LS6 Boost
Thread Starter
7th Gear
Joined: Dec 2018
Posts: 7
Likes: 0
LS6 Boost
How much can you boost a stock 2002 Z06? I purchased this car with a pro charger on it. It looks like it has the stock fuel injectors. At some point the fuel system has to be upgraded. I currently see 6psi of boost. Can it handle 8 or even 10?
Melting Slicks
Joined: Mar 2006
Posts: 2,750
Likes: 377
From: South Florida FL
What he said, boost isn't a direct correlation with horsepower, but the standard answer to this is, the stock GenIII rods safe limits is around 650whp +/- 30hp, doesn't matter if it takes 5psi or 50psi to accomplish that.
Pro
Joined: Mar 2005
Posts: 722
Likes: 70
From: Fla
stock fuel pump with boostapump and 60 pound injectors made 699 hp at 11 pounds of boost in a modified stock block ls6 engine on a mustang dyno. that is fact. everybody has an opinion. Mine is fact. Take it to a reputable tuner. One that specializes on ls engines and has a long list of customers that can back up his claim as a professional tuner. dont listen to anyone. Only listen to the experienced professional tuner.
Last edited by edram454; Dec 18, 2018 at 10:54 PM. Reason: final price change
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
stock fuel pump with boostapump and 60 pound injectors made 699 hp at 11 pounds of boost in a modified stock block ls6 engine on a mustang dyno. that is fact. everybody has an opinion. Mine is fact. Take it to a reputable tuner. One that specializes on ls engines and has a long list of customers that can back up his claim as a professional tuner. dont listen to anyone. Only listen to the experienced professional tuner.
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
2017 C5 of Year Finalist
edram454 saw the words "stock" and "fuel" and it automatically triggered him to continue his quest to claim 699rwhp on a stock 190lph fuel pump with a boost-a-pump. A stock fuel pump plus boost-a-pump flows close to what a single bosch 044 would flow, i.e., 285 lph. With 285 lph supplied by the pump and 60lb/hr injectors and 11psi, I think we all know how much power this fuel system will support.
More info on dyno racing can be found here: Dyno Magic and Mythical HP
More info on dyno racing can be found here: Dyno Magic and Mythical HP
Last edited by Turbo-Geist; Dec 19, 2018 at 10:04 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
2017 C5 of Year Finalist
You said:
a: 699hp on a stock ls6 engine
b: Stock fuel pump with a boost-a-pump
It is either a or b but not a and b at the same time.
The car could make 699rwhp or the car may have only a stock fuel pump, however both of those can't exist simultaneously on the same car and be considered true.
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
well, if anything, thanks for reminding me to double-check that a new fuel pump got invoiced & added on mine... that almost got lost in the last few weeks of 'fun' we've been dealing with.
mine (stock w/ BAP) was coming up on its limits at mid-600s and 60# (really ~73# at LS rail pressures)
mine (stock w/ BAP) was coming up on its limits at mid-600s and 60# (really ~73# at LS rail pressures)
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
2017 C5 of Year Finalist
well, if anything, thanks for reminding me to double-check that a new fuel pump got invoiced & added on mine... that almost got lost in the last few weeks of 'fun' we've been dealing with.
mine (stock w/ BAP) was coming up on its limits at mid-600s and 60# (really ~73# at LS rail pressures)
mine (stock w/ BAP) was coming up on its limits at mid-600s and 60# (really ~73# at LS rail pressures)
A 255, boost-a-pump, and meth will usually get you pretty far on a stock bottom end and forced induction.
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
we settled on pulling the BAP and rewiring for, i wanna say, a 450. should leave plenty enough headroom for peace of mind.
no meth - was gonna do a direct-port setup but scratched that plan for an intercooler chiller. spraying meth before the rotors on a PD really lessens the effect & runs the risk of delaminating the lobes (reducing compression/efficiency).
no meth - was gonna do a direct-port setup but scratched that plan for an intercooler chiller. spraying meth before the rotors on a PD really lessens the effect & runs the risk of delaminating the lobes (reducing compression/efficiency).
Burning Brakes
Joined: Jan 2009
Posts: 1,218
Likes: 70
Ran out of injector on a cam only car at 435rwhp
Lost entire engine at 9psi at 611rwhp. The tune was the issue..far too hot. Car lasted 1500 miles after boost.
No doubt about it, 600+ boosted on a stock ls6 is risky. Many have gone miles and miles and many have not...including me. Listen to Turbo-Geist, Blownblue, Neutron, etc. and learn.
Lost entire engine at 9psi at 611rwhp. The tune was the issue..far too hot. Car lasted 1500 miles after boost.
No doubt about it, 600+ boosted on a stock ls6 is risky. Many have gone miles and miles and many have not...including me. Listen to Turbo-Geist, Blownblue, Neutron, etc. and learn.
Last edited by Water_Walker; Dec 20, 2018 at 11:02 PM.
Racer
Joined: Apr 2010
Posts: 311
Likes: 14
From: Eagle Pass Texas
my stock ls6 block stock 243 heads and torque v2 cam with a D1 around 11psi, 60lbs injectors, 255 pump, kb boost a pump, alkycontrol meth kit, survived for a good 3 years making about 670hp....one day I noticed alot of smoke coming out of the oil breather and I knew somthing was up...took it apart and when removing piston 7 a ring land had a fracture in two seperate locations, very small but enough for a peice to be broken off, even the cylinder walls were unharmed....so I tossed in a forged 383 i bought off a friend for cheap,it has a little more compression, so I added ls9 head gaskets, arp head studs, jam cam, a&a secondary drive and now its happy with 803hp with 16psi
Race Director
Joined: Dec 1999
Posts: 10,230
Likes: 885
From: Alexandria, Virginia, USA VA
I learned a bit about FI and hyper pistons tuning the little turbo v6 buick
on that engine they are stronger than the pistons in the ls6 which has fairly weak pistons as the rings are higher up for low emissions
you need to tune for zero detonation and certainly not lean out from lack of fuel.
I'd recommend e85 or direct port alchy injection to make sure you are getting plenty of octane and 10 psi or so and 600 should last a long time
watch timing and make sure there is no detonation anywhere on the dyno or street pulls and don't get greedy or you'll pop a piece out of the piston as have many others
good luck, the thin wall ls6 block isn't a great choice either, I have a ttix ls6 with forged internals that is "maxed out" largely due to the block.
seems right around 900 is the sweet spot and limit for the block before cyl pressure will split and crack the liners
on that engine they are stronger than the pistons in the ls6 which has fairly weak pistons as the rings are higher up for low emissions
you need to tune for zero detonation and certainly not lean out from lack of fuel.
I'd recommend e85 or direct port alchy injection to make sure you are getting plenty of octane and 10 psi or so and 600 should last a long time
watch timing and make sure there is no detonation anywhere on the dyno or street pulls and don't get greedy or you'll pop a piece out of the piston as have many others
good luck, the thin wall ls6 block isn't a great choice either, I have a ttix ls6 with forged internals that is "maxed out" largely due to the block.
seems right around 900 is the sweet spot and limit for the block before cyl pressure will split and crack the liners
