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*****fast lsxrt 102mm vs tbss intake manifold dyno results*****


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Well i recently got dyno tune with my H/C 370 running the TBSS intake manifold. I just purchased a fast lsxrt 102mm intake manifold. I will be going back to the same dyno and tuner. The only difference is going to be the manifold swap and nothing else. Stay tuned for results.....

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Dont have the funds for a 102mm tb so for now going to stay with the ls3 90mm. That way the results are fair and not misleading. A lot of people have the manifold but never did any comparison or evaluation. Hopefully this will answer questions that other people have been searching for....

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Btw here is the test mule specs: 370 cu with mahle forged pistons, prc cnc 799 heads, pac 650 springs, tsp 7.4" pushrods, ls7 lifters, 11.32:1 compression, comp cam trunion upgrade, fti streetsweeper cam 228/232, asp under drive pulley, tbss intake manifold, ls3 90mm tb, 8.1L injectors.

 

Currently making 441rwhp 409rwtq. So that is the base line for the manifold test.....

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im gonna guess that there isnt as much difference. + or - 5-7 hp and tq. He already has the TBSS which is consistently good for 15-20 above the stock manifold. another 20 higher than the tbss? thats 40 hp just from an intake swap (stock to FAST) thats a huge jump... just saying :sleep: for the OP's sake I hope he gets good numbers from it. Thats an expensive manifold!

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Yeah the tbss manifold is better than the stock one but not due to design rather the tb size. Plus i have higher flowing heads so my gains should be nice i am hoping for. The more air youre flowing over stock ia where the intake manifold modifications start to shine.

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Looking forward to the results!

 

I assume you will be fully re-tuned prior to giving a glory run correct? Let us know if when the converter is locked and if it was locked on prior runs (this can make a sizeable impact on overal HP #'s). As always, thank you for posting some reasonably objective data for the group!

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Thanks kevin. Yes these numbers are with the converter locked on a Mustang dyno MD 1100. The weather wont really change either as is been between 95-101 everyday here. I will be fully tuned with the new manifold just as i was with tbss manifold.

 

 

Also thjs manifold picked up 19 rwhp on a stock 5.3L with the current tbss manifold and 87mm tb.....

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