it be something with the rear suspension? If the left rear is lowered or right rear is jacked, you will have increased clearance on the right front.
Reply
Old Nov 20, 2011 | 07:38 PM
  #35  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by 383vett
Could it be something with the rear suspension? If the left rear is lowered or right rear is jacked, you will have increased clearance on the right front.
I was thinking about that to. 3 years ago I put a D44, and the 315's but I never noticed any differance in the ride height.
I measure today the back. Floor to top of fender is 27.50 on each side so it appears nothing has sagged. Top of tire to fender is 2.5 inches

Front is from floor to top of fender is 28.00 inches. Top of tire to top of fender has a gap of 3.5 inches

I don't know what is causing the issue..
Reply
Old Nov 20, 2011 | 07:50 PM
  #36  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,697
Likes: 1,666
From: moraga ca
Default

Originally Posted by qws
I was thinking about that to. 3 years ago I put a D44, and the 315's but I never noticed any differance in the ride height.
I measure today the back. Floor to top of fender is 27.50 on each side so it appears nothing has sagged. Top of tire to fender is 2.5 inches

Front is from floor to top of fender is 28.00 inches. Top of tire to top of fender has a gap of 3.5 inches

I don't know what is causing the issue..
Your garage is obviously warped.
Reply
Old Nov 20, 2011 | 08:04 PM
  #37  
Bredd1's Avatar
Bredd1
Instructor
 
Joined: May 2011
Posts: 213
Likes: 0
From: Miramar Florida
Default

Your measurements are almost exactly identical to my car. I've only owned the car a little over six months and the car was this way when I got it. I don't know what all was done by the previous owner. I can tell that the steering rack has been replaced.
Reply

Get notified of new replies

To Been puzzled about this for a year now

Old Nov 20, 2011 | 08:26 PM
  #38  
qws's Avatar
qws
Thread Starter
Melting Slicks
10 Year Member
 
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Default

Originally Posted by 383vett
Your garage is obviously warped.
.... thats gotta be the problem!..
Reply
Old Nov 20, 2011 | 08:52 PM
  #39  
nutz4c4's Avatar
nutz4c4
Melting Slicks
 
Joined: Nov 2005
Posts: 2,736
Likes: 0
From: WAY UPSTATE NY
Default

Originally Posted by 383vett
Your garage is obviously warped.

Originally Posted by qws
.... thats gotta be the problem!..
Oh, it's warped in there...
Reply
Old Nov 20, 2011 | 08:59 PM
  #40  
Bredd1's Avatar
Bredd1
Instructor
 
Joined: May 2011
Posts: 213
Likes: 0
From: Miramar Florida
Default

I guess my garage, driveway, parking lot at Walmart, and parking lot at the muffler shop are all warped.
Reply



All times are GMT -4. The time now is 01:38 PM.

story-0
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-1
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-2
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-3
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-4
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-5
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-6
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-7
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-8
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-9
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE