My Car / 496whp LS3 / Cam / Bolt ons / Dyno and Pics
05-10-2013, 02:39 PM
#22
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05-18-2013, 12:21 AM
#27
Thanks for the input. Damn, I just bought a buddy's stock ZO6 exhaust for our 2012 Grand Sport and was hoping to gain 20 RWHP from that alone. I guess I'll find out how well it works on my car.
So far, I haven't had much luck. A slightly used K&N air induction kit and new spiral ported throttle body have only netted me 8 RWHP and 10 RWTQ. That was, however, without tuning as we don't want to void the warranty. Stock AFR was 11.9 to 12.0 across the RPM band and didn't change after installing the air intake and TB - done right there with car sitting on the dyno, although we "drove it" on the dyno for a while to relearn before making the "after" pull.
There's definitely power left on the table by keeping the tune stock, but first thing the dealer will do when a Corvette comes in with a powertrain warranty claim is pull up the tune and see if it's been altered.
My tuner estimated 15-20 RWHP after we swap to the ZO6 exhaust (he's done this swap several times before) again with no tuning. He's pretty confident we won't have to alter the tune since it's not that huge of a change. It's also OEM components...even if they aren't OEM to my specific car
... so they "look stock" and we are betting on a dealer not noticing if the car ever does need to go in for warranty work.
So far, I haven't had much luck. A slightly used K&N air induction kit and new spiral ported throttle body have only netted me 8 RWHP and 10 RWTQ. That was, however, without tuning as we don't want to void the warranty. Stock AFR was 11.9 to 12.0 across the RPM band and didn't change after installing the air intake and TB - done right there with car sitting on the dyno, although we "drove it" on the dyno for a while to relearn before making the "after" pull.
There's definitely power left on the table by keeping the tune stock, but first thing the dealer will do when a Corvette comes in with a powertrain warranty claim is pull up the tune and see if it's been altered.
My tuner estimated 15-20 RWHP after we swap to the ZO6 exhaust (he's done this swap several times before) again with no tuning. He's pretty confident we won't have to alter the tune since it's not that huge of a change. It's also OEM components...even if they aren't OEM to my specific car
... so they "look stock" and we are betting on a dealer not noticing if the car ever does need to go in for warranty work. Last edited by Larry; 05-18-2013 at 02:00 PM.
05-18-2013, 01:59 PM
#28
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Sorry but I told you wrong on my gains. The 409 hp was with the Z06 manifolds but with the factory Z06 cats. I gain 18 hp by gutting the cats and adding the underdrive pulley. Did not dyno prior to the Z06 manifolds/cats
Thanks for the input. Damn, I just bought a buddy's stock ZO6 exhaust for our 2012 Grand Sport and was hoping to gain 20 RWHP from that alone. I guess I'll find out how well it works on my car.
So far, I haven't had much luck. A slightly used K&N air induction kit and new spiral ported throttle body have only netted me 8 RWHP and 10 RWTQ. That was, however, without tuning as we don't want to void the warranty. Stock AFR was 11.9 to 12.0 across the RPM band and didn't change after installing the air intake and TB - done right there with car sitting on the dyno, although we "drove it" on the dyno for a while to relearn before making the "after" pull.
There's definitely power left on the table by keeping the tune stock, but first thing the dealer will do when a Corvette comes in with a powertrain warranty claim is pull up the tune and see if it's been altered.
My tuner estimated 15-20 RWHP after we swap to the ZO6 exhaust (he's done this swap several times before) again with no tuning. He's pretty confident we won't have to alter the tune since it's not that huge of a change. It's also OEM components...even if they aren't OEM to my specific car ... so they "look stock" and we are betting on a dealer not noticing if the car ever does need to go in for warranty work.
So far, I haven't had much luck. A slightly used K&N air induction kit and new spiral ported throttle body have only netted me 8 RWHP and 10 RWTQ. That was, however, without tuning as we don't want to void the warranty. Stock AFR was 11.9 to 12.0 across the RPM band and didn't change after installing the air intake and TB - done right there with car sitting on the dyno, although we "drove it" on the dyno for a while to relearn before making the "after" pull.
There's definitely power left on the table by keeping the tune stock, but first thing the dealer will do when a Corvette comes in with a powertrain warranty claim is pull up the tune and see if it's been altered.
My tuner estimated 15-20 RWHP after we swap to the ZO6 exhaust (he's done this swap several times before) again with no tuning. He's pretty confident we won't have to alter the tune since it's not that huge of a change. It's also OEM components...even if they aren't OEM to my specific car
... so they "look stock" and we are betting on a dealer not noticing if the car ever does need to go in for warranty work.
05-19-2013, 01:57 PM
#29
Objective is to gain a reasonable amount of power to make the car a little more fun but without spending a lot of money (broke after buying car ) and without voiding the warranty by changing the tune (I know, that will hold us back a lot - but voiding the warranty is not something we can afford to do right now).
05-20-2013, 06:27 AM
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Can you tell me your mod list when at 409 RWHP? We just picked up the car a 11 days ago, but I'm doing some minor mods already because stock is too slow. Objective is to gain a reasonable amount of power to make the car a little more fun but without spending a lot of money (broke after buying car ) and without voiding the warranty by changing the tune (I know, that will hold us back a lot - but voiding the warranty is not something we can afford to do right now).
Objective is to gain a reasonable amount of power to make the car a little more fun but without spending a lot of money (broke after buying car ) and without voiding the warranty by changing the tune (I know, that will hold us back a lot - but voiding the warranty is not something we can afford to do right now).
05-20-2013, 09:37 PM
#33
I don't know either. Brian is very experienced with his dyno. It's a Dynapack, so very controlled and very repeatable. My two pulls after the mods resulted in 99.8% identical HP and TQ numbers. They were not terribly impressive but normal for a stock LS3 A6 Corvette on stock tune.
He's also using the latest correction factor which is more stingy and a Dynapack typically yields lower numbers than a Dynojet. I don't care. What I like is it will really tell me any gains from future mods.
but normal for a stock LS3 A6 Corvette on stock tune. He's also using the latest correction factor which is more stingy and a Dynapack typically yields lower numbers than a Dynojet. I don't care. What I like is it will really tell me any gains from future mods.
05-22-2013, 01:19 PM
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Basic question here guys. How come I never see any LS3 cars with heads on them? Does no one make aftermarket heads for an LS3 or do they just not yield much in the form of gains?
