LS2 + Boost, compression ratio?
Thread Starter
Teching In
Joined: Nov 2015
Posts: 15
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LS2 + Boost, compression ratio? I have 2 LS2s that were pulled out of 2006 GTOs. I am putting in 2 1950 chevy pickups. The plan is to purchase the TrickFlow top end kit for the LS2. It shows that I'll be around 550hp. Also looking at a fast lsx 92mm intake. Stock 90mm throttle body and a magnuson tsv2300 supper charger. Only looking to run about 7-8 lbs of boost.
My question is this. I want to only run pump gas. 91-93 octane. Should I be changing my pistons to lower my compression? Goal is about 700hp+-.
I'm pretty set on these parts. Both of these trucks are identical trucks. Looking to get them into Sema possibly. I do not want to run meth or super high octane. What i do not know is if it will be completely necessary to change out the pistons to lower the compression.
Any help on this would be appreciated.
My question is this. I want to only run pump gas. 91-93 octane. Should I be changing my pistons to lower my compression? Goal is about 700hp+-.
I'm pretty set on these parts. Both of these trucks are identical trucks. Looking to get them into Sema possibly. I do not want to run meth or super high octane. What i do not know is if it will be completely necessary to change out the pistons to lower the compression.
Any help on this would be appreciated.
Last edited by Burly; May 6, 2017 at 11:15 PM.
TECH Resident
Joined: Apr 2010
Posts: 926
Likes: 18
From: Central Texas
I have the Edlebrock kit on my LS3 ( TSV 2300) With stock heads,cam, long tube Amer ican Racing Headers, Corsa Exhaust, Mike Norris tune it makes 540 to the ground. You are in the ball park. Mine runs 7-8 lbs boost and it has been in service over 40k miles with no issues. I run 93 octane
Lots of GTO guys run that much boost on stock short block LS2s. Unless you plan to spin the blower a lot harder you should be ok as long as the tune is done properly. I run that much with my smaller overdriven mp112 that is not nearly as efficient as a TVS and use 91 octane since that is all I have available. If you have 93 available you can keep the higher compression for better off boost throttle response, mileage and efficiency plus you can run a bit more timing. I am lowering mine to 10 to 1 with my new forged short block but I will be running 12 lbs of boost.
Thread Starter
Teching In
Joined: Nov 2015
Posts: 15
Likes: 0
Lots of GTO guys run that much boost on stock short block LS2s. Unless you plan to spin the blower a lot harder you should be ok as long as the tune is done properly. I run that much with my smaller overdriven mp112 that is not nearly as efficient as a TVS and use 91 octane since that is all I have available. If you have 93 available you can keep the higher compression for better off boost throttle response, mileage and efficiency plus you can run a bit more timing. I am lowering mine to 10 to 1 with my new forged short block but I will be running 12 lbs of boost.
I definitely want the ability to turn up boost to 12-13lbs. I understand a lot of guys are running 7 lbs on stock GTOs but what kind hp are they seeing. My goal is no less than 650 to the rear wheel. There is always a budget but this is definitely not a budget/ cheap build. I want to make sure I do this correct.
