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Old 09-05-2017, 08:50 AM   #1
MDSheds_SS
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Inconsistent 1/4 times

Anyone else have these issues. My MPH is all over the place as are my time slips. Weather and wind I'm sure my play a small factor.
Mph has been from 124 to 111
ET has been from 11.7 to 11.1
With the same 1.50/1.48 60'
Nothing has been adjusted in the tune and I haven't logged it yet. Going to do so next time at the track.
Same amount of tire pressure and same weight in the car every time. I'm sure logging will tell the tale of what's happening but has anyone else had issues like this? Feel as if this car should be much faster then it is.
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2012 2500hd Silverado with LTZ 20s
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Old 09-05-2017, 09:25 AM   #2
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Those are some big swings. Is there any trend to the data (consistently slower overall or faster?)
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Old 09-05-2017, 09:38 AM   #3
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I wonder what that converter is doing
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and once i get PHB, what do i ajust it too?
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Seven.
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Old 09-05-2017, 09:49 AM   #4
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We are also wondering about the converter.
The only trend is that it gets faster every run. My best run was after making 7 or 8 runs at a track rental. Since I've been driving the car to the track and not trailering it I've seen it start off running higher 11s.
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Tuned by Tune Time
08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
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Old 09-05-2017, 09:56 AM   #5
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Are your floor mats stuck under the pedal?
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Old 09-05-2017, 10:07 AM   #6
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Are your floor mats stuck under the pedal?
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and once i get PHB, what do i ajust it too?
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Seven.
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Old 09-05-2017, 10:21 AM   #7
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Bro.... we all know floor matts are part of the stage 1 weight reduction kit. Lol. ****, I even cut the carpet away from the petal to assure WOT
Tossing the floor mats and dropping the back seat down is good for a few tenths
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Tuned by Tune Time
08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
02 GMC Quadrasteer Denali

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Old 09-05-2017, 11:32 AM   #8
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I think your heads are the issue. Id be willing to swap my stock 243s to help you out.
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Old 09-05-2017, 11:36 AM   #9
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I think your heads are the issue. Id be willing to swap my stock 243s to help you out.
Fastest pass so far is with my old 243s.
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08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
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Old 09-05-2017, 11:42 AM   #10
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I see you said nothing was adjusted in the tune... does that mean you havent had it tuned since the trick flows went on ?
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Old 09-05-2017, 12:00 PM   #11
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It's was retuned after the new heads, but hasn't been logged or touched since. The inconsistency is what has me puzzled. Hoping once I get a chance to read what the car is actually doing I can take a step in the right direction.
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Tuned by Tune Time
08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
02 GMC Quadrasteer Denali
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Old 09-05-2017, 12:50 PM   #12
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Was going to say maybe the tire is spinning on the rim, but your 60s are the same.

Is it shifting into high gear to early?
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Old 09-05-2017, 05:32 PM   #13
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Are you saying the car has consistently slowed down or its fast one pass, slow another? What changes have been made between the varying times?
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I know it's good to eat salads, but this is ridiculous.
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Old 09-05-2017, 06:34 PM   #14
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Zero changes between all of these runs. most on cooler nights, no warmer then 70 degrees. 60's are almost identical every time.
It's will go 11.45 11.3x 11.2 all in the same night. In that order.
Other times like last weds. Was 11.55 11.50 11.42. Faster every run but the starting points are all over the place. Waiting for it to go 11.2 11.1 10.99 but hasn't happened. Best pass with the new heads and most recent tune is 11.17
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Tuned by Tune Time
08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
02 GMC Quadrasteer Denali

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Old 09-05-2017, 07:41 PM   #15
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definitely weird man
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Old 09-05-2017, 08:16 PM   #16
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Quote:
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Zero changes between all of these runs. most on cooler nights, no warmer then 70 degrees. 60's are almost identical every time.
It's will go 11.45 11.3x 11.2 all in the same night. In that order.
Other times like last weds. Was 11.55 11.50 11.42. Faster every run but the starting points are all over the place. Waiting for it to go 11.2 11.1 10.99 but hasn't happened. Best pass with the new heads and most recent tune is 11.17
Those numbers are not that inconsistent. Looks like the air is getting cooler as it gets later into the night so its making more power
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Old 09-06-2017, 07:52 AM   #17
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Probably a good idea to check the da on dragtimes.com but might attribute some to warming of fluids as well if its trailered.
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hi there, i just joined this forum and i must admit that i like it
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I know it's good to eat salads, but this is ridiculous.
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Old 10-05-2017, 06:45 PM   #18
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Car is still slow but it 60s' good.
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Tuned by Tune Time
08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
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Old 10-06-2017, 08:52 AM   #19
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Be faster with a radial

But won't look as gangster
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hi there, i just joined this forum and i must admit that i like it
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I know it's good to eat salads, but this is ridiculous.
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Old 10-06-2017, 08:58 AM   #20
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Great pic! Is that a **** eating grin I see?
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Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.6 @ 140 (10.40 @ 133 w/ Dad mod)

17 C7Z - 11.05 @ 124.5
17 Sierra 2500HD Dmax
81 Turbo TA
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Old 10-06-2017, 09:28 AM   #21
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Be faster with a radial

But won't look as gangster
Those are MT radial pros
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Tuned by Tune Time
08 Escalade 24" OEM Replica Wheels. Stock 6.2 for now.
2012 2500hd Silverado with LTZ 20s
86 Buick GN Lesabre 1 of 117
02 GMC Quadrasteer Denali
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Old 10-06-2017, 10:33 AM   #22
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hi there, i just joined this forum and i must admit that i like it
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I know it's good to eat salads, but this is ridiculous.
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Old 10-06-2017, 07:15 PM   #23
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Be faster with a radial

But won't look as gangster
what tire did you think it is? a slick ?
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Old 10-06-2017, 07:26 PM   #24
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Cars pulling timing, gotta get the the water temp consistent between runs. Its hard to do
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Old 10-06-2017, 09:31 PM   #25
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sweet pic! Whats your race weight?
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