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slrvette 06-29-2009, 11:55 AM I picked up a used LT-1 TB for my HSR project. Now I don't know where the vac lines hook up to. Is there a diagram anywheres? Also I was told that I would need to bypass the coolant connections? I'm assuming that all I need to do is cap the coolant connections on the tb? Thanks guys slrvette 06-29-2009, 06:19 PM Maybe what I should be asking for is a vac diagram for the LT-1? SportsCarsUnlimited 06-30-2009, 02:55 AM I picked up a used LT-1 TB for my HSR project. Now I don't know where the vac lines hook up to. Is there a diagram anywheres? Also I was told that I would need to bypass the coolant connections? I'm assuming that all I need to do is cap the coolant connections on the tb? Thanks guys For a Custom install there are very few vacuum lines needed,Fuel pressure regulator,PCV valve,brake booster (if used),Distributor vent,EGR. Will it have to pass an emissions test? We have all the GM service manuals, just let me know what you need and i will send them to you. The coolant going to the throttle body needs to be capped off. David Steele slrvette 06-30-2009, 07:02 AM For a Custom install there are very few vacuum lines needed,Fuel pressure regulator,PCV valve,brake booster (if used),Distributor vent,EGR. Will it have to pass an emissions test? We have all the GM service manuals, just let me know what you need and i will send them to you. The coolant going to the throttle body needs to be capped off. David Steele Just to bring you up to speed if you don't already know this is a CFI to HSR conversion. My ecm will already handle to multiport injection and the HSR was won from Holly. So I might just well go for it since not much more money will get me there. I don't have to pass emissions. My EGR is already disconnected. I found a TB diagram that shows exactly my coolant lines. Then I have 4 more points on the TB for vac. I think its 4. So I would like to know where i connect those to as well as where I need to connect the FPR. I did find a vac diagram for an 86 but not sure if thats close or not. thanks vetteoz 07-01-2009, 12:56 AM . Then I have 4 more points on the TB for vac. So I would like to know where i connect those to as well as where I need to connect the FPR. HSR has threaded ports on the rear. Use large one for brake booster and one of the smaller ones for the FPR . Can use the 2nd small one for HVAC and cruise vac through the one way valve as per stock setup. I found it tight under the plenum so I relocated the IAT sensor to one of the large rear holes and I ran the PCV vac from under the plenum. The only vac you should need off the TB is the line to the purge canister under LHS headlight. slrvette 07-02-2009, 07:42 PM The IAT sensor I don't have but am going to add one. Found a holley air filter that has a spot for it. So it looks like most of the TB vac ports are pretty much just gonna get plugged up. | |