Notices
C5 General General C5 Corvette and C5 Z06 Discussion not covered in Tech
Sponsored by:
Sponsored by:

Why is my C5 slow?

Thread Tools
 
Search this Thread
 
Old 12-09-2006, 08:24 AM
  #21  
gpracer1
Le Mans Master
 
gpracer1's Avatar
 
Member Since: Feb 2006
Location: Phoenix AZ
Posts: 5,267
Received 38 Likes on 24 Posts

Default

Have a dyno run with A/F ratio reading done and get back to us.
Old 12-09-2006, 09:47 AM
  #22  
Jay-rod
Pro
 
Jay-rod's Avatar
 
Member Since: Jan 2005
Posts: 712
Likes: 0
Received 0 Likes on 0 Posts

Default

When I first bought my car it was very slow.The car sat for along time and had some bad gas and the plugs were toast(pucks fell off on 3).Do a tune up and put some fuel injector cleaner through it and beat the hell out of it on the highway for the full tank of gas.(run the tank very low to get all the old gas out.)The DR before you probably babied the car and now it is carboned up.JER
Old 12-09-2006, 10:23 AM
  #23  
Rans03
Melting Slicks
 
Rans03's Avatar
 
Member Since: Mar 2005
Location: Buckeye Country OH
Posts: 3,329
Likes: 0
Received 0 Likes on 0 Posts
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08

Default

Old 12-09-2006, 11:01 AM
  #24  
6spdC6
Team Owner
 
6spdC6's Avatar
 
Member Since: Apr 2005
Location: Northern NYs Adirondack Mountains,http://www.visitsacandaga.com.
Posts: 34,641
Received 146 Likes on 109 Posts

Default

Originally Posted by jah
Thanks guys, I can see that somethings wrong. I live in El Paso, TX and was told that this stock Auto Vette belonged to some doctor before he traded it in w/49,000 mi.


Thanks
There are two final drive ratios in the auto cars. Which one is in your car? That could explaine a lot
Old 12-09-2006, 11:40 AM
  #25  
BanditDude
Drifting
 
BanditDude's Avatar
 
Member Since: Aug 2004
Location: Dayton Ohio
Posts: 1,799
Likes: 0
Received 1 Like on 1 Post

Default

Originally Posted by jah
I will turn the traction control off next time (I can't believe I didn't think of that there!). Could this make that big of a difference?

What else can I check? Fuel/Air filters? Should I have a shop check it out? Will a diagnostic test tell me anything or do they have to do a dyno on it? About how much is that (incl. vette tax!)?
The air filter is the first thing to check. It's easy to get to, and you'll never make power if it's toast. You can find these for under $10 at any auto parts store.

Last edited by BanditDude; 12-09-2006 at 11:45 AM.
Old 12-09-2006, 11:50 AM
  #26  
CVG323
Race Director
 
CVG323's Avatar
 
Member Since: May 2006
Location: 1000 Vin Scully Ave, L.A California
Posts: 11,863
Received 66 Likes on 51 Posts

Default

time for a tune up

change your oil, fuel-air filters, spark plugs, spark plug wires, add an exhaust to help a little. good luck!
Old 12-09-2006, 11:51 AM
  #27  
mqqn
Le Mans Master
 
mqqn's Avatar
 
Member Since: Dec 2001
Location: Winchester TN
Posts: 7,785
Received 4 Likes on 3 Posts
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In V Veteran
St. Jude Donor '03-'04-'05-'06-'07-'11

Default

Hi jah -

Change out the fuel filter, make sure the air filter is not clogged -

Make sure there is not restriction in the exhaust pipes.

With 50k miles, it's not like it sat all the time.

I vote you have a fuel system issue - if you are not equipped to check it out yourself, it's time for a trip to a qualified tuner/mechanic.

best regards -

mqqn
Old 01-05-2007, 12:27 PM
  #28  
b.j.prescott
Instructor
 
b.j.prescott's Avatar
 
Member Since: Aug 2004
Posts: 100
Likes: 0
Received 0 Likes on 0 Posts
Default

check yr air flow,that things like a ramjet,the faster it goes the more air it uses.....it also depends on the factory path for air,anything bent on the bottom stops it up.....
Old 01-05-2007, 12:31 PM
  #29  
vettephysician
Racer
 
vettephysician's Avatar
 
Member Since: Jul 2006
Posts: 461
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by jah
Thanks guys, I can see that somethings wrong. I live in El Paso, TX and was told that this stock Auto Vette belonged to some doctor before he traded it in w/49,000 mi.

What steps do I take to check out problem areas. I think it might be the fuel or air delivery - change filters? Sorry, I didn't get 60' times, but I seemed to do well there. The other cars would pass me after we got half way down the 1/4 mile course.

Thanks
Belonged to some doctor before you got it?? Hmmmm....that there may be the crux of the problem...
Old 01-05-2007, 12:32 PM
  #30  
MyVetteDream
Race Director
Support Corvetteforum!
 
MyVetteDream's Avatar
 
Member Since: Feb 2004
Location: HOW FAST WAS I GOING OFFICER? Los Angeles Hating GM Dealership Service Dept.'s Since Sept. 2004
Posts: 11,651
Likes: 0
Received 6 Likes on 5 Posts
St. Jude Donor '04-'05-'06-'07

Default

You think your car is slow 'cause you don't really believe "there's always someone faster"... once you accept this concept.. you'll be happy with your ride
Old 01-05-2007, 12:36 PM
  #31  
bobc997615
Racer
 
bobc997615's Avatar
 
Member Since: Dec 2005
Location: bloomington Indiana
Posts: 321
Likes: 0
Received 3 Likes on 3 Posts

Default

I'd be looking behind the gas pedal for the brick that the old doctor put behind there!
Old 01-05-2007, 01:44 PM
  #32  
NJ Vette Guy
Burning Brakes
 
NJ Vette Guy's Avatar
 
Member Since: Feb 2006
Location: Ex BX... Ex NJ... Hello CT!!! CT
Posts: 899
Likes: 0
Received 2 Likes on 2 Posts
Default

Everyone is quick to blame the car......

But by what he posted (left the car in OD and left traction control on), I seriously doubt he even knows how to properly launch an A4.

If I were him, I would do a forum search on the proper launch technique.

Just for quick reference though, next time you go to the track:

1. Place the car in competition mode (you'll be happy you did).

2. Put the car in 3rd gear.... Let it do the shifting for you.

3. Put your left foot on the brake and hold the gas pedal down until the tachometer is holding around 1500 RPMs. If the wheels are slipping, then back off a little on the gas.... If they're not, then appliy a little more gas until just before the wheels spin.... DON'T SMOKE THE TIRES!!!

4. When the last yellow light lites, let off the brake and at the same time, push down the gas pedal..... Don't stomp it, but firmly press it all the way down. If you do it right, you won't "red light".

5. Hold on and pay attention to the road and the car, don't look at the other guy or the speedometer..... As you pass the finish line let off the gas and slowly apply the brakes, don't slam them on.

If you do that, I bet your track times will improve..... If not, then check out the car.

Good luck.......

Last edited by NJ Vette Guy; 01-05-2007 at 01:48 PM.
Old 01-05-2007, 01:45 PM
  #33  
bonnell
Melting Slicks
 
bonnell's Avatar
 
Member Since: Feb 2004
Location: Loudon/Lake Mary Tennessee/Florida
Posts: 2,791
Received 43 Likes on 39 Posts

Default

Originally Posted by MyVetteDream
You think your car is slow 'cause you don't really believe "there's always someone faster"... once you accept this concept.. you'll be happy with your ride
Not with a 15 second 1/4.
Old 01-05-2007, 02:51 PM
  #34  
B-ras
Melting Slicks
 
B-ras's Avatar
 
Member Since: Dec 2004
Location: I have to return some videotapes
Posts: 2,677
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Gannet
It doesn't matter what his 60' times are, what gear he was in, what driving mode he was in, etc. If he's only trapping 91 mph he's WAY down on power.
I don't see how any of these other variables could result in consistent 91mph trap speeds. Unless you're at half throttle down the strip, the car is down on power. Check/change air and fuel filters and plugs. If that fails, go get on a dyno and see what the A/F and timing look like.

BTW-is "jah" you initials or are you a Rastaman?
Old 01-05-2007, 03:02 PM
  #35  
Alcee1
Melting Slicks
 
Alcee1's Avatar
 
Member Since: Jul 2003
Location: Los Angeles Ca
Posts: 2,719
Likes: 0
Received 1 Like on 1 Post

Default

Originally Posted by jah
15.1,15.2,15.4,15.1

not sure about 60 times, but that part seems OK, my top end is where I lost - top speed always 91mph.

How can I check the right fuel delivery?

What other things can I check?
Dang dude, my 84 is faster than that, my 84 60ft times are 1.95-1.98 and I always beat a stock C5 in the 60, your 60 should be I would think around 2.00 give or take a few. but don't quote me.
Old 01-05-2007, 03:08 PM
  #36  
chaase
Team Owner
 
chaase's Avatar
 
Member Since: May 2003
Location: East Meadow NY
Posts: 23,461
Received 6 Likes on 6 Posts
St. Jude Donor '12

Default

Originally Posted by NJ Vette Guy
Everyone is quick to blame the car......

But by what he posted (left the car in OD and left traction control on), I seriously doubt he even knows how to properly launch an A4.
I have done all of the above things wrong at one point in time. I have launched a stock A4 w/TC ON, it doesn't radically alter the 60' times (maybe you loose a 1/10th). I have also run it in OD. If the car is put to WOT, the car should still shift properly (even if you are slow).

His MPH is way too low for it to be driving technique. The only times I had seen my MPH that low was if I got out of it during the launch because of serious traction issues. (i.e fishtailing etc)
Old 01-05-2007, 03:35 PM
  #37  
nitrojunky
Burning Brakes
 
nitrojunky's Avatar
 
Member Since: Sep 2001
Location: ATX
Posts: 893
Received 38 Likes on 21 Posts

Default

I think you said you're in el paso... altitude's a bitch, so you're always going to be slow...... but not that slow.

I didn't see too many symptoms listed other than it's slow times/speeds; any CEL's?

I'd look at:

cats
plugs
wires
af
fuel filter

Get notified of new replies

To Why is my C5 slow?

Old 01-05-2007, 03:36 PM
  #38  
Vetteman Jack
Administrator

Support Corvetteforum!
 
Vetteman Jack's Avatar
 
Member Since: Mar 2001
Location: In a parallel universe. Currently own 2014 Stingray Coupe.
Posts: 343,010
Received 19,303 Likes on 13,975 Posts
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-
'20-'21-'22-'23-'24
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran


Default

I'd recommend getting a tune up (plugs, filters, etc) and then if that doesn't get you back up to normal, see about getting a dyno tune.
Old 01-05-2007, 03:49 PM
  #39  
vettedream420
Racer
 
vettedream420's Avatar
 
Member Since: Sep 2006
Location: Mankato Minnesota
Posts: 262
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Gannet
It doesn't matter what his 60' times are, what gear he was in, what driving mode he was in, etc. If he's only trapping 91 mph he's WAY down on power. Like something on the order of 100 rwhp down. The car needs attention from a good Corvette mechanic. If it otherwise runs well (not rough or smoking) it has to be something relatively simple. That or somebody swapped in a L-48 while he wasn't looking!

I bet this guy is going to get the cheapest 100 rwhp boost on record.
Definatly get a tune and go to a closed road (or one with no cars on it at the time ) and work on your launch. If things dont improve, there is something wrong you just havent figured out yet.
Good Luck!
Old 01-05-2007, 04:04 PM
  #40  
Z16 #1669
Pro
 
Z16 #1669's Avatar
 
Member Since: Jan 2006
Location: Valdosta Georgia
Posts: 696
Likes: 0
Received 0 Likes on 0 Posts
Default

You Might want to look in a mirrorand be sure who you see looks like a race cars driver.


Quick Reply: Why is my C5 slow?



All times are GMT -4. The time now is 05:14 AM.