Is it my tune or what?

[ctrlraven]

Went to the track and "tried" to break into the 13's......didn't happen. My best to date was a 14.25 with a 60' of 2.09 minus 3500 stall converter, php intake spacer, 180 t-stat, NGK plugs (1 step colder) and Zack's control arms and out of five runs my best was a 14.40/98.68mph/60' - 2.13, my worst was a 14.59/97.16mph/60'-2.18. Temps were great high 60's/low 70's, no wind, car sat for 2 hrs at one point to cool down, felt like I had a good launch at 2500 rpm, I did nothing different from back in March with the 14.25 than I did just recently. While at the track rental for MMV I noticed a lot of bog down between 40-60mph which I figured because I might need a re-tune. After getting the new file from DR I could feel the difference right away, just overall the car runs better and stronger. But I still feel left wondering even after adjusting my shift pressure and shift mph I only went from 14.43 to a 14.40. I am extremely bummed now after spending what I did on new mods only to be running a slower ET but I am still running the same trap speed range 98.0-.9. Maybe the weather had something to do with it but I had talked with a few people who actually run slower than I do and they were spot on with their normal times they run.

The only thing I can think of is maybe the higher stall converter is only half of the solution for 13's. I do have 4.10 gears waiting to be installed so could that be the other half of what I need in conjunction with the 3500 stall to break into the 13's? Of course the most simple answer would be buy a supercharger but I have laid out the plan for my car and work from the rear forward in increasing the strength and performance, rear axle, then trans and finally engine work with the last step being force induction.

[Blackened300a]

The only thing I can think of is maybe the higher stall converter is only half of the solution for 13's. I do have 4.10 gears waiting to be installed so could that be the other half of what I need in conjunction with the 3500 stall to break into the 13's?

I had my TC lock at the begining of 3rd gear at WOT and it bogged me down, afer having it tuned out it made a huge difference.
4.10's only give you 2-3 tenths off your E/T and my corrected times are 13.6 with the same mods you have.
I think you need a re-tune, preferably on a dyno.

[offroadkarter]

Try switching tunes if you think thats it.

Maybe borrow a set of slicks just for good humor and go at it again!

[sailsmen]

Humidity is a bigger factor than temp, our cars do not run well on water.

I am confused as to the mods you have for the best times. Also look at your worst times and compare those.

Also at what RPM are your shift points?

[Pat]

Maybe what's going on is a dirty MAF element or sticky TB or some such mechanical anomoly that's telling the ECU to back it down. FWTW.

[ctrlraven]

Humidity is a bigger factor than temp, our cars do not run well on water.

I am confused as to the mods you have for the best times. Also look at your worst times and compare those.

Also at what RPM are your shift points? It wasn't humid the night I ran. The mods I had when I ran my best of 14.25 back in March were 2nd set of cats removed, JLT intake, GM-COPCs, DR tune, 255/55 kdw2 rear tires, flowmaster super 40's and res-delete tips. The mods in my sig are my current mods that I ran the 14.40 time of. I have no clue what my RPM shift points are besides it shifting at 6500rpm. I bumped up my shift mph by 3mph on the 1-2 and 2-3 shifts and noticed it pulled a lot harder passed the 1/8th mile mark since I ran one person back to back so I felt the difference.



Maybe what's going on is a dirty MAF element or sticky TB or some such mechanical anomoly that's telling the ECU to back it down. FWTW. I clean my MAFS and TB every other oil change.

[sailsmen]

A 14.2 w/ those mods is prob a record. You prob had perfect air, low temps and min humidity.

Weather is a +/- .75, w/ humidity being the biggest factor.

Compare your slowest times and see what the difference is.

Since u are launching @2,500rpm I assume traction is not an issue.

Bottom line is 14.2 w/ those mods is a super fast time, not a "normal time".

Stage II Trans, 3,000 Stall, Cobra Exhaust, 4:10, DR Tune, UD Pully

18-Mar
5:10 0.268 2.061 5.865 9.007 77.89 11.764 14.101 96.51 72* 62%
5:15 0.242 2.064 5.855 8.97 78.97 11.685 13.985 98.15
5:29 0.259 2.030 5.815 8.924 79.38 11.625 13.913 98.64
5:37 0.211 2.088 5.915 9.042 78.9 11.759 14.06 98.13
6:13 0.184 2.101 5.955 9.105 78.03 11.853 14.182 96.78
6:58 0.327 2.107 5.937 9.088 78.35 11.825 14.151 96.95
7:40 0.139 2.098 5.935 9.08 78.49 11.818 14.144 97.01

DR Dyno
5:46 0.233 2.056 5.84 8.965 78.91 11.678 13.974 98.29
5:51 0.551 2.066 5.857 8.972 79.14 11.678 13.97 98.51
5:58 0.119 2.058 5.871 8.992 79.06 11.703 14.005 97.91


31-Mar
5:30 -0.032 2.12 5.959 9.114 78.05 11.867 14.201 96.64 76* 48%
5:35 0.324 2.196 6.022 9.15 78.87 11.865 14.166 98.08
5:46 0.229 2.122 5.936 9.064 78.65 11.785 14.11 97.49
5:52 0.497 2.21 6.031 9.152 79.05 11.864 14.163 98.11
5:59 0.281 2.182 6.002 9.127 78.85 11.845 14.147 98.02
6:05 0.253 2.147 5.955 9.071 78.94 11.786 14.085 98.17
6:14 0.378 2.156 5.994 9.122 79.01 11.842 14.148 97.81
7:15 0.252 2.064 5.834 8.944 78.55 11.67 13.979 97.79 58* 75%
7:35 0.286 2.082 5.897 9.022 78.92 11.742 14.051 97.72
7:56 0.266 2.12 5.955 9.096 78.37 11.841 14.174 96.73
9:10 0.386 2.092 5.899 9.023 78.61 11.753 14.069 97.38


4-Apr
10:23 0.266 2.059 5.832 8.945 78.66 11.668 13.976 97.85 68* 78%
10:35 0.258 2.08 5.89 9.032 77.92 11.782 14.11 97.03
11:02 0.197 2.109 5.967 9.123 77.88 11.88 14.217 96.52
11:18 0.275 2.111 5.97 9.123 77.92 11.879 14.215 96.54
11:49 0.32 2.113 5.976 9.136 78.08 11.898 14.249 95.94 65* 82%
0:13 0.216 2.141 5.988 9.132 78.59 11.872 14.2 96.84


14-Apr
Todd
4:21 0.22 2.036 5.846 8.972 79.18 11.696 14.006 97.71 73* 45%
4:26 0.137 2.302 6.281 9.406 79.12 12.112 14.399 98.79 No Traction
4:31 0.322 2.162 5.933 9.025 79.63 11.717 13.998 99.06 No Traction
4:36 0.333 2.267 6.167 9.278 79.33 11.976 14.256 99.04 No Traction

Billy Diablo
4:56 0.232 2.075 5.864 8.972 78.88 11.69 13.989 98.21
5:06 0.27 2.098 5.9 9.016 78.98 11.738 14.04 98.64
5:18 0.276 2.105 5.924 9.055 78.31 11.793 14.108 97.53

Todd
5:50 0.312 2.074 5.874 8.991 79.03 11.701 13.994 98.51
5:36 0.193 2.061 5.858 8.983 78.8 11.702 14.001 98.23
6:05 0.248 2.063 5.862 8.979 79.04 11.69 13.987 98.3

Donald Diablo
6:45 0.216 2.089 5.934 9.087 78.22 11.841 14.178 96.58 66* 50%
7:18 0.208 2.118 5.982 9.137 77.9 11.9 14.241 96.43

Billy Diablo
7:49 0.144 2.162 6.013 9.152 78.85 11.88 14.195 97.44
8:28 0.236 2.124 5.973 9.11 78.91 11.837 14.153 97.38


11-Jul 95* 90%
Billy Diablo
11:54 0.196 2.114 6.019 9.214 77.16 12.002 14.365 95.28

12:02 0.16 2.113 6.021 9.225 76.94 12.023 14.395 94.98

Todd
12:58 0.324 2.114 6.022 9.224 77.35 12.001 14.365 95.17
1:06 0.112 2.148 6.076 9.281 77.4 12.054 14.41 95.57
1:11 0.233 2.121 6.021 9.207 77.79 11.969 14.315 96.09
1:15 0.068 2.091 5.994 9.191 77.44 11.966 14.322 95.57
1:39 0.205 2.116 6.044 9.252 77.27 12.036 14.398 95.35
2:05 -0.05 2.112 6.028 9.228 77.47 12.004 14.367 95.37
2:15 0.204 2.124 6.032 9.227 77.62 11.996 14.346 95.85
Danny 0.013 2.118 6.045 9.254 77.27 12.035 14.398 95.19

31-Jul
9:38 0.55 2.137 6.086 9.322 76.51 12.137 14.54 93.73 93* 98%
9:55 0.462 2.15 6.106 9.353 76.31 12.181 14.591 93.44
10:14 0.62 2.16 6.1 9.326 76.63 12.132 14.526 94.12
10:42 0.384 2.151 6.136 9.413 75.88 12.254 14.675 93.1

8/4/2004
DonaldSCT
5:23 0.255 2.14 6.137 9.385 76.39 12.21 14.618 93.67 93* 77%
5:29 -0.04 2.202 6.149 9.377 76.75 12.189 14.586 93.89
5:39 0.14 2.166 6.117 9.357 76.3 12.182 14.591 93.48
5:43 0.265 2.149 6.064 9.279 76.91 12.085 14.476 94.18
Diablo
6:21 0.050 2.137 6.024 9.218 77.47 11.986 14.34 95.63
6:30 -0.3 2.15 6.071 9.282 77.1 12.069 14.441 94.87
6:41 0.263 2.123 6.048 9.269 76.9 12.081 14.484 93.65

10/1/2004
5:20 0.222 2.12 6.023 9.231 77.2 12.03 14.416 94.36 87* 75%
5:25 0.204 2.111 5.985 9.176 77.6 11.954 14.315 95.47
5:30 0.073 2.109 6.004 9.197 77.59 11.974 14.334 95.57
6:09 0.173 2.153 6.075 9.278 77.32 12.066 14.446 94.79
7:18 .383 Rlite 2.08 5.948 9.136 77.58 11.921 14.301 94.57
7:45 0.211 2.094 5.981 9.178 77.18 11.971 14.35 94.77



11/5/2004
8:17 0.019 2.05 5.916 9.107 77.42 11.888 14.249 95.63 59* 60%
10:09 0.11 2.005 8.91 78.33 11.653 13.979 96.94
10:42 0.126 2.043 8.985 78.36 11.736 14.085 95.83
11:30 -0.049 2.024 5.851 9.011 78.19 11.766 14.111 96.24

11/26/2004
2:26 0.193 1.966 5.686 8.768 80.03 11.452 13.743 98.33 65* 60%
4:34 0.115 1.979 5.72 8.818 79.66 11.52 13.826 97.48

12/1/2004
7:26 0.16 1.961 5.71 8.806 79.64 11.508 13.808 97.91 55* 65%
7:31 0.13 1.98 5.722 8.807 80.02 11.495 13.786 98.37
8:18 0.018 2.016 5.783 8.893 79.46 11.598 13.903 97.59

1/22/2005
8:24 0.21 2.093 5.972 9.189 77.09 11.958 14.319 95.2 65* 60%
8:32 0.079 2.073 5.879 9.027 78.51 11.764 14.099 96.31
8:43 0.04 2.041 5.865 9.012 78.48 11.769 14.132 95.28
9:31 0.184 2.061 5.924 9.115 77.53 11.889 14.26 95.02
9:57 -0.019 2.064 5.906 9.07 78.13 11.826 14.192 95.11
Best 0.018 1.961 5.686 8.768 80.03 11.452 13.743 98.33
0.008

4/2/2005
2:40 0.059 2.072 5.903 9.047 78.53 11.795 14.15 95.86
3:00 0.207 2.098 5.96 9.145 77.63 11.915 14.281 95.09
3:15 0.122 2.103 5.945 9.117 77.98 11.883 14.249 95.1
5:28 0.004 2.024 5.81 8.942 78.69 11.675 14.036 92.73

4/3/2005
5:27 1.315 2.027 5.814 8.942 78.42 11.685 14.02 96.56
5:46 1.249 2.053 5.863 9.017 78.02 11.784 14.145 94.59
6:05 1.098 2.045 5.864 9.009 78.28 11.77 14.133 95.37


4/4/2005
2:25 -0.088 2.071 5.876 9.016 78.63 11.757 14.091 97.34

[Pops]

Get the 4.10s put in and you will see a lot of gain. Traction will become an issue. My GM has gone 13.56 0n street tires with 22lbs of air in them. Good luck!

[ctrlraven]

A 14.2 w/ those mods is prob a record. You prob had perfect air, low temps and min humidity.

Weather is a +/- .75, w/ humidity being the biggest factor.

Compare your slowest times and see what the difference is.

Since u are launching @2,500rpm I assume traction is not an issue.

Bottom line is 14.2 w/ those mods is a super fast time, not a "normal time".

Stage II Trans, 3,000 Stall, Cobra Exhaust, 4:10, DR Tune, UD Pully


14.2 to me was fast with the less mod setup I had, now that I have more efficient mods I would of thought of running faster, not slower lol.


Get the 4.10s put in and you will see a lot of gain. Traction will become an issue. My GM has gone 13.56 0n street tires with 22lbs of air in them. Good luck! I think its all a combination of higher stall converter needing the 4.10 gears to bring it up to the powerband faster plus I purchased JoeWalsh's drag radials from him so I am sure that will help a good bit also. I think I am going to have the shop that will be installing my 4.10 gears also dyno tune my car to see where I'm at and if I can squeeze a few more ponies out.