Sierra RST Stock 4.8L Turbo: 617HP/623TQ
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Made a couple pulls tonight at 15psi and put down some good numbers. Was real happy with the lil 4.8L.
Like to thank kyle at KB-Racing for the awesome bolt on turbo setup.
![](http://i152.photobucket.com/albums/s192/blackhawkawd91/IMG_0563.jpg)
Little Video I put together....
http://www.youtube.com/watch?v=V9nRm6vZl_I
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Little Video I put together....
http://www.youtube.com/watch?v=V9nRm6vZl_I
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for a 4.8L w/ an LS6 cam/springs and a bolt on turbo kit....granted running E85 and 15lbs....thats pretty sick ![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
What fuel system you running to work w/ the E85?
edit - you also running the stock 4.8L intake? Keeping it for the TQ increase over an LS6 I take it?
Nice numbers btw!
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What fuel system you running to work w/ the E85?
edit - you also running the stock 4.8L intake? Keeping it for the TQ increase over an LS6 I take it?
Nice numbers btw!
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Thanks guys, she pulls pretty good turned up on the 15psi. I made a couple pulls at 10-11psi on the streets, prior to the 305 Nitto 555r's, but she's still tough on tires even with the DR's. It is a 5speed, but doesn't like fast shifts at all with this TQ.
http://www.youtube.com/watch?v=ukLjDCxuc9E
http://www.youtube.com/watch?v=DqLU5...eature=related
http://www.youtube.com/watch?v=ukLjDCxuc9E
http://www.youtube.com/watch?v=DqLU5...eature=related
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Hybrid86z, the fuel system is E85, Dual Walbro's, 8an return style, ls1 rails, 80lb injectors at 56psi base, so there rated at 92lb. On the dyno I was at 82% injector duty cycle.
I stuck with the truck manifold mainly because I was lazy and didn't want to swap. So far, only revving to 6300 it seems to hold HP/TQ pretty well. This 67mm turbo is tapped, but if I was to run a larger turbo and needed more RPMS, I'd consider a maniofold swap.
I stuck with the truck manifold mainly because I was lazy and didn't want to swap. So far, only revving to 6300 it seems to hold HP/TQ pretty well. This 67mm turbo is tapped, but if I was to run a larger turbo and needed more RPMS, I'd consider a maniofold swap.
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