JayWest

So as some of you may know, Randy (NaH2B) sent me a few of his intake manifolds to try out on my setup. My setup is a stock jdm H22 block, stock cast euro r head, pro1 cams, supertech valvetrain, and rmf header. Previously used a skunk2 intake manifold with a omni power 70-68mm tb matched with a stepped intake setup going from a 4” velocity stack to a 4” pipe, to 3.5” pipe, to 3” pipe. Car ran a best time of 11.52 @ 116 @ 1950lbs

Here is what Randy sent me to try out:



I also went and got a blox 76mm tb to use with these. The modified stock manifold is port matched to 76mm and the custom plenums use an adapter plate that is 76mm also.


All testing was done back to back, same day, same dyno. First made a few base pulls on the current setup (skunk2 mani). This is the average of those:



Then we swapped on the modified stock manifold and stock plenum with the 76mm tb. This pull was done using the same intake setup as mentioned above.



Then swapped out the 3” section of the intake for a 3.5”




Then added the .5” spacer to the stock plenum. Basically the same as without the spacer except a little more tq in the midrange, something that really wont make a difference for me.



Modified stock vs Modified stock with spacer
Modified stock is the red line and spacer is the blue



At this point we ran into a few issues getting the tb onto the adapter plate for the custom plenums. (something I should have test fitted before the dyno but messed up by not doing) and it was getting really late. After finally getting it setup, it was already like 1am. We only managed to do a few pulls with this plenum as it was clear that it was not right for my setup.

Here you can see the under hood plenum vs the modified stock manifold
modified stock is red and under hood is blue



After seeing that the previous setup didn’t work well for me, we decided not to run the ram air plenum but i did have to take a pic with it on lol




This is the skunk2 manifold vs the modified stock manifold. You can see the gains in the top end
skunk2 is blue and modified stock is red





Overall, the modified stock manifold setup does look like it will work out better than the skunk2. I chose not to run the spacer for now. I did run this manifold at yesterdays NSCRA event however i had some shifting issues so i really wasnt able to get any true results.



Tried to make this test as fair as possible to get true results. I have tested just about every “off the shelf” intake mani setup there is. Everything from the euro-r, to rbc, to skunk2. This stock manifold setup has had the best powerband with putting the peak power out a bit further than any other setup and also carrying that power longer.

Also, for those wondering, the power is down a bit from my previous numbers but there are a few things that may have factored in to that. Different days, temps, tires, oil used... The point of the test was just to see how these manifolds would compare to each other.

I was in no way paid or manipulated to “alter” the results. Im just like everyone else out there, I just want to find what works best. If you guys have any questions, im sure myself or Randy or my tuner Turbogixxer will be able to answer them.

heres a few pics from the dyno:

Mr. EG

Looks AWESOME! Where did you get that intake piping, just curious?

SL0WEGG

Nice work

mouab18c1

iTrader: (5)

Nice tests!

AllMtrRex

Thanks for spending the money/time to test out these manifolds. Only a few people on here are willing to do a legit test like this.(same day, same dyno etc.)

Although I would add beside everywhere you have "stock h22 manifold", "Nah2b Modified Stock h22 manifold". I know what you mean as well as others do I'm sure, but some people may actually think your using a 100% stock h22 manifold.

K7-1Ktrevor

good info. Im glad you posted this was any tuning done on each pull?

DDTECH

Jay, excellent testing.. Randy great up and coming work man

props to both of you guys.

NAH2B

Looks good Jason

depending on what rpm your seeing after each shift you may benefit from the added midrange w/ the spacer. thats a good bit of tq...

im thinking some shorter exhaust primaries will work wonders for that powerband.

very surprised to see the larger plenum lose top end but hold low/midrange, i thougt the opposite would have happened...hmm. what did afr's look like once you bolted it on?

JayWest

racepartssolutions.com
something like that

fixed, i was a little tired from putting the thread together. i knew i missed a few things but wanted to get it up. thanks for pointing that out

tuned each for a/f



ill have to check. i know some actually wanted more fuel than the others, not sure which ones off the top of my head. maybe Kenny (turbogixxer) will know and chime in

crazes

good stuff jay interesting on the tests. I will be tuning this weekend and doing the same but I will go from a euro-r to modified stock maniold. Wondering if it matters on the motor size since I have a bigger motor

N/A

JayWest

thats a little older. it HAD a ported head before, but bent some valves and went back to a stock head for the time being.

but yes, 10.6:1 using an oem head gasket. no milling

N/A

U plan on taking any of these to the strip?

JayWest

the stock plenum is staying on the car

as far as the custom plenums, unfortunately i dont think ill be going down the track with those. my work/school schedule is pretty packed and doesnt give me much time to test. i had a week off last week and managed to get the dyno testing in

i will be going to the track a few times between now and the next NSCRA event in may but its mostly to dial in and make minor adjustments, dont think ill be able to really get any intake mani testing done there.

MAX_CFM

What would happen If you put 2 OEM TB on it like this

that could be fun ...

N/A

Wouldn't that cause some kind of turbulence? Seem it would flow better into just one big one no?

EG1834

Vena Contracta like a ****!

MAX_CFM

I think it would work good ... each TB would split 2 runners

It would act like Itbs more than a Hemholtz style plenum probabaly

I would have to run it thru CFD I just dont have the time right now

Bserious

Speaking of Vena Contracta, it appears the Skunk2 was dyno'd with a 70mm opening, and others a 76mm?

MAX_CFM

haha very true .. it would converge down stream That was a rough drawing

I would probably have a tapered hat under each TB to help the air turn

zuptidi

I believe rosko did exaclty what you re talking about Brad. He gained an extra 10 tq but peak HP stayed the same to the euro r. Its in his build thread in the prelude section .

Turbogixxer

When we bolted on the stock ported one on with no spacer, it went lean (like 13.5-13.7). I riched it up and it picked up. With spacer was about the same.


I have been thinking about something like that for a while lol

when we first tested the s2, it had a 75mm. We borrowed it from a friend. We did not feel/see a difference in the larger TB.

SL0WEGG

I thought about this as well. Since it appears to.be pretty simple to design the plate for it.

2fastGSR

Dave Hickman ( douchebag) made an intake manifold adapter for the H manifold that allowed the use of 2 TBs just as you pictured it, Brad.

We had a few people come to get tuned with that set up but they never had a car that was running right haha.

If dont correctly, I would imagine it would work well. I know Randy has been contemplating an idea like that as well haha

JayWest

yup i was just about to mention the DH racing ones