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

LTCC Conversion

Thread Tools
 
Search this Thread
 
Old Jul 13, 2015 | 06:15 AM
  #41  
TorchTarga94's Avatar
TorchTarga94
Thread Starter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2011
Posts: 2,605
Likes: 202
From: Trinity FL
Default

Originally Posted by STEVEN13
Great Thread and install!

I too am considering going with this as I want to add a rev limiter and 2 step. I was all set to get an MSD 6AL-2 but after researching-it seems in many cases it can damage the rotor and cap. My opti is working fine so I may go this route.

What wires did you solder? I may of missed it.

Thank you, there are four wires that I soldered.



LTCC to Factory Wiring
-Two Pink from LTCC to single pink w/black stripe on factory ICM connector.

-White wire with black dot from LTCC to white wire on gray factory coil connector

-Solid white wire from LTCC to solid white wire on factory ICM connector


The two yellow wires are for the activation of the two-step built in adjustable N2O / boost retard. I've heard of people connecting these wires to the window switch to activate it. I didn't delve much into this area as I plan on keeping near stock.



I ran the car pretty hard on Saturday got the temp up to 227 degrees in Tampa on Patterson road. Had a little fun with a GSX-R 750. The car never skipped a beat. Ran perfect, Hurst short throw felt like a dream rowing through the gears. Need the exhaust to have a little more character though in my opinion. May switch back to muffler eliminators.
Reply
Old Jul 14, 2015 | 07:54 AM
  #42  
STEVEN13's Avatar
STEVEN13
Melting Slicks
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2003
Posts: 2,270
Likes: 118
From: N. Babylon NY
Default

Originally Posted by TorchTarga94
Thank you, there are four wires that I soldered.



LTCC to Factory Wiring
-Two Pink from LTCC to single pink w/black stripe on factory ICM connector.

-White wire with black dot from LTCC to white wire on gray factory coil connector

-Solid white wire from LTCC to solid white wire on factory ICM connector


The two yellow wires are for the activation of the two-step built in adjustable N2O / boost retard. I've heard of people connecting these wires to the window switch to activate it. I didn't delve much into this area as I plan on keeping near stock.



I ran the car pretty hard on Saturday got the temp up to 227 degrees in Tampa on Patterson road. Had a little fun with a GSX-R 750. The car never skipped a beat. Ran perfect, Hurst short throw felt like a dream rowing through the gears. Need the exhaust to have a little more character though in my opinion. May switch back to muffler eliminators.
Thanks for the response and great information!

If I go this way I will post my results in this thread.

Reply
Old Jul 14, 2015 | 08:32 PM
  #43  
bogus's Avatar
bogus
Team Owner
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Default

Originally Posted by TorchTarga94
Thank you, there are four wires that I soldered.



LTCC to Factory Wiring
-Two Pink from LTCC to single pink w/black stripe on factory ICM connector.

-White wire with black dot from LTCC to white wire on gray factory coil connector

-Solid white wire from LTCC to solid white wire on factory ICM connector


The two yellow wires are for the activation of the two-step built in adjustable N2O / boost retard. I've heard of people connecting these wires to the window switch to activate it. I didn't delve much into this area as I plan on keeping near stock.



I ran the car pretty hard on Saturday got the temp up to 227 degrees in Tampa on Patterson road. Had a little fun with a GSX-R 750. The car never skipped a beat. Ran perfect, Hurst short throw felt like a dream rowing through the gears. Need the exhaust to have a little more character though in my opinion. May switch back to muffler eliminators.
Personally, I hate the boom from eliminators... and with more and more towns adopting noise regs, it seems easier to stick with a nice aftermarket exhaust. I am a huge fan of Corsa... sounds great during WOT, but quiet enough at cruise that you won't go deaf.

And yes, I have had both!!!
Reply
Old Jul 14, 2015 | 10:54 PM
  #44  
TorchTarga94's Avatar
TorchTarga94
Thread Starter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2011
Posts: 2,605
Likes: 202
From: Trinity FL
Default

Originally Posted by bogus
Personally, I hate the boom from eliminators... and with more and more towns adopting noise regs, it seems easier to stick with a nice aftermarket exhaust. I am a huge fan of Corsa... sounds great during WOT, but quiet enough at cruise that you won't go deaf.

And yes, I have had both!!!
Ive had the eliminators as well and miss them at times especially with targa off. I have the Magnaflow catback right now, and while it sounds good, it sort of lacks character. I don't see myself spending bookoo money on a Corsa system...




Edit (8/31/17)- unrelated to thread but I did end up ditching the Mags and going with Corsa



Last edited by TorchTarga94; Aug 31, 2017 at 09:12 PM.
Reply
Old Jul 15, 2015 | 12:10 AM
  #45  
1993C4LT1's Avatar
1993C4LT1
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2011
Posts: 16,087
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Default

Bookoo money hey, I agree with you on the corsa tho. Try out the chambered muff elims. I'll try and get you a sound clip tomorrow. And I heard a C4 with the Magnaflow. It was too quiet for me.
Reply
Old Jul 15, 2015 | 06:53 AM
  #46  
TorchTarga94's Avatar
TorchTarga94
Thread Starter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2011
Posts: 2,605
Likes: 202
From: Trinity FL
Default

Originally Posted by 1993C4LT1
Bookoo money hey, I agree with you on the corsa tho. Try out the chambered muff elims. I'll try and get you a sound clip tomorrow. And I heard a C4 with the Magnaflow. It was too quiet for me.


I'm honestly content with the volume of the Magnaflow system, I am more concerned with tone. To me the Magnaflow system sounds good but it just kind of has a boring monotone bass sound. It lacks the burble and tone like a stock Mustang GT has. Will have to figure something out.
Reply
Old Aug 31, 2017 | 09:09 PM
  #47  
TorchTarga94's Avatar
TorchTarga94
Thread Starter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2011
Posts: 2,605
Likes: 202
From: Trinity FL
Default

I just wanted to bump this thread for anyone out there that may have been interested in the conversion but couldn't see the original pics from back in 2015. I went through and deleted all the photobucket links that are now broken and reuploaded them through the forum itself. Hoping this thread can help anyone out in the future. I have not (fingers crossed) been stranded since doing the conversion. Before it, I went through 3 optis due to no good aftermarket replacements and a dried up reserve of NOS Mitsubishi units.
Reply
Old Aug 31, 2017 | 11:51 PM
  #48  
1993C4LT1's Avatar
1993C4LT1
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2011
Posts: 16,087
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Default

Originally Posted by TorchTarga94
I just wanted to bump this thread for anyone out there that may have been interested in the conversion but couldn't see the original pics from back in 2015. I went through and deleted all the photobucket links that are now broken and reuploaded them through the forum itself. Hoping this thread can help anyone out in the future. I have not (fingers crossed) been stranded since doing the conversion. Before it, I went through 3 optis due to no good aftermarket replacements and a dried up reserve of NOS Mitsubishi units.
Awesome of you to do that
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-1

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

 Joe Kucinski
story-2

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-3

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

 Michael S. Palmer
story-4

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

 Joe Kucinski
story-5

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

 Joe Kucinski
story-6

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

 Verdad Gallardo
story-7

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

 Joe Kucinski
story-8

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

 Verdad Gallardo
story-9

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
Old Nov 22, 2019 | 06:43 PM
  #49  
lt4 coupe's Avatar
lt4 coupe
Racer
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Jul 2016
Posts: 299
Likes: 15
Default

Originally Posted by TorchTarga94
I just wanted to bump this thread for anyone out there that may have been interested in the conversion but couldn't see the original pics from back in 2015. I went through and deleted all the photobucket links that are now broken and reuploaded them through the forum itself. Hoping this thread can help anyone out in the future. I have not (fingers crossed) been stranded since doing the conversion. Before it, I went through 3 optis due to no good aftermarket replacements and a dried up reserve of NOS Mitsubishi units.
Id like to bump by saying, I was recommended this system by Lingenfelter when I asked them how they recommend retarding the timing on my LT-4 when on Nitrous. Is there not an easier way? Ive got the Gen 2 Opti with no problems and even had it, "rebuilt" and updated by the guy everyone recommends (new cap rotor and bearing/seals).
Reply
Old Nov 22, 2019 | 07:16 PM
  #50  
Charsel's Avatar
Charsel
Instructor
 
Joined: Oct 2017
Posts: 199
Likes: 24
From: Palmetto FL
Default

Saccity opti seems fine after 3 months; prior AC Delco 2 in 2 months. Saccity very easy to talk to, and will answer any questions about product. Plus 2 yr warranty
Reply
Old Nov 22, 2019 | 08:02 PM
  #51  
dizwiz24's Avatar
dizwiz24
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 14,674
Likes: 751
From: NEwhere Ohio
Default

Originally Posted by Charsel
Saccity opti seems fine after 3 months; prior AC Delco 2 in 2 months. Saccity very easy to talk to, and will answer any questions about product. Plus 2 yr warranty
yep sounds like an ac delco remanufactured in china optispark
not a NOS OEM optispark
Reply
Old May 9, 2020 | 01:24 PM
  #52  
TorchZ51's Avatar
TorchZ51
Pro
Conversation Starter
All Eyes On Me
Photogenic
Liked
 
Joined: Oct 2017
Posts: 565
Likes: 203
Default

Bumping an old thread as I just finished up the LTCC conversion on my 94. Fun project that will greatly improve the reliability of the ignition system! I have $550 all in using take off LS2 coils and a new plug wire kit. I made the aluminum brackets to mount the coils.

Reply
Old May 9, 2020 | 06:36 PM
  #53  
1993C4LT1's Avatar
1993C4LT1
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2011
Posts: 16,087
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Default

Nicely done!
Reply
Old May 9, 2020 | 07:33 PM
  #54  
Nomake Wan's Avatar
Nomake Wan
Drifting
 
Joined: Apr 2020
Posts: 1,925
Likes: 610
From: Orange, CA
Default

Very cool! What exactly are the brackets fixed to? Looks like the same coils I have. Any chance you'd be willing to make some more brackets? I'd be interested in ones that actually fit the '94-'96 valve covers, all the ones I've seen were for the older cover design.
Reply
Old May 9, 2020 | 08:44 PM
  #55  
TorchZ51's Avatar
TorchZ51
Pro
Conversation Starter
All Eyes On Me
Photogenic
Liked
 
Joined: Oct 2017
Posts: 565
Likes: 203
Default

Originally Posted by Nomake Wan
Very cool! What exactly are the brackets fixed to? Looks like the same coils I have. Any chance you'd be willing to make some more brackets? I'd be interested in ones that actually fit the '94-'96 valve covers, all the ones I've seen were for the older cover design.
I started with 1/8” aluminum sheet and sheared it to size. The aluminum plate is bolted to the valve covers by removing the OEM bolts and adding 1/2” spacers with longer M6 bolts. You’ll also need to make some standoffs to mount the coils to the aluminum plate. I needed to remove the A.I.R pipes on both exhaust manifolds for clearance. Lastly, a longer oil fill neck with a push in oil cap or filter is needed.

Last edited by TorchZ51; May 9, 2020 at 08:47 PM.
Reply
Old May 9, 2020 | 10:53 PM
  #56  
1993C4LT1's Avatar
1993C4LT1
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2011
Posts: 16,087
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Default

I don't have the 93 anymore. But car is running top with the new owner Still. But I also had clearance issues with the AIR. My dad looked at it, and said, "just flip those coils son". He was right

Not as proper looking. But I was/am proud of it. And it got the job done.

Reply
Old Dec 28, 2020 | 08:23 AM
  #57  
Casethecorvetteman's Avatar
Casethecorvetteman
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Default

@bogus i remember you had this setup wayyyy back when i very first met you on here, that must be well over 15 years ago now

Does anyone have any photos of coils installed in a better location? Aint no way known i am installing coils on the rocker covers in my Callaway...


Reply

Get notified of new replies

To LTCC Conversion

Old Dec 28, 2020 | 01:54 PM
  #58  
jayjones's Avatar
jayjones
Racer
 
Joined: Mar 2018
Posts: 411
Likes: 97
From: Las Vegas
Default

Torquehead has a manifold bracket, but it's pricey



Reply
Old Dec 28, 2020 | 01:57 PM
  #59  
Casethecorvetteman's Avatar
Casethecorvetteman
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Default

Originally Posted by jayjones
Torquehead has a manifold bracket, but it's pricey

Thanks, but that is not going in there either.

Surely someone has mounted them somewhere that doesn't look terrible and won't stand out like a sore thumb!
Reply
Old Jan 7, 2021 | 11:50 AM
  #60  
bogus's Avatar
bogus
Team Owner
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Default

I remember one user installed them on the side of the heads, above the headers. Real short plug wires that way. I am just not sure how well the coils will take the heat... unless the headers are seriously heat coated.

I got some brackets from a shop in Oklahoma, IIRC... I modified them to work with the LS2 coil (much better option, the spark does not break up at 6500 RPM like the LS1 coils do). These were super sharp looking billet, but they still covered the valve covers and that would suck with those bad *** killer covers you have.

Another option that I considered was the cross member... down around the radiator, but again, heat is a real concern. I know that was a popular place to put the DelTeq Northstar Coilpack module. Perhaps a small heat shield would help?

What are your emission laws like? Going with heat coated headers will buy you 30 hp, at least, and free up space. I know that some of the newest heat coatings will make the headers almost cool enough to touch when "hot". Amazing tech, came out of aerospace and I first read about this next gen stuff in a British car mag about race car engineering. This stuff was being used on 2-stroke racing motorcycles, and the mechanics could touch the exhaust with simply a mechanics glove and not melt their hands off. amazing, utterly amazing.

I had been planning on moving the LTCC brain into my glovebox, but that does require drilling a 15-20mm hole in the firewall! But it keeps the brain weather proof, and allows you to remove the metal cover, put on a clear cover (dust protection) and see the little LED in real time, if needed. Never did get around to doing that...

I installed LTCC back in 2003!!! And the guy who owns my 92 still is running it. It has proven to be very durable and works very well. I would do it again... I helped the designer by rewriting the install manual... AFAIK, that version is still being distributed... on occasion, I still get an email from someone with questions! It's been a couple of years (really, that recent), but I am glad to help.

As an aside, I ended up with a C6 - 2006 (very) Yellow coupe, 6spd. Base model. GREAT CAR! Love it to pieces.

Reply



All times are GMT -4. The time now is 06:45 PM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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
story-7
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-8
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-9
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