Hello all, a new shop opened up in town that specialize in performance. I recently took them an OEM RBC manifold to have cut open and fully polished, tapered runners, and throttle body opened up to 70mm. I dropped it off sunday and just got it back today and it looks AWESOME! I am running a K24/K20 frank motor built that made 278whp with a stock RBC. Im taking it this weekend for a retune, so ill have dyno charts for you guys very soon!
The manifold is THICK! You can see the weld in places (which is good because I think I will flow better without weld pushed through). Either way it came with a lifetime warranty. They do these for $300
I just don't understand why spend the extra money? Multiple dyno graphs over the past several years have shown essentially equivalence between a ported RBC and a stock RRC.
I know the RRC flows well. I had the RBC and wanted to change this quick. With the work they did on the RBC, im going to let them do a RRC for me this summer
The RRC flows about 330 cfm with a 70mm ported opening.
The RBC is right under 300 cfm, 290 something but if you port the opening to 70mm and you shave down the iacv nipple inside the manifold and seal it up, you can get up to 325'ish cfm.
The guy that used to work at blueprint, Robert, told my friend these numbers over the phone from their flowbench. I'd love to back it up, but maybe he'll post
Well we will see very soon. My car has the exact same setup as it did when it made 278whp, only change made was the porting of the RBC. Its going to the same place with the same tuner. Forget all the CFM and all the other stuff. The dyno wont lie
Well we will see very soon. My car has the exact same setup as it did when it made 278whp, only change made was the porting of the RBC. Its going to the same place with the same tuner. Forget all the CFM and all the other stuff. The dyno wont lie
hmmm I remember palmerblock posting the graphs... but I also think you are assuming it had relocated injectors. I thought the "sprinkler" comment was related to leaky fuel lines or something
the ported RBB made about 10whp over stock. I have seen ported RBC deliver 8-10whp over the right setup. I am sure you can do it with the RRC, once again, with the right setup.
stock for stock I have seen 6-10whp between RBB to RBC to RRC in terms of peak numbers. There can be bigger differences in the midrange
Ill start this off with the K24(2381cc) i built a while back... it was one of the motors used in this test... click the thread below for more specifics... basically its a simple build k24 http://www.k20a.org/forum/showthread.php?t=76065
1st Graph
TEAL PLOT - Ryan fitted a RSP intake manifold that was modified to a sprinkler setup and some other s***, all other things remained the same from the Hondata IMG on one end and the Acura TL TB on the other. -tuning was done to extract all power-
Fuel - 91 octane
Projected Dynojet output - 298hp, 214tq
ORANGE PLOT - only change was removal of the skunk2 FG2 Header and install of the Prototype Header. -tuning was done to extract all power-
Fuel - 91 octane
Projected Dynojet output - 305.7hp, 216.7tq
As I stated, im not really concerned about all these different manifold comparisons. I did this thread to simply show the difference that my ported RBC makes over my OEM RBC. If I gain 5whp, im happy. A gain on my motor is what im looking for. I know theres plenty of people out here with similar setups to mine. Just want to show them the potential (if any) they could have.
just to give you a small comparison from a test i did on my own k24/20. blue is rbc 70mm red is s2pro cut open and cleaned up 74mm and green is kinsler itbs 62. all these were tuned.
dont have any pics of the whole thing. k24/20 kelford bs 12.5 88mm rbc head unported.
did this last summer when we were looking for more power. didnt make much more peak power but we ended up with more rpm to use
worthless as it may be......the green is cut off at 9500 so basically the graph i have posted shows roughly 7.5-10k graph.
i really dont understand why one would say its worthless. it clearly points out the comparison in the upper rpm of these three manifolds on a certain setup on the same dynojet
So we have to take your word for it? Why would you crop out the rest of the graph??? Why post a graph at all?? Why not just describe to us what the curves looked like and what color they were?? Lol
It makes absolutely no sense to post a crop of a dyno graph unless you're trying to hide something.
The reason I have a cropped pic is because I had sent it to a friend via cell phone to show him the differences when I did this.
That is he only pic I had available and I havnt had time to come up with a whole thing.
What is it that you think I'm hiding?
You will have to just believe me that what I am telling you is true. I have no reason to lie or hide anything. I never have had to hide anything about my car or its setup.
I thought I was putting up something helpful but I guess I was wrong.
Sorry for wasting everyone time.
Don't be a sour butt. Thanks for sharing, I just wish we could see the full graphs.
ITBs usually give a big boost in midrange torque...I find it odd that the midrange was identical between all three setups. In my mind, this raises the possibility that tuning was suboptimal.
View attachment 34481
No not butt hurt at all I wish I had the whole pic. This was a year ago.
I looked thru my phone and this is the original pic that I had used to crop the one I posted was the ig pic. Best I can do for you guys. Tuning was spot on.
I know that the red dip was tuned out but I what i think happened is that we chose the wrong file when we were overlaying them. I am certain it was a small fuel issue. Believe me or not.
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