I SAID GOOD DAY.

 

Yup, that's about the response I was expecting. The crickets are telling me "Stay OEM!"

 

i have blox 68mm cast units that will bolt up and work well PM me for pricing

 

^^ agree

 

Wow. The only responses I get are posts and PMs from people trying to pawn their **** off on me. I'm pretty sure I posted this in a TECH forum, not the classified forum. If the post title was "WTB: 68mm tb" then maybe I'd be interested in your items for sale. But considering that a) Blox is junk which I would never bolt onto my car and b) 68mm is far too large, I think I'll have to pass on the offer.

Maybe I should clarify. I'm NOT interested in any of the crap you people have to sell. I'm interested in learning about proper throttle body sizing, and which particular brand would suit me best. I obviously don't have all the answers (hence the thread), but I'm 99% sure that I don't want anything larger than 64mm to match my charge piping. 68mm would shrink the step from throttle body to plenum to almost nothing, thus diminishing the anti-reversion properties of the manifold. And not only that, but I have a feeling that the 2.5" coupler (63.5mm) on my charge pipes wouldn't easily fit over a 68mm tb opening (which most likely has a beaded lip).

I'm not looking to lose intake velocity here, I"m looking to minimize the cold-side restrictions.

 

You know that kinda attitude wont get you very far around here.

 

My "attitude" is simply that I don't appreciate being solicited in a non-classified forum. It's a tech forum and I expect tech responses, not two separate responses from different people trying to unload their shitty 68mm throttle bodies on me. Not only did I NOT receive any useful tech input, but the solicited offerings, which are clearly unfit for my application, will no doubt hinder performance. You could at least put some effort into your pitch and claim that the increase in plenum volume from a 68mm tb would offset the reduced intake air velocity.

I'm not really sure what "going far on this forum" entails anyway. There was once a time in this forum's history when unbiased Honda enthusiasts would actually read your posts and return useful, helpful, well thought-out responses. Nowadays, in this post B.B. buyout era, the input simply comes from the few pesky salesman who were able to stick around after the transition because they're able to afford the astronomical hike in sponsor fees. And by golly, if they're going to continue to pay the outrageous fees just to attain "sponsor" status, then they're for damn sure going to get their money's worth out of it, by plastering their product offerings anywhere they can.

It's no surprise why the forum traffic took a spectacular dive in mid 2008 and has yet to recover. Really, what's the point of coming here anymore? At present, the forum is about half as useful as Google.

Good day sir(s). Enjoy your banner ads and sales pitches.

 

BYE!!!!!

 

Well, there seems to be alot of crap going on in here. But to answer your question, a stock throttle body would probably work for most any application you'd use it for, but if you wish to go bigger, stock B series throttle bodies are bigger and will work great as well. Throttle body size is the last part of a build I'd worry about. You're likely to be limited by something else before a throttle body.

 

haha i think he sounds like willie wonka "GOOD DAY SIR"

 

Digs thru the bullsh!t and attitude to ask, what is your setup? Manifold, goals, etc. TO properly answer the question.

 

So this got inexplicably bumped after a week, and now the responses are coming in?? This place sure is weird.

But as long as it's salvageable, here's the gist of the original post:
- Engine is a D16Y8
- I absolutely need to buy a tb
- I don't care what it costs
- My charge pipes are 2.5" (~64mm).
- The tb flange on my intake manifold is huge and will accept any size tb.

I believe those are the important facts. The questions I asked were:
- Would an OEM Acura unit be better than an aftermarket Civic unit?
- What is the best aftermarket brand?
- What needs to be modified to retrofit a GSR or ITR tb onto my d-series engine?
- Would 64mm be the ideal size, since it matches my charge pipes?

 

See thats better.
What you just wrote should have been what you wrote that first time.
And you didnt.


An OEM Acura unit (type r) is the only one (i think) that is bigger than an OEM B series throttle body.
So far skunk 2 is the best A/M company, I have heard they have fixed the sticking issue with this new batch.
A B series T/B should just bolt right up to your manifold.
64mm might be a little to big depending on the rest of your setup.

 

I guess I don't understand how the rest of my setup is relevant. Just considering the 64mm charge pipes, wouldn't any tb smaller than 64mm simply be a performance-hindering bottleneck?

The OEM y8 tb opening is 56mm btw.

 

It seems as though YOU want a 64mm throttle body. Spoolin supplies/builds a lot of turbo vehicles that put out a lot of good numbers. I've never bought anything from them, but with their reptutation, I wouldn't hesitate to. You wanted a recommendation, and he gave you one. It just so happens they can supply you with one.

If you want some flow rates, perhaps some of the physics gurus could chime in and help you out with that.

Have you considered getting an OE throttle body that is close to the size of your charge piping and port it/match it to your intake? That seems to me that it would increase laminar flow into the intake.. My $0.02...

 

Just because the charge pipes are that size doesnt mean the t/b needs to be that size.
If you have the right reducer it should be fine.

 

I am not telling you to use my services. I have an OBD1 integra TB that I bored to 64mm.
I also enlarged the manifold opening to 64mm. I thinik there is no better quality TB out there than a honda OEM TB. I have seen and repaired quite a few aftermarket TBs and I can tell you, for longevity, you can't beat OEM.

If you can get an Acura CL TB then you are set to go. Those are 64mm and use the same flange as a B series TB. The only issue can be the IACV or vacuum ports.

 

I'm suggesting 64mm because it makes sense, and nobody is providing any insight at all as to which size is actually best. I'm not interested in what "will work" or what "will make power," I want what is actually best. My stock 56mm "makes power" too, but I don't think it's the best scenario. I can get any tb I want for free, so I'm trying to find the BEST solution. It seems that no one has ever put enough thought into it to determine ideal tb sizing.

Anyway, I have considered you, Maxbore. One thing I worried about though was the sealing of the butterfly plate. I'd go OEM to keep the perfect seal of the plate and not have to worry about the plate screws coming loose, or I'd go aftermarket to get a large, shiny unit that would probably have a less perfect seal and a worrisome plate design. The service you offer seems like the worst of both worlds, because you're still limited to the smaller size, yet you also get the cheap plate with the worrisome screws.


Also, my IACV is mounted on the firewall, so that's not a concern. And I don't have any coolant lines going through the tb. All I need on the tb is a spot for the map sensor. And the opening on my intake manifold is gigantic, so I could use any size tb and not have to worry about port-matching. The opening is probably larger than 80mm.

 

This is from a few years ago and nearly everything is changed now, but the IM is the same and you can see the IACV is mounted on the firewall with a small breather filter on it.

 

Why is the inlet so big on the manifold.
Wouldnt that be an issue?
Also OEM is great, I have a holley and I hate it.
The damn tps wont set right the throttle plate screws keep coming loose causing it to stick, I just hate it.
So im prolly just gonna get a CL one like maxbore said.

 

to me the best size would be the size that is not a restriction with the maximum amount of airflow the system can flow. there was a post on here about max airflow for pipe diameter. have to search for that. i would match my TB size to my charge piping if I "needed" a TB. granted of course the charge pipe is big enough to flow the amount of air the engine system can flow.

 

I agree! Almost every aftermarket TB I have handled or installed has had major flaws and was not comparable in build quality to oem.

 

This was the exact thread I had in my mind, I came across it some time ago when researching different intercooler piping sizes, wish I could find it.

 

https://honda-tech.com/forums/forced-induction-16/airflow-velocity-different-intercooler-piping-diameters-2-0-2-25-2-5-2-75-3-0-inches-1202591/

 

^that'd be the one.