Somethings wrong - needs suggestions
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
The 1/8 mile was at Irwindale (13300 E Live Oak Ave Irwindale, CA 91706) on December 4, 2008 at 5:06 PM.
The 1/4 miles was at Auto Club Dragway (9300 Cherry Avenue Fontana, CA 92335) on May 2, 2009 at 2:30 PM
Here is the scan from the start of the run. No noticeable wheel spin.
The 1/4 miles was at Auto Club Dragway (9300 Cherry Avenue Fontana, CA 92335) on May 2, 2009 at 2:30 PM
Here is the scan from the start of the run. No noticeable wheel spin.
Several observations:
- If you look at the ET Fast list you’ll see that running a 13.2 with a trap speed of only 110 is not really out of line.
- The DA from Irwindale (elevation 250 ft) was 736ft whereas the DA from Auto Club (elevation 1110 ft) was 1839 so this alone cost you a little less than two tenths. If you had made that 13.213 pass but with the Irwindale DA it would have equated to a 13.038 run (which is where I came up with the 2/10ths number)
- Although it doesn’t look like you’re getting any wheelspin when you launch the car you do however seem to be losing lots of spark advance (which is the white line at the bottom that disappears from the graph briefly). This is what several people call “launch TM” but I can assure you there’s no such thing and it can be tuned out as shown below in a screenshot of one of my launches. Although my timing does still drop a little it not nearly as much as yours does.
- A dyno might give you better numbers to brag about, but the only way to tune for the track is at the track. I got my car down to 11.475 and a buddy's 08 to 11.56 without ever seeing a single minute of dyno tuning. Install a wideband, log all your runs, review your results and tweak your tune accordingly.
Hope that helps,
Christopher
Last edited by thesubfloor; May 14, 2009 at 12:04 PM.
Burning Brakes
Joined: Sep 2004
Posts: 815
Likes: 75
From: Lincoln CA
St. Jude Donor '16-'17,'19
I have a 2007 C6 automatic, 2.56 gears, K&N, polished throttle body, throttle body spacer, ported intake, ZO6 headers, cats, "H" pipe, NPP mufflers and it's been tuned.
Here are my best times:
60' = 2.193
330'=5.811
1/8th = 8.671
MPH= 86.32
1000'= 11.164
1/4 = 13.213
MPH=110.26
With just the K&N, polished throttle body, spacer, NPP mufflers and the tune, I did:
60' = 2.115
330'=5.690
1/8th = 8.527
MPH= 86.54
Adding the exhaust and porting the intake slowed me down. However, it was tuned by a very reputable tuner! The exhaust added about 28% more exhaust volume to the system and the the inlet side should be very efficient.
Any ideas guys?
Here are my best times:
60' = 2.193
330'=5.811
1/8th = 8.671
MPH= 86.32
1000'= 11.164
1/4 = 13.213
MPH=110.26
With just the K&N, polished throttle body, spacer, NPP mufflers and the tune, I did:
60' = 2.115
330'=5.690
1/8th = 8.527
MPH= 86.54
Adding the exhaust and porting the intake slowed me down. However, it was tuned by a very reputable tuner! The exhaust added about 28% more exhaust volume to the system and the the inlet side should be very efficient.
Any ideas guys?
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,215
From: Park City Utah
However he should be trapping way higer than 110.[*]The DA from Irwindale (elevation 250 ft) was 736ft whereas the DA from Auto Club (elevation 1110 ft) was 1839 so this alone cost you a little less than two tenths. If you had made that 13.213 pass but with the Irwindale DA it would have equated to a 13.038 run (which is where I came up with the 2/10ths number)
But he should still be trapping way higher than 110. Again, I trap 110 with 7000+ DA. Muffs only. If I took my car to where he's at, I'd trap 114-116 to his 110. That's not right.Although it doesn’t look like you’re getting any wheelspin when you launch the car you do however seem to be losing lots of spark advance (which is the white line at the bottom that disappears from the graph briefly). This is what several people call “launch TM” but I can assure you there’s no such thing and it can be tuned out as shown below in a screenshot of one of my launches. Although my timing does still drop a little it not nearly as much as yours does.
But think you mean lots of spark RETARD. That would only hurt the launch (from what we can see) and he should still be able to trap, way better than 110.A dyno might give you better numbers to brag about, but the only way to tune for the track is at the track. I got my car down to 11.475 and a buddy's 08 to 11.56 without ever seeing a single minute of dyno tuning. Install a wideband, log all your runs, review your results and tweak your tune accordingly.
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
I'm also curious as to whether he still has TM turned on since the scan doesn't show enough detail. That single factor alone will slow you down by up to a full tenth for each shift (I've run with it both on and off at the track).
To the OP - PM me and I'll give you my e-mail address to have you e-mail me your scan so I can take a closer look.
Christopher
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,215
From: Park City Utah
Well, I don't get it. I had a stock tune on a stock car (meaning TM still active) and still TRAPPED faster at way higher elevation and WAY higher DA.
To me, that = less hp, and his elevation + his mods should overwhelmingly = more HP than what I've got here. If it were my car, I'd have it on a dyno for some analysis.
To me, that = less hp, and his elevation + his mods should overwhelmingly = more HP than what I've got here. If it were my car, I'd have it on a dyno for some analysis.
Last edited by Tom400CFI; May 15, 2009 at 11:20 AM.
Thread Starter
Burning Brakes
Joined: Aug 2008
Posts: 802
Likes: 6
From: Oro Valley AZ
Nope, I got it right the first time. What his scan shows is a drop in timing advance, not an increase in spark retard. In HP Tuners even though they're related (i.e. an increase in knock will cause a subsequent decrease in spark advance) they're recorded separately.
I'm also curious as to whether he still has TM turned on since the scan doesn't show enough detail. That single factor alone will slow you down by up to a full tenth for each shift (I've run with it both on and off at the track).
To the OP - PM me and I'll give you my e-mail address to have you e-mail me your scan so I can take a closer look.
Christopher
I'm also curious as to whether he still has TM turned on since the scan doesn't show enough detail. That single factor alone will slow you down by up to a full tenth for each shift (I've run with it both on and off at the track).
To the OP - PM me and I'll give you my e-mail address to have you e-mail me your scan so I can take a closer look.
Christopher
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
I drag raced with the original transmission in my car from September 07 – June 08 (approximately 100 passes) before it finally let go. Since then I’ve made over 300 passes with the new one and despite an ever increasing amount of horsepower, 2 broken differentials and gradually decreasing ETs (10.908 with the LS2 and 10.644 with the LS7) it’s still hanging in there quite nicely. I’ve also got more miles on the replacement unit too (24K on this one compared to 21K with the original one).
I know full well that GM put TM in there to protect the transmission but it’s not all doom and gloom should you decide to turn off.
I just saw that you PM’d me so I’ll be sending you an e-mail shortly.
Christopher
