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LS3 swap problems

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Old 07-14-2014, 02:02 PM
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Default LS3 swap problems

Ive almost got my new 650hp LS3 ready to go in the car. I do not understand the fuel adapters for the FAST 102 intake. Has any one who has done this help me out? I know I need some adaptors But not sure what.
Old 07-14-2014, 04:26 PM
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Are you using LS3 style fuel injectors with LS3 style fuel rails?
Old 07-15-2014, 09:35 AM
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ID850 Injector dynamics for ls3. FAST fuel rail. Injectors fit perfect no spacers or anything. But the adaptors seem to be all wrong. I cant seem to find another set-up on a CTS-v to copy.
Old 07-15-2014, 03:18 PM
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Oh, I thought you were talking about the spacer setup!

Huh.... if you are using the LS6 wiring harness, I believe you need a USCAR to EV1 PnP adapter ... but you've probably got the LS3 harness... so I would have thought it was plug and play. What car did you pull the harness from? It has LS3 style injector connections?

I don't have this setup, just trying to help out.

Last edited by 1BADCTS; 07-15-2014 at 03:29 PM.
Old 07-15-2014, 04:48 PM
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Post pics of what you have. I didn't need any electrical adapters when I installed my ID1000's on an LS3 fuel rail, LS3 fast102 and stock LS2 wiring harness. I did have to use the injector spacers and spacers under the fuel rail bolts. The injectors looked like they fit fine but blew fuel all over so I had to take up the extra slack between the rail-injector-intake.
Old 07-17-2014, 09:20 AM
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I was talking about the fuel line. from car to the Fast intake rails. But found the info on the other forum. Thanx for the info. guys. Sorry my post was fuzzy at best.
Old 07-17-2014, 09:52 AM
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Can you share a link to your find, so that others know the answer without having to ask again?



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