LS1 Built for boost
Thread Starter
Teching In
Joined: Aug 2007
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LS1 Built for boost Hi Guys,
I have been doing a lot of research and need some advice to make a final decision. Based on what I have read I think everyone will be in favor of set up 1 below but since I am going to have the engine out I keep thinking I need to go bigger cubes but maintain the stock bore of the LS1 which is what leads me to set up 2 . The driveline is built to handle 1,000 rwhp which I don't ever anticipate going that high with a stockish bore LS1.
Car currently is stock shortblock, stock heads, stock cam, TVS1900 14psi and e85 and I am right at 600rwhp. Car is driven on the street 99,9% of the time and is not used to race unless it is a high way pull or back road fun. Heads are AFR 1660 small bore heads that flow 230cc and I will match the cam to whichever set up I land on. Heads are not negotiable. My question is would the 383 net that much more power given the displacment or would set up 1 work best with just more boost?
Set Up 1: Reuse stock crank and go with a forged H beam rod and forged piston for boost. Would match up H beam rod, wiseco piston and tool steel wrist pins and ARP2000 rod bolts for compression between 10:1 and 10:5:1.
Set Up 2: Go with a full 383 forged rotating assembly to increase cubes and take advantage of having the motor out. Would match up H beam rod, wiseco piston and tool steel wrist pins and ARP2000 rod bolts for compression between 10:1 and 10:5:1.
I have been doing a lot of research and need some advice to make a final decision. Based on what I have read I think everyone will be in favor of set up 1 below but since I am going to have the engine out I keep thinking I need to go bigger cubes but maintain the stock bore of the LS1 which is what leads me to set up 2 . The driveline is built to handle 1,000 rwhp which I don't ever anticipate going that high with a stockish bore LS1.
Car currently is stock shortblock, stock heads, stock cam, TVS1900 14psi and e85 and I am right at 600rwhp. Car is driven on the street 99,9% of the time and is not used to race unless it is a high way pull or back road fun. Heads are AFR 1660 small bore heads that flow 230cc and I will match the cam to whichever set up I land on. Heads are not negotiable. My question is would the 383 net that much more power given the displacment or would set up 1 work best with just more boost?
Set Up 1: Reuse stock crank and go with a forged H beam rod and forged piston for boost. Would match up H beam rod, wiseco piston and tool steel wrist pins and ARP2000 rod bolts for compression between 10:1 and 10:5:1.
Set Up 2: Go with a full 383 forged rotating assembly to increase cubes and take advantage of having the motor out. Would match up H beam rod, wiseco piston and tool steel wrist pins and ARP2000 rod bolts for compression between 10:1 and 10:5:1.
I have a forged 347 in my C5, wiseco pistons, compstar rods, stock crank. It is holding up to a YSi at 20 psi. Primarily street driven and ran in half mile events. Compression is 10.0:1, 93 octane, and meth injection, ported 243s. Car runs great, and is a lot of fun, but i wish it had more down low to it.
My SS has a 383 in it, which i just swapped over to 317 heads, and will be running a billet S480 on E85, 10.2:1 compression.
With a centri blower on the C5, I kick myself in the *** for not going with more cubes. With a TVS, your low end power will probably be better. From a strength and cost standpoint, the 347 stock crank would probably work just fine. But if you have the motor out, and are willing to dish out the extra cash, more cubes is the way to go.
My SS has a 383 in it, which i just swapped over to 317 heads, and will be running a billet S480 on E85, 10.2:1 compression.
With a centri blower on the C5, I kick myself in the *** for not going with more cubes. With a TVS, your low end power will probably be better. From a strength and cost standpoint, the 347 stock crank would probably work just fine. But if you have the motor out, and are willing to dish out the extra cash, more cubes is the way to go.
Thread Starter
Teching In
Joined: Aug 2007
Posts: 36
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Yeah, right now with my set up I am at full power at 2300 rpm so I don't need more down low grunt. I currently have 3.07 gears and still fry the tires at will.
My thought with the 383 is go bigger cam and trade some down low power for a higher powerband and allow the increase displacement to make use of the boost up top. This obviously will create more heat and not sure I would really see that much more gain for a set up that is twice the cost.
Thanks for your input. Even though you have a centrifugal it gave me some food thought
My thought with the 383 is go bigger cam and trade some down low power for a higher powerband and allow the increase displacement to make use of the boost up top. This obviously will create more heat and not sure I would really see that much more gain for a set up that is twice the cost.
Thanks for your input. Even though you have a centrifugal it gave me some food thought
This may not be a popular idea, but I would let it ride as is. Unless you have plans to upgrade the blower, why bother with more engine mods? At some point in the very near future, that 1900 is just going to be pumping ever hotter air.
