Intake Flow Numbers: 78mm LS1, 90mm TBSS, 92mm Dorman LS2 & 102mm Fast LSXRT - Page 3 - LS1TECH - Camaro and Firebird Forum Discussion



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Intake Flow Numbers: 78mm LS1, 90mm TBSS, 92mm Dorman LS2 & 102mm Fast LSXRT

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Old 03-01-2017, 10:55 AM   #41
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thank you for taking the time to get this tested. im very impressed with this. it stayed ahead of the tbss intake until about .600" of lift and even not that far behind at .650" lift. like you stated before, that intake is widely regarded as being the best performing factory intake and dyno proven to make more power over the ls6. i am really curious as to how much more it can

i think that right there would be enough to say that its an improvement over the ls2 since, and please correct if im mistaken, the ls6 performs better then ls2. i am just deducing different things that i have gathered and stored in my collective memory......
Yes everyone here should thank 99 Black Bird for taking the time and expense to do this testing . He did what he promised and came through in a timely manner. When I look at the results I'm impressed by mid range flow of LS2D . But looking at the numbers of the LS1 , TBSS, and LSXRT this flow bench appears to be a bit conservative , compared with other published results. This does not make this any the less credible, but on another bench the #s may have been slightly higher. I had predicted that the LSD2 would do 260 cfm out of the box , while it fell short of that . If he sends this off to have a full port job this intake should gain another 5-7 cfm and put it well within the 260 mark. Again Thanks for a great test , if you would have not stepped up to the plate ,it may have been months maybe years before testing like this was preformed .
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Old 03-01-2017, 11:02 AM   #42
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It's not about absolute numbers, but how they compare. If all manifolds flow low, then who cares? Especially if some are a known quantity. Same with dynos. As long as the same one is used for any/all tests on a certain subject, it's all about how they contrast/compare to each other.
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Old 03-01-2017, 11:10 AM   #43
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I love this stuff!

While plans get conjured for round 2 of his flow bench testing, figured I would share a track test I did a few years back with 3 cathedral intakes on a high 11sec 6.0L build.



http://www.yellowbullet.com/forum/sh....php?t=604281&

Yellowbullet brains declared that each intake needs it's own cam grind...and my converter sucked.
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Old 03-01-2017, 11:25 AM   #44
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Originally Posted by G Atsma View Post
It's not about absolute numbers, but how they compare. If all manifolds flow low, then who cares? Especially if some are a known quantity. Same with dynos. As long as the same one is used for any/all tests on a certain subject, it's all about how they contrast/compare to each other.
Agreed
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Old 03-01-2017, 11:31 AM   #45
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Really great job. It is nice to see them all compared on the same flow bench. I always wish we had this for some of the more popular heads on the same flow bench.
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Old 03-01-2017, 05:50 PM   #46
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Thanks for taking the time to provide us with some real technical data. Looks like im going to order the dorman ls2 and drop it off to my guy who is also porting a set of 243 heads for me.
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Old 03-01-2017, 07:09 PM   #47
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Originally Posted by taman86 View Post
Im considering sending my stock ls6 / 85mm tb with adapter
Odd thing is the actual intake opening size on the ls6 intake and the truck intakes are 74mm.
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I love this stuff!

While plans get conjured for round 2 of his flow bench testing, figured I would share a track test I did a few years back with 3 cathedral intakes on a high 11sec 6.0L build.



http://www.yellowbullet.com/forum/sh....php?t=604281&

Yellowbullet brains declared that each intake needs it's own cam grind...and my converter sucked.
Awesome info there dude! Thanks for sharing.

The dorman stuff looks interesting. Love to see them dyno tested.
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Old 03-01-2017, 08:04 PM   #48
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I plan on upgrading to the dorman intake. My car has a street tune and a yank 3200SS. It is stock other wise from suspension upgrades.

I plan on putting a 92mm NW TB, 100mm TSP MAF and a 104mm FTP lid.

Future plans are the hooker black heart 2.5 true dual system with the mid length 1 7/8 headers for the lowered ride height.

Would it make sense at this juncture to change the 2000 LS1 injectors?

Some time not too soon I may go with a small cam and 243 heads.

Last edited by 30thanniv; 03-01-2017 at 08:13 PM.
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Old 03-01-2017, 08:30 PM   #49
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Originally Posted by 30thanniv View Post
I plan on upgrading to the dorman intake. My car has a street tune and a yank 3200SS. It is stock other wise from suspension upgrades.

I plan on putting a 92mm NW TB, 100mm TSP MAF and a 104mm FTP lid.

Future plans are the hooker black heart 2.5 true dual system with the mid length 1 7/8 headers for the lowered ride height.

Would it make sense at this juncture to change the 2000 LS1 injectors?

Some time not too soon I may go with a small cam and 243 heads.
I wouldnt worry about injectors until your over 400whp and a cam sbould get you there.
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Old 03-01-2017, 08:47 PM   #50
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Najania, I like German cars too!. The Porsche 924 Turbo was my first car crush.My x-gIrlfriend owns a Mercedes SLK350 and used to have a 911 Turbo. Her daughter is a devout Audi fan and owner. I briefly had an 02 BMW 540. Sadly were I live few few people really know how to repair or maintain them.

Regarding the TPiS LS6 I have one that Peak did the radical port work to the runners and plenum. Its on my 91 RS with the 383 LS1. Made 465 hp at wheels with a small 229/229 cam. My RS Drive line eats about 60 to 75 hp in my RS so 465+60 =525 or 465 +75=540 so at 2 hp per cfm as mentioned above the very tricked out TPiS LS6 on my RS probably is good for around 263 to 270 cfm. My TEA LS6 heads did 256 to 258 cfm with an LS6 intake and ported TB so I think that is a fair guess. In any case there is a reason the LSXRT is sitting on the shelf and not on the RS anymore. The TPiS LS6 edged the LSXRT by 2hp dyno tested on my RS. With a bigger cam I'm sure the LSXRT would have easily dominated. I like it when math and results are in the same ball park.

I hope to have a LS2/LS3 403/416 build with a big cam and put the LSXRT to work in another 3rd Gen Camaro eventually...

OMC8, you are correct, I was told the bench does give results that are a little lower than many benches. That is why I choose not to state the name of the vendor that did the 243/LS6 head used in the test. I didn't want anyone to mistakenly get the wrong idea about the vendors cylinder heads. I was told very few heads tested on this bench break 300 cfm. I like this bench it reads very similar to the one my NASCAR friends used to use for testing.

NOS327, I have intake envy! That's a cool trio of intakes! I would love to test one or all of them..wink

To Everyone thank you for the kind words! I like doing my small part to help LS's go fast and be fun to drive.

Sneak peak..I asked Mike Norris MotorSports to save a few old valve springs from my 99 TA, I plan to get them tested and we will know what 60,000 miles of XE-R.lobe really does to a Comp 978 dual spring.
​​​​​​

Last edited by 99 Black Bird T/A; 03-01-2017 at 09:11 PM.
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Old 03-02-2017, 09:19 AM   #51
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So the Dorman flows 10 cfm more than an ls1 intake?
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Old 03-02-2017, 10:23 AM   #52
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So the Dorman flows 10 cfm more than an ls1 intake?
Yup, and a lot more than that below .500.
I'm curious as to how it would do against a stock LS6.
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Old 03-02-2017, 12:50 PM   #53
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Originally Posted by G Atsma View Post
Yup, and a lot more than that below .500.
I'm curious as to how it would do against a stock LS6.
you will know soon enough. ive committed my ls6 to the test.
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Old 03-02-2017, 02:49 PM   #54
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Originally Posted by 99 Black Bird T/A View Post
Najania, I like German cars too!. The Porsche 924 Turbo was my first car crush.My x-gIrlfriend owns a Mercedes SLK350 and used to have a 911 Turbo. Her daughter is a devout Audi fan and owner. I briefly had an 02 BMW 540. Sadly were I live few few people really know how to repair or maintain them.

Regarding the TPiS LS6 I have one that Peak did the radical port work to the runners and plenum. Its on my 91 RS with the 383 LS1. Made 465 hp at wheels with a small 229/229 cam. My RS Drive line eats about 60 to 75 hp in my RS so 465+60 =525 or 465 +75=540 so at 2 hp per cfm as mentioned above the very tricked out TPiS LS6 on my RS probably is good for around 263 to 270 cfm. My TEA LS6 heads did 256 to 258 cfm with an LS6 intake and ported TB so I think that is a fair guess. In any case there is a reason the LSXRT is sitting on the shelf and not on the RS anymore. The TPiS LS6 edged the LSXRT by 2hp dyno tested on my RS. With a bigger cam I'm sure the LSXRT would have easily dominated. I like it when math and results are in the same ball park.

I hope to have a LS2/LS3 403/416 build with a big cam and put the LSXRT to work in another 3rd Gen Camaro eventually...

OMC8, you are correct, I was told the bench does give results that are a little lower than many benches. That is why I choose not to state the name of the vendor that did the 243/LS6 head used in the test. I didn't want anyone to mistakenly get the wrong idea about the vendors cylinder heads. I was told very few heads tested on this bench break 300 cfm. I like this bench it reads very similar to the one my NASCAR friends used to use for testing.

NOS327, I have intake envy! That's a cool trio of intakes! I would love to test one or all of them..wink

To Everyone thank you for the kind words! I like doing my small part to help LS's go fast and be fun to drive.

Sneak peak..I asked Mike Norris MotorSports to save a few old valve springs from my 99 TA, I plan to get them tested and we will know what 60,000 miles of XE-R.lobe really does to a Comp 978 dual spring.
​​​​​​
Gotcha , understood thanks for clarifying that and the insight to the other intakes that you have used in the past.
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Old 03-02-2017, 03:47 PM   #55
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Very cool of you to share this with everyone.
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Old 03-02-2017, 05:33 PM   #56
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My guess is the Dorman ls2 will be a good match for an ls6 intake. Need to see how the Dorman does with good porting. The fasts are still better at this point
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Old 03-02-2017, 06:18 PM   #57
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My guess is the Dorman ls2 will be a good match for an ls6 intake. Need to see how the Dorman does with good porting. The fasts are still better at this point
the dorman is flowing better then the tbss intake out of the box up to about .600" of lift. the tbss intake is better then the ls6. and yes the fasts are better, the lsxrt tested proves that. but also at 1k versus 340. the dorman is not supposed to be a competitor for the aftermarket flowing high at the top. it is designed for a oem replacement for mid range power and so far it does that well.
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Old 03-02-2017, 07:11 PM   #58
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Originally Posted by NOS327 View Post
I love this stuff!

While plans get conjured for round 2 of his flow bench testing, figured I would share a track test I did a few years back with 3 cathedral intakes on a high 11sec 6.0L build.



http://www.yellowbullet.com/forum/sh....php?t=604281&

Yellowbullet brains declared that each intake needs it's own cam grind...and my converter sucked.
NOS327, that's a fantastic thread. Thank you for sharing the drag strip testing!
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Old 03-02-2017, 09:34 PM   #59
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My guess is the Dorman ls2 will be a good match for an ls6 intake. Need to see how the Dorman does with good porting. The fasts are still better at this point
Bang for the buck, the Dorman is a clear winner, as TBSS manifolds are not as easy to get anymore, and anything with the FAST name on it inspires financial anguish.
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Old 03-02-2017, 10:23 PM   #60
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Bang for the buck, the Dorman is a clear winner, as TBSS manifolds are not as easy to get anymore, and anything with the FAST name on it inspires financial anguish.
TBSS should be on every 08-13 truck 5.3. Although I think it's too tall for a Fbody.
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