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LS1 ITB ?'s


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Okay, I've been working on my LS1 swap for a while (actually just collecting parts) and I came across a video for ITB's on a Holden with an LS2. I've been playing around with some sand casting and such so I would be able to cast my own manifold. What my question is, how should I do the throttle bodies either carbed or FI? I've been looking at Weber Carbs and running them, which isn't a bad option. I've also been looking at used motorcycle Throttle bodies and possibly running them. What I don't know is what size (mm) would be sufficient to power a mild LS1? You can get weber 42mm carbs for fairly inexpensive but is a 42mm enough to power a V8? I'm welcome to any suggestions for building an ITB setup.

 

Here is the link to the holden: http://users3.ev1.net/~black_ops/video/242-106.mpg

 

Thanks a lot,

 

Tyson

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Yeah, I've been looking at the Fuel injection throttle bodies, but of course there is no cost listed. Depending on cost they might work out, but I was looking more toward the lesser expensive options. And yes for the LS1 is a completely different ball game for manifolds in comparison to SBC's. I don't think having 4 of these are going to cheap:

 

IDACAST3.jpg

 

Thanks,

 

Tyson

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Yeah, I've been looking at the Fuel injection throttle bodies, but of course there is no cost listed. Depending on cost they might work out, but I was looking more toward the lesser expensive options. And yes for the LS1 is a completely different ball game for manifolds in comparison to SBC's. I don't think having 4 of these are going to cheap:

 

IDACAST3.jpg

 

Thanks,

 

Tyson

 

Figure 300ea maybe more.

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I cannot verify the numbers, but it was "stated' in some string I found on the Megasquirt forum here at HybridZ that the 42mm ITB should be able to support just near 400hp. Just as a matter of note, this diameter is a minimal size, and sets velocity through the ITB at the upper end of "acceptable" (according to what I've read about ITBs and manifold fabrication for EFI applications).

 

The Weber products are pretty expensive, and there are cheaper ways to fabricate a rudimentary EFI set-up that should run well using only timing and TPS inputs.

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The Harrop TBS setup is currently about AU$5800 with the install kit another AU$1500. http://www.harrop.com.au/root_folder/harrop_manifolds/amfd7022-00.html

 

Hocking also has a LS1 setup.. http://www.hockingracingshop.net/

 

Aussie $ is about 1.285 to the US$.

 

 

Stack has a LS1 crossram for about US$3500. http://www.verycoolparts.com/Stack.htm

Power Trip Performance vertical Stack system... http://www.ptperf.com/files/ls-pics.htm

 

Kinsler LS1 setup is in the $5-6000 range, I believe. http://www.kinsler.com/NewProducts/PDF/GM_LS1_ManifoldLR.pdf

 

Also appears Barry Grant will have a setup also.. http://www.barrygrant.com/pages/sema06.aspx

 

A new one in the UK... http://www.jenvey.co.uk/~Newprod.htm

 

Also, a good ITB discussion at: http://www.ls1tech.com/forums/showthread.php?t=568773

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  • 7 years later...

It's been years since I've posted here, but for the sake of someone else looking for a DIY project for a cheap V8 ITB set-up, check out the LS1 Tech page in which I fabricated a set-up using a highly modified aftermarket intake, some Chrysler LHS throttle bodies (Holley 48MM), and some home fabrication and welding. Using the Holly HP EFI system, the total cost of getting it up and running (mechanical and electronic) was about $2400 for everything. Again, a lot of home-made stuff, but nothing that a drill press, and common sense couldn't handle. The photos are a bit dated, but nothing has changed other than the system runs very well (took awhile for this old-school carb man to tune with a computer).

 

http://ls1tech.com/forums/fueling-injection/1269857-poor-mans-ls1-itb-fab-up.html

 

 

standard.jpg

 

  

Also, my signature still works, so anybody interested in viewing the ITB set-up for a DIY'er, you can view the documentation photos (lower link), but look under the album called Manta ITBs instead of the Z-car albums

 

Terry

Edited by blueovalz
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