RBC vs RSP(euro type R) intake manifold

394416 Views 837 Replies 123 Participants Last post by LotusElise, 4 mo ago

mike323

Discussion Starter · Dec 15, 2007

I would like to know if anybody got their hands on a RSP intake manifold? Did you test it against a RBC intake manifold?

The RSP intake manifold is a three piece design that has much longer runners (about 2.5" longer) and a slightly bigger plenum than the RBC intake manifold. It is basically an improved design of the RBB (TSX) manifold, since it produces great top end power as well.

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muzzle

· #661 · Nov 22, 2015 (Edited)

finally i've almost finished to build my rsp intake manifold + 1cm extra aluminium gasket for increasing capacity, skunk2 70mm b series throttle body

i hope i'll have some great numbers

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Mixwell

· #662 · Dec 7, 2015

if i wanted more power on the higher end of the RPM range, would i want longer or shorter stacks?

AWH

· #663 · Dec 7, 2015

Mixwell said:
if i wanted more power on the higher end of the RPM range, would i want longer or shorter stacks?

Shorter.

Mixwell

· #664 · Dec 7, 2015

AWH said:
Shorter.

thanks AWH. keeping this in mind if i keep this manifold.

stockish k20a2 stops making power around 7600-7800 with an unmolested RSP.

(pay no mind to the crossover, i'm adjusting that. everything up top is tuned.)

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AWH

· #665 · Dec 7, 2015

Mixwell said:
thanks AWH. keeping this in mind if i keep this manifold.

stockish k20a2 stops making power around 7600-7800 with an unmolested RSP.

(pay no mind to the crossover, i'm adjusting that. everything up top is tuned.)

That power peak is likely less the manifold and more likely the stock A2 cams.

More cam duration will also move the peak to the right, and also up.

It's all about the package synergy. RSP intake is designed for slightly bigger cams than K20A2, and slightly more compression. For the cost of custom intake stacks, you'd be better off with bigger cams. Even a set of DIC's should easily outperform the stock RSX-S cams in a 2-liter motor.

But we're getting off-topic now... :scared:

PS: FWIW, I'm making 250 Dynojet on a built 2-liter...Kelford B, 13:1, Pro TSX head, RRC...peak power at around 8300. So that gives you an idea what the upper limit is within a reasonable budget.

Mixwell

· #666 · Dec 7, 2015

AWH said:
That power peak is likely less the manifold and more likely the stock A2 cams.

More cam duration will also move the peak to the right, and also up.

It's all about the package synergy. RSP intake is designed for slightly bigger cams than K20A2, and slightly more compression. For the cost of custom intake stacks, you'd be better off with bigger cams. Even a set of DIC's should easily outperform the stock RSX-S cams in a 2-liter motor.

But we're getting off-topic now... :scared:

PS: FWIW, I'm making 250 Dynojet on a built 2-liter...Kelford B, 13:1, Pro TSX head, RRC...peak power at around 8300. So that gives you an idea what the upper limit is within a reasonable budget.

that's the plan with the head porting and compression. thanks for the insight

relaxed

· #667 · Dec 8, 2015

With the right header and exhaust setup, you should be able to go higher than 8300 for peak power on a k20

AWH said:
PS: FWIW, I'm making 250 Dynojet on a built 2-liter...Kelford B, 13:1, Pro TSX head, RRC...peak power at around 8300. So that gives you an idea what the upper limit is within a reasonable budget.

AWH

· #668 · Dec 8, 2015

relaxed said:
With the right header and exhaust setup, you should be able to go higher than 8300 for peak power on a k20

No doubt, but that wasn't the goal for that motor. I use that one for autocross where a wide flat torque band is needed. Thus the use of the Pro TSX instead of Pro 156. The PRB port would have pushed it to higher RPM.

BlackNDecker

· #669 · Dec 10, 2015

AWH said:
PS: FWIW, I'm making 250 Dynojet on a built 2-liter...Kelford B, 13:1, Pro TSX head, RRC...peak power at around 8300. So that gives you an idea what the upper limit is within a reasonable budget.

At the risk of only comparing a single number, I feel like 250 hp is a little low for those mods. What header are you using? Several people on 8thcvic have made 245-250 hp on a stock block with Toda A3 and DC 2.2 cams....without a ported head.

It may just be that the smaller motors don't benefit from ported heads or a modest bump in compression.

AWH

· #670 · Dec 10, 2015

BlackNDecker said:
At the risk of only comparing a single number, I feel like 250 hp is a little low for those mods. What header are you using? Several people on 8thcvic have made 245-250 hp on a stock block with Toda A3 and DC 2.2 cams....without a ported head.

It may just be that the smaller motors don't benefit from ported heads or a modest bump in compression.

Likely more of a dyno comparison issue. I suspect those "bigger" #'s are on Dynapaks and maybe even at Church's. Mine was on a Dynojet, though it was generating some weird spikes that day (since fixed, they say). I'm trying to get back there to get cleaner graphs but the shop moved recently and they are all jammed up trying to catch up on tuning business. That motor is coming out of the car anyway.

FWIW, that car has a real Hytech header, 3" exhaust, RRC w/70mm. My track motors (built K24 Franks) make 300 on that exact setup in the same car with same mods (same cams/compression) using ported PRB heads. I also have an unported Frank that makes 285 in that car.

6spd_EK

· #671 · Dec 28, 2015

Couple of updated pics. I can't wait to test... In the spring :thud: time to get going on the centerfeed

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BlackNDecker

· #672 · Dec 28, 2015 (Edited)

Very nice...was just thinking about you and this project the other day. I was also thinking about those 212s I got from you that I still need to install.

LotusElise

· #673 · Dec 28, 2015

Steps forward

Hi 6spd_EK, thanks for updating your plenum investigation (hopefully testing) here.

6spd_EK said:
...time to get going on the centerfeed...

Long time awaited

! Maybe my NaFI'd IM with it's unique runner balancing technique is ready for tuning before yours...as it seems to be the Winter's at your place are longer that those we have here

muzzle

· #674 · Dec 29, 2015

6spd_EK said:
Couple of updated pics. I can't wait to test... In the spring :thud: time to get going on the centerfeed

http://i48.photobucket.com/albums/f228/6spd_ek/Mobile%20Uploads/IMG_0032_zpsmnrhnjhz.jpg[/IM]

[IMG]http://i48.photobucket.com/albums/f228/6spd_ek/Mobile%20Uploads/IMG_0019_zps40iopko9.jpg[/IM][/QUOTE]

have u tried to put it on engine, i had some problems with mine because of alternator, i had to shave some of it :D
butnow its inside ;)

[img]http://s10.postimg.org/hah2kbquh/12374967_10205471181323242_3683468772012384281_o.jpg

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LotusElise

· #675 · Dec 30, 2015

Just for my curiousity

muzzle said:
have u tried to put it on engine, i had some problems with mine because of alternator,...

Hi Muzzle, which alternator part no. is installed in your enginebay? And is it installed like stock?

Markus

muzzle

· #676 · Dec 30, 2015

Its in its original place, but ive used a 10mm aluminium gasket to increase plenum, thats why the back of intake manifold was touching alternator

LotusElise

· #677 · Dec 30, 2015

muzzle said:
Its in its original place, but ive used a 10mm aluminium gasket to increase plenum, thats why the back of intake manifold was touching alternator

Thanks for clarification Muzzle, I didn't see it...just thought something looks different, can't be as every alternator used in Europe fit's to the RSP IM...was confused

.

So you did color the gasket? Is it a PTFE (Teflon) or...?

muzzle

· #678 · Dec 30, 2015

LotusElise said:
Thanks for clarification Muzzle, I didn't see it...just thought something looks different, can't be as every alternator used in Europe fit's to the RSP IM...was confused .

So you did color the gasket? Is it a PTFE (Teflon) or...?

its from aluminum , i do not know, why it has a little bit different color, maybe it was painted before cutting

finally i've almost finished to build my rsp intake manifold + 1cm extra aluminum gasket for increasing capacity, skunk2 70mm b series throttle body

i hope i'll have some great numbers

6spd_EK

· #679 · Jan 2, 2016

Thanks for the heads up! But I cheat - I already have ktuned idler kit that relocates the alternator lower :silly:

JeremyK20a

· #680 · Jan 31, 2016

My buddies euro r he just bought read 180 psi in all cylinders its been sitting for awhile and the motors cold is that a bad reading?

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