Realistic gains from LT's...
Originally Posted by SladeX
So I'm gonna say that they add give or take 30HP since I don't think true duals over a good 3 inch catback/muffler will yield anything more crazy than around 10HP.
I am thinking about getting headers for my car. But only 15-25 hp, man thats not that much. Not for how much headers cost for these cars. If I do it's going to be the OSX headers. Then I will need to get a LS6 manifold, then a tune, and I might as well go ahead and put the 4.10's in it if i'm getting it tuned.
Oh it never ends.
Oh it never ends.
TECH Senior Member
iTrader: (1)
Joined: Apr 2005
Posts: 8,807
Likes: 0
From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*
Originally Posted by '00_Z
I'd also say about 20 hp. If nothing else you will definately feel it pull stronger from mid-upper rpm's.
20-25HP W/O tune approx. You can see here are my gains from Stepping Up to true duals from a stock ypipe setup. Headers were already on the car and I just added Bassani TDs, (with linear Magnaflow high-flow cats), which come with a volumetric xpipe crossover. The Bassani kit has all the airflow of straight pipes. No rinky dink piece of $hit crossover in this top shelf kit. 
Originally Posted by lsx24
You can see here are my gains from Stepping Up to true duals from a stock ypipe setup. Headers were already on the car and I just added Bassani TDs, (with linear Magnaflow high-flow cats), which come with a volumetric xpipe crossover. The Bassani kit has all the airflow of straight pipes. No rinky dink piece of $hit crossover in this top shelf kit.
so it basically looks like you just gained torque... correct?
That's right. Just about 20 lb/ft, from a TDs. Later on I changed the Bassani "chambered" muffler for a dual-in dual-out dynomax stainless steel muffler from Jegs, and dynoed relatively speaking the exact same curve.
Originally Posted by lsx24
That's right. Just about 20 lb/ft, from a TDs. Later on I changed the Bassani "chambered" muffler for a dual-in dual-out dynomax stainless steel muffler from Jegs, and dynoed relatively speaking the exact same curve.
Well my buddy with a 98 Z28 A4 with just Long tubes, ORY, LID, and Pulley put down 338 to the wheels. Stock A4 puts down anywhere from 280-300 so im sure he gained at least 25 if not more to the wheels from his longtubes.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Fanatic
iTrader: (3)
Joined: Mar 2003
Posts: 1,162
Likes: 0
From: Bensalem, Pa, now montreal, Quebec
Well my last dyno was 328/338 with lid/cutout.
Then i added Ported TB, ls6 intake, longtubes,ORY, dual dual muffler and a tune and got 341/345. It was on two different dynos so i couldn't tell you how much i gained. If i gain hopefully 4mph on my trap speed, ill be happy!
Then i added Ported TB, ls6 intake, longtubes,ORY, dual dual muffler and a tune and got 341/345. It was on two different dynos so i couldn't tell you how much i gained. If i gain hopefully 4mph on my trap speed, ill be happy!
I had 312/322 with lid, magnaflow catback, descreened maf, TB bypass. Not sure if I had done the maf and TB before or after. Now have QTP's installed, new TR55's and MSD's and after they richened me up top, mine put down 331/341. I still need the Ls6, ported TB, and UDP. The cam is where it really becomes additive. I think they are all really worth 15-20 on stock bolt on cars, 25-35 with cam/bolt ons, etc. Keep in mind, we installed a Pacesetter Y and they had to cut it and weld in several places.
Huh, now you got me thinkin, I don't know why it lossed 1 hp. Actually if you ask me, there has to be a reason for it. Hopefully someone more knowledgable about airflow and velocity can chime in. I know it's not the cats, because they are high flow magnaflow converters, which should flow a heck of a lot better than the little stock converters that were originally on the car.
I put my LT's on in the winter time. It was a dramatic difference the first time I opened her up. Now Im use to it and its slow again. I did pick up 2 tenths in the quarter and approx 4-5mph.
Originally Posted by lsx24
Huh, now you got me thinkin, I don't know why it lossed 1 hp. Actually if you ask me, there has to be a reason for it. Hopefully someone more knowledgable about airflow and velocity can chime in. I know it's not the cats, because they are high flow magnaflow converters, which should flow a heck of a lot better than the little stock converters that were originally on the car.
I used the same dyno/operator. Here you can read about my conundrum:
https://ls1tech.com/forums/generation-iii-external-engine/743205-interesting-results-after-bassani-true-duals.html
https://ls1tech.com/forums/generation-iii-external-engine/743205-interesting-results-after-bassani-true-duals.html
