C4 General Discussion General C4 Corvette Discussion not covered in Tech

E/T Times

Thread Tools
 
Search this Thread
 
Old Aug 17, 2009 | 04:13 PM
  #1  
C41987's Avatar
C41987
Thread Starter
Racer
 
Joined: Aug 2008
Posts: 302
Likes: 0
From: Lebanon MO
Default E/T Times

I haven't been to a strip in forever, and my fever is getting up, so I have a couple questions before I go and make myself look like a fool.
A stock 87 (FlowMaster & K&N Air Filter only mods) will run around 14 sec in the quarter, right? What will it run in the 1/8 mile? Thinking about what class I would be in.
My air pressure is @50psi now, what should it be for dragging? Same, lower and how much lower. Street tires 295/35/18's(all 4) I believe.
Will taking spare out really make much of a difference?
4-tenths tree means 3 yellow light at one time and then green, or each yellow light lights, then green. Which is it?
No disrespect intended, but personal experience only, please. Thanks
Reply
Old Aug 17, 2009 | 05:09 PM
  #2  
vettestir1's Avatar
vettestir1
Advanced
 
Joined: Oct 2008
Posts: 70
Likes: 0
From: Marysville WA
Default

Originally Posted by C41987
I haven't been to a strip in forever, and my fever is getting up, so I have a couple questions before I go and make myself look like a fool.
A stock 87 (FlowMaster & K&N Air Filter only mods) will run around 14 sec in the quarter, right? What will it run in the 1/8 mile? Thinking about what class I would be in.
My air pressure is @50psi now, what should it be for dragging? Same, lower and how much lower. Street tires 295/35/18's(all 4) I believe.
Will taking spare out really make much of a difference?
4-tenths tree means 3 yellow light at one time and then green, or each yellow light lights, then green. Which is it?
No disrespect intended, but personal experience only, please. Thanks
Well first off you should be around 9.0 to 9.5 in the 1/8. As for tire pressure with street tire it all depends on the tire and rim size. Start off with what the tire is rated at on the sidewall and see how it hooks up. If the track is preped good with a stock car you should be ok. Are you an auto or stick? I wouldn't go more then 10lb under that but you will have to work your way there. You can take the spare out but you might not notice any difference. Now the last one is a .4 pro tree all 3 yellow then green. I don't know why they would use that tree at your track but you will never cut a good light on it. I have a low 12sec car and ran a pro tree once. I had to deep stage just to get a .1 light very hard. Most tracks will use a .5 sportsman, tree each yellow light then green every 1/2 sec. I hope that answers your questions good luck and have fun.
Reply
Old Aug 17, 2009 | 05:33 PM
  #3  
C41987's Avatar
C41987
Thread Starter
Racer
 
Joined: Aug 2008
Posts: 302
Likes: 0
From: Lebanon MO
Default

Originally Posted by vettestir1
Are you an auto or stick?I hope that answers your questions good luck and have fun.
I knew I forgot something. It's an auto. I also said 14sec quarter, because that's what I've seen as a stock time. Guess that's right? Tires say 50lbs, so nothing under 40lbs. Thanks for your insight. I can't wait. It's been 20 yrs since I've been to the track. I used to help a guy w/65 Nova @10.90's, and I loved every minute of it. Everybody has to start somewhere, right?

Last edited by C41987; Aug 17, 2009 at 05:36 PM.
Reply
Old Aug 17, 2009 | 06:16 PM
  #4  
vettestir1's Avatar
vettestir1
Advanced
 
Joined: Oct 2008
Posts: 70
Likes: 0
From: Marysville WA
Default

I didn't know that 18's were rated at 50psi. You can test the tires in a safe place just look at the marks and get them to print even. If you go to low the tires will cup and print heavy on the outsides. With an auto you shouldn't have any problem. The more air the less roll resistance the faster you go. Have fun out there and be safe.
Reply
Old Aug 17, 2009 | 08:16 PM
  #5  
rodj's Avatar
rodj
Le Mans Master
25 Year Member
 
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Default

Originally Posted by C41987
Tires say 50lbs, so nothing under 40lbs
50 psi seem very high for street use; how does your car ride? Stock is more like 35psi.

Shallow stage;
Turn the top staging light on and just tickle car in until the 2nd light comes on.Don't roll any further.
Leave on the last yellow; wait for the green and you will lose.
With stock car you will probally get better launch results launching off idle ( hold about 1000 rpm ); rather that trying to load up revs on the convertor.
Make sure you know where the finish line is so you don't back off too soon.
Reply
Old Aug 17, 2009 | 08:41 PM
  #6  
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

My 87 ran very low 9s in the 1/8 and very low 14s in the 1/4 when I got it as a 35000 mile original. 100000 miles later, it runs 12s , not so original.
Reply
Old Aug 18, 2009 | 07:07 AM
  #7  
tpivette's Avatar
tpivette
Pro
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jan 2003
Posts: 515
Likes: 3
From: newark DE
Default

the PSI rating on the side of the tire is the MAX rating... dont ever set your pressure at that!!! 32 - 35 psi at most, any higher and youll develop an uneven wear pattern in your tread

my 89 (very similar to your 87) went 13.9 at 99mph with a 2.0 60ft in good air. i decreased my tire pressure to around 18 - 20 psi for those runs. i also iced my intake manifold between passes and let the motor cool to around 140* on each run

good luck and have fun!
Reply

Get notified of new replies

To E/T Times





All times are GMT -4. The time now is 08:08 PM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
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-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

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


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