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Old 01-17-2013, 04:19 AM   #1 (permalink)
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Rrc vs rbc manifold

What's the difference exactly? I was told the rbc is nearly the same as rrc. I want to get the j35 tb mod and the rrc but will it really make that much of a difference if I just do the tb swap?

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Old 01-17-2013, 08:32 AM   #2 (permalink)
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There a couple of cheap easy modifications you can do to the RBC to make it flow very similar to an RRC.

I just wouldn't waste money on an RRC.
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Old 01-17-2013, 09:09 AM   #3 (permalink)
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Unless you buy one gently used for a good deal lol.

OP, I'm sure you know: with N/A, better flowing parts (intake, header, exhaust, TB, IM, cams, etc.) all work in conjunction with one another to make more power. By themselves, they may make power, however, it will not be nearly as much as all together. You may see a small gain with a J35 TB and a slighlty bigger one with a RRC or ported RBC. Some nice cams would be great as well.

Also, if your profile page has the correct mods listed, I'd recommend a better intake (3.5") and a better flowing exhaust (Q300, Full Race, HyTech, etc.) to maximize your gains.

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Old 01-17-2013, 09:45 AM   #4 (permalink)
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Throw that Junk2 Alpha in a ditch to start with & like ^ said, get a bigger diameter intake. If you're planning to stay N/A or turbo then got to a bigger exhaust for some better flow to go along with a better RH.
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Old 01-17-2013, 09:54 AM   #5 (permalink)
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There a couple of cheap easy modifications you can do to the RBC to make it flow very similar to an RRC.

I just wouldn't waste money on an RRC.
Do tell..
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Old 01-17-2013, 10:16 AM   #6 (permalink)
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Re: Rrc vs rbc manifold

I ported my inlet to 70mm and shaved the IVAC bump in the plenum for $80 and flows just as good, if not better than the $400 RRC.
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Old 01-17-2013, 10:17 AM   #7 (permalink)
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Throw that Junk2 Alpha in a ditch to start with & like ^ said, get a bigger diameter intake. If you're planning to stay N/A or turbo then got to a bigger exhaust for some better flow to go along with a better RH.
Why do you find tha alpha header Junk? please explain just curious

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Old 01-17-2013, 10:53 AM   #8 (permalink)
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The alpha header isn't junk per say however, it does have less quality welds then say the Skunk 2 megapower header which is why it is cheaper.
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Old 01-17-2013, 11:08 AM   #9 (permalink)
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The alpha header isn't junk per say however, it does have less quality welds then say the Skunk 2 megapower header which is why it is cheaper.
That i already know i have held both header in my hand and seen the diffrence....but what im saying skunk alpha/and or mega are they not the best off the shelf header u can buy all around gains..not comparing to custom like ASP
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Old 01-17-2013, 11:31 AM   #10 (permalink)
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I ported my inlet to 70mm and shaved the IVAC bump in the plenum for $80 and flows just as good, if not better than the $400 RRC.
i mean yeah eliminating the iacv port on the rbc is better but the runners on the rrc is soo much wider than rbc that u cannot duplicate unless porting .
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Old 01-17-2013, 12:32 PM   #11 (permalink)
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^^ no. A ported RBC outflows the RRC really badly. over 30-40 cfm more flow.
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Old 01-17-2013, 03:54 PM   #12 (permalink)
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Re: Rrc vs rbc manifold

Thanks for the input guys.

What kind of 3.5inch intake should I buy? I got the injen sri mainly because it was carb legal

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Old 01-17-2013, 04:03 PM   #13 (permalink)
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Rrc vs rbc manifold

You have 3 options for a 3.5" intake, the import dps Rick spec'd intake (Sri or CAI), the skunk2 CAI, or the new and on pre-order hybrid racing intake. I have a Rick spec'd and I love mine.
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Old 01-17-2013, 04:21 PM   #14 (permalink)
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Re: Rrc vs rbc manifold

Ahh okay thanks ill start researching them right away

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Old 01-17-2013, 04:49 PM   #15 (permalink)
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The Alpha header IMO is the best OTS header you can purchase on the market. Well designed (megapower), cheap, and its great quality for the price. My alpha header was awesome. As for the RBC, do like the recent guy posted. Ope TB port to 70mm and delete IACV, then you will have a very similar flow to the RRC. FLOW BENCH TESTED, with doing those mods to an RBC, it only flows a difference of 5 CFM than a RRC. So the runners aren't as different as some may think. 3.5" intake, 70mm TB, modified RBC, Alpha header, q300 or 3", you will be set.

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Old 01-17-2013, 04:59 PM   #16 (permalink)
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Re: Rrc vs rbc manifold

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Originally Posted by kris5597 View Post
The Alpha header IMO is the best OTS header you can purchase on the market. Well designed (megapower), cheap, and its great quality for the price. My alpha header was awesome. As for the RBC, do like the recent guy posted. Ope TB port to 70mm and delete IACV, then you will have a very similar flow to the RRC. FLOW BENCH TESTED, with doing those mods to an RBC, it only flows a difference of 5 CFM than a RRC. So the runners aren't as different as some may think. 3.5" intake, 70mm TB, modified RBC, Alpha header, q300 or 3", you will be set.

Kris
Thanks for this. Im strongly considering just modding the rbc. The rrc is too expensive

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Old 01-17-2013, 07:56 PM   #17 (permalink)
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^^ no. A ported RBC outflows the RRC really badly. over 30-40 cfm more flow.
wrong stephen lol Theres a dyno that Endyn did on k20a.org ported RBC vs Stock RRC and they even said they were similar but the RRC edged it out by like 3-5 hp.

Looking at the big picture is 3-5hp worth it probably not but point is stock rrc vs ported rbc, the rrc is better.

and yes i know 3-5hp there are variables i.e. dyno, mods, ect ect

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Old 01-17-2013, 08:04 PM   #18 (permalink)
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Re: Rrc vs rbc manifold

You just said it yourself. Too many variables between said two vehicles to determine rather RRC is better than RBC according to dyno graphs. The only way is to do a cfm flow chart.

Unmodified RRC vs unmodified RBC, I am sure RRC wins. However, 70mm ported RBC vs. Unmodified RRC? Could be competitive. Regardless, $80 to port match a j35 or $250ish j37 vs. $400 for a RRC + $125 j35?

It comes down to power per dollar + tune.
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