tfreer85 Posted November 27, 2006 Share Posted November 27, 2006 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 Quote Link to comment Share on other sites More sharing options...
Dtsnlvrs Posted November 27, 2006 Share Posted November 27, 2006 Do a google on Redline Fuel Injection. I think they have a setup just for V-8's using 4 ITB's Quote Link to comment Share on other sites More sharing options...
tfreer85 Posted November 27, 2006 Author Share Posted November 27, 2006 Redline doesn't make a kit for the LS1, nor does TWM, Tweakit.com, the only place I've ever seen make a kit for the LS1 is in australia and it goes for 3.5k. Although a "kit" would be cool, like I said I've never seen one for the LS1 stateside. Tyson Quote Link to comment Share on other sites More sharing options...
Dtsnlvrs Posted November 27, 2006 Share Posted November 27, 2006 I must be a V-8 idiot, cause I did not know there was a difference in the manifold. However, take a look at www.redlineweber.com You could use a carb manifold, then get the right ITB's to go on it Quote Link to comment Share on other sites More sharing options...
tfreer85 Posted November 27, 2006 Author Share Posted November 27, 2006 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: Thanks, Tyson Quote Link to comment Share on other sites More sharing options...
Dtsnlvrs Posted November 27, 2006 Share Posted November 27, 2006 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: Thanks, Tyson Figure 300ea maybe more. Quote Link to comment Share on other sites More sharing options...
tfreer85 Posted November 27, 2006 Author Share Posted November 27, 2006 Anyone else have any comments or suggestions? Any book suggestions or reading on this? Thanks Tyson Quote Link to comment Share on other sites More sharing options...
blueovalz Posted November 27, 2006 Share Posted November 27, 2006 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. Quote Link to comment Share on other sites More sharing options...
LS1 240Z Posted November 27, 2006 Share Posted November 27, 2006 i was thinking about using 2 honda velocity stacks... i know they are readily availble and fairly cheap Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted November 27, 2006 Share Posted November 27, 2006 I think hayabusa throttle bodies are 46mm ITB. Two sets of thse spaced out properly may work well. Justin Quote Link to comment Share on other sites More sharing options...
tfreer85 Posted November 28, 2006 Author Share Posted November 28, 2006 Awesome thanks a lot guys for the ideas, I've got a lot of research to do. Thanks, Tyson Quote Link to comment Share on other sites More sharing options...
big B Posted November 28, 2006 Share Posted November 28, 2006 kinsler fuel injection has itb setups for ls-1's http://www.kinsler.com Quote Link to comment Share on other sites More sharing options...
Meghan Posted November 28, 2006 Share Posted November 28, 2006 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 Quote Link to comment Share on other sites More sharing options...
tfreer85 Posted November 28, 2006 Author Share Posted November 28, 2006 Cool thanks, I had actually just gotten done reading that ITB thread. All very nice products and all VERY expensive. Seems like a of money for one but I'll have to see what I can build first. Thanks, Tyson Quote Link to comment Share on other sites More sharing options...
blueovalz Posted August 24, 2014 Share Posted August 24, 2014 (edited) 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 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 August 24, 2014 by blueovalz Quote Link to comment Share on other sites More sharing options...
texis30O Posted August 24, 2014 Share Posted August 24, 2014 I know someone that has 2 Harrop ITB set ups on his 2 LS converted 280Zs....... One carbon fiber and one is the regular plastic center cover...... Quote Link to comment Share on other sites More sharing options...
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