07-03-2017, 05:48 PM | #43 |
Drives: Black SS 1LE Join Date: Mar 2017
Location: South Carolina
Posts: 63
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I bet you tires went SKRTTTTTT
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07-03-2017, 06:03 PM | #44 |
Drives: Big Brown Join Date: Dec 2016
Location: USA
Posts: 79
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If the plan is to continue modding then none of this matters...
Not to be flippant, but if you can afford to buy a brand new ZL1 knowing you are going to mod it, and sacrifice the warranty, AND resale value, then why do you care about a missed shift? If anything have the valve train checked...most likely its ok, but hard to say for sure... But in the mean time rest easy...new LT4 crate engines are available...if this one blows, buy another engine and slap it in and go... Either way, you are good to go... |
07-03-2017, 06:14 PM | #45 |
Z Bowman
Drives: 2010 2SS (SOLD), 2016 2SS, 2007 Z71 Join Date: Aug 2011
Location: Kentucky
Posts: 222
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So I missed 4th a week ago smacked it in 2nd. It slung both belts off the car. But car is driving fine now.
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2016 2SS M6 Bo White Ported MSD, Bo White Ported TB, Flex Fuel Kit, Drag Pack, Rotofab, Ryan Stevens GPI tune, 15” conversion
Fastest Bolt On N/A M6 Record Holder 11.268 @ 120.268 2010 2SS/RS A6 (sold)Mods: Borla Atak Catback, Stainless Power 1 7/8 Headers, TSP VVT-3 Cam, 3200 Yank Stall, CAI Inake, Ported TB, 18" MT ET STREETS |
07-03-2017, 06:18 PM | #46 |
Drives: Slow Join Date: Mar 2016
Location: Baton Rouge
Posts: 669
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I care about the missed shift bc I'm just curious as to what safeguards are in place to minimize damage from missing a downshift. But If I do blow this one I wouldn't buy a crate motor, I'd build this one if possible
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2016 Toyota 4Runner
2017 Camaro ZL1 |
07-03-2017, 07:05 PM | #47 | |
Drives: 2017 ZL1 Join Date: May 2012
Location: Las Vegas
Posts: 16
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Quote:
With that being said...most all failures due to this type of misshift happen almost immediately, not days or weeks later, usually it’s kaboom and fast. How many RPM’s were you going while in 6th before the miss shift to 2nd? The reason I ask is that a downshift from high rpm to high rpm is MUCH worse than a downshift from a low RPM to a high one. |
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07-03-2017, 07:18 PM | #48 |
Drives: Pre-production ZL1 M6 Join Date: Feb 2016
Location: Sunbelt
Posts: 531
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Then study this video and adopt its teachings. Never will happen again!
https://youtu.be/ujTeX-LYmuo |
07-03-2017, 09:45 PM | #49 | |
Drives: Slow Join Date: Mar 2016
Location: Baton Rouge
Posts: 669
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Quote:
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2016 Toyota 4Runner
2017 Camaro ZL1 |
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07-03-2017, 11:40 PM | #50 |
Drives: 2017 ZL1 Join Date: May 2012
Location: Las Vegas
Posts: 16
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That sounds like you are ok...that red blinking was a shift light...keep us up to date but it seems ok. I have a friend that went from 6th to 2nd , 6th at about 1800 to 2nd for about as long as you did. Got his car dyno’d.... no sign of valve float 550 rwhp 556 tq 91 octane gas at 2200 ft above sea level. He was relieved lol. He’s over 2k miles now (was 800 when he over revved) and not a burp. Was a Corvette but supercharged same stuff...
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07-04-2017, 05:17 AM | #51 | |
Drives: Big Brown Join Date: Dec 2016
Location: USA
Posts: 79
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Quote:
To take it further, it would be nice if there was a way to build in some kind of safe guard into the shift mechanism on downshifts...if GM can engineer the 1-skip 2nd to 4th on acceleration...then seems plausible they could design something to eliminate over-revving on the way down... This down shift limiter could be designed to allow the car to be fully tracked within its maximum performance design envelope without losing any time on the track. The manual purists will probably hate this and say it defeats the purpose of a manual. Happy 4th! |
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07-04-2017, 06:39 AM | #52 |
Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 4,978
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07-04-2017, 09:28 AM | #53 | |
Drives: Slow Join Date: Mar 2016
Location: Baton Rouge
Posts: 669
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Quote:
Happy 4th to you as well That's the same question I asked in here as well. These manuals have reverse lockout so you don't accidentally grab reverse while going forward, automatic rev matching, 1-4 cags, no lift shift, and even hill start assist!!! But they draw the line at a speed related gear lockout to elminate an accidental misshift??? I think if the manual purist wants to stomp their feet about anything on the manuals, they've got a few other reasons
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2016 Toyota 4Runner
2017 Camaro ZL1 |
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07-04-2017, 10:18 AM | #54 | |
Resident Disciple
Drives: 2010 CTS-V 6MN '98 Camaro SS (Sold) Join Date: Dec 2007
Location: Roches Point, Ontario, Canada
Posts: 607
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Quote:
Once upon a time, I went 3-2 (at redline in 3rd) on the dragstrip in 98 SS stock LS1. The car stopped dead in its tracks almost throwing me through the windshield! I finally got it started again and managed to drive home with the car bucking like crazy and raw gas dripping out the exhaust pipes. I think all the pushrods were bent and there were definitely some smacked valves. The engine was rebuilt at the dealer and I subsequently found out that they had done the rebuild USING THE ORIGINAL VALVE SPRINGS, which unbeknownst to me at the time, had been seriously weakened by the incident, This caused more grief later on with more bent pushrods when the engine spike to only 4500 rpm. I had the springs tested independently and there were a lot of springs measuring in the 40 lb.- 55 lb. pressure range where the stock pressure was supposed to be 70 lbs. The engine ran just fine after the rebuild until that quick spike to 4500 rpm when I was getting used to rev matching after installing 4.10 gears from the stock 3.42s. Best regards, Elie
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2010 Cadillac CTS-V 6MN Thunder Gray
1998 Camaro SS # C079 SOLD |
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07-04-2017, 10:44 AM | #55 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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Quote:
That said, I did this myself once on a supercharged LS1. Went from 3rd up at 6000 rpm, into 2nd. Thankfully, I felt the abnormal sensation as I was releasing the clutch pedal, and quickly pushed it back in. I wasn't watching the tach, but the whole car jumped sideways. So I'm guessing the revs shot up momentarily. This engine had a cam with aftermarket dual valve springs, titanium retainers, and chromoly pushrods. No damage occurred, and it was fine until I sold it a few years later. Can't say it would have been the same with a stock valvetrain. I guess I'll never know. |
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07-04-2017, 01:24 PM | #56 | |
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,809
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Quote:
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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