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

New owner - what mods to do first..

Thread Tools
 
Search this Thread
 
Old Sep 24, 2008 | 12:02 PM
  #41  
lt4obsesses's Avatar
lt4obsesses
Le Mans Master
15 Year Member
 
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Default

Drive it for a bit, see what you like about it and where it doesn't meet your satisfaction.

Research from there. Perhaps join your local Corvette club (or two). Great resource for parts and shops. Go to shows and cruises and find out was has worked and hasn't worked for others.
Reply
Old Sep 24, 2008 | 12:06 PM
  #42  
vader86's Avatar
vader86
Team Owner
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 62,153
Likes: 1,731
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Default

Originally Posted by formul89

But, more CFM is more CFM.
Only if the engine can use the extra CFM. I've seen more than one LT1 owner here lose ET because of doing this mod, so I dont recommend doing it.
Reply
Old Sep 24, 2008 | 12:35 PM
  #43  
MK 82's Avatar
MK 82
Melting Slicks
 
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Default

Originally Posted by vader86
Only if the engine can use the extra CFM. I've seen more than one LT1 owner here lose ET because of doing this mod, so I dont recommend doing it.
I have already tried explaining that to him. Good luck!
Reply
Old Sep 24, 2008 | 12:45 PM
  #44  
formul89's Avatar
formul89
Le Mans Master
10 Year Member
 
Joined: Feb 2003
Posts: 9,087
Likes: 0
From: Chicago IL
Default

Originally Posted by MK 82
I have already tried explaining that to him. Good luck!
Reply
Old Sep 24, 2008 | 02:35 PM
  #45  
mhack's Avatar
mhack
Thread Starter
Instructor
 
Joined: Sep 2008
Posts: 116
Likes: 0
From: Tampa FL
Default

Originally Posted by MK 82
I have already tried explaining that to him. Good luck!
Not to interrupt you guys But I looked on my mufflers and ..
there are none
Looks like PO removed them, what I have are some pretty large pipes with a little bulge in place where mufflers are, look like like really slim cats - some kind of resonance chamber I guess..

I guess I already have muffler eliminators

I wonder what else he did? Would be nice to have LT4 383 under the hood

BTW Am I supposed to be able to chirp/spin tires with stock LT1 in 1st (no powerbrake)?
Sometimes I chirp going in to second..
Reply
Old Sep 24, 2008 | 02:44 PM
  #46  
BADDUCK's Avatar
BADDUCK
Le Mans Master
 
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Default

Good grief!
Reply
Old Sep 24, 2008 | 03:01 PM
  #47  
formul89's Avatar
formul89
Le Mans Master
10 Year Member
 
Joined: Feb 2003
Posts: 9,087
Likes: 0
From: Chicago IL
Default

Originally Posted by mhack
Not to interrupt you guys But I looked on my mufflers and ..
there are none
Looks like PO removed them, what I have are some pretty large pipes with a little bulge in place where mufflers are, look like like really slim cats - some kind of resonance chamber I guess..

I guess I already have muffler eliminators
Take a pic and post it. They might be resonators.
Reply
Old Sep 24, 2008 | 03:02 PM
  #48  
mhack's Avatar
mhack
Thread Starter
Instructor
 
Joined: Sep 2008
Posts: 116
Likes: 0
From: Tampa FL
Default

Originally Posted by BADDUCK
Good grief!
What
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Sep 24, 2008 | 03:46 PM
  #49  
rickneworleansla's Avatar
rickneworleansla
Le Mans Master
15 Year Member
 
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
Default

Originally Posted by crazy4c4
Go with either a gear change or an edge converter. I am looking at these and the guy guarantees .5 sec faster in the 1/4 or your money back.
I would get that in writting.

Originally Posted by neat
Nitrous.


Best mod for the $$$. Keep the car feeling and driving like stock 24/7 except when you flip the switch.

Originally Posted by mhack
So 2600 stall should be plenty?
I'd go with a good converter with a 2800 stall. Yank, Edge, Vigilante, etc..

Originally Posted by formul89
3.07 is way better than the cruiser 2.59 gear!

I suggest this: the stock converter is a total dog. Replace the converter with a good one, like a Vigilante or similar. See how you like that. If it still seems like not enough, then do the rear gear.


Hold off on a gear swap. The 3.07 is not that bad. I would at least go with a 2800 stall if bothering with the converter swap. I'm now looking at heads and cam and I wish I would have gone even higher on the stall. My 95 auto with 9.5in Vigilante 2800 stall and 3.07 still feels like it has the stock converter until you put it to the floor. Unlike a gear swap, there was no noticeable change in gas mileage either. I would use a tranny cooler, even with the stock converter to lengthen the life of the trans. They are cheap enough. When changing gears or converter a stickier tire will be needed to see an improvement. That of course opens up the potential for breaking stuff easier on harder launches. IMO

Last edited by rickneworleansla; Sep 24, 2008 at 03:48 PM.
Reply
Old Sep 25, 2008 | 12:12 AM
  #50  
Ed Ramberger's Avatar
Ed Ramberger
Drifting
15 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2008
Posts: 1,695
Likes: 490
From: Denver, NC
Default

Originally Posted by formul89

But, more CFM is more CFM.
Ahh young grasshopper - someday you will grasp the pebble. However, you may want to research many of the electronic throttle control vehicles in the world.

They actually restrict the airflow at low rpm's to build MORE power by keeping the velocity up. So, more cfm is more cfm, but is it helpful or hurtful?

The most common misconception in the motorcycle and bike world is bigger ports, exhaust etc is always better. I have seen many a vehicle suffer from too much cfm. The key is that the combination must work together - the components must compliment the air-pump that we call a motor.
Reply
Old Sep 25, 2008 | 07:09 AM
  #51  
larry00's Avatar
larry00
Race Director
15 Year Member
 
Joined: Aug 2006
Posts: 18,346
Likes: 1
From: D / FW
Default

Your Corvette is nice and if you drive it a lot then just drive it.
If you want more start with K & N and and then Full length Headers w/bungs welded in for your Oxygen sensors and Air Pump fittings. Also make sure you get Headers with thick flanges [ thicker the better ] you won't have leaks.
A good three inch exhaust with high flow cats and a Dr X pipe [ real important it will reduce noise inside the car] and if you want to further reduce noise put on resonators and good Mufflers.
My 383 hot rod Vette is as quieter than my stock vette because of the exhaust Mods listed above.
Just figure out your goal and do mods progressing towards that goal.
Don't spend money on mods only to come back and change them again.
I have 450 HP LT 4 in my 95 with a radical cam , 1.6 rockers , 1,000 CFM Holley , 42 lb injectors , ported heads , 3200 stall , built 4L60 E , Dana 44 w/373 gear and I drive it on the Hwy at 70 getting 13 MPG.
I have the Accel Generation 7 Computer but haven't really got to do much laptop tuning yet but being able to tune it for road use and track and save it in your laptop for loading at the track is a big plus when you do a lot of mods .
I think I can get that Mileage up by another 5 w/more tuning.
The big injectors are for the boost thats coming.
I haven't put the procharger on yet but its coming.
The D1 fits under hood with no mods.
I also have the 315 TA Drag Radials on American Torque Thrust wheels and with enough backspace very little sticks out using the 17 x 10.5 wheels.
I went with the stock fronts even though the car sees occasional road track use on a local 1.3 mile course.
Yes it has ride control and adjustable traction relocators.
It may be a Hot Rod but its still a sports car too.

Last edited by larry00; Sep 25, 2008 at 07:11 AM.
Reply
Old Sep 25, 2008 | 08:44 AM
  #52  
mhack's Avatar
mhack
Thread Starter
Instructor
 
Joined: Sep 2008
Posts: 116
Likes: 0
From: Tampa FL
Default

Originally Posted by larry00
Your Corvette is nice and if you drive it a lot then just drive it.
If you want more start with K & N and and then Full length Headers w/bungs welded in for your Oxygen sensors and Air Pump fittings. Also make sure you get Headers with thick flanges [ thicker the better ] you won't have leaks.
A good three inch exhaust with high flow cats and a Dr X pipe [ real important it will reduce noise inside the car] and if you want to further reduce noise put on resonators and good Mufflers.
My 383 hot rod Vette is as quieter than my stock vette because of the exhaust Mods listed above.
Just figure out your goal and do mods progressing towards that goal.
Don't spend money on mods only to come back and change them again.
I have 450 HP LT 4 in my 95 with a radical cam , 1.6 rockers , 1,000 CFM Holley , 42 lb injectors , ported heads , 3200 stall , built 4L60 E , Dana 44 w/373 gear and I drive it on the Hwy at 70 getting 13 MPG.
I have the Accel Generation 7 Computer but haven't really got to do much laptop tuning yet but being able to tune it for road use and track and save it in your laptop for loading at the track is a big plus when you do a lot of mods .
I think I can get that Mileage up by another 5 w/more tuning.
The big injectors are for the boost thats coming.
I haven't put the procharger on yet but its coming.
The D1 fits under hood with no mods.
I also have the 315 TA Drag Radials on American Torque Thrust wheels and with enough backspace very little sticks out using the 17 x 10.5 wheels.
I went with the stock fronts even though the car sees occasional road track use on a local 1.3 mile course.
Yes it has ride control and adjustable traction relocators.
It may be a Hot Rod but its still a sports car too.
Thats kind of what I'm trying to build. Thank you for the info!
Reply
Old Sep 25, 2008 | 09:09 AM
  #53  
formul89's Avatar
formul89
Le Mans Master
10 Year Member
 
Joined: Feb 2003
Posts: 9,087
Likes: 0
From: Chicago IL
Default

Originally Posted by Ed Ramberger
Ahh young grasshopper - someday you will grasp the pebble. However, you may want to research many of the electronic throttle control vehicles in the world.

They actually restrict the airflow at low rpm's to build MORE power by keeping the velocity up. So, more cfm is more cfm, but is it helpful or hurtful?

The most common misconception in the motorcycle and bike world is bigger ports, exhaust etc is always better. I have seen many a vehicle suffer from too much cfm. The key is that the combination must work together - the components must compliment the air-pump that we call a motor.
After playing with an L98 motor for 11 years, I am well aware of velocity and the bigger is not always better problem.

Removing a restriction on the intake is never a bad idea. You may want to remove your K&N filter or cold air intakes then, because they flow more air (ya know, CFM) also.

So, take the screen out. It take two seconds and will flow a little more air.

Reply
Old Sep 25, 2008 | 10:40 AM
  #54  
rickneworleansla's Avatar
rickneworleansla
Le Mans Master
15 Year Member
 
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
Default

Originally Posted by larry00
Just figure out your goal and do mods progressing towards that goal.
Don't spend money on mods only to come back and change them again.


Don't waste money on things twice. Also visit the camaro forums for a different point of view. If you are building it for hp and don't care about sound I'd just remove the stock restrictions and skip on the over priced corsa exhaust and put it toward something that will add power.

A laptop and datalogging/tunning software would be a good first buy also. I use datamaster TTS, TunerCat, PCMFORLESS tune, with a Moates.net cable on my 95.
Reply
Old Sep 25, 2008 | 10:47 AM
  #55  
mhack's Avatar
mhack
Thread Starter
Instructor
 
Joined: Sep 2008
Posts: 116
Likes: 0
From: Tampa FL
Default

Originally Posted by rickreeves1


Don't waste money on things twice. Also visit the camaro forums for a different point of view. If you are building it for hp and don't care about sound I'd just remove the stock restrictions and skip on the over priced corsa exhaust and put it toward something that will add power.

A laptop and datalogging/tunning software would be a good first buy also. I use datamaster TTS, TunerCat, PCMFORLESS tune, with a Moates.net cable on my 95.
I started looking in to this, but who makes a programmer for 96?
It's OBD-II..
Reply
Old Sep 25, 2008 | 12:12 PM
  #56  
lt4obsesses's Avatar
lt4obsesses
Le Mans Master
15 Year Member
 
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Default

Well, if you want massive, immediate results, you can go with the Hot Cam Kit. GM hot cam, a little lopey but very streetable, springs, 1:6 aluminum rockers, LT4 timing set. Earlier this year I met a guy at the track, this set up, ran low 12's. In terms of exhaust, Headers are great but for bang for the buck this will get you there quicker. Headers might get you 8-10 hp right now, or this kit for 30-40 right now. About the same money and direct fit. JMHO
Reply
Old Sep 25, 2008 | 01:07 PM
  #57  
mhack's Avatar
mhack
Thread Starter
Instructor
 
Joined: Sep 2008
Posts: 116
Likes: 0
From: Tampa FL
Default

Originally Posted by lt4obsesses
Well, if you want massive, immediate results, you can go with the Hot Cam Kit. GM hot cam, a little lopey but very streetable, springs, 1:6 aluminum rockers, LT4 timing set. Earlier this year I met a guy at the track, this set up, ran low 12's. In terms of exhaust, Headers are great but for bang for the buck this will get you there quicker. Headers might get you 8-10 hp right now, or this kit for 30-40 right now. About the same money and direct fit. JMHO
I'm kind of keeping an eye on that cam.
Will drive it for a while and then definately thinking of the cam for it.

p.s. Here are my results for 1/4 mile with very soft launch - http://forums.corvetteforum.com/show....php?t=2142054
Reply

Get notified of new replies

To New owner - what mods to do first..

Old Sep 26, 2008 | 03:20 PM
  #58  
aboatguy's Avatar
aboatguy
Race Director
15 Year Member
 
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Default

I agree with Rick on the converter (I have a 2800 stall) on my DD with 3.45s and I'm going to replace it with a 3400-3600 stall.

As for descreening the MAF it is not a restriction on the LT1s and lots of LT1 experts will tell you not to do it (professionals not internet keyboard warriors).
The free mods where a waste of my time (TB bypass and the like)

IMO the best bang for the buck on a LT1 C4 is a gear and TC swap. ....and check my sig I've done most of them. Headers helped the most when I finally did my head cam swap. Poly bushings really improved the way it feels above 170 (Im sure lowering helped too)

MIke
Reply
Old Sep 26, 2008 | 11:15 PM
  #59  
mhack's Avatar
mhack
Thread Starter
Instructor
 
Joined: Sep 2008
Posts: 116
Likes: 0
From: Tampa FL
Default

Originally Posted by aboatguy
I agree with Rick on the converter (I have a 2800 stall) on my DD with 3.45s and I'm going to replace it with a 3400-3600 stall.

As for descreening the MAF it is not a restriction on the LT1s and lots of LT1 experts will tell you not to do it (professionals not internet keyboard warriors).
The free mods where a waste of my time (TB bypass and the like)

IMO the best bang for the buck on a LT1 C4 is a gear and TC swap. ....and check my sig I've done most of them. Headers helped the most when I finally did my head cam swap. Poly bushings really improved the way it feels above 170 (Im sure lowering helped too)

MIke
Thank you for the info.
How does 2800 change the DD feel?
Also what kind of cam did you get?

"way it feels above 170 " - not sure what you are talking about?

What is the best place to get a 3.54 gears?

Last edited by mhack; Sep 26, 2008 at 11:36 PM.
Reply
Old Sep 27, 2008 | 06:52 PM
  #60  
aboatguy's Avatar
aboatguy
Race Director
15 Year Member
 
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Default

Originally Posted by mhack
Thank you for the info.
1. How does 2800 change the DD feel?
2. Also what kind of cam did you get?

3. "way it feels above 170 " - not sure what you are talking about?

What is the best place to get a 3.54 gears?
1. 2800 feels no different on the highway around town with the stock engine it felt a little like a slipping tranny when using small amounts of gas, however, when using lots of go pedal its was amazing.

I wish I had gone bigger on the stall, my tuner believes a 3500 vig would be better for my current combo since I didn't stop with gears, and LTs.

2. I have a custom cam that works well with my 12.1:1 compression 355 with ported intake and heads from AI.

3. I pulled a D44 out of a manual car. Car used to feel light around 160-165mph.
Reply




All times are GMT -4. The time now is 06:37 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 11:09:53


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE