Hi.
I am building K20 setup. What intake manifold should i get? My budget is up to 1000 usd about this part. What do you think about RRC and RSP intake?
Thank you!

 

what kind of power do you want to make? how high are you revving?

 

much as possible >270whp

 

$1000 will buy both manifolds. Port both to 74 mm (this will require some minor welding/fabrication) and run a 74 mm tb.

Test them both on the dyno (with tuning to extract all power) and sell the one that makes less. This will give you the only definite answer to your question...everything else is just internet experts and bro science.

Good luck and post your results!

 

yeah what BND said..... and i know a guy that does really good intake manifold porting.


mike

 

Yeah, I was only referring to port matching the TB inlet.

TBH, I've been unimpressed by the results after RBC porting (haven't seen any back to back tests of RRC or RSP after porting).

 

oh...... well i can do that to.


mike

 

Got a brand new skunk2 racing mani if your interested. It like the RRC mani just bigger and wider port. Make mid and high hp 420 shipped....

 

^^Still have it?

 

Rbc is the way to go...

 

Compared to what? The RRC and RSP both make more power.

 

stock for stock (RRC vs RBC), RRC hands down if you don't want to do any porting to it (besides match porting to a larger TB) and if your'e looking to do a mostly internally stock engine setup besides the usual i/h/exh/ecu.

go RBC with some massaging if you want a little more power over a stock RRC.

RSP shows about the same gains as an RRC, its not worth getting imo and is expensive.

overall, RRC wins in the stock manifold dept with my own personal testing.

 

Just yesterday morning when I was at the dyno shop (Church) Daniel brought this subject up in the form of a question to me. He already knew the answer since he dyno tests these things all day long at least 6 days a week. So anyway, he asked me how much extra HP I figured could be had from all of the imaginable modifications anyone could do to an RBC, RRC, RSP, and that includes cutting them open, hogging them out, adding a bigger throttle body, and even changing the length of the stacks inside the RSP. I replied, "Maybe 3 or 4 ponies" and he said, "Yep, that's about the end of it no matter how much you spend".
So be advised, no matter how much you polish on these turds from Honda you're just throwing good money down the toilet, because the basic design of the manifold puts a finite limit on how much HP it'll produce.
The junk from Skunk won't do you any good either, those have been dyno tested repeatedly as well and the results are just about the same as the Honda manifolds.

 

I've said this repeatedly over on k20a.org but people don't listen...they've been so brainwashed that OEM manifolds can be ported for big gains. Some people even pay upwards of $500 for cnc porting! Lol

 

Isn't one of the commonly accepted definitions of insanity when the same thing is attempted over and over with the expectation of a different result?

 

so with that being said which manifold would you pick? or would you base it off which motor is being ran?

 

If you're looking for something that's cheap then any of them are a good choice, because they're all basically the same with extremely minor and pretty insignificant differences. But if you're looking toward making any significant HP increase then none of them are a good choice because their basic design negates that possibility. That's one of the big reasons I decided to design my own intake manifolds using 2nd order harmonic technology rather than 3rd order harmonics like Honda uses.

 

From runner and plenum design, to cutaway comparisons followed with dyno sheets:

https://honda-tech.com/forums/honda-civic-2006-2015-79/rbc-manifold-vs-rrc-manifold-2541002/

 

I find it pretty comical that someone trying to sell stock Honda RRC manifolds would use charts as proof of a HP gain from a dyno that's obviously in major malfunction mode. Data like that is totally invalid and needs to be thrown in the trash where it belongs. Just look at the torque curve, its bouncing from 135 lb ft to 225 lb ft over a span of just a couple hundred RPM and yet the HP curve doesn't register it at all. Time after time its been proven that there's no significant difference between the RBC and RRC in terms of HP production.

 

2nd that