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?? |
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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 |
Nov 28 2021, 11:08 AM
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#21
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Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
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! |
JamesM |
Nov 30 2021, 06:14 PM
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#22
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Senior Member Group: Members Posts: 1,875 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
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. |
ChrisFoley |
Nov 30 2021, 08:07 PM
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#23
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I am Tangerine Racing Group: Members Posts: 7,894 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
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? |
VaccaRabite |
Dec 1 2021, 09:41 AM
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#24
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En Garde! Group: Admin Posts: 13,407 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
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 |
VaccaRabite |
Dec 1 2021, 09:44 AM
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#25
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En Garde! Group: Admin Posts: 13,407 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
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 |
Shivers |
Dec 1 2021, 10:00 AM
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#26
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Senior Member Group: Members Posts: 2,292 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
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? |
VaccaRabite |
Dec 1 2021, 10:10 AM
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#27
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En Garde! Group: Admin Posts: 13,407 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
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 |
GregAmy |
Dec 1 2021, 10:12 AM
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#28
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Advanced Member Group: Members Posts: 2,262 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
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Montreal914 |
Dec 1 2021, 11:54 AM
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#29
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Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
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... |
Montreal914 |
Dec 1 2021, 11:55 AM
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#30
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Senior Member Group: Members Posts: 1,532 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
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. |
Rand |
Dec 1 2021, 12:53 PM
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#31
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
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. |
Rand |
Dec 1 2021, 01:09 PM
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#32
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Sigh. Watching to see where it goes.
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GregAmy |
Dec 1 2021, 01:51 PM
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#33
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Advanced Member Group: Members Posts: 2,262 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
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. |
DRPHIL914 |
Dec 1 2021, 02:20 PM
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#34
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Dr. Phil Group: Members Posts: 5,753 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
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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