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

It is AHHH-LIVE!

Thread Tools
 
Search this Thread
 
Old Aug 20, 2010 | 07:11 AM
  #41  
Lemme's Avatar
Lemme
Drifting
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
Default

Very impressive.

Are you still using the stock MAF (255 g/s)? If so you must be pushing the limits.
Reply
Old Aug 20, 2010 | 07:14 AM
  #42  
Pete K's Avatar
Pete K
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Feb 2004
Posts: 12,518
Likes: 19
Default

Looks great Gregg!
Reply
Old Aug 20, 2010 | 07:56 AM
  #43  
WW7's Avatar
WW7
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
Default

Glad to see you got that bad boy in..Your going to love a 383....WW
Reply
Old Aug 20, 2010 | 08:13 AM
  #44  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Default

Originally Posted by GREGGPENN

I'm really happy. Plus, its running pretty darn well on the factory tune! (Some minor changes were made. As I drive it around, I wondered if it might take/like some extra timing, but not much to complain about. Nope, I can't complain... OTOH, it's time to plug in TunerProRT and see what's up. That'll be the next step.

BIG THANKS TO THE GUYS AT THE CF!!!

Greg,
Are you running the factory tune, or the chip I made for you? I believe you are running the chip that has the modifications made to support the larger injectors and other changes needed for your car. I would not want to give someone the wrong impression that the factory tune would work on your car with no changes. It is close but has changes needed to support your equipment.
Reply
Old Aug 20, 2010 | 12:17 PM
  #45  
GREGGPENN's Avatar
GREGGPENN
Thread Starter
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Default

Originally Posted by bjankuski
Greg,
Are you running the factory tune, or the chip I made for you? I believe you are running the chip that has the modifications made to support the larger injectors and other changes needed for your car. I would not want to give someone the wrong impression that the factory tune would work on your car with no changes. It is close but has changes needed to support your equipment.
I'm running the chip I burned using your parameters. So, the ECM knows the injectors are larger (and how they react at various voltages). I should have been more clear on this. Thanks Brian.

OTOH, I was suprised about how flexible the stock GM programming really is. Besides changing injector size/voltages, GM's program seems to be handing everything else pretty well. No codes and it's running pretty darn smooth. Thanks Brian!!!

Besides injector size/latency data, here are the other parms that were changed....
EGR off
AIR off
VATS off
WOT timing lowered for safety until more scans are completed
FAN turn-ons lowered to 195. (180 stat installed)

With the addition of a hi-flo water pump, I'm seeing max top-end temps around 215 degrees so far. My goal was to keep them down in the 205 range. (An alum radiator might still be warranted/ideal to create a good non-EGR environment.) Between that and the extra overlap of my aftermarket cam, this was how I'm address NOx fumes. Plus, I'm still running 6.2L-rated Magnaflow metallic spun CATS for hydrocarbons.

No emissions checks in my area but I want to keep it somewhat compliant.

Today I need to start running some scans to see if the motor is really as happy as it sounds!!!
Reply
Old Aug 20, 2010 | 12:17 PM
  #46  
onedef92's Avatar
onedef92
Team Owner
20 Year Member
 
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
Default

Clicked the video link. That's the stuff good, hard, firm, stiff, erections are made of right there. That thing sounds crazy dope!

I'll bet it runs like raped ape, too!

Last edited by onedef92; Aug 20, 2010 at 01:31 PM.
Reply
Old Aug 20, 2010 | 12:23 PM
  #47  
GREGGPENN's Avatar
GREGGPENN
Thread Starter
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Default

Originally Posted by Lemme
Very impressive.

Are you still using the stock MAF (255 g/s)? If so you must be pushing the limits.
Yes. And, IDK yet.
Reply
Old Aug 20, 2010 | 12:29 PM
  #48  
GREGGPENN's Avatar
GREGGPENN
Thread Starter
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Default

Originally Posted by onedef92
Clicked the video link. That's the stuff, good, hard, firm, stiff, erections are made of right there. That thing sounds crazy dope!

I'll bet the runs like raped ape, too!
From what I can tell so far! (Break-in is SOOO annoying! LOL)

Note: My vid is in photobucket. I'm thinking it doesn't do as well (with file-sharing and/or processor speed) as YouTube. Don't be suprised if it takes a few seconds for the video to load/play.

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 Aug 20, 2010 | 12:34 PM
  #49  
Aardwolf's Avatar
Aardwolf
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
Default

Be careful with WOT, the A/F ratio was way off on mine. Normal driving was fine with the stock tune. I plugged in a LC-1 wide band and WOT was 13.5! Mine pegs the MAF at 256, I don't think it matters for tuning the A/F with the WB.

Brian helped me out too. Thanks man!
Reply
Old Aug 20, 2010 | 01:01 PM
  #50  
GREGGPENN's Avatar
GREGGPENN
Thread Starter
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Default

Originally Posted by Aardwolf
Be careful with WOT, the A/F ratio was way off on mine. Normal driving was fine with the stock tune. I plugged in a LC-1 wide band and WOT was 13.5! Mine pegs the MAF at 256, I don't think it matters for tuning the A/F with the WB.
13.5 doesn't sound "way off". Since PE is 12.5, you were still getting power enrichment and lower than stoich.

Hope I don't need a wideband (vs using BLMs). I just had the shop tack in a new O2 bung plug for the passenger side. The one that came with my headers had already vibrated out! LOL

Another funny story...
When I got to the exhaust shop (20 minutes from my home), I noticed antifreeze dribbling on the ground. Turned out I'd forgotten to tighten the bottom radiator (to radiator) hose connection. :o I'd only lost about an inch of water and it didn't blow off the tube. Guess I'm lucky!

I'm surprised I didn't see any drips after startup in garage and shorter runs around the block!!! (OTOH, the new hose was pretty snug.)

No other leaks though. No oil/fuel drips. Tranny sounds good (with new pilot bearing). Power steering is whining a bit though. It's the first time in 21yrs that it's been removed and COMPLETELY emptied. I wonder if it doesn't like fresh fluid or if it doesn't like that I used plain-old PS fluid?
Reply
Old Aug 20, 2010 | 01:12 PM
  #51  
Aardwolf's Avatar
Aardwolf
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
Default

The BLM's were great on mine but it was still to lean A/F at WOT.
Reply
Old Aug 20, 2010 | 05:28 PM
  #52  
GREGGPENN's Avatar
GREGGPENN
Thread Starter
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Default

Originally Posted by Aardwolf
The BLM's were great on mine but it was still to lean A/F at WOT.
13.5:1 doesn't sound "way off", but I understand power was left on the table. I'll use a dyno to tune WOT runs. (Do they put a WB in the O2 bung or measure at the exhaust pipe?)
Reply
Old Aug 20, 2010 | 05:30 PM
  #53  
GREGGPENN's Avatar
GREGGPENN
Thread Starter
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Default

Best thing I noticed today is that 3rd AND 4th gear pull WAY harder than they used to. This car is now a full-fledged sports car!

Reply
Old Aug 20, 2010 | 05:54 PM
  #54  
Caboboy's Avatar
Caboboy
Le Mans Master
20 Year Member
Veteran: Navy
St. Jude 20 Year Donor
All Eyes On Me
 
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Default

Congrats man, it's way cool to see your hard work pay off
Reply
Old Aug 20, 2010 | 08:12 PM
  #55  
Orr89rocz's Avatar
Orr89rocz
Burning Brakes
 
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
Default

quick check, is on a wot pull if you do one, watch the o2 sensor milivolts. They should be around 900-920mv for a fairly safe region.

My 383 was running ok on mild modifed bin, but WOT was 17 to 1 on mine Took alot of PE to get near 13.0
Reply
Old Aug 21, 2010 | 09:04 AM
  #56  
AGENT 86's Avatar
AGENT 86
Team Owner
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Active Streak: 90 Days
 
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Default

Nice work, she looks great !!
Reply
Old Aug 21, 2010 | 10:23 AM
  #57  
STL94LT1's Avatar
STL94LT1
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Default

That may be the best looking C4 engine on this forum, good work!!
Reply

Get notified of new replies

To It is AHHH-LIVE!

Old Aug 21, 2010 | 01:42 PM
  #58  
alrosenzweig's Avatar
alrosenzweig
Advanced
10 Year Member
 
Joined: Jun 2010
Posts: 85
Likes: 1
From: Everett Washington
St. Jude Donor '11
Default

after those pics.... I won't be postin mine that's just friggin unbelievable Gregg.... if mine takes 3 yrs the wife will either kill or leave me !!! Really nice work
Reply
Old Aug 21, 2010 | 10:53 PM
  #59  
mrc24x's Avatar
mrc24x
Burning Brakes
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2005
Posts: 1,172
Likes: 9
From: '88 TPI L98/HotCam Powell, Ohio
Default

Congrats Greg! Looks great!
Reply
Old Aug 21, 2010 | 11:05 PM
  #60  
dogfish246's Avatar
dogfish246
Safety Car
10 Year Member
 
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Default

WOW that sounds and looks really nice!!! And by the sound of it, it preforms well too!!!! I like the old school Corvette valve covers
Reply



All times are GMT -4. The time now is 01:30 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 15:43:40


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