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Max boost with stock internals - LS7 ?

 
Old 07-08-2019, 03:32 PM
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renegade123
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Default Max boost with stock internals - LS7 ?

What is the general consensus on the " safest " amount of boost on an LS7 with stock internals ( besides upgraded cam and supporting valve components ) . How much can these basically stock motors take before you have to start added forged pistons, rods etc. ?? This is NOT for the strip or track , but to be driven fairly aggressively when the need arises
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Old 07-08-2019, 04:07 PM
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Unreal
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Boost is irrelavant. ~700-750rwhp.
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Old 07-08-2019, 08:35 PM
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Originally Posted by Unreal View Post
Boost is irrelavant. ~700-750rwhp.
Like unreal said 7-750 is safe some push as far as 8-850. How long it will live there is unknown. Iíve seen heads/cam ls7 pop pistons from **** tunes. It all about the tune and the hardware. Donít cheap out anywhere. Iím shoving my D1sc fed ls7 woth 25gph 100%meth. With 6psi and only 10 degrees of timing we stopped at 711whp and 635tq.
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Old 07-10-2019, 12:09 PM
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How long are you wanting it to last? Fuel and tune will be the biggest dictators. I've seen someone, local, push a little over 900whp through the stock bottom end and it was beat on pretty regularly for a while. Car was sold. Don't know if it's still running as it was.

700-800 if you want it to last a while
800-900 if you are building a replacement SB
900+ if you're wild
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Old 07-11-2019, 12:54 PM
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Fran from rpm Motorsports did a centrifugal with meth and pump gas 800whp SBE
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Old 07-11-2019, 12:56 PM
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Yah, and other people have done 900+. One offs shouldn't be taken as the norm. Can a car make 800rwhp on a dyno, sure. Will it live there a long time when raced and beat on, maybe, maybe not. 800rwhp is pushing it.
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Old 07-11-2019, 01:02 PM
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Originally Posted by Unreal View Post
Yah, and other people have done 900+. One offs shouldn't be taken as the norm. Can a car make 800rwhp on a dyno, sure. Will it live there a long time when raced and beat on, maybe, maybe not. 800rwhp is pushing it.
True. Of course... heís been on it for 10k miles at 800whp+ but itís Fran heís a tuning guru!
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Old 07-11-2019, 01:14 PM
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@73DBG has been at 840whp for a while and he doesnít baby the car at all. Tune is absolutely the most important modification.
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Old 07-11-2019, 01:17 PM
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He also has a forged piston plus he stinks at shifting

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Old 07-11-2019, 01:22 PM
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If you think 10k is acceptable awesome. For a lot of people they want 30k-50k out of a motor. Either way, 800 is pushing it and take it at your own risk and be ready to rebuild it for any little hiccup.

Tuning WOT isn't magic. Yes Fran rocks, but tuning WOT max power isn't hard and most people can do that with ease.
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Old 07-11-2019, 01:30 PM
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What the hard part drivability? WoT is what we have to worry about when stuff can pop the motor I assume correct?
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Old 07-11-2019, 01:31 PM
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Yah, idle, part throttle, driveability. WOT is just set AFR and timing, done. The only differences is how aggressive you get. Now this assumes you don't have a complete idiot behind the keyboard.

Big part of what makes people like Fran great is he knows what works, what parts to use, what setups to run. What cam, what headers, what blower setup with what pullies, what meth system, what fuel system, etc. So there is more to it than just the person behind a keyboard. His setups work great because they are complete proven packages.

Last edited by Unreal; 07-11-2019 at 01:41 PM.
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Old 07-11-2019, 02:47 PM
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Originally Posted by GX427 View Post
He also has a forged piston plus he stinks at shifting
I forgot he put racetec pistons, I reject my previous post lmao
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Old 07-13-2019, 02:00 PM
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A good tune, good fuel, and keeping timing in check at peak torque is the key to keeping SBE stuff together.
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Old 07-14-2019, 09:00 PM
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Originally Posted by HouseS2k View Post
Like unreal said 7-750 is safe some push as far as 8-850. How long it will live there is unknown. Iíve seen heads/cam ls7 pop pistons from **** tunes. It all about the tune and the hardware. Donít cheap out anywhere. Iím shoving my D1sc fed ls7 woth 25gph 100%meth. With 6psi and only 10 degrees of timing we stopped at 711whp and 635tq.
Originally Posted by HouseS2k View Post
@73DBG has been at 840whp for a while and he doesnít baby the car at all. Tune is absolutely the most important modification.
True.... but Iím not SBE, I did do a complete bottom end refresh and have forged pistons and hellfire rings, a very good machine shop with very high attention to detail did all the assembly, triple measure of push rods, sent two sets back, rechecked all of AHPís measurements because he said he didnít give a **** who built the heads itís not going together until he remeasures everything(Kholeís stuff was on point though) I do have a good tuner who isnít full of himself, meth and rev limiters until I had the fuel system for corn....Iím out of town but I left my car at the shop since the dyno was down when we put the fuel system on....stand by for new numbers with ethanol.

Iíd probably say my car isnít one to use as an ďaverageĒ either itís a 2006 with under 20k miles around 3k on the rebuild but yeah sheís holding pretty good and when I do drive it I give it hell....or it gives other people hell lol 😂

Boosted LS7 is a gamble regardless I believe and usually the type of dude that thinks....Ēyou know what this LS7 needs....a little boost....thatíll really wake it up...Ē thatís a risk taker and weíre kinda a different breed in general, just thought Iíd throw that PSA out for any ďregularĒ type broís who stumble across this thread. 🇺🇸
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Old 07-14-2019, 09:04 PM
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Originally Posted by GX427 View Post
He also has a forged piston plus he stinks at shifting
Hey buddy!!! Iím a work in progress lol, itís amazing I didnít end the car or die during my ďnew guyĒ phase lol

shifts are getting a little better by the way ******!
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