[ZR1] Horsepower of LS9 without supercharger?
04-22-2012, 02:23 AM
#1
Racer
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Horsepower of LS9 without supercharger?
Hello fellow CFers,
I'be been wondering. Since they say the LS9 is based off the LS3 block, what HP and TQ numbers do you think it would make without the supercharger and a LS3/LS7 type intake manifold in its place? How much are the heads, headers, cam etc (other ZR1 power adders) worth? May be a stupid question but I would like to know what it would be like N/A. Would it be close to the LS7? My estimates are 480hp and 460tq. I think it would be close to the LS7 but not quite based on the percentage that a supercharger gives you on top of the base motor. Any insight is appreciated! Thanks for reading!
I'be been wondering. Since they say the LS9 is based off the LS3 block, what HP and TQ numbers do you think it would make without the supercharger and a LS3/LS7 type intake manifold in its place? How much are the heads, headers, cam etc (other ZR1 power adders) worth? May be a stupid question but I would like to know what it would be like N/A. Would it be close to the LS7? My estimates are 480hp and 460tq. I think it would be close to the LS7 but not quite based on the percentage that a supercharger gives you on top of the base motor. Any insight is appreciated! Thanks for reading!
Last edited by palindrome1H; 04-22-2012 at 02:33 AM. Reason: Spelling
04-22-2012, 02:48 AM
#2
Le Mans Master
I think it would be less than a LS3 due to the low compression on the LS9. The LS7 is a high compression motor in comparison. If you are looking for reasonable comparison numbers you need to base it off the LS3 and L92 motors since those are the same displacement.
04-22-2012, 10:32 AM
#6
Le Mans Master
I would guess less than 430hp too due to the lower compression, etc. The LS9 is set-up for the blower and without it, it won't run as well as an engine that was specifically designed to be NA.
04-22-2012, 12:06 PM
#8
Burning Brakes
I'm guessing without the compression of the LS3 it will be below 430 and maybe below 400. IMO with the low compression & the SC that is what makes the car so smooth and stealthy. I think that's part of what makes the car seem more refined than the LS3 & LS7.
04-22-2012, 05:52 PM
#9
Racer
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Great input everyone! I guess I was thinking more along the lines of LS3 style compression but forgot to mention that as well. Took it for granted! You showed me I can't slip anything past you all!
04-22-2012, 08:40 PM
#10
Drifting
Guessing 350-375. Remember, it has a wide lobe separation cam (minimal overlap) specific to a blower, and not tuned for N/A exhaust scavenging like the LS3 or LS7, and is a couple points down on compression ratio, as others have noted. It's also throwing around more rotating mass due to forged components, dual plate clutch, etc. It would go from the fastest Corvette to the slowest, without a doubt.
It would, however, probably run fine on regular unleaded.
04-22-2012, 10:32 PM
#11
Le Mans Master
Hello fellow CFers,
I'be been wondering. Since they say the LS9 is based off the LS3 block, what HP and TQ numbers do you think it would make without the supercharger and a LS3/LS7 type intake manifold in its place? How much are the heads, headers, cam etc (other ZR1 power adders) worth? May be a stupid question but I would like to know what it would be like N/A. Would it be close to the LS7? My estimates are 480hp and 460tq. I think it would be close to the LS7 but not quite based on the percentage that a supercharger gives you on top of the base motor. Any insight is appreciated! Thanks for reading!
I'be been wondering. Since they say the LS9 is based off the LS3 block, what HP and TQ numbers do you think it would make without the supercharger and a LS3/LS7 type intake manifold in its place? How much are the heads, headers, cam etc (other ZR1 power adders) worth? May be a stupid question but I would like to know what it would be like N/A. Would it be close to the LS7? My estimates are 480hp and 460tq. I think it would be close to the LS7 but not quite based on the percentage that a supercharger gives you on top of the base motor. Any insight is appreciated! Thanks for reading!
a lot would also depend on intake and throttle body used.
04-22-2012, 10:47 PM
#12
Yank the blower off? LS1 power if you're lucky.
However, use that motor to build a hot, high compression road race motor? Same HP but less torque than stock.
http://www.katechengines.com/katech-...-ls9-r-engine/
However, use that motor to build a hot, high compression road race motor? Same HP but less torque than stock.
http://www.katechengines.com/katech-...-ls9-r-engine/
We are ready to release the full specs on our LS9.R endurance-focused road racing engine. This is based on production LS9 parts for increased cylinder block and head strength without going to an aftermarket block and includes a full race dry sump system. To do this with an RHS-based LS7 (if you include the Dailey system) would be nearly $40k.
The LS9.R features an LS9 block that is equipped with billet main caps and already machined for piston squirters. The block alloy is 317. LS9 cylinder heads are rotocast, have a more robust casting design, thicker deck surfaces, and 356-T6 aluminum alloy – same as the C5-R. Head studs are 12mm vs the standard LS’s 11mm. The valves are titanium 2.16 intake and hollow stainless steel sodium filled 1.59″ exhaust. The cylinder heads also feature bronze valve guides and proprietary processes in assembly that reduce valve guide wear. Cylinder heads are CNC ported in the intake and exhaust runner. The swirl-inducing fin in the intake port is eliminated for use in this naturally aspirated application.
The rotating assembly is equipped with a forged 4340 steel crank, steel H-beam connecting rods, and 13.0:1 compression ratio 2618 alloy hardcoat anodized pistons with DLC (Diamond-Like Carbon)-coated pins. The valvetrain is equipped with high speed lifters, an LS9.R-specfic camshaft, C5-R timing chain, Trend pushrods, and stock LS9 rocker arms.
The induction system is a FAST LSXR 102mm LS3 intake with Katech billet fuel rails (not pictured). The throttle body can be anything from a stock LS7, to a FAST 102mm.
The dry sump system is a Dailey 5 stage (4 scavenge, 1 pressure). The system uses a billet aluminum oil pan with four individual passages to the integrated dry sump oil pump located where the AC compressor once was. The pressure pump feeds the block via AN fitting on the side. The front cover, damper hub, sprocket, and dry sump pump gear is all manufactured by Katech to integrated the dry sump system on to the block. The front cover is anodized black. An ATI damper is used to dampen crankshaft vibrations and protect the timing chain from heavy duty road race use.
The first engine is 12.5:1 compression, but 13.0:1 compression is standard. With 12.5:1 compression we made 628hp and 551 ft-lbs.
The LS9.R features an LS9 block that is equipped with billet main caps and already machined for piston squirters. The block alloy is 317. LS9 cylinder heads are rotocast, have a more robust casting design, thicker deck surfaces, and 356-T6 aluminum alloy – same as the C5-R. Head studs are 12mm vs the standard LS’s 11mm. The valves are titanium 2.16 intake and hollow stainless steel sodium filled 1.59″ exhaust. The cylinder heads also feature bronze valve guides and proprietary processes in assembly that reduce valve guide wear. Cylinder heads are CNC ported in the intake and exhaust runner. The swirl-inducing fin in the intake port is eliminated for use in this naturally aspirated application.
The rotating assembly is equipped with a forged 4340 steel crank, steel H-beam connecting rods, and 13.0:1 compression ratio 2618 alloy hardcoat anodized pistons with DLC (Diamond-Like Carbon)-coated pins. The valvetrain is equipped with high speed lifters, an LS9.R-specfic camshaft, C5-R timing chain, Trend pushrods, and stock LS9 rocker arms.
The induction system is a FAST LSXR 102mm LS3 intake with Katech billet fuel rails (not pictured). The throttle body can be anything from a stock LS7, to a FAST 102mm.
The dry sump system is a Dailey 5 stage (4 scavenge, 1 pressure). The system uses a billet aluminum oil pan with four individual passages to the integrated dry sump oil pump located where the AC compressor once was. The pressure pump feeds the block via AN fitting on the side. The front cover, damper hub, sprocket, and dry sump pump gear is all manufactured by Katech to integrated the dry sump system on to the block. The front cover is anodized black. An ATI damper is used to dampen crankshaft vibrations and protect the timing chain from heavy duty road race use.
The first engine is 12.5:1 compression, but 13.0:1 compression is standard. With 12.5:1 compression we made 628hp and 551 ft-lbs.
04-23-2012, 07:49 AM
#13
Melting Slicks
The question is why??????????No sain person is going to remove the supercharger on their zr1 just to see what the horsepower would be if they de tuned it.This dude must be smoking something potent.You dont want the power adder, then drive an ls3.Sorry dude they dont make a six cylinder corvette just yet.
04-23-2012, 08:48 AM
#14
Racer
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The question is why??????????No sain person is going to remove the supercharger on their zr1 just to see what the horsepower would be if they de tuned it.This dude must be smoking something potent.You dont want the power adder, then drive an ls3.Sorry dude they dont make a six cylinder corvette just yet.
04-23-2012, 09:14 AM
#15
Pro
Yank the blower off? LS1 power if you're lucky.
However, use that motor to build a hot, high compression road race motor? Same HP but less torque than stock.
http://www.katechengines.com/katech-...-ls9-r-engine/
However, use that motor to build a hot, high compression road race motor? Same HP but less torque than stock.
http://www.katechengines.com/katech-...-ls9-r-engine/
04-23-2012, 09:16 AM
#16
Melting Slicks
If any of you ZR1 guys want to feel what your car would be like without the blower, all you have to do is unplug the electrical connector shown in the picture below. This will instantly remove +200 hp from your engine.
That is the solenoid for the supercharger bypass valve and if unplugged the valve will never shut. You will only build about 2 lb of boost. This is a great trick to play on your ZR1 buddies because it won't throw any codes either.
That is the solenoid for the supercharger bypass valve and if unplugged the valve will never shut. You will only build about 2 lb of boost. This is a great trick to play on your ZR1 buddies because it won't throw any codes either.
04-23-2012, 09:24 AM
#17
Burning Brakes
04-23-2012, 02:40 PM
#20
Race Director
