OlderThanMe Posted August 28, 2006 Share Posted August 28, 2006 so since I am going to be going with megasquirt and doing everything custom I was thinking... Take my current SU intake manifolds and put TBI on both of them. This would be combined with a turbo... I did a quick search but nothing came up. It would be different and get the "what the heck is that" look. Just something that came from sitting around too much. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 28, 2006 Share Posted August 28, 2006 www.twminduction.com makes su replacement throttle bodies. Pretty cool, but expensive too. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 28, 2006 Share Posted August 28, 2006 You could maybe use two Starion throttle bodies, they were TBI with one primary injector, and a secondary for boost if you can find them. I know the junkyard operators around there are smoking the rocks, but they turn up every so often for cheap. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 28, 2006 Author Share Posted August 28, 2006 yeah... just a little expensive...that is like 3/4 of what I bought my car for...and they are only good to 190hp. Maybe a pair of 50mm throttle bodies... Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 28, 2006 Share Posted August 28, 2006 That's really not too bad, $282.79 per throttle body...I see they sell su air horns for $13 too...that's the cheapest I've ever seen those. These probably don't include the injectors though. I only paid $200 for my z (the guy I got it from got it for free), so I have a hard time spending a lot on any single part. "That cost more than my whole car!" is a favorite of mine when people are trying to sell me stuff. Works great. I think Starion/Conquest throttle bodies might be the way to go, since they are out there, and they are already 1-barrell tbi throttles with 2 injectors per unit. Plus those engines were 2.6L, so even 1 draw through would be enough to feed your whole engine requirements. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 28, 2006 Author Share Posted August 28, 2006 well the TWM SU replacement was like $1500. That is what I was talking about...the starion units look like a good idea. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 28, 2006 Share Posted August 28, 2006 I pulled up the price list from twm and it said they were 280 or whatever, maybe I had the jobber price list. $1500 was what I was expecting it to cost, but I'm sure that came with fuel rails and injectors and linkages and whatnot. They also make weber replacements for doing the tripple double throttle bodies. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 28, 2006 Author Share Posted August 28, 2006 yes that was the bolt on SU replacement kit. I'm going to look on Evilbay for some of those starion TBI's I wonder if you can put a standard chevy TBI like this one sideways so that it will mount easily. Then run a Y-pipe and runners to each intake manifold http://cgi.ebay.com/ebaymotors/SBC-46mm-TBI-bored-throttle-body-590cfm-340hp-350-383_W0QQitemZ260024011718QQihZ016QQcategoryZ38634QQrdZ1QQcmdZViewItem Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 28, 2006 Share Posted August 28, 2006 I was thinking about doing something similar, but instead of having TBI, I was going to use the SU manifold and port the end of the runners so I could still have direct port injection. Then I was thinking I would use two stock EFI 50m TBs to replace where the carbs were. that might be a cheaper way to go assuming you can find some stock TBs easily. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 28, 2006 Share Posted August 28, 2006 As far as that goes, MSD makes a drill bit for drilling injector mounting bosses, but I'm pretty sure it's for o-ring style injectors. I know OTM can weld, so you could always splice the two manifolds together (fuel injection ends with su tubes). Quote Link to comment Share on other sites More sharing options...
mobythevan Posted August 28, 2006 Share Posted August 28, 2006 Tony D. was doing some kind of ultra stealth setup that had injectors in the carbs. Not sure what he was up to, but he didn't want anyone to think it was anything but an ole carb'd engine. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 28, 2006 Author Share Posted August 28, 2006 moby...that is VEWY VEWY intewesting.. so some basics here... TBI has injectors at the throttle body but then there is a throttle body with direct port injection. How is TBI so different than a carb? just sinced I am EFI dumb...I have my roundtops sitting on a table in my garage doing nothing...and an old busted mechanical fuel pump I could gut out to complete the look. just if I had some flat tops... Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 28, 2006 Author Share Posted August 28, 2006 so where is that thread about the sneaky SUs? I am searching... Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 28, 2006 Share Posted August 28, 2006 It's different from carbs because it has a fuel injector in it, so it's like an electronic carb. All the metering happens like with fuel injection, it just doesn't have one injector per cylinder. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 28, 2006 Author Share Posted August 28, 2006 I see... Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 29, 2006 Share Posted August 29, 2006 has any body looked at the carb manifold from a performance stand point? I know everyone says that the stock efin mani is a pretty poor design, but is that true of the carb mani as well? it looks a bit better than the efi one, but i was wondering other peoples opinions on it.. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 29, 2006 Author Share Posted August 29, 2006 wel for an EFI turbo standpoint I think it would be as good or better to have the SU intake. Shorter runners and can probably be ported larger than EFI runners. I'll go measure them. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 29, 2006 Share Posted August 29, 2006 as i recall i think the runners go down to about 45mm ID and the TB opening is close to 47.5mm ID, with pleanty of porting room. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 29, 2006 Share Posted August 29, 2006 The tubes on the su manifold are visibly larger than the efi runners. I think the ultimate way to do it is like the Wangan tripple carb turbo, but with the fuel injection throttle bodies on it; but we started this topic as a way to save a little money unless I missed the point somewhere. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted August 29, 2006 Share Posted August 29, 2006 Here is the thread where Tony mentions the project, now you can call him out and see what he has done with it. http://forums.hybridz.org/showthread.php?t=100651&highlight=stealth+conversion Quote Link to comment Share on other sites More sharing options...
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