Optimized reliability and power?

[dbramaged]

I've decided to go with the LS Turbo set up running a stock DSM 20G turbo. I've been looking at internals for the 2000 LS engine and was wondering the optimal compression to run the turboed engine?

I found that I will have "Stage 2 Turbo Camshafts" from Crower, Titanium retainers, Crower Valves and Valve Springs, I-Beam Rods, Eagle Crankshaft and CP Pistions... But what would be a reliable compression on the B18B running a good 10-14lbs with this setup? I'm thinking 8.5:1 should be good, right?

 

[TiiM iiS l3eAsT]

9:1 is the best compression for boost

 

[Gonzo]

the lower the compression the easier to tune and more reliable it would be theoretically...so a good 8.5:1 or 9:1 is a good range

 

[somejaykid]

the lower the compression the easier to tune and more reliable it would be theoretically...so a good 8.5:1 or 9:1 is a good range

 

[s_crowley 17]

the lower the compression the easier to tune and more reliable it would be theoretically...so a good 8.5:1 or 9:1 is a good range

8:5:1 - 9:0:1 is a very good low compression ratio.. 9:1 being the most 'popular'

remember that an advantage to a slightly higher compression ratio is better off boost, low end, power and response.

 

[dbramaged]

Thanks for the info! I will be ordering either 8.5:1 or 9:1 pistons then. As I'm going to be boosting the LS, who makes the most reliable block guard? I think that would be easier than taking it to a machine shop and fillin' 'er up! lol

 

[got traction]

dont forget that the lower the compression the more boost your going to throw at it to make power. building a bottem end for boost dosent give you power. it allows you to throw more boost at it to make the powre. and for the crower cams and s**t. i personally have a crower stg 2 cam and the springs and retainers. talk to bisimoto about his cams. you wont be dissapointed

 

[dbramaged]

dont forget that the lower the compression the more boost your going to throw at it to make power. building a bottem end for boost dosent give you power. it allows you to throw more boost at it to make the powre. and for the crower cams and s**t. i personally have a crower stg 2 cam and the springs and retainers. talk to bisimoto about his cams. you wont be dissapointed

Well, I understand that building the block isn't going to give me more power itself, but allow more boost. I just want it to be reliable without causing issues if I decide to run up to 14-16lbs off the 20G turbo every now and again. Most days, I want to be sitting around 10-12lbs though.
Again, the whole reason I'm building the block is to maintain reliability, not crazy HP.

 

[got traction]

Well, I understand that building the block isn't going to give me more power itself, but allow more boost. I just want it to be reliable without causing issues if I decide to run up to 14-16lbs off the 20G turbo every now and again. Most days, I want to be sitting around 10-12lbs though.
Again, the whole reason I'm building the block is to maintain reliability, not crazy HP.

dont cheap out and make sure you spec it out and s**t and you should be good

 

[dbramaged]

I figure I'm going to have about $2300 invested in internals, so I have a legitimate idea to build it decent. I don't want to be driving around and go, "Was that my rod that just flew out from under the hood?" I will invest the time and money over the winter to make sure it's done right. That way, next spring when I get my motorcycle, I can put the car up on blocks and do all the work within 2-3 weeks. I want all the parts waiting to be put in rather than doing a little here and a little there.

 

[s_crowley 17]

Exactly, take time and buy all the right parts for your needs.

 

[got traction]

Engine Management Engine Management Engine Managment

 

[dbramaged]

Engine Management Engine Management Engine Managment

Yeah, I'm still trying to figure out which system to use...