LSX Intake manifold power gains on stock cubed heads/cam car
10-01-2003, 10:21 AM
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LSX Intake manifold power gains on stock cubed heads/cam car I see tons of questions about the effects of the LSX on stocked cubed heads/cam cars, and whether or not you a 90mm TB and 90mm FAST manifold would be worht it for a stock cubed car.
I don't think the 90mm manifold and TB are worth it unless you plan on going w/ bigger cubes down the road.
I think some LSX benefits come from port matching and for those of us who make lots of power above 6500-6600rpms when the ls6 intake seems to crap out a bit.
I still see the ls6 intake as the bottle neck on cars with high flowing heads.
The only negative I see is that gains will only be from 4500rpms and up, which doesn't make it as worth it for cars shifting in the 5500-6000rpm range.
I don't think the 90mm manifold and TB are worth it unless you plan on going w/ bigger cubes down the road.
I think some LSX benefits come from port matching and for those of us who make lots of power above 6500-6600rpms when the ls6 intake seems to crap out a bit.
I still see the ls6 intake as the bottle neck on cars with high flowing heads.
The only negative I see is that gains will only be from 4500rpms and up, which doesn't make it as worth it for cars shifting in the 5500-6000rpm range.
10-01-2003, 10:29 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car From what i understand the ls6 intake should be sufficient for most head/cam combo's. There would be no benefit to my c1 cam/stock head set up. I'm going with the ls6.
10-01-2003, 11:28 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car
From what i understand the ls6 intake should be sufficient for most head/cam combo's.
10-01-2003, 11:40 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car I can't wait to slap a LSX with a 90mm TB on my 422, I hope this product turns out to be really good, not a flop like that aluminum thing.
10-01-2003, 11:41 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car I'm waiting on this answer before I plunk down 800 bones for that piece of plastic 
10-01-2003, 01:07 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car It is a lot of money to be spent on a 3-piece plastic intake. Not to mention with the 90, you will want the bigger TB and MAF, even though MAFs only go up to 85mm. Oh well, I guess the first GP will show us whether or not it's worth it.
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10-01-2003, 01:29 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car I dunno... it seems that cylinder head flow drops considerably with the intake in place... by something like ~30 or so cfm if I remember correctly. If a new intake could halve that flow loss (to a 15 cfm drop between open/radiused port flow and through-the-intake flow), it could be worth some power even on the H/C cars.
It'll be interesting to see.
It'll be interesting to see.
10-01-2003, 01:39 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car considering the LS6 intake was like $500 when it came out, $800 seems like a steel, especially for the big boys. Hell, the fact that you couls always port or make direct n2o ports makes it worthwhile. Now, yes, you need to factor in the TB, but if you have an LS6 already, you can recover $400+ of your cash right there selling the intake/TB. It will be a loooong time beofre I need one, but can't wait for them to come out. Then I'l be able to get an LS6 cheap 
10-01-2003, 03:22 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car
I'm waiting on this answer before I plunk down 800 bones for that piece of plastic
10-01-2003, 05:09 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car The simple truth is that we wont know if it will produce any gains, until some independent testing is done (by sponsors and member of this board). I've learned that you cant take the word of a manufacturer as to the gains.
I'm taking the wait & see approact on this one.
I'm taking the wait & see approact on this one.
10-01-2003, 06:53 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car
but if you have an LS6 already, you can recover $400+ of your cash right there selling the intake/TB.
10-01-2003, 07:07 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car Yes, I just picked up a brand new one on Ebay for $315 and $25 shipping, I think used prices will fall to $225 to $250 if the LSX hits it's marks.
10-02-2003, 07:12 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car
but if you have an LS6 already, you can recover $400+ of your cash right there selling the intake/TB.
Yes, I just picked up a brand new one on Ebay for $315 and $25 shipping, I think used prices will fall to $225 to $250 if the LSX hits it's marks.
10-05-2003, 10:10 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car On the TB front...
The stock unit can't go to 78mm to match the 78mm LSX intake, but it can go oversize, so it's going to take more than a home port job to get the most out of those things.
On the big 90mm versions, those guys are going to run the FAST TB anyways.
We are selling the LSX intakes too ($795) and I will get a 90mm TB in to see what I can do to it.
Bret
The stock unit can't go to 78mm to match the 78mm LSX intake, but it can go oversize, so it's going to take more than a home port job to get the most out of those things.
On the big 90mm versions, those guys are going to run the FAST TB anyways.
We are selling the LSX intakes too ($795) and I will get a 90mm TB in to see what I can do to it.
Bret
10-05-2003, 10:14 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car I'm still trying to figure out if the stock TB will bolt up to the 90 mm version. This way I can get the larger hole, and upgrade when I go to bigger cubes. No need for a 90mm TB right now. Anyone know?
10-05-2003, 10:53 PM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car Or better yet, can you run a 90mm TB on a stock cubed motor and not lose any power, so that you can have all the necessary components when you upgrade to a bigger motor?
10-06-2003, 02:07 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car I herd that the 90mm version will not be out for some time. Only the 78mm versions will be available later this year. I'm with 30th TA I will ****** up one of the used LS6s off of somebodys big cube motor.
10-06-2003, 06:31 AM
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Re: LSX Intake manifold power gains on stock cubed heads/cam car And I'm hoping the 90mm has some room left for grinding so that I might be able to bolt a 95mm Mustang TB on to it (with an adapter plate).
Bigger is better.
I have a 58mm BBK TB (and ported intake) on the 4.3L L99 motor in my '94Z, and watching the datalogs, it doesn't pull much vacuum at WOT (MAP hovers near max). There are NO problems at all running a larger TB.
-Andrew
Bigger is better.
I have a 58mm BBK TB (and ported intake) on the 4.3L L99 motor in my '94Z, and watching the datalogs, it doesn't pull much vacuum at WOT (MAP hovers near max). There are NO problems at all running a larger TB. -Andrew