LT1 boost

Dmoney2SS · 07-10-2023, 08:46 PM

How much boost can a SBE lt1 withstand? And which pistons/rods would be best/ what do I need to replace to run a solid amount of boost?

Joshinator99 · 07-10-2023, 09:51 PM

Quote:

Originally Posted by Dmoney2SS

How much boost can a SBE lt1 withstand? And which pistons/rods would be best/ what do I need to replace to run a solid amount of boost?

Keep it under 10 psi and plenty of fuel (preferably E too) if you need it to live for a decent amount of time. Some guys push it further but usually not for too long…!

Pistons/rods are your choice but quality forgings are the order of the day. GPI drop-ins gets plenty of love but for good reason…they take a pounding.

adamjwilson · 07-11-2023, 06:57 AM

And if your going to open the bottom end, consider replacing the cam and DoD delete with quality lifters as well. Just like Josh said, keep the boost low (7-8PSI) if you want to live longer, but I even have seen stock aluminum pistons fail at that low boost too. Plan out your end HP goals and wallet/budget before going down this slippery slope

It is never ending

cjperformance · 07-11-2023, 07:09 AM

I think it depends on how much E you run too... and maybe the type of blower you use. I would NEVER try to do 11.5 psi on 93 octane, but so far 11.5 psi PEAK on a centri with E70+ seems "fine".

My rationale for going as high as 11.5 psi with a centri is that it only hits 11.5 psi at the very top of the rpm range, so after shift, its back down to around 8 or 9 psi and ramps back up... so if you look at average boost, its more like 10 psi average.

Compared to how i think the PD works where it'd see a solid 11.5 psi the entire time. I dont know if that reasoning is sound, or wishful thinking... my point being... the answer to your question is.... it depends

laynlo15 · 07-11-2023, 07:13 AM

I'm running about 11 to 11.5 psi pretty safely. Logs look good and we are making 707 at the wheels with Toohighpsi port injection, Maggie 2300 from SCOL on E85 (E65 in our area). I had a 16ss that we exceeded the amount of boost anyone should run on a stock Lt1, I had to pay the fiddle for that 18 psi we were running. However that motor can take a lot with good tuning, Vp race fuel and a lot of Meth/water injection. I did get 180 passes out of that motor and 12,500 miles so it can take a lot, but you'll eventually have to make a choice, lower boost for real longevity or breaking pistons cause you were drunk on drag racing and boost. Take the longevity.

KingLT1 · 07-11-2023, 09:03 AM

7psi on pump gas, 10-11psi on E50+.

WiggyB · 07-11-2023, 08:12 PM

I would say I'm tuned on the very safe side running 9.5lbs of boost on a stock block with all bolt ons.

parish8 · 07-12-2023, 06:10 PM

I have a stock 5.3 “lt” at 19psi. I think people blow their stuff up a lower boost because they run out of fuel or not enough octane. Get set up for e85 and run it rich and it will take a lot.

Chrome383Z · 07-12-2023, 09:05 PM

I’m running 10psi on E65-70ish with no problems.

laynlo15 · 07-13-2023, 06:55 AM

Quote:

Originally Posted by Dmoney2SS

How much boost can a SBE lt1 withstand? And which pistons/rods would be best/ what do I need to replace to run a solid amount of boost?

I think you have your answer, 9 to 12 psi should be safe with a good tuner. Plus you'll have your hands full with 11 psi on the street. You'll need to run a drag radial like the Nitto 555r2. King and I run the 305-35-20 555R2. They do a great job plus the wear really well with a good alignment. Go for it.

Kerry · 07-13-2023, 06:58 AM

I just got a new set 315-35-20s nitto II and their holding 2nd gear at about 820 wheel in this warm weather. Haven't tried first yet lol.

laynlo15 · 07-13-2023, 03:20 PM

Quote:

Originally Posted by Kerry

I just got a new set 315-35-20s nitto II and their holding 2nd gear at about 820 wheel in this warm weather. Haven't tried first yet lol.

I would love to have a 315 but I'm running the 9.5 SS twisted slip 20s. The 305s are almost to wide for them. Maybe someday I'll send the 20s to get them widened. I really like the looks of the wheel. I'm assuming you have an aftermarket 10 or 10.5 wheel.

Kerry · 07-13-2023, 04:52 PM

I sent mine out and got them pvd coated and widened to 11 and put 9.5s on the front. It was a night mare as they lost one. One was so bad could not balance and got 2 now that are ok. Phastec has some 11 wheels. im tempted to buy a set from them. Im old I like chrome ha

Kerry · 07-13-2023, 04:53 PM

A 305 on a 9.5 just squishes the tire till its not near as wide now. Measure before and after. Its not even worth it been their done that

07-10-2023, 08:46 PM	#1
Dmoney2SS Drives: 2022 summit white Chevy Camaro 2SS Join Date: Mar 2023 Location: Port St. Lucie, florida Posts: 65	LT1 boost How much boost can a SBE lt1 withstand? And which pistons/rods would be best/ what do I need to replace to run a solid amount of boost?

07-11-2023, 06:57 AM	#3
adamjwilson Drives: 2022 Camaro 2SS A10 Join Date: Jul 2022 Location: FL Posts: 524	And if your going to open the bottom end, consider replacing the cam and DoD delete with quality lifters as well. Just like Josh said, keep the boost low (7-8PSI) if you want to live longer, but I even have seen stock aluminum pistons fail at that low boost too. Plan out your end HP goals and wallet/budget before going down this slippery slope It is never ending __________________ 2022 Camaro 2SS/ Whipple 3.0 / 2"Headers/ PRC LTX Heads/ Forged Internals/LT4 fueling/ DSX Aux/ DSX Flex Fuel/ Meth Injection/ Katech 112 TB/ RotoFab Big Gulp/ Corsa NPP/ Various exterior mods

07-11-2023, 07:09 AM	#4
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 929	I think it depends on how much E you run too... and maybe the type of blower you use. I would NEVER try to do 11.5 psi on 93 octane, but so far 11.5 psi PEAK on a centri with E70+ seems "fine". My rationale for going as high as 11.5 psi with a centri is that it only hits 11.5 psi at the very top of the rpm range, so after shift, its back down to around 8 or 9 psi and ramps back up... so if you look at average boost, its more like 10 psi average. Compared to how i think the PD works where it'd see a solid 11.5 psi the entire time. I dont know if that reasoning is sound, or wishful thinking... my point being... the answer to your question is.... it depends __________________ 2017 50th Anniversary Edition \| P1X Stage 2 DSX Aux Low Side \| LT4 high side \| Flex Fuel TooHighPsi Port Injection (installed & tuning) CircleD 3K Stall \| QA1 CF Driveshaft Forgestar F14 Drag 17x10 NT555R2 305/45/17 Rear Forgestar F14 18x8 NT555G2 235/50/18 Front 10.84@131 w/4.13" pulley ??.??@??? w/3.7" pulley (installed & tuning)

07-11-2023, 07:13 AM	#5
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	I'm running about 11 to 11.5 psi pretty safely. Logs look good and we are making 707 at the wheels with Toohighpsi port injection, Maggie 2300 from SCOL on E85 (E65 in our area). I had a 16ss that we exceeded the amount of boost anyone should run on a stock Lt1, I had to pay the fiddle for that 18 psi we were running. However that motor can take a lot with good tuning, Vp race fuel and a lot of Meth/water injection. I did get 180 passes out of that motor and 12,500 miles so it can take a lot, but you'll eventually have to make a choice, lower boost for real longevity or breaking pistons cause you were drunk on drag racing and boost. Take the longevity. __________________ 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

07-11-2023, 09:03 AM	#6
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	7psi on pump gas, 10-11psi on E50+. __________________ 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

07-11-2023, 08:12 PM	#7
WiggyB Drives: 2022 Camaro 2SS 1LE Join Date: Nov 2021 Location: NC Posts: 275	I would say I'm tuned on the very safe side running 9.5lbs of boost on a stock block with all bolt ons. __________________ p1sc1 factory box w/ stage 2 intercooler, Lt4 fueling, JMS BAP, lt2 intake, kooks 1/78 longtube headers w/ h/f cats, alky meth kit, thpsi port injection

07-12-2023, 06:10 PM	#8
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	I have a stock 5.3 “lt” at 19psi. I think people blow their stuff up a lower boost because they run out of fuel or not enough octane. Get set up for e85 and run it rich and it will take a lot. __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472

07-12-2023, 09:05 PM	#9
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	I’m running 10psi on E65-70ish with no problems. __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.

07-13-2023, 06:58 AM	#11
Kerry Drives: 2019 2SS Camaro Join Date: Apr 2012 Location: Al Posts: 828	I just got a new set 315-35-20s nitto II and their holding 2nd gear at about 820 wheel in this warm weather. Haven't tried first yet lol.

07-13-2023, 04:52 PM	#13
Kerry Drives: 2019 2SS Camaro Join Date: Apr 2012 Location: Al Posts: 828	I sent mine out and got them pvd coated and widened to 11 and put 9.5s on the front. It was a night mare as they lost one. One was so bad could not balance and got 2 now that are ok. Phastec has some 11 wheels. im tempted to buy a set from them. Im old I like chrome ha Attached Images

07-13-2023, 04:53 PM	#14
Kerry Drives: 2019 2SS Camaro Join Date: Apr 2012 Location: Al Posts: 828	A 305 on a 9.5 just squishes the tire till its not near as wide now. Measure before and after. Its not even worth it been their done that

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