Single throttle body and port injection

[reservoirdubs]

Has anyone/can anyone share their experience using a single IDF style throttle body on a centermount manifold with port injection in the end castings (like the CB ones)?

I'm looking for some real experience/hiccups/gotchas. How was performance? What was your combination?
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1960 Canadian Custom
1970 Double Cab
1972 Porsche 914

[kangaboy]

I have a 47mm single throttle body from a Hyundai with CB dual port end castings. Took me a little bit to tune it using Megasquirt, but runs great now. I have several sensors, Idle Air Control valve for cold starts, Wideband for tuning, and am also blowing through with a GT17 turbo off a Saab.

The single throttle body with port injection is super easy. You can even buy it as a kit...full bolt on and ready to go http://thedubshop.com/mexican-fuel-injection-package-with-ignition-type-1/. No linkage to dick with and any drawbacks to not having a dual TB setup over the heads is so miniscule that it's a moot point.
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-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE

[reservoirdubs]

Thanks for the reply. Did you have to build a plenum for this? What does your intake manifold look like? Any pics of your setup?
_________________
1960 Canadian Custom
1970 Double Cab
1972 Porsche 914

[kangaboy]

Yes I built a custom intake out of some 1 5/8" steel, and added a flange for the TB to sit on. You can check out my build over on ShopTalkForums
https://shoptalkforums.com/viewtopic.php?t=145462

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-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE

[Dale M.]

Don't think I would use a IDF style TB ... For single center mount a single TB would be easier to deal with....

Dale
_________________
“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.

"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ...

[reservoirdubs]

If its just flowing air, what would the difference/benefit be? My own thinking was that by using a single IDF, I can use linkage designed for the centermount that already exists.

I'm absolutely open to ideas and suggestions.
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1960 Canadian Custom
1970 Double Cab
1972 Porsche 914

[Ebel]

I’d been thinking about doing the same with a single idf manifold. it might flow more then a single throttle body. But there would be a lot of things that might change that. Cb Performance made a single idf fuel injection system and might still.

[Krochus]

I cover a bunch of this here.

https://www.thesamba.com/vw/forum/viewtopic.php?t=710794&highlight=progressive

Honestly it ended up being the hard way to do things. Now if you aren’t set on blowing through with a turbo you can get a progressive style CIS throttle body off a liquid cooled VW that will bolt to a progressive intake.

Honestly making the throttle cable work will be the simplest part of your build.
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1970 Turbo Baja Bug Turbaja 2165 t3/t4 Speeduino sequential EFI LS3 coil on plug ignition

1965 Chevy c30, Microsquirt turbo aluminum 5.3/nv4500

[Dale M.]

So you want to use a IDF TB that will cost you what maybe $300, plus manifold.... A $50-$60 e-bay TB off Jeep 2.5L (includes TPS, MAP and, IAC) will do same thing and all you have to do is fab up/open up center section which any good TIG welder can do for probably less than $100 and use dirct port injection end castings.......

https://www.ebay.com/itm/Throttle-Body-Throttle-Va...Sw1cdbrpnU

Dale
_________________
“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.

"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ...

[Onceler]

Here was my homemade plenum and ford escort TB on a 1641. The TB was off a 1.9L i think. It was just a tad too big, I was afraid my seat might break over time

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1972 Karmann Ghia

[NJ John]

I have a single IDF tb and intake with CB efi end castings. I've had them for over 15 years and plan on finally using them soon.
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[NJ John]

I have a single IDF tb and intake with CB efi end castings. I've had them for over 15 years and plan on finally using them soon.
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[Krochus]

Mine ended up being from a ford tempo

_________________
1970 Turbo Baja Bug Turbaja 2165 t3/t4 Speeduino sequential EFI LS3 coil on plug ignition

1965 Chevy c30, Microsquirt turbo aluminum 5.3/nv4500

[Krochus]

I cover a bunch of this here.

https://www.thesamba.com/vw/forum/viewtopic.php?t=710794&highlight=progressive

Honestly it ended up being the hard way to do things. Now if you aren’t set on blowing through with a turbo you can get a progressive style CIS throttle body off a liquid cooled VW that will bolt to a progressive intake.

Honestly making the throttle cable work will be the simplest part of your build.
_________________
1970 Turbo Baja Bug Turbaja 2165 t3/t4 Speeduino sequential EFI LS3 coil on plug ignition

1965 Chevy c30, Microsquirt turbo aluminum 5.3/nv4500

[Onceler]

I later swtched to oe german plenum and TB when I went blow thru,that was given to me. The Mexican setup is available too
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1972 Karmann Ghia

[clonebug]

You can push a lot of hp through a stock German 45mm TB.

The plenum throttle linkage sucks though.........I ended up building my own intake out of 2 inch and 1 5/8ths tubing since 1 5/8ths is a match for the CB stock style FI intakes. It makes it easier to slide the silicone connectors out of the way to remove the intake........Anything bigger and you have to beat a dent into the top of the right side tubing to clear the alternator housing.

An IDF style TB is going to sit pretty high with the intake and then adding a top hat will put it up there. It might be a little more challenging to plumb the pressure side. You "might" see a little sensitivity on throttle tip in due to the duel throttle plates but it might depend on what size engine you start with.
If it has a TPS on it then you are good to go.

This is what it looked like when I was going to try to blow through a single IDF when I first started on my turbo.

A little too tall....

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[reservoirdubs]

Thanks for all the responses. I have zero interest in boosting this car. I have all the parts (minus end castings with bungs) to put this together. What is missing is whether or not (and if it does work, how) the centermount performs vs. a dual itb setup.
_________________
1960 Canadian Custom
1970 Double Cab
1972 Porsche 914

[reservoirdubs]

Thanks for all the responses. I have zero interest in boosting this car. I have all the parts (minus end castings with bungs) to put this together. What is missing is whether or not (and if it does work, how) the centermount performs vs. a dual itb setup.
_________________
1960 Canadian Custom
1970 Double Cab
1972 Porsche 914

[clonebug]

[Onceler]

Perform as in peak HP? Ease of install? Tuning? Cost? Drive ability? Carbs can make the same HP
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1972 Karmann Ghia