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> Is anyone still enlarging the diameter of our throttle bodies, Wouldn't it be nice to add a bit of power with a little more air??
Montreal914
post Nov 28 2021, 11:08 AM
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QUOTE(JamesM @ Nov 27 2021, 09:11 PM) *


Throttle body is 2.1 vanagon, the plenum and runners though are 74 1.8 parts. Only modification made was using a tailpipe expander to open up the plenum to match the 50mm vanagon TB, and swapping the throttle arm from a 1.8 throttle body over to the vanagon throttle body for proper throttle cable orientation.

Using the Vanagon plenum is a bit more complicated as no 914 intake runners are a direct match to it.


And this is on a 2056? What kind of cam/head setup?
Thanks!
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JamesM
post Nov 30 2021, 06:14 PM
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QUOTE(Montreal914 @ Nov 28 2021, 10:08 AM) *

QUOTE(JamesM @ Nov 27 2021, 09:11 PM) *


Throttle body is 2.1 vanagon, the plenum and runners though are 74 1.8 parts. Only modification made was using a tailpipe expander to open up the plenum to match the 50mm vanagon TB, and swapping the throttle arm from a 1.8 throttle body over to the vanagon throttle body for proper throttle cable orientation.

Using the Vanagon plenum is a bit more complicated as no 914 intake runners are a direct match to it.


And this is on a 2056? What kind of cam/head setup?
Thanks!


yeah on a 2056, I dont have the specifics as I didnt build it but its far from stock. AMC 1.8 heads with oversized SS valves, port work, and custom chambers by EMW. EMW cam of some sort. Motor really come alive 3700+ rpm

Going to be swapping it again for the 52mm throttle body over the winter is its still wanting more air.
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ChrisFoley
post Nov 30 2021, 08:07 PM
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QUOTE(Porschef @ Nov 28 2021, 11:46 AM) *

I think Mr Kona had a thread on this, well done.

Chris, I have the enlarged throttle body on my car that you did years ago, it definitely made a difference on the 2056 (IMG:style_emoticons/default/beerchug.gif)

Andy's TB?
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VaccaRabite
post Dec 1 2021, 09:41 AM
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I had a thread with a blow by blow write up on changing the TB to the GO-Westy unit.

On my 2056 the tuning showed it made a difference.

If you do this one of the things you HAVE to do is enlarge the horn on the plenum. Its thin metal and easy to do with an exhaust expander.

Zach
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VaccaRabite
post Dec 1 2021, 09:44 AM
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http://www.914world.com/bbs2/index.php?act...=2&t=353039

Here is my thread on moving from the stock TB to the GO-Westy unit.
It shows all the steps needed to convert the unit (its EASY!)

It also has my home built smoke tester for testing the intake.

Bear in mind when I did this I id it for my Microsquirt 2056. So my TPS is a little different then the L-Jet unit that started on the 1.8, and may be a tad different then the TPS you use on your machine (but probably not, and its still super simple to make the bracket.)

Zach
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Shivers
post Dec 1 2021, 10:00 AM
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QUOTE(VaccaRabite @ Dec 1 2021, 07:44 AM) *

http://www.914world.com/bbs2/index.php?act...=2&t=353039

Here is my thread on moving from the stock TB to the GO-Westy unit.
It shows all the steps needed to convert the unit (its EASY!)

It also has my home built smoke tester for testing the intake.

Bear in mind when I did this I id it for my Microsquirt 2056. So my TPS is a little different then the L-Jet unit that started on the 1.8, and may be a tad different then the TPS you use on your machine (but probably not, and its still super simple to make the bracket.)

Zach


That was a good write up, and a clever idea on addressing the horn. Did it come out looking pretty stock?
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VaccaRabite
post Dec 1 2021, 10:10 AM
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QUOTE(Shivers @ Dec 1 2021, 11:00 AM) *



That was a good write up, and a clever idea on addressing the horn. Did it come out looking pretty stock?


There is not a lot in my engine bay that looks stock, aside from the 1.8 airbox/plenum/intake runners. Once you get past that, its ALL modified.

That said, the TB is pretty buried on a 914, so you never see it either way unless you go spelunking to find it. And being black it hides even more.


Zach
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GregAmy
post Dec 1 2021, 10:12 AM
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QUOTE(VaccaRabite @ Dec 1 2021, 10:44 AM) *

Here is my thread on moving from the stock TB to the GO-Westy unit.

So now I'm wondering out loud how well that would work on a 2L plenum...
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Montreal914
post Dec 1 2021, 11:54 AM
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QUOTE(GregAmy @ Dec 1 2021, 08:12 AM) *

QUOTE(VaccaRabite @ Dec 1 2021, 10:44 AM) *

Here is my thread on moving from the stock TB to the GO-Westy unit.

So now I'm wondering out loud how well that would work on a 2L plenum...


Maybe with an adaptor plate between the plenum and the TB? (IMG:style_emoticons/default/idea.gif) Just going by visual memory here...
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Montreal914
post Dec 1 2021, 11:55 AM
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QUOTE(Montreal914 @ Dec 1 2021, 09:54 AM) *

QUOTE(GregAmy @ Dec 1 2021, 08:12 AM) *

QUOTE(VaccaRabite @ Dec 1 2021, 10:44 AM) *

Here is my thread on moving from the stock TB to the GO-Westy unit.

So now I'm wondering out loud how well that would work on a 2L plenum...


Maybe with an adaptor plate between the plenum and the TB? (IMG:style_emoticons/default/idea.gif) Just going by visual memory here... not sure how large the 2.0 plenum opening is though.

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Rand
post Dec 1 2021, 12:53 PM
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Late to the conversation. But I remember talking about different plenums and ran an idea that got Jake's approval back in the day, swapping an older version. It's all talk until we see what works.

Bigger isn't always better. If you can't measure the flow and the related combustion, it's all guesswork. Bigger inlet doesn't necessarily mean more air flow where it's needed. In fact smaller can be more effective. Too many factors.
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Rand
post Dec 1 2021, 01:09 PM
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Sigh. Watching to see where it goes.
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GregAmy
post Dec 1 2021, 01:51 PM
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QUOTE(Rand @ Dec 1 2021, 01:53 PM) *
Bigger isn't always better. If you can't measure the flow and the related combustion, it's all guesswork. Bigger inlet doesn't necessarily mean more air flow where it's needed. In fact smaller can be more effective. Too many factors.

Concur.

But with my Microsquirt setup, I can infer changes in airflow by swapping TBs, keeping the target AFR tables the same, and seeing what the fuel (VE) does. Significant changes in fueling, either way, imply significant changes in airflow.

First step is committing to spending $300 on a TB and then (likely un-return-ably) modifying my plenum with the hopes and dreams it'll matter. Can't see that happening soon.
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DRPHIL914
post Dec 1 2021, 02:20 PM
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QUOTE(GregAmy @ Dec 1 2021, 11:12 AM) *

QUOTE(VaccaRabite @ Dec 1 2021, 10:44 AM) *

Here is my thread on moving from the stock TB to the GO-Westy unit.

So now I'm wondering out loud how well that would work on a 2L plenum...


@gregamy
@vaccarabite

i posted on the other thread but was wondering the same thing.

(IMG:style_emoticons/default/popcorn[1].gif)

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