viking396

What are you shifting at? Honestly, I think it's my tune, when I first installed the CAI and 93 tune it pulled hard up until 6300 now that I've given it a night of thought. Union Grove has test and tune night this Tuesday. I may re-tune tomorrow night and then Tuesday (if it isn't raining again) I'm going to go up there and give it the 'ol college try.

viking396

I would have been happy with a 13.5@103 or 104, I've spoken with a few people who claim many people were off a few tenths because the air was pretty bad that day but I'll be darned if the air didn't seeem pretty good. The barometer was around 29.9, obviously 30 or better would have been optimal but 29.9 isn't that bad.

Shifting it at 5800 gave me the worst result, I think the re-tune and higher shift points should work.

Hey guys, you hanging third to almost the end or all the way? I nail 4th very close to the end of the 1/4 simply because it feels like it needs it... The launch isn't that bad at around 2200-rpm's which has gotten me 2.1 60foots.

viking396

I've raced this track a long time, it's a hard track to explain as it looks like it's not. However if a mag says a car runs 15.0 like they said my '85 5.0 LX coupe would run and I got a 14.7 out of it I can generally beat what I see magazines running and some magazines have claimed mid 13's for these cars so I figured my luck would continue, looks like I'm going to be eating crow on that one.

Hmmmm I wonder if those cars had the 17 inchers which would help a bit... Union Grove will help me determine what I do next, I'd really like to get a 13.5 or 13.6 out of it solid at 103 mph... maybe I'm expecting too much.

I've given thought of reinstalling the stock air box and tune and base lining the car on Tuesday as well then reinstall the Tunable Induction CAI and 93 tune to see the difference.

viking396

Am I just seeing too many people claiming to run mid 13's on just a CAI and Tune, can they all be lying? The Tunable Induction CAI is supposed to add a pinch over 20rwhp which should help but the damn magazines have claimed mid 13's in stock form..... ahh well.

Fly

There's where your ET is going. With a 93 tune, I would think you could take each gear to 6500. I go through the traps at 6500 in 3rd gear running stock 18" wheels and tires and I'm only running a 91 octane tune. I think if you stretched it to 6500 before you shift, you'd see a dramatic decrease in ET.

viking396

Re-tuning a car doesn't suddenly give the heads the ability to make power at 6500 rpm, they don't suddenly have the ability to make that much power 700 rpms higher than they could stock. A cold air induction and tune make changes to the computer to allow for more air coming into the engine and it also makes changes to the timing (simply speaking of course) but it in no way gives the engine the magic ability to make power at 6500rpms.

You shift where the car makes power too, not higher and not lower unless you want to slow down. On the very last run I held out 3rd gear and my mph suffered as did ET, hanging it out further isn't going to give me 3 tenths and more mph.

Now, if someone with experience with these engines could chime in (hint Chevykiller) he can explain that if you're shifting at what you think is 6500 then your tach is off, hell maybe mine is but I think what I say is valid, an engine stock making optimal power at 5800rpms isn't going to suddenly have the ability to make power 700rpms higher without modifications to the heads.

Maybe I'm wrong but I don't think so...

Fly

OK, keep shifting into 4th and I'll refrain from trying to help you. You asked a question, I tried to help. BTW, ask your tuner what VCT means.

viking396

Ok, I have gone to the Great Lakes Dragaway web page to use their calculators and per the calc my car with me in it weighs 3773lbs (3450, + 273 + 25lbs gas) (yes, I'm a fat SOB, what can I say) and with that weight and a trap speed of 102 from yesterday I'm putting down 313hp Union Grove Dragaway Calculator Page Link

The first calculator is supposedly the most accurate but of course this isn't gospel...

Here are my runs per the timeslips:

Run 1 all shifts at 6k
Launch 2400rpms spun 1st gear a bit

60ft = 2.242
330 = 5.961
1/8 = 9.032
MPH = 80.26
1000 = 11.657
1/4 = 13.863
MPH = 102.12

Run 2 all shifts at 6k
Launch 2400rpms felt strong less spin

60ft = 2.167
330 = 5.930
1/8 = 9.018
MPH = 79.81
1000 = 11.662
1/4 = 13.884
MPH = 101.35

Run 3 all shifts but 3rd to 4th at 6k, 3rd to 4th per my notes was at 5900
Launch 2400rpms felt strong less spin

60ft = 2.159
330 = 5.931
1/8 = 9.040
MPH = 79.43
1000 = 11.687
1/4 = 13.919
MPH = 101.01

My goal is to go to Union Grove on Tuesday as I've mentioned and re-tune it Then I'll try to wing it above 6k, if it feels strong I'll hold it to 6300 and see how it runs.
Chevykiller, if you're reading this chime in on the shift points mentioned by some people.......

viking396

I'm not trying to be rude here but I don't need to ask my tuner about VCT on the new engine used in the '05/'06, I know what it is and still don't feel that these heads have that much room going from stock to a CAI and tune but that doesn't mean I claim to be right. I know how MY car felt yesterday and it sure didn't feel like it could handle 6500 rpm shift points. If you feel it does then explain why so others including myself can learn from your experience, but don't expect me to shift at 6500 without some very good explanation as to why.

Fly

These heads will make power at 6500 rpm without being worked, period. Mine does, as does another person that has posted on this thread. But I will suggest that it is a possibility that your tune might be a little lean (13 or higher) and that the processor might be pulling some timing resulting in your power flattening out. I would recommend checking your A/F ratio before trying the 6500 rpm shift point.