LS1 to LS6 intake
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,320
Likes: 242
From: NW Chicago
St. Jude Donor '12-'13-'14-'15
LS1 to LS6 intake
If I swap out a ls1 intake with 24lbs injectors to a ls6 intake with 28 lbs injectors, will I need a tune or a computer adjustment? Also is there a difference, performance wise, with the newer by wire throttle body on the newer ls6 manifold than the one that was on the ls1 (99) manifold ? I know if I use the newer throttle body I will need the by-wire adapter and the coolant tubes and plugs for the manifold swap. Thanks
Melting Slicks
Joined: Oct 2007
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From: It's true money can't buy happiness, but it is more comfortable crying in a Corvette than on a bicyc
St. Jude Donor '13
i disagree. yes a tune would make use of the bigger injectors but the car will run fine without a tune. how can i be so sure? i drive the snot out of my 99 with the same setup you are proposing.
Melting Slicks
Joined: Sep 2006
Posts: 2,041
Likes: 4
From: Rockford Illinois
You can drive the car without tuning it with larger injectors, but you will waste more fuel, run more rich. If you get a tune, that will will be addressed and the A/F ratio will leveled out.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
I also ran the same setup on a 99 with a ported throttle body without a tune and it was fine, no problems. I later got a tune and it was much better but no real problems without it.
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Burning Brakes
Joined: Jan 2007
Posts: 833
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From: Boca FL
Yep, you don't need the extra fuel unless you're doing more. Stick with the 26# now and install the 28# when you do a cam.
Melting Slicks
Joined: Oct 2007
Posts: 2,798
Likes: 8
From: It's true money can't buy happiness, but it is more comfortable crying in a Corvette than on a bicyc
St. Jude Donor '13
The 26# injectors will run near the max duty cycle, the 28# will run with reserve, or more room for later improvements. There is a informative post somewhere around here with the data. The computer will learn the new air flow fairly quick. In my case I saw a small improvement in fuel economy and it doesn't run rich. My Ti exhaust tips are clean on the inside with no sign of wetness like my Jeep with no cats and bigger Ford injectors. As far as a improvement in performance, it was minor. I did the swap as part of the foundation for where I'm heading in the end. Next weekend will be the LT Headers, cats, and x pipe. Later in the spring I hope to do the heads and cam. At that point I will dyno tune. I hope by then I'm done, but you never know.
Drifting
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From: Holly, Michigan
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Last edited by Gideon's_Test; Feb 5, 2010 at 02:02 PM.
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,320
Likes: 242
From: NW Chicago
St. Jude Donor '12-'13-'14-'15
Guys, thanks for the responses. I should have been clearer on my engine. It is a 372 stroker with cnc'd ls1 heads and forged bottom. In 99 there was'nt a better manifold than the ls1. I was going to swap to the ls6 manifold for now and get a set of headers in the future. I would love the fast intake but can't justify the cost at the moment. I want to hold off on a tune until I get the headers. By the sound of things I should be able to go with the 28 lbs injectors since the engine is modified, it also has a mild cam. According to the builder it has about 435 hp at the crank when built in 99. I never had it dynoed and I am considering to get one for a basline, and to see if I am indeed at 435 as stated by the builder, bought the car used a few years ago. After the intake and header install I know I will definatly get a tune to get the most out of it. I was getting very different opinions regarding the tune after the intake swap, most saying its a swap and thats it, I did'nt know about the injecter difference until I started researching this. Is there a way to play with the fuel management without messing up the builders original tune or is that considered part of a tune. Thanks again for all the insight. Just measuring twice before I cut it once. 
Frank
Frank
