LQ4 vs LS6 Intake
02-05-2006, 04:04 PM
#1
LQ4 vs LS6 Intake I saw this thread over at the Corvette forum and thought it was very interesting. Anyone have any comments or experience using this set-up?
"Yes, the 6.0L truck intake in all its ugly *** glory actually makes more power than the LS6 intake, and more torque across the entire power band.
Just a little FYI, for all those interested in doing Intake Swaps on there LS1's and LS6's. If you look at the new Chevy High Performance Magazine, it will show you that the 6.0L Truck Intakes make more Horse Power and Torque then the LS6 Intakes. It also makes more Horse Power then the F.A.S.T. intake, but it does make like 7 Less Ft. Lbs. This was tested on the Stock Cams they said, so next month they will do a test on cam swaps, and the month after that they will do a test with heads too. But it looks like if you want to pick up a quick 8 Horse Power, and 3 Ft. Lbs. switch to a 6.0L Truck Intake.
LS1 = 419.7HP@4700 / 416.0TQ@5800
LS6 = 425.5HP@4700 / 421.0TQ@5700
6.0L Truck = 427.9HP@4700 / 419.0TQ@5900
F.A.S.T. LSX = 426.2HP@4800 / 427TQ@5900
Wieand/Lingenfelter = 411.2HP@4800 / 408.6TQ@6000
These were all done on a 346 cu. in LS1. This was a Mildly modified 1998 LS1 Crate Motor P/N 25534322. The article reads and I quote "What had allready been done to this engine is inconsequential for this test session. OUr concern was, as yours should be, about the numbers each manifold generated in a controlled environment."
Hope this helps you all. I would point out that even though slightly, the 6.0L Intake has higher numbers across the whole Torque band, and the and in the graph it shows it higher then the F.A.S.T. Actually I think that there guide to the graph is backwards(LOL) So it actually shows the 6.0L has higher HP all across the board not just peak, and that it is even with the LSX until 5300 for TQ.
With all the hype I hear about the LSX it was interesting to see dyno numbers, especially for a stock intake. In defense of the Lingenfelter, it is an aluminum intake, and not the nylon composite. There bottom plate is removable for lots of porting though but it does require conventional gaskets. Something to think about..........................
They also say that the going price of the 6.0L intake from a wrecking yard is about $100, so it is about 1/4 a LS6 (roughly $390) and 1/8 the F.A.S.T. (roughly $780). So I would much rather go with a 6.0L Intake, and then spend $700 on some other go fast goodies.
So, does anyone have any experience with this intake..? I'm just having some issues with how terribly ugly they are."
Very interesting. I have a 2001 2500 HD with the 6.0 LQ4 that I am acquiring parts for a mod make over (Hooker Headers, 220/224 114 lsa cam, Heads, Corsa exhaust, Outlaw intake, etc.). Most everyone I have spoke with has recommended going to the FAST 90mm intake and TB but after reviewing this information it may be best to keep what I have.
My question is that I can not find specs TB opening for the LQ4 intake. Does anybody know the diamter meaning is it 78mm opening or 85mm opening?
Does anyone have any recommendations on porting my stock LQ4 intake up to an 85mm and adding an aftermarket TB or based on my mods should I stick with the stock LQ4 intake diameter and just have the stock OEM throttle body ported? Any thoughts would be very much appreciated. I know this a truck question on the LS1 tech forum but I have not been able to get any information at all regarding this topic out on the web.
Thanks!!!
"Yes, the 6.0L truck intake in all its ugly *** glory actually makes more power than the LS6 intake, and more torque across the entire power band.
Just a little FYI, for all those interested in doing Intake Swaps on there LS1's and LS6's. If you look at the new Chevy High Performance Magazine, it will show you that the 6.0L Truck Intakes make more Horse Power and Torque then the LS6 Intakes. It also makes more Horse Power then the F.A.S.T. intake, but it does make like 7 Less Ft. Lbs. This was tested on the Stock Cams they said, so next month they will do a test on cam swaps, and the month after that they will do a test with heads too. But it looks like if you want to pick up a quick 8 Horse Power, and 3 Ft. Lbs. switch to a 6.0L Truck Intake.
LS1 = 419.7HP@4700 / 416.0TQ@5800
LS6 = 425.5HP@4700 / 421.0TQ@5700
6.0L Truck = 427.9HP@4700 / 419.0TQ@5900
F.A.S.T. LSX = 426.2HP@4800 / 427TQ@5900
Wieand/Lingenfelter = 411.2HP@4800 / 408.6TQ@6000
These were all done on a 346 cu. in LS1. This was a Mildly modified 1998 LS1 Crate Motor P/N 25534322. The article reads and I quote "What had allready been done to this engine is inconsequential for this test session. OUr concern was, as yours should be, about the numbers each manifold generated in a controlled environment."
Hope this helps you all. I would point out that even though slightly, the 6.0L Intake has higher numbers across the whole Torque band, and the and in the graph it shows it higher then the F.A.S.T. Actually I think that there guide to the graph is backwards(LOL) So it actually shows the 6.0L has higher HP all across the board not just peak, and that it is even with the LSX until 5300 for TQ.
With all the hype I hear about the LSX it was interesting to see dyno numbers, especially for a stock intake. In defense of the Lingenfelter, it is an aluminum intake, and not the nylon composite. There bottom plate is removable for lots of porting though but it does require conventional gaskets. Something to think about..........................
They also say that the going price of the 6.0L intake from a wrecking yard is about $100, so it is about 1/4 a LS6 (roughly $390) and 1/8 the F.A.S.T. (roughly $780). So I would much rather go with a 6.0L Intake, and then spend $700 on some other go fast goodies.
So, does anyone have any experience with this intake..? I'm just having some issues with how terribly ugly they are."
Very interesting. I have a 2001 2500 HD with the 6.0 LQ4 that I am acquiring parts for a mod make over (Hooker Headers, 220/224 114 lsa cam, Heads, Corsa exhaust, Outlaw intake, etc.). Most everyone I have spoke with has recommended going to the FAST 90mm intake and TB but after reviewing this information it may be best to keep what I have.
My question is that I can not find specs TB opening for the LQ4 intake. Does anybody know the diamter meaning is it 78mm opening or 85mm opening?
Does anyone have any recommendations on porting my stock LQ4 intake up to an 85mm and adding an aftermarket TB or based on my mods should I stick with the stock LQ4 intake diameter and just have the stock OEM throttle body ported? Any thoughts would be very much appreciated. I know this a truck question on the LS1 tech forum but I have not been able to get any information at all regarding this topic out on the web.
Thanks!!!
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Homer_Simpson (01-04-2022)
02-05-2006, 04:56 PM
#4
I honestly don't know as I have a 2500 HD truck and I used to own a 2000 SS camaro but I just can't recall. Looking at the truck intake and reading a few other replies the truck intake may be taller than the LS6 as it was designed for the vette with less clearance under the hood.
Maybe somebody out here has a 6.0 truck that they can compare to an F-body or a Vette. I would read the thread over at the vette forum:
http://forums.corvetteforum.com/show...466&forum_id=1
Hope this helps... Any comments/recommendations on using a ported TB or my truck intake that has been ported? Thanks in advance.
Maybe somebody out here has a 6.0 truck that they can compare to an F-body or a Vette. I would read the thread over at the vette forum:
http://forums.corvetteforum.com/show...466&forum_id=1
Hope this helps... Any comments/recommendations on using a ported TB or my truck intake that has been ported? Thanks in advance.
02-05-2006, 05:18 PM
#5
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I've heard of using the truck intake before. It's down on torque compared to the LS6 and isn't really recommended as a performance upgrade.
I wouldn't count on it fitting under a f-body cowl either. The stock f-body fuel rail wouldn't fit either. The 6.0L uses a taller fuel rail so it can cross over the intake. Earlier year fuel rails were also a return style system.
Your car would probably feel slower if you could manage to make the 6.0L fit and it's not worth trying.
In the summer 2004 Camaro Performers magazine there was a LS1 DOs & DON'Ts section and the truck intake was under DON'Ts. The exact word's were "Forget the truck-style. From a performance standpoint, it ranks below the standard LS1 intake."
I wouldn't count on it fitting under a f-body cowl either. The stock f-body fuel rail wouldn't fit either. The 6.0L uses a taller fuel rail so it can cross over the intake. Earlier year fuel rails were also a return style system.
Your car would probably feel slower if you could manage to make the 6.0L fit and it's not worth trying.
In the summer 2004 Camaro Performers magazine there was a LS1 DOs & DON'Ts section and the truck intake was under DON'Ts. The exact word's were "Forget the truck-style. From a performance standpoint, it ranks below the standard LS1 intake."
02-05-2006, 06:08 PM
#6
well no **** there hp is gonna be equal @ ~4700rpm. the truck intakes have longer runners then the ls1/ls6 intake. the long runners help with low end tq which the trucks need. however, do a pull to 6k and you'll find out why the shorter runners of the ls1/ls6 intake will make more power.
