Problems launching at the track
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 996
Likes: 0
From: Frisco Texas
Problems launching at the track
I have been getting slower at the track each time I go. My 60's were in the 1.7X range then the 1.8X and now the 1.9X range. You can see my mods in my sig.
I am bogging off the line or blowing the tires up in smoke. If I launch from Idle the car bogs (converter doesnt seem to flash to 3800) and if I launch from 2k or higher it spins like crazy. I tried 1000-2000 launches but they are still in the 1.9 range.
Once I get moving the car feels strong but maybe running rich. I am only getting 9 mpg in the city and 22 on the highway. I plan to scan the car tomorrow.
I am also investing possible false knock. Can headers touching the subframe cause false knock. I am going to look at the knock multiplyer tomorrow also. I lost almost 3 mph from a week ago right after the engine went in. When I put a new program in from my HP tuners the car feels strong but after a day or 2 its starts feeling slugish.
I plan on getting this fixed this week because I want to drive the vette to Houston the following week.
So has anyone else gotten such crappy 60's on drag radials or such crappy gas mileage? Any suggestions would be apreciated.
BTW: I ran this last weekend:
60' = 1.82
1/8 = 7.80
mph= 91.87
Last night when it was 5 degrees cooler:
60' = 1.92
1/8 = 7.98
mph = 89.32
I am bogging off the line or blowing the tires up in smoke. If I launch from Idle the car bogs (converter doesnt seem to flash to 3800) and if I launch from 2k or higher it spins like crazy. I tried 1000-2000 launches but they are still in the 1.9 range.
Once I get moving the car feels strong but maybe running rich. I am only getting 9 mpg in the city and 22 on the highway. I plan to scan the car tomorrow.
I am also investing possible false knock. Can headers touching the subframe cause false knock. I am going to look at the knock multiplyer tomorrow also. I lost almost 3 mph from a week ago right after the engine went in. When I put a new program in from my HP tuners the car feels strong but after a day or 2 its starts feeling slugish.
I plan on getting this fixed this week because I want to drive the vette to Houston the following week.
So has anyone else gotten such crappy 60's on drag radials or such crappy gas mileage? Any suggestions would be apreciated.
BTW: I ran this last weekend:
60' = 1.82
1/8 = 7.80
mph= 91.87
Last night when it was 5 degrees cooler:
60' = 1.92
1/8 = 7.98
mph = 89.32
Burning Brakes
Joined: Jun 2005
Posts: 884
Likes: 0
I am running a 342/3500 yank 7# ati a4 on bfgs drags I get high 1.6s on 16-17psi I stall at 2500 and run 11.0s.I do a 10 count burnout,traction control will stick sometimes.Try and pay close att. in the burn box.Make sure you do a good dry hop to set the tires also.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Last weekend was ny very first time at the track!! 
WOW did I have a good time!!!! I learned a LOT!
I have an 02 Z06 with Stainless Works headers and a complete 3" exhaust, VARARAM, and 305 P-Zero tires.
I learned what sleeping at the light means
I progressively got better throughout the day and when I get some drag radials, i'll be back for some more fun.
My car dynoed at 375 rwhp and 365 tq.
Here is my best run.
RT - 535
60' - 2.058
1/4 - 12.729
MPH- 113.26
I was blazing the tires in 1st and 2nd. I beat the car hard all day and she didnt complain once!!
Bill C
WOW did I have a good time!!!! I learned a LOT!I have an 02 Z06 with Stainless Works headers and a complete 3" exhaust, VARARAM, and 305 P-Zero tires.
I learned what sleeping at the light means
I progressively got better throughout the day and when I get some drag radials, i'll be back for some more fun.My car dynoed at 375 rwhp and 365 tq.
Here is my best run.
RT - 535
60' - 2.058
1/4 - 12.729
MPH- 113.26
I was blazing the tires in 1st and 2nd. I beat the car hard all day and she didnt complain once!!
Bill C
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
cscollis
""Once I get moving the car feels strong but maybe running rich. I am only getting 9 mpg in the city and 22 on the highway. I plan to scan the car tomorrow.""
When I installed my headers and mararam, my mileage dropped down from 29-30 on the highway 18-19 city highway all the way to 22-23 highway and 12-13 city highway.
I got her tuned and now I'm back up to 26-27 and 17-18 and the car feels much more responsive. i was very lean in most areas and the PCM was adding fuel big time!!!
Get your car tuned and you should see an improvement.
Bill
""Once I get moving the car feels strong but maybe running rich. I am only getting 9 mpg in the city and 22 on the highway. I plan to scan the car tomorrow.""
When I installed my headers and mararam, my mileage dropped down from 29-30 on the highway 18-19 city highway all the way to 22-23 highway and 12-13 city highway.
I got her tuned and now I'm back up to 26-27 and 17-18 and the car feels much more responsive. i was very lean in most areas and the PCM was adding fuel big time!!!
Get your car tuned and you should see an improvement.
Bill
Former Vendor
Joined: Aug 2001
Posts: 5,798
Likes: 50
From: Dallas & Chicago TX & IL
Originally Posted by cscollis
I have been getting slower at the track each time I go. My 60's were in the 1.7X range then the 1.8X and now the 1.9X range. You can see my mods in my sig.
I am bogging off the line or blowing the tires up in smoke. If I launch from Idle the car bogs (converter doesnt seem to flash to 3800) and if I launch from 2k or higher it spins like crazy. I tried 1000-2000 launches but they are still in the 1.9 range.
Once I get moving the car feels strong but maybe running rich. I am only getting 9 mpg in the city and 22 on the highway. I plan to scan the car tomorrow.
I am also investing possible false knock. Can headers touching the subframe cause false knock. I am going to look at the knock multiplyer tomorrow also. I lost almost 3 mph from a week ago right after the engine went in. When I put a new program in from my HP tuners the car feels strong but after a day or 2 its starts feeling slugish.
I plan on getting this fixed this week because I want to drive the vette to Houston the following week.
So has anyone else gotten such crappy 60's on drag radials or such crappy gas mileage? Any suggestions would be apreciated.
BTW: I ran this last weekend:
60' = 1.82
1/8 = 7.80
mph= 91.87
Last night when it was 5 degrees cooler:
60' = 1.92
1/8 = 7.98
mph = 89.32
I am bogging off the line or blowing the tires up in smoke. If I launch from Idle the car bogs (converter doesnt seem to flash to 3800) and if I launch from 2k or higher it spins like crazy. I tried 1000-2000 launches but they are still in the 1.9 range.
Once I get moving the car feels strong but maybe running rich. I am only getting 9 mpg in the city and 22 on the highway. I plan to scan the car tomorrow.
I am also investing possible false knock. Can headers touching the subframe cause false knock. I am going to look at the knock multiplyer tomorrow also. I lost almost 3 mph from a week ago right after the engine went in. When I put a new program in from my HP tuners the car feels strong but after a day or 2 its starts feeling slugish.
I plan on getting this fixed this week because I want to drive the vette to Houston the following week.
So has anyone else gotten such crappy 60's on drag radials or such crappy gas mileage? Any suggestions would be apreciated.
BTW: I ran this last weekend:
60' = 1.82
1/8 = 7.80
mph= 91.87
Last night when it was 5 degrees cooler:
60' = 1.92
1/8 = 7.98
mph = 89.32
My suggestions, Tuning, tuning and more tuning. Figure out why your car is giving you such crappy fuel mileage, make sure all the shift points/trans line pressure are all in order. Your A/F and spark timing must be in line, check your plugs; running that fat will kill plugs and not allow them to run at their best. Also, let me tell you, dumping that much fuel can harm piston rings. Take care of the possible tuning issues first, then worry about the mechanical issues, if any. You mentioned knock, do you have an HP tuner software, Tech II or LS1 edit? If so, then you can see if you are getting knock after a recorded run. Yes, headers bumping into your block can cause goofy knock thus robbing you power.
Who is tuning your car? ah...it does not matter, just fix it. is this new motor NEW or USED?
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 996
Likes: 0
From: Frisco Texas
Originally Posted by Myhardtop
Well, I am not an expert, but I have been in the game long enough to know that it appears to me that something is wacky with your tune. Or, something is making you tune go wacky. You mentioned various things: crappy gas mileage, running fat, slower times from one track visit to the next (w/5* cooler ambient temp), converter not flashing correclty and some possible false knock!
My suggestions, Tuning, tuning and more tuning. Figure out why your car is giving you such crappy fuel mileage, make sure all the shift points/trans line pressure are all in order. Your A/F and spark timing must be in line, check your plugs; running that fat will kill plugs and not allow them to run at their best. Also, let me tell you, dumping that much fuel can harm piston rings. Take care of the possible tuning issues first, then worry about the mechanical issues, if any. You mentioned knock, do you have an HP tuner software, Tech II or LS1 edit? If so, then you can see if you are getting knock after a recorded run. Yes, headers bumping into your block can cause goofy knock thus robbing you power.
Who is tuning your car? ah...it does not matter, just fix it. is this new motor NEW or USED?
My suggestions, Tuning, tuning and more tuning. Figure out why your car is giving you such crappy fuel mileage, make sure all the shift points/trans line pressure are all in order. Your A/F and spark timing must be in line, check your plugs; running that fat will kill plugs and not allow them to run at their best. Also, let me tell you, dumping that much fuel can harm piston rings. Take care of the possible tuning issues first, then worry about the mechanical issues, if any. You mentioned knock, do you have an HP tuner software, Tech II or LS1 edit? If so, then you can see if you are getting knock after a recorded run. Yes, headers bumping into your block can cause goofy knock thus robbing you power.
Who is tuning your car? ah...it does not matter, just fix it. is this new motor NEW or USED?
Former Vendor
Joined: Aug 2001
Posts: 5,798
Likes: 50
From: Dallas & Chicago TX & IL
Originally Posted by cscollis
The bottom end has about 2K miles and the top end is new. I am taking it in on Wednesday to have them find and fix the problem. The car runs strong right after I reflash the computer but gets slower as the knock multiplier increases. I will post back after I get the issue resolved.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Mar 2002
Posts: 1,176
Likes: 0
From: highland village texas
Originally Posted by cscollis
I am taking it in on Wednesday to have them find and fix the problem. The car runs strong right after I reflash the computer but gets slower as the knock multiplier increases.
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 996
Likes: 0
From: Frisco Texas
Originally Posted by C5 CU
Scott....curious as to why Chris R. is not doing your tuning i.e. how did you end up with HP-tuner?
The tune on the new motor is by 21st and it is very conserative. The knock senors is pulling timing from something other than knock. I am taking it over to 21st tomorrow to have them check the exhaust, injectors, and anything else that could cause the knock sensor to go crazy. I plan on going to the track this weekend to test after I get this fixed.
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 996
Likes: 0
From: Frisco Texas
Originally Posted by Bill Curlee
Injestion of oil from the PCV system could be a source of the problem! Check that out. May need a catch can.
BC
BC
I did a scan today and was getting 2 degrees of knock and 16 degrees of timing at WOT.
