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Old 02-24-2010, 09:34 PM   #1
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Default Truck to ls1 intake....am i really going to lose torque?

I've got a 2000 Silverado Z71 daily driver and I've been thinking about putting on an ls1 intake and maybe some headers...I've heard that you lose torque when you switch from truck to ls1 intakes....does anyone know how much?? is it noticeable?
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Old 02-24-2010, 09:50 PM   #2
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why not go with a ls6 intake?
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Old 02-24-2010, 09:55 PM   #3
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actually its a weiand intake but its like a Lingenfelter edition...anyway its something my dad has laying around his shop and he told me if i wanted to try it out i was welcome to but he said i would lose torque....
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Old 02-25-2010, 02:15 AM   #4
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I tried searching for the LS1 Intakes Test,

That Chevy Hi-Performance magazine ran an article about in 2004 but had no luck.
So I have copied and pasted the table of results that I kept.

Quote:
Four different intake manifolds tested here by Chevy Hi-Performance magazine on a stock crate LS1 V8 engine.
After fitting each of the different intakes they then checked the power & torque with three different camshafts.
Peak Power & Torque results below:-


XR265HR (212/218 -114 .522/.529)

Intake
Truck....429hp @ 5900.......422lb-ft @ 4800
LS1......450hp @ 5900.......439lb-ft @ 4900
LS6......459hp @ 5800.......447lb-ft @ 4900
FAST....462hp @ 5900.......450lb-ft @ 4900
-----------------------------------------

XR275HR (222/224 -112 .566/.568)

Truck...468hp @ 6300.......445lb-ft @ 5000
LS1......462hp @ 6300.......442lb-ft @ 5000
LS6......471hp @ 6300.......449lb-ft @ 5000
FAST....479hp @ 6400.......452lb-ft @ 4900
-----------------------------------------
XR281HR (232/234 -112 .595/.598)

Truck....486hp @ 6500.......447lb-ft @ 5000
LS1.......484hp @ 6500.......445lb-ft @ 5000
LS6.......495hp @ 6500.......448lb-ft @ 5000
FAST.....503hp @ 6400.......452lb-ft @ 5000

Chevy Hi-Performance magazine 08-2004.
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Old 02-25-2010, 09:41 AM   #5
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Peak numbers don't really tell the whole story, you need to see what the dyno graph looks like to see what the actual torque curve looks like. But if you aren't towing a lot, I doubt you would see much of a difference in low end grunt just by swapping intakes.
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Old 02-25-2010, 09:41 AM   #6
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What you need is a dyno chart comparison. I saw one on another forum where a guy did a side by side test on the same engine in his swap and a magazine had done a similar test on a stand. Then they took the results and averlaid them in different colors so it was apparent where the gains and losses were. The truck had more torque down low but less HP on top, the car intakes were the reverse. I can't find it, can't remember the numbers and don't even know if it would have been noticeable in real world driving conditions or not.

Edit - Dammit Disnitch... a person that thinks like I do when I do.
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Old 02-25-2010, 02:12 PM   #7
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Quote:
Originally Posted by Sid447 View Post
I tried searching for the LS1 Intakes Test,

That Chevy Hi-Performance magazine ran an article about in 2004 but had no luck.
So I have copied and pasted the table of results that I kept.
Here's a link to the study: http://www.tpis.com/index.php?module=2_17_06
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Old 02-25-2010, 06:18 PM   #8
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Search on the Performance Trucks section of this site. There are people there that have done it and posted their results. From what I remember reading quite a while ago the water pump needs to be ground down to clear the lower TB location becuase the truck water pumps are a little different than the car ones.
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Old 02-25-2010, 06:42 PM   #9
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It's not worth the trouble , the idler pulley will have to be relocated you will have to swap water pumps, injectors and pigtails. Not at all worth it. I swapped to an ls6 intake in my truck in sig. Save your coin and buy a cam and a stall. Performance trucks forum will help a ton.
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Old 02-28-2010, 05:59 PM   #10
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thanks for the input.
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Old 02-28-2010, 07:00 PM   #11
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Try a new F.A.S.T. truck intake. $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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Old 03-08-2010, 12:26 AM   #12
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Quote:
Originally Posted by 1969x11 View Post
It's not worth the trouble , the idler pulley will have to be relocated you will have to swap water pumps, injectors and pigtails. Not at all worth it. I swapped to an ls6 intake in my truck in sig. Save your coin and buy a cam and a stall. Performance trucks forum will help a ton.
would I need to make those same changes if i swapped out my truck intake on my 72 Nova for LS1/LS6 intake? I figured fuel rails, but did not know what else I might need.
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Old 03-08-2010, 10:42 AM   #13
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Quote:
Originally Posted by crosstraining View Post
would I need to make those same changes if i swapped out my truck intake on my 72 Nova for LS1/LS6 intake? I figured fuel rails, but did not know what else I might need.
Fuel rails, injectors, intake bolts (in think). Truck water pump may interfere with the car setup though.
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Old 03-08-2010, 11:36 AM   #14
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What about the LS2 TBSS Intake?
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Old 03-08-2010, 08:21 PM   #15
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Quote:
Originally Posted by the_merv View Post
What about the LS2 TBSS Intake?
bump for the LS2 intake?
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Old 03-09-2010, 12:17 AM   #16
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Default torque loss switching to a car intake

In general any time you shorten the intake runners in a EFI manifold you are shifting the power band or torque curve upwards. The car intakes, LS1 and LS6 have shorter intake runners because they are in lighter cars and need more midrange and high end power. The motor gets the lighter car out of the hole faster. Trucks are much heavier so they need more low end grunt or torque to just get them going out of the hole. Truck manifolds have the longest intake runners for low end torque. So yes you will lose low end torque but gain in midrange and the high end of the power band. The truck manifold is good till about 5700 RPM then it dies. An LS6 manifold will pull till 6800 RPM. How heavy is your truck? Realistically, how often do you rev your motor driving beyond 5700 RPM? What gears will you be running in the rear end? Compare your trucks weight to the curb weight of a F body camaro. How much heavier is it? You have a truck. For performance stick with a truck manifold. For looks, the LS6. You will drop some low end torque, but it will pull harder on the high end when really winding the motor all out.

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Old 03-09-2010, 12:17 AM
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