L83 L93 Gen V How to Kill a Vacuum Pump
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On The Tree
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L83 Vacuum Pump location. This photo of the Corvette LT1 engine shows the same aluminum block structure without the trucks vacuum pump. Corvettes come with an electronic vacuum pump. In the corvette the supply and return oil holes that lubricate the mechanical truck pump are plugged from the factory.
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On The Tree
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L83 LT1 vacuum pump delete. This photo of my own engine and GM part and part number shows the location of the two plugs. The big difference in looks from truck to corvette engine is from the water pumps (truck pulley is to the driver side and corvette pulley is to the passenger side). Also the intakes are very different. But the new truck intakes look more like a LS6 or LS3 intake. It is also significantly lowered profile which helps package the engine in multiple cars or trucks.
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On The Tree
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L83 intake source for power brake vacuum. My first choice for Power Brake Vacuum will be the EVAPORATOR/PURGE CONTROL VALVE (Number 36 on the diagram). This is an electronic controlled valve used to allow fuel tank fumes to enter the intake. It is part of the emissions system. Since I am not using this valve I hope to get sufficient vacuum for the brake booster from its port. I won't have my wire harness for 6 weeks, so a test will have to wait. I spoke with Jared at ICT billet and I ordered part number 551359 (LT L83 L86 LT1 Billet Purge Solenoid Delete Plug Evap Block Off Gen V Intake Manifold). My plan is to drill and tap ICTs billet aluminum plug for a 3/8 fitting to run a vacuum line to the booster. As soon as I get it install I will post photos.
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On The Tree
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L83 Harness Hello. I sent my harness to Current Performance Wiring in Florida. They reworked it to run as a stand alone system. I am working on it this week to see if I can fire up my engine.
I'll post my results soon.
I'll post my results soon.
Last edited by mzrico; Jun 29, 2016 at 10:25 AM.
Teching In
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I saw they reworked for a pretty reasonable price. I just didn't know how the length would work out as it seems id have to mount computer in engine bay instead of cab. where are you mounting yours? what are you putting your setup in? thanks for advice.
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On The Tree
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L83 factory Harness If I use my harness as it is, I can mount the ECM and Fuse/Relay box on the driver side inner fender. But the look and final result would be a practical one.
Teching In
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I've been checking back on this thread for a while. I have a GenV engine that I'm getting ready to use and hope to do something similar.
I'm curious to see how the wiring harness works out and the results of your vacuum test.
I'm curious to see how the wiring harness works out and the results of your vacuum test.
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On The Tree
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L83 power brake vacuum source. I am getting very close to firing my engine and measuring the vacuum pressure. I will post my results by next week if all goes well.
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On The Tree
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Unable to test the engine just yet. The harness from Current Performance Wiring is not working. I got to talk to Jared (owner ) and still no answer yet. I will post information about the harness and what solution I get from Current Performance Wiring. If I don't get a solution I'll be sure to let everyone know ASAP.
In a more positive note I go
In a more positive note I go