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Fast lsxrt questions

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Old 09-25-2017, 01:10 PM   #1
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Default Fast lsxrt questions

I am planning on installing a fast lsxrt on my 08 silverado 6.0 cathedral port set up, after a lot of research I pretty much got it all down except for the fuel rails. I would like to run fast billet rails but not sure if I need to run a fuel pressure regulator, if so does someone have a pic of it or instructions on how to run one ?
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Old 09-25-2017, 11:20 PM   #2
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Your better off running a different manifold. Speaking from experience, I had nothing but issues with mine. Trying to get it idle correctly then it leaked. Just get a holley or edelbrock manifold
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Old 09-26-2017, 12:50 AM   #3
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Dang , well I got it for a decent deal , was yours warped ? What other issues did you have ?
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Old 10-04-2017, 11:04 AM   #4
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Your better off running a different manifold. Speaking from experience, I had nothing but issues with mine. Trying to get it idle correctly then it leaked. Just get a holley or edelbrock manifold
Never had an issue with mine - have the newer black version - install was done by my tuner and no idle or leak issues whatsoever.
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Old 10-04-2017, 06:27 PM   #5
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Never had an issue with mine - have the newer black version - install was done by my tuner and no idle or leak issues whatsoever.

Mine is a grey top but I put a straight edge across the intake ports and it seems pretty level
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Old 10-04-2017, 08:48 PM   #6
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Mine is a grey top but I put a straight edge across the intake ports and it seems pretty level
Just make sure you replace the valley cover bolts with the round top ones provides in the kit & torque everything down as instructed and it should be fine. A tweak to the tune is an absolute need as well or it will feel like garbage.
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Old 10-04-2017, 09:21 PM   #7
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Just make sure you replace the valley cover bolts with the round top ones provides in the kit & torque everything down as instructed and it should be fine. A tweak to the tune is an absolute need as well or it will feel like garbage.

how did your truck feel after the tune? Any noticeable difference up top and down low ? Also did you replace your coolant crossover ?
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Old 10-04-2017, 09:35 PM   #8
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I had to bend the hell out of my crossover to get it to fit but factory one works. Barely. Not much clearance at all.

You don't need a FPR. Just put an adapter from the FAST rails to your factory fuel line. Probably something like -6 AN port adapter that comes in the kit to a straight -6AN fitting. To short piece of line. To a 3/8 male quick disconnect. Something like that. Then run a cross over on the front. The first time around I ran a cross linked synthetic line but I heard stories about it can rot out and then I switched to a PTFE line.
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Old 10-05-2017, 09:39 AM   #9
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how did your truck feel after the tune? Any noticeable difference up top and down low ? Also did you replace your coolant crossover ?
Truck feels great after the tune - hard to really say if there was a difference between the TBSS I swapped out since the motor was fresh as well. PCM of NC sells a fuel rail cross-over for the LSXRT that works with the FAST rails if you're using them. I had them do the whole thing since they tune my ride as well. Happy with the whole set-up in the end.
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Old 10-06-2017, 06:39 PM   #10
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Truck feels great after the tune - hard to really say if there was a difference between the TBSS I swapped out since the motor was fresh as well. PCM of NC sells a fuel rail cross-over for the LSXRT that works with the FAST rails if you're using them. I had them do the whole thing since they tune my ride as well. Happy with the whole set-up in the end.

does it matter if the crossover is in the rear or the front ?
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