I'm looking into replacing the throttle body on my EM1. Figured it might be worth replacing along with all the other changes for my turbo build. Will be looking to make 350-400whp and am using an inline pro 2.5" charge pipe kit with an AEBS intake manifold.

The AEBS has a 65mm inlet so I was thinking getting something close like a 66mm throttle body would help the transition from the from the charge piping.

So what would you recommend? Charge pipe @ 63.5mm (2.5") -> throttle? -> 65mm intake inlet. I'm interested in both size recommendations as well as manufacture recommendations.

I would prefer something billet/polished just to match what I'll have going on under the hood but quality first.

Thanks!

Edit: FWIW I've been leaning towards the Blox Polished 66mm which retails for around $280 (says it includes a TPS as well, but I'm skeptical)

 

I'd go for the Skunk2 Alpha for either 66mm or 70mm. Mainly because they use nice brass plate and not aluminum to prevent binding. Plus, they have a nice OEM fine idle screw.

There's even a video on it if you search for it outside of Honda-Tech

 

As another afterthought I know the stock throttle body is 60mm. How much improvement does one get by replacing the throttle body? Is it even worth it?

I know for NA builds it's kinda a moot point unless you are really pushing the limits of the motor (high compression, cams, etc. etc.) and trying to squeeze every little HP possible. I was under the impression for a turbo application there was a greater difference/improvement by matching the TB to the intake inlet.

Please correct me if I'm wrong. I'm happy to save money if it would be thrown away by upgrading

 

For snappy response, sure. Peak power, not so much. Most of us over 400whp upgrade from the OEM, if that's of any comfort.

 

Good to know. Thanks!

One reason I was looking at the Blox is that it appears to have a vacuum thread built into the top of the throttle body (looks like a 90 deg elbow comes with it as well). I figured this would be a nice clean place to run vacuum lines to the wastegate provided it is on the correct side of the throttle plate. I'm trying to dig up information to verify this.

The Blox also appears to have been updated with a brass throttle plate as well.

I'll look into the Skunk2 Throttle Bodies too.

Edit: Here's a picture to what I am referring to about the vacuum port.

 

That's the billet series. leave that out of the equation. I had a writeup between the blox and the Skunk2 Alpha, but the thread was trashed. you can search the archives on here, but for the sake of keeping this clean, you'll need to find that for yourself.

 

Removed for TheShodan… Search if you want to read the thread. It's easy to find.

 

uhhhhh. The port on the top is not for a vac source, atleast it "shouldn't" be. That is for your MAP sensor. Unless the MAP sensor boss is on the bottom.

 

I think it's a bad picture… The 90 deg elbow on the top sticking out is what I believe is the vacuum port. The MAP sensor part is just behind it and to the right (flat 3 holes, on larger in the middle and two screw holes).

I'll have to find the other picture that showed the 90 deg elbow gone and a block off pin instead.

Edit: here's another look. first pick shows the 90 deg elbow gone and open. in the other pics you can see the elbow in the surrounding parts. I just can't tell from the pics if the threaded port is before or after the throttle plate.

http://www.jhpusa.com/store/pc/viewP...idcategory=617

Edit 2: From the Blox website. Here's a few better pictures. It looks like it's on the intake arm side of the throttle body. Sucks cause that means it would only be useful for the wastegate line if not planning to tap the turbo housing.

http://bloxracing.com/shop/index.php...product_id=106

 

I posted the link above but yeah the thread seemed to turn into a pissing contest rather quick

Reading through it though it seems I'm out of luck with Skunk2 if I am interested in a billet one due to the sticking issues. I know BDL makes some billet parts and there has to be a few other brands that make nice TBs. I'll do some more searching and see what I can find.

Anyone have experience with BDL's TBs??

 

Your priority should be
1) Function
2) Form

In that order.. If it happens to be billet, great.. but make sure it works first.
BDLs aren't bad at all, just get it new if going that route


Please do me a favor and un-link that old thread. No one should or needs to read it anymore. i can always create a new one another time.. Let the past be the past.

 

Absolutely. I'm not wishing to get something that doesn't work. I'm sure there is something out there that fits what I'm looking for that's why I'm asking

Removed the link for you. Although I didn't think it was a bad read to be honest despite the way the commentary turned in the end.

 

I know, right?.. But don't worry, I'll re-write it again in another format another time, I kept a copy of it.

Try the BDL, but if not, don't worry about the Billet stuff, and concentrate on the function. Skunk2 Alpha does the job just fine and is like OEM to install.

 

So after a ton of reading and seeing everyone complain about aftermarket throttle bodies sticking (BLD, Skunk2, Blox, etc. etc.) I've found a 68mm Polished Professional Products. This is the one Shodan originally wanted this from your initial write up. It seems people had good luck with this or just the Omni.

I'll settle for this at $162 shipped. These are in deed hard to find other than direct from Professional Products/AEBS @ $200. I'll give this a shot and let people know how it goes.

 

Hehe. You gotta remember what I wrote about that one, too, and that I removed it for the ALPHA series after the fact (which was the beginning of the "stink"). The Skunk2 billet was the style that sticks, not the Alpha. Plus, those have no fine idle screw, which, depending upon the camshaft you use might be in handy.

Just one last thing to think about when you make that final decision.

 

Little late to the party but may I suggest OEM sent here: http://www.maxbore.com/

It's what I did and I'm sitting at 484whp. I have never had a problem with the TB and it's been on the car for about 8 years.

 

The Professional Products one I ordered got refunded. Out of stock and not expected to be in for 4-6 weeks. I guess I can wait or shop around for more options.

Thanks 1158, I'll look into that as another option.

 

I've found the billet throttle bodies tend to have more problems with the plate sticking and the "cast" style throttle bodes are usually good.

 

I have a 74mm billet blox tb and yea it does stick but only occasionally and only after it sits for a while. I tap the gas pedal and it breaks loose immediately. I think a lot of people think that they get stuck open which i've never seen. But yea, i've heard that the cast throttle bodys are pretty good and don't stick. Can't beat their price either.