OMG THE GOGGLES

iTrader: (7)

I am considering going with a larger throttlebody, and curious if it would be a waste of the $99 they cost. It is an affordable upgraded throttle body, however, I am curious if 70mm is too big for those who have gotten to play around with and dyno various TB's on the Bseries through the years. (the Skunk2 manifold would be port matched if purchased)

Here are specs of engine. No port/polish.

GSR head
Supertech flatface valves/dual valvesprings
Crower chromoly retainers
Rocket M22X cams
Skunk2 pro intake mani
Benen fuel rail
RC 550cc injectors
OEM ITR or OMNIPOWER Throttlebody
junk but now 10x better after made into 1pc hytech rep header
3in stainless exhaust
3in Stainless Intake arm to velocity stack w/ filter.

GSR Block
81.5 bore
Supertech forged 11.6:1 pistons
Eagle rods
OEM Honda Bearings

flesh199

A oem is good but i would like to run a 70mm tb if i were you.I run a 70mm omni tb in the past with great succes.

2k.civic.si

omni

Untengijutsu

70mm, you will see power gain all across the powerband with it.
Also consider a tuned intake arm (diameter and lengh) with the TB.

88Hatchy

Maxbore ITR

2k.civic.si

Maxbore are you kidding me? They can only take a ITR TB out to 65mm at the plate and charges $105....you can buy a omni thats 70mm at the plate for $99 shipped.

Uncle Dave

Omni but I would use the 68mm unit for the 1800 engine,I have built a few of the engine combo's like yours and they make nice solid power,the M22x was a great choice of cam for that engine of yours.

N/A

wEaK Squad *ATL*

iTrader: (2)

You'll have to port match the skunk2 opening to the throttle body.

OMG THE GOGGLES

iTrader: (7)

Yea, I had a maxbore GSR TB before that I had sold on here. Omni is best bang for the buck for 99 bucks.

We will be building a stainless intake arm special for it with a velocity stack.

The Ogre

sad thing about omni's is they taper.

SR20S13

buy both and test it on the dyno or at the track only real way to know

jaylivfortyfive

The tapering is a positive thing, it increases flow speed. I would assume that is why Omniman purposefully had 1000s of them cast this way.

OMG THE GOGGLES

iTrader: (7)

I actually plan to taper the Intake manifold's opening as well instead of just a straight shot. I would match the edge to the 68/70mm, and then taper larger to the plenum. Simple stupid stuff that used to make slight differences in the past instead of just going at it straight. I remember being shown this years ago.

And also, Maxbore has a taper process as well. That is how he can make a max opening that is larger than the portion which hits the intake mani. The lip which keeps your stock intake arm on is how he makes the most out of the metal that is there.

88Hatchy

So, you're saying that Omni makes better quality parts than Honda? Doubtful.

wEaK Squad *ATL*

iTrader: (2)

The difference is Honda would build for gas mileage and efficiencey

The Ogre

Im aware of this, just didn't know the same idea applied to a TB.

jaylivfortyfive

You would want the larger size on the intake tube side and tapered down at the plate (where it connects to the intake manifold). If you go the other way you will decrease the velocity to which air enters the manifold.

Natural Aspirations

FYI the Omni throttle body is 68mm.... It's kinda misleading and I'm pretty sure it's the same manufacturer as the PP throttle body just a little cheaper.

nels00n

they have the omni in 68 or 70mm.

Natural Aspirations

If you read the fine print those are inlet sizes.

PyroProblem

Id look at your map sensor readings before investing in a larger throttle body.
If you still pulling vacuum at WOT, then a larger TB might be beneficial...
If your at atmospheric pressure at WOT, then I dont see a larger TB helping really...
my 2 cents..

nels00n

good eye sir did not see that.

the 68 are still good though.

*Taper bore specs are 69mm inlet down to 68mm outlet

its the 70mm like you said lol

* Taper bore specs are 70mm inlet down to 69mm outlet

The Ogre

Yes i see that. Idk i know someone who had this omni "70mm" has a 4"-3.5"-3" intake setup and is now switching to a 70mm straight through...

jdmH2Bek4

iTrader: (1)

70mm omni i got one on my motor idk but mines whistles when it hits 3k rpm lol but feel that good power tho..