Realistic gains from LT's...
#21
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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.
#22
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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.
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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.
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#24
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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.
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#25
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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.
![](http://ubfm.net/ta/dyno/ProDyno2a.jpg)
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
![](http://ubfm.net/ta/dyno/ProDyno2a.jpg)
so it basically looks like you just gained torque... correct?
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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.
#27
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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.
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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.
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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!
#30
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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.
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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.
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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.
#33
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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.
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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