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Anyone have before/after dyno's going from Bullets to NPP?
So I have bullets (LS3 Base C6) thinking about switching back to npp, especially with headers going on soon. I do know that bullets are one of the few aftermarket exhausts that do simply outperform the rest based on dyno numbers (power gained). I am not looking for every last ounce of power, but I'm also not willing to lose more then 2-3 hp at the wheels by changing exhaust.
So I'd like to know if any guys switched away from bullets and have some decent comparison dyno's. Butt dynos are also acceptable. Thanks
I would think that the difference in back to back dyno runs, nevertheless different days, would more than cover any exhaust can change. If you are looking for power gains it isn't at the cans.
And 2-3 hp will be eaten up with different runs .
Ya ya I know the NNP oem number is 6 hp more for the LS3 vs the stock non NNP cans. And that is a spec'd gain vs the aftermarket cans.
Big deal 6 hp, you will not even feel it, let alone 2-3 hp loss.
Now the long tubes you will feel especially with a good tune regardless of which cans you go with.
I would think that the difference in back to back dyno runs, nevertheless different days, would more than cover any exhaust can change. If you are looking for power gains it isn't at the cans.
And 2-3 hp will be eaten up with different runs .
Ya ya I know the NNP oem number is 6 hp more for the LS3 vs the stock non NNP cans. And that is a spec'd gain vs the aftermarket cans.
Big deal 6 hp, you will not even feel it, let alone 2-3 hp loss.
Now the long tubes you will feel especially with a good tune regardless of which cans you go with.
Not looking for gains but I don't want losses. The car is already tuned and has intake and exhaust, so most likely headers and a tune will add 10-12 whp. If I lose, lets say 4whp by swapping my bullets for NPP or corsa sports (plus a weight addition), I would be netting 6-8whp from a 1600 dollar header setup.
headers are going to add more than 20 hp , it's a gain that you can feel because it is across the whole rpm band and as Boomer stated you are not going to loose anything at the mufflers going from Bullets to NPP ...
When I had LG pro series longtubes and high flow cats installed I gained 26whp and 50ftlbs torque. I think you can expect more than 6-8 ponies from longtubes.
Last edited by 2012widebody; 01-20-2017 at 08:34 PM.
When I had LG pro series longtubes and high flow cats installed I gained 26whp and 50ftlbs torque. I think you can expect more than 6-8 ponies from longtubes.
thats a gain from a stock tune though. Everything I've seen shows that if you're already tuned with intake and axleback, you're looking at a 10whp gain.
You can get 10-15 out of these motors stock with a 93 octane tune.
dont forget about the weight savings, thats more important to me that the few HP
yes. That's part of my concern. Switching out axleback and adding headers will cost roughly 2k. If I'm netting less than 10 whp and adding 30-40 pounds I'm looking at a near wash in performance while spending 2k
yes. That's part of my concern. Switching out axleback and adding headers will cost roughly 2k. If I'm netting less than 10 whp and adding 30-40 pounds I'm looking at a near wash in performance while spending 2k
For a better HP to $ ratio, go with Z06 manifolds to H-pipe $3-400 and around 12 HP.
I don't know how much your bullets weigh, but the bi-mode (NPP option) mufflers are 48# for the pair. Headers are less weight than the stock LS3 manifolds to stock mufflers, dependent on the brand and w/ or w/o cats.
BTW, if the numbers on the dyno sheet are important to you, ask the dyno operator to make one more pull, but put a hot cup of coffee next to the ambient temperature sensor first.
I ran the Z06 system too and while it does show decent gains with the hp if fails with the torque gains. Long tubs are all about torque.
Interesting you say your torque gains were a failure with the addition of the ZO6 system. Do you remember the performance torque numbers? After I changed my '08 LS3 to the Z's system, the torque #'s increased to 407 while the rear wheel power increased to 415 and 424. Now I never went to Long Tubes so I don't have those numbers to compare to.
For a better HP to $ ratio, go with Z06 manifolds to H-pipe $3-400 and around 12 HP.
I don't know how much your bullets weigh, but the bi-mode (NPP option) mufflers are 48# for the pair. Headers are less weight than the stock LS3 manifolds to stock mufflers, dependent on the brand and w/ or w/o cats.
BTW, if the numbers on the dyno sheet are important to you, ask the dyno operator to make one more pull, but put a hot cup of coffee next to the ambient temperature sensor first.
I honestly don't care about a number. I'm just trying to describe in a quantitative way, that I don't want to drop power and add weight simultaneously. Putting a number like 3-4 whp out there is really just a way to try and quantify my tolerance for real world non dyno performance loss.
Heck I'm the guy who would gladly knock 10 off of my peak power if I could magically reallocate it to my 3k RPM number.
Interesting you say your torque gains were a failure with the addition of the ZO6 system. Do you remember the performance torque numbers? After I changed my '08 LS3 to the Z's system, the torque #'s increased to 407 while the rear wheel power increased to 415 and 424. Now I never went to Long Tubes so I don't have those numbers to compare to.
manual trans? What kind of configuration were you running at the time? and was it tuned?
I honestly don't care about a number. I'm just trying to describe in a quantitative way, that I don't want to drop power and add weight simultaneously. Putting a number like 3-4 whp out there is really just a way to try and quantify my tolerance for real world non dyno performance loss.
Heck I'm the guy who would gladly knock 10 off of my peak power if I could magically reallocate it to my 3k RPM number.
The dyno power thing had a , meaning joke.
The rest was real numbers. I ran 10's with the Z06 system and other boltons. I've since switched to LG Streets and gained a bit more, but not sure how much was just the header change. The Z06 will be nearly the same weight as the base stuff.
The rest was real numbers. I ran 10's with the Z06 system and other boltons. I've since switched to LG Streets and gained a bit more, but not sure how much was just the header change. The Z06 will be nearly the same weight as the base stuff.
good feedback. Thanks. Anyone know the difference in weight between stock manifolds and long tubes?
I've really thought about that kit, I just plan on road racing the car a bit (road course), and I'm a little worried about more weight up front, along with heat management.
01-20-2017, 05:16 PM
Anyone have before/after dyno's going from Bullets to NPP?
