03-23-2019, 02:02 PM | #29 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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My engine builder opened mine up an additional 5 thousands if I remember correctly
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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03-23-2019, 07:39 PM | #30 |
Drives: 2015 C7 Z06 M7 Join Date: Dec 2012
Location: So-Cal
Posts: 654
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Pistons in the LTs are not weak, I've been to 800 wheel on stock LT1 bottom ends, but they won't handle mistakes well - the most common of which is lean/knock. You cannot count on a wideband to make sure you're not lean, with DI the fuel has to be injected within a certain window, if you're outside that window the fuel will still be burned and the O2 sensor will still show favorable ratio, but the actual combustion process will have occured without the fuel that the WBO2 displays. Rail pressure as well as injector pulsewidth are critical to keep an eye on, especially if you like to run at teh edge of the envelope.
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03-23-2019, 08:01 PM | #31 | |
Drives: 2017 50th Anniversary 2SS Join Date: Sep 2016
Location: Jacksonville, FL
Posts: 930
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Quote:
What Rail pressure do you think is considered safe? Like it should never drop below what numbers? |
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03-23-2019, 11:20 PM | #32 |
Drives: 2018 Audi TT RS Join Date: Jan 2014
Location: Navarre, Florida
Posts: 1,915
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There’s always outliers in every situation. I, however, cannot think of a situation where I would be willing to boost my LT1 and not put aftermarket rings and pistons in place. Modifying engines is always risky and inherently comes with potential failures. However, if I can mitigate the chances of failure by a considerable margin, you bet your ass that I will put forth the effort to do so. I have always been of the mindset that I would rather over build and under perform, than vise versa. Granted, a bad tuner could undermine all of this.
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2018 Audi TT ▊RS
2.4X 0-60, 1.6X 60', 120+mph 1/8th, 4.XX 60-130, 150+mph traps on 255/35/18 R888R tires on the street (unprepped). 2019 Audi RS3 About as fast as the TT RS 2019 Camaro ZL1 1LE Sold 2018 Camaro SS 1LE Sold 2019 Corvette Z06 Sold 2021 Charger Hellcat Redeye Widebody Sold |
03-24-2019, 07:12 AM | #33 |
Drives: 2017 50th Anniversary 2SS Join Date: Sep 2016
Location: Jacksonville, FL
Posts: 930
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Wow this thread really inspires confidence!. :( I went into boosting my LT1 thinking here we have a lot of people doing it successfully and as long as you're reasonable with the power your making and have the fuel and a good tune you can get away easily without a problem but now it sounds like the LT1 is the worst motor ever to supercharge and it's not IF but When it's going to go.
I have several pulls to redline, many WOT runs, dyno pulls, etc. Does this mean my rings are obviously not .007 because it didn't fail yet or I'm just rolling the dice over and over?
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Former Ride: 17 Camaro 2SS, M6 - Fifty | Procharger P1SC | 3.7 Pulley | Stage 2 IC | Race Bypass | DSX FF Kit | JRE Custom E85 Flex Fuel Tune | LT4 Fuel System | JMS Voltage Booster | MSD Plug Wires | American Racing 1-7/8's LT Headers Full System Catback | Baro Breakout Harness | LT4 Map Sensor | Katech Ported TB | MMS Oil Catch Can | 160 Thermo | Solo Performance J-Pipes
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03-24-2019, 08:29 AM | #34 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,787
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I seem to recall reading that the low end of the ring gap tolerance band is .009 i believe the upper end is .015. I would wager that most will fall around the midpoint. As soon as i go out to the shop, i will measure a couple of mine - as of yesterday, my motor is back in the car, sans heads. I am waiting on some custom gaskets rom Cometic bofore installing the heads. I went with the gpi piston rod combo mainly because you have to pull the motor on these cars to do a cam swap.
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Baby Blue
2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned |
03-24-2019, 09:33 AM | #35 | |
Drives: 2017 Camaro 1SS Join Date: Aug 2016
Location: NH
Posts: 1,692
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Quote:
The reason that I am stressing this ring situation is, most of the posts on the board about supercharging the LT1 have been painting a pretty rosy picture. This gives something of a sense of overconfidence. I myself bought a supercharger with that incomplete information. Now that I know the risk when using the supercharger for my purpose (long runs) would have been very high, I gave it up. We need to make our individual choices, which are best done with more information. Since Mr Jannetty is already tuning your car, then the things he discussed about reducing the heat in the rings via the tune are probably already in your tune? As far as extra steps to try reducing the heat, there would be adding water/methanol injection or straight methanol injection. Yet another would be to convert to E85. This last one for you, I think that you'd probably have to go back to a larger pulley (slow the blower down). Less boost would be because LT4 fuel parts are not very big, so I tend to doubt that they could handle E85 with the blower spinning this fast with the 3.7" pulley. You could ask JRE (your tuner) about these ideas if you want to try one of them. As previously mentioned, these types of measures could help reduce heat, but if there is a mechanical problem, they will not fix it. |
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03-24-2019, 10:05 AM | #36 | |
Drives: 2018 Camaro 1SS 1LE Join Date: Sep 2018
Location: Front Range, CO
Posts: 1,865
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That is not a piston failure, it's a tuning failure imo, or just what we get with modern engines and not a ton of experience with DI depending on your perspective.
Those rings got blown out by MASSIVE overpressure in the cylinder due to "super knock". |
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03-24-2019, 10:18 AM | #37 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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Its all about Fueling and Tuning, don't loose confidence just go slowly towards your goal, don't get greedy as I did.
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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03-24-2019, 10:28 AM | #38 | |
Drives: 2018 Camaro 1SS 1LE Join Date: Sep 2018
Location: Front Range, CO
Posts: 1,865
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Quote:
As a Magnuson employee I'm not sure it's in your best interest to share exactly what you know, but it would be a lot more helpful than telling people to "Just do it right!" IMO... unless you love working on cars just buy a ZL1. There are many advantages besides a warranty, the car's traction and stability control systems are actually tuned for the amount of power it makes, something you'll never get modifying a SS. And resale value... |
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03-24-2019, 11:13 AM | #39 |
Drives: 2017 SS 1LE, 2017 Volt, 2013 Pilot Join Date: May 2014
Location: Colorado
Posts: 4,274
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I'm running 9 psi, 620 to wheels, but that's adjusted to the 6000 feet i'm at. The tuner i used has tons of LT1 experience and i do know he pulled some timing.
I've considered drop in pistons, not sure about rods but would probably do them too, but i figure it would be 5 to 6 grand. Is it necessary to pull the motor or can they do it on a lift? I also have a lack of trust issue, i'd love to have one of the member shops here on the forum do it, but they are all out of state.
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2017 SS 1LE | HBM | Vortech V3-Si supercharger (620RWHP and 575ft lbs) | PDR | Black Bowties | Illuminated Front Black Bowtie | Illuminated Door Sills | Smoked Tails | vented seats mod
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03-24-2019, 05:32 PM | #40 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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Timing isn't necessarily the issue. Rail pressure and Injector MS is CRITCAL!! You can still burn a piston up with low timing if the Injector MS gets above 6.5-6.7 and the Rail pressure drops. These engines love timing, but they don't like to be starved of fuel...and maintaining proper injection timing is critical.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
03-24-2019, 09:36 PM | #41 | |
Drives: 2017 Camaro 2SS Nightfall Gray vert Join Date: Jan 2018
Location: Swansea, IL
Posts: 1,219
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Quote:
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2017 Camaro 2SS vert - Nightfall Gray
Magnuson Heartbeat SC - Tuned by JRE Racing 776whp/745wtq (12psi) 2018 Corvette Z06 vert- Black To be tuned by JRE Racing TBD performance |
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03-24-2019, 09:49 PM | #42 | |
Drives: 2017 Camaro 2SS Nightfall Gray vert Join Date: Jan 2018
Location: Swansea, IL
Posts: 1,219
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Quote:
In fairness, I have decided to dial my Camaro back down to the original Super Street Brawler Package - 8psi @ 715whp until I get different tires. Then I will re-evaluate my setup and consider adding more boost. As I see it, a street car with 800bhp is pretty sick.
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2017 Camaro 2SS vert - Nightfall Gray
Magnuson Heartbeat SC - Tuned by JRE Racing 776whp/745wtq (12psi) 2018 Corvette Z06 vert- Black To be tuned by JRE Racing TBD performance |
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