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

close to 12 Sec. 1/4

Thread Tools
 
Search this Thread
 
Old Dec 6, 2012 | 01:37 PM
  #1  
sp361t's Avatar
sp361t
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
Default close to 12 Sec. 1/4

last time i was at the track i ran a 13.05@110 the best time i have every ran. my setup is a 383 with a 219 cam, 113 heads (mild port) stock TPI and stock exhaust manifolds with true duels and flowmaster mufflers.

I felt the 13.05 was a very good run especial with poor traction off the line (2.0 60Ft).

i am currently in the proses of switching to a LT1 intake and hopefully this will put me solidly in the 12's.

i was just curious of the difference when changing from the TPI to the LT1 intakes from the guys who have done it. Did you see a big change in loss of low end torque or was the loss not to noticeable and just saw an improvement in top end performance?

Thank you
Reply
Old Dec 6, 2012 | 01:44 PM
  #2  
TLS_Addict's Avatar
TLS_Addict
Team Owner
 
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Default

Hey man, if you want 12s just throw some good tires on it and you have it. You have plenty of MPH to be deep in to the 12s.

Figure a good set of tires can take off .1 - .2 from your 60 foot which means .2 - .4 off your time.
Reply
Old Dec 6, 2012 | 02:01 PM
  #3  
sp361t's Avatar
sp361t
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
Default

yea i know i am running nitto 555 right now and i do have a set of mickey T's but with the 6 speed i am worried about tearing something up, with being this close and not having everything done to the motor that i want (intake, headers) i think i will leave the mickeys off of it for now, i might get frogie and put time on for one pass though.
Reply
Old Dec 6, 2012 | 02:31 PM
  #4  
TLS_Addict's Avatar
TLS_Addict
Team Owner
 
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Default

Which version of the Nitto 555's though?

I was cutting 1.90's with a stock LS1 GTO anda 6-speed on them at full pressure.

You wont tear anything up if you dont just clutch dump. Also, you have a Dana 44 so you wont tear that out either.

What type of burn out are you doing?
Reply
Old Dec 6, 2012 | 08:49 PM
  #5  
gerardvg's Avatar
gerardvg
Safety Car
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2009
Posts: 3,752
Likes: 277
From: Melbourne, Victoria, Australia
Default

Originally Posted by sp361t
last time i was at the track i ran a 13.05@110 the best time i have every ran. my setup is a 383 with a 219 cam, 113 heads (mild port) stock TPI and stock exhaust manifolds with true duels and flowmaster mufflers.

I felt the 13.05 was a very good run especial with poor traction off the line (2.0 60Ft).

i am currently in the proses of switching to a LT1 intake and hopefully this will put me solidly in the 12's.

i was just curious of the difference when changing from the TPI to the LT1 intakes from the guys who have done it. Did you see a big change in loss of low end torque or was the loss not to noticeable and just saw an improvement in top end performance?

Thank you
My 85 with just headers cold air intake and adjustable fuel pressure regulator set at 45 psi and a tune up did 13.4 quarters before i put the blower on so you need better tires for sure
She is now heaps faster with 8 psi boost and 383 bottom end just less tractable off the line.

A mini ram set up should help you with a wilder camshaft profile, no need for a hot cam with the TPI setup as she will choke past 5,500

If you want to rev to 7,500-8,500 yes go mini ram, if you do not want to go past 6,000 keep the tpi and get better tires / diff gearing to hook you up better. remember usable power tpi mild camshaft 1,200-5,500rpm Mini ram and wild camshaft 4,000-8,500
so decide if you want a road car or race car.
I had car in the past that would rev to 8,500 rpm but was a pig to drive on the roads.

Reply
Old Dec 6, 2012 | 10:29 PM
  #6  
Tom400CFI's Avatar
Tom400CFI
Team Owner
Pro Mechanic
20 Year Member
 
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Default

Originally Posted by gerardvg
If you want to rev to 7,500-8,500 yes go mini ram, if you do not want to go past 6,000 keep the tpi and get better tires / diff gearing to hook you up better. remember usable power tpi mild camshaft 1,200-5,500rpm
I don't know any stock TPI intakes making usable power to 5500. OP said nothing of an aftermarket TPI. Conversely, I don't think you need to be going to 8500 to see the benefits of a mini ram, either.

OP: Work on your burn out and launch. You should be able to go sub 2.0/60' with your current set up and that will get right into the 12's. I agree that your 110 trap is additional evidence that your car has a 12 in it.
Reply
Old Dec 6, 2012 | 10:53 PM
  #7  
JackDidley's Avatar
JackDidley
Race Director
20 Year Member
Active Streak: 30 Days
Liked
Loved
 
Joined: Sep 2003
Posts: 16,839
Likes: 341
From: Database Error Indiana
Default

The LT1 intake should do it. I tried all sorts of stuff looking for 12s with a TPI. Miniram took me from 13.1 to 12.80. LT1 intake is very similar.
Reply
Old Dec 7, 2012 | 10:08 AM
  #8  
TLS_Addict's Avatar
TLS_Addict
Team Owner
 
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Default

Why not use an LT4 intake or an Edelbrock LT4 Air gap if you are going to do it? They are even better yet.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-1

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-2

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-3

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-4

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-5

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-6

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-7

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

 Joe Kucinski
story-8

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-9

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

 Michael S. Palmer
Old Dec 7, 2012 | 10:28 AM
  #9  
sp361t's Avatar
sp361t
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
Default

i know the car as a 12 in i did pull a 1.94 short time earlier but i only ran a 13.3 because i did not have my tune correct.

my goal is not to have a 8,000 RPM motor but a good solid mid range (6000 RPM) engine that with the Nitto 555 street tire can lay down a steady 12 second pass and i think the LT1 intake will do that epically for the cost compared to the aftermarket intakes.

also with switching to the LT1 intake i think that will help curb the low end torque and possible help me maintain a better short time (sub 2.0) because of the lack of a drag slick.

TLS: i am using the LT1 intake because i already had it, agreed i think if i was going to buy one it would be cool to convert the edelbrock LT4 intake.
Reply
Old Dec 7, 2012 | 10:30 AM
  #10  
TLS_Addict's Avatar
TLS_Addict
Team Owner
 
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Default

Good option.

You will suprise A LOT of people with that car at the strip, that is for sure.

C4's are sleeps because nobody thinks of them as fast anymore.
Reply
Old Dec 7, 2012 | 12:09 PM
  #11  
TA's Avatar
TA
Team Owner
25 Year Member
Top Answer: 1
Top Answer: 3
Top Answer: 5
 
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Default

Easy 12s with good traction. I'd even say mid 12s and maybe lower on a good weather day with that MPH. With my old TPI motor I regularly went mid to high 12s at 106 or so. Now, I do have an auto trans with a 2500 stall TC, so that obviously helps me get off the line pretty well. That being said, I still see no reason your car isn't capable of mid 12s with that MPH. BTW, go with the MT drag radials


Coincidentally, my new engine sounds virtually identical to your's (383, 219 cam, ported 113s). I've only gotten to the track once so far, but it went 11.96 at 114 on the second pass and that was in July (hot). I'm hoping for mid 11s with the cooler weather..........any faster I'm gonna get booted off the track
Reply
Old Dec 7, 2012 | 12:43 PM
  #12  
TLS_Addict's Avatar
TLS_Addict
Team Owner
 
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Default

Most of the PA tracks do the 11.50 and up no cage. lol
Reply
Old Dec 7, 2012 | 01:25 PM
  #13  
sp361t's Avatar
sp361t
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
Default

TA: your getting me excited now talking about an 11 second pass with 113 heads i still need to get headers and the intake installed to let this 383 breathe

if i get to the point were i feel that tires would sink me into the 11's i would not be able to resist putting them on, breaking parts be damned lol.
Reply
Old Dec 7, 2012 | 01:25 PM
  #14  
sp361t's Avatar
sp361t
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
Default

TA: what intake do you run? what RPM are you twisting?
Reply
Old Dec 7, 2012 | 01:43 PM
  #15  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,161
Likes: 554
From: Glenbeulah Wi
Default

Originally Posted by sp361t
last time i was at the track i ran a 13.05@110 the best time i have every ran. my setup is a 383 with a 219 cam, 113 heads (mild port) stock TPI and stock exhaust manifolds with true duels and flowmaster mufflers.

I felt the 13.05 was a very good run especial with poor traction off the line (2.0 60Ft).

i am currently in the proses of switching to a LT1 intake and hopefully this will put me solidly in the 12's.

i was just curious of the difference when changing from the TPI to the LT1 intakes from the guys who have done it. Did you see a big change in loss of low end torque or was the loss not to noticeable and just saw an improvement in top end performance?

Thank you
I switched from the big tube long tube runner design TPI to the superram and picked up 38 RWHP with no other changes on a 355 with the 219 cam and 195cc trick flow heads. The car appeared to have no loss of low end and ran more then 1/2 second faster in the 1/4. I then switched to a modified lt1 intake and picked up 22 more RWHP over the superram and the car felt just as strong on the low end hit but in the 1/4 it did not run any faster. Almost identical ET's between the superram and LT1 intake with all other things being the same. The car was a full weight 1986 and it ran 11.82 at 114 MPH on its best run with this combination. I would assume your 383 with the 219 cam and good heads could equal that.
Reply
Old Dec 7, 2012 | 01:54 PM
  #16  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,161
Likes: 554
From: Glenbeulah Wi
Default

Originally Posted by gerardvg

If you want to rev to 7,500-8,500 yes go mini ram, if you do not want to go past 6,000 keep the tpi and get better tires / diff gearing to hook you up better. remember usable power tpi mild camshaft 1,200-5,500rpm Mini ram and wild camshaft 4,000-8,500
so decide if you want a road car or race car.


There is a lot of disinformation in this post. The lt1 intake is a fine street manifold, its power range is idle to 6500 RPM. These manifolds will not support 8500 RPM since they are too small to suppy enough air to a 383 at 8500 RPM. My 406 with the LT1 intake and ZZX cam peaked its torque at 2800 RPM and HP peaked at 6250 RPM. The manifold has a very flat torque curve that makes good power everywhere. It is designed as a anti-tuning system which means it does not use wave tuning to create the highest torque numbers or power numbers but it does make good all around power. The manifold runner lengths are actually tuned for 9200 RPM but the manifold is not capable of opeating at that point since it cannot flow enough air to support an engine operating at 9200 RPM.
Reply
Old Dec 7, 2012 | 02:31 PM
  #17  
TA's Avatar
TA
Team Owner
25 Year Member
Top Answer: 1
Top Answer: 3
Top Answer: 5
 
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Default

Originally Posted by sp361t
TA: what intake do you run? what RPM are you twisting?

I have an Accel intake and AS&M runners. I haven't touched the governor in the trans so it still shifts at stock shift points........around 5200 or so I think. Believe it or not the dyno of the new engine shows it making power all the way to 6k, so I'm thinking I might benefit a bit from bumping up the shift points.

I wouldn't be too concerned about breaking stuff. You should already have a D44 in your car. Obviously stuff can still break, but at our power levels I wouldn't be overly concerned. I have very few issues since I put in the D44 and that's with 60' times in the 1.6 to 1.7 range.
Reply

Get notified of new replies

To close to 12 Sec. 1/4

Old Dec 7, 2012 | 02:34 PM
  #18  
TA's Avatar
TA
Team Owner
25 Year Member
Top Answer: 1
Top Answer: 3
Top Answer: 5
 
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Default

Originally Posted by TLS_Addict
Most of the PA tracks do the 11.50 and up no cage. lol
I've only ever run at NJ tracks (Etown/Atco) and both are NHRA tracks (sub 11.50 requires a cage).
Reply
Old Dec 7, 2012 | 03:00 PM
  #19  
TLS_Addict's Avatar
TLS_Addict
Team Owner
 
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Default

Come up to Beaver and run with us. Be prepared for a .2-.3 at a minimum loss in your times. lol
Reply
Old Dec 8, 2012 | 02:41 PM
  #20  
rlane5's Avatar
rlane5
Pro
20 Year Member
 
Joined: May 2002
Posts: 635
Likes: 6
From: New Jersey
Default

I have done a LT1 conversion, and pick up .5 and 5 MPH with mine. What gears and converter do you have?
Randy
Reply



All times are GMT -4. The time now is 05:03 PM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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