telly444

trying to decided which route to take. I have a 07 Z with a E force SC , H/C/E all bolt ons with with meth. I would like to max out my blower, which I think is around 12 lbs boost with the smallest pulley and a different dampener. my question is should I get a whole new short block ( ERL or RHS) or can my stock block with forged internals and the proper pistons hold up to this amount of boost and still be reliable?

MyLS1Hauls

If your tuner is good, and the motor doesn't detonate, the stock sleeves will probably be ok for your blower. I know people who are getting away with it with centri/turbo setups (up to 800rwhp), but everything has been optimized and the tune is conservative, and the cars aren't driven like they are stolen. Get greedy with timing (keep it soft around peak torque), and run the car hard on real long pulls, and you could have a problem.

If it were me, I'd drop the compression at least half a point with different pistons, get the quench distance tight with proper piston design, run a big meth nozzle, and get someone good to tune it. I'd also keep the overlap low with the cam. That blower will have a hard enough time filling the cylinders, without blowing boost out the exhaust port.

Also keep in mind, the TVS blowers get HOT when you over spin them. A 427 is a big motor to fill with a 2.3L supercharger. I'd keep the pulley ratio conservative. 12psi is a tall order. You will stop gaining power if the blower is too far past its efficiency range, and the discharge air is too hot, even if the boost is going up.

telly444

thank you for the educated answer. My cam is pretty big that I run at the moment. It kills my power but saves my motor a bit by blowing boost out the exhaust, lol for now with a stock bottom I'm all about safety. I run the vengeance racing Kaotik cam

C6 Curtis

what he said, but as far as cam goes you will be fine. I have an N/A cam 112LSA 40* of overlap and I still made 840@ 6 psi on my turbo set up. So as far as big cams don't make power on a boosted set up goes I think its a myth.

-Curtis

MyLS1Hauls

40* overlap at .006 is awfully low, and awfully high at .050. What are your actual cam specs?

Also, you have a turbo setup. There is a big difference between a properly sized turbo, and a smallish blower. You don't want, nor need huge overlap with a TVS2300 on a 427. It isn't a myth. The idea is to trap as much air in the cylinders as possible...If you're blowing it right out the open exhaust valve, how does that make power?

C6 Curtis

I have the LG G7XX biggest cam they make but they don't release the specs. May not match good with the 2300 but with a bigger blower or turbo it will still make more power then a stock cam. To give you an idea I made 623/545 N/A, removed the long tubes added stock LS7 manifolds Billet S480 and pulled 837/741 @5.8psi


-Curtis

MyLS1Hauls

Huge cam for sure and impressive numbers, no doubt. I wouldn't mess with it if you're happy with how it runs.

WhiteDiamond

Just to repeat what was mentioned, make sure your tune is ON THE MONEY. The stock sleeve is cast iron and brittle. Very thin, as well. I am looking at my cylinder #7 cracked sleeve and that was only heads/cam mods. Tune was off........

GeneSch

Is this with the stock short block?

C6 Curtis

Yes 840/741 Turbo

https://www.corvetteforum.com/forums...d-800-whp.html

623/545 N/A

https://www.corvetteforum.com/forums...-wcch-etc.html

Lsx Revival

or have steve at red put darton sleeves in your block