MY FSP Built AGP TT Camaro [COTW 4/20/15]

[1KillerSS]

All the engine builders I consulted before doing my build, recommended that compression. Livernois, ERL and a few others to include FSP. So I listened to the people that know more than me. Doesn't the zl1 with turbos bolted onto it do ok?


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[Unreal]

Sure, it does fine, but would do better with 10:1.
I'm really surprised those places recommended that low. Livernois specifically makes 9.7:1 pistons along with most other places, so I don't know why they would go lower.

Caddy racing lifters are just LS7 lifters with ceramic balls. The Johnson SLR lifters and Morels are far superior.

[Unreal]

Originally Posted by hammdo

That is interesting. LSX B15 is 9.0 to 1. Would you elaborate? I'm interested in knowing why...

Thanks!

-Don

Less efficient, less power, less MPG, slower spooling, runs hotter. This isn't the 60s with no control over timing. There is really no advantage except it makes it harder to screw up tuning, but any decent tuner can deal with higher compression and boost.

AGP just finished a 1300+rwhp built, and did 10.8:1. A lot of places are doing 11-12:1 on boost if it is an e85 build.

[1KillerSS]

Thanks for your input Nick, as always I value your opinion, and expertise. What's done is done. I did my homework when I started this project, apparently I've fallen short in this area. I guess this is another learning experience for me.Hopefully the car will be able to get out of its own way, when I press the gas.

[Unreal]

Don't get me wrong, it isn't bad, it isn't going to mess stuff up. The car will run great. It is just basically free power/spool/mpg you gave up.

I'm surprised it is that low. What size chamber heads/etc as that has a big effect too. Pistons are only one part of the equation. They may have spec'd a "9.2" piston because your heads are going to bump that up.

Would be like running 62mm turbos to make 800rwhp, when a 57mm will do that just fine, with a broader power band. The bigger ones aren't "wrong" or bad, but different and have some downsides.

[1KillerSS]

Originally Posted by Unreal

Don't get me wrong, it isn't bad, it isn't going to mess stuff up. The car will run great. It is just basically free power/spool/mpg you gave up.

I'm surprised it is that low. What size chamber heads/etc as that has a big effect too. Pistons are only one part of the equation. They may have spec'd a "9.2" piston because your heads are going to bump that up.

Would be like running 62mm turbos to make 800rwhp, when a 57mm will do that just fine, with a broader power band. The bigger ones aren't "wrong" or bad, but different and have some downsides.

As a matter of fact, they were all planning on doing heads when I was speaking with them. What heads would you suggest I get? I had planned on doing heads later down the road.

[hammdo]

Thanks Nick. I'm at 10.5 with my boosted LSA setup and was curious.

Very interesting to see this discussed...

-Don

[Unreal]

LSA or LS9 heads are best bang for buck. All depends on budget. Anything past that and I would be doing all pro/mast/etc that all cost $3500+.

Some decent CNC'd LSA heads will make 1000rwhp all day long with decent gaskets/studs. Have them setup to bump the compression a little IMO.

[SSE 4 2SS]

Originally Posted by Unreal

LSA or LS9 heads are best bang for buck. All depends on budget. Anything past that and I would be doing all pro/mast/etc that all cost $3500+.

Some decent CNC'd LSA heads will make 1000rwhp all day long with decent gaskets/studs. Have them setup to bump the compression a little IMO.

^^^^^ This,

I ran LSA heads until we pushed past what a 4 bolt head could handle which was in the neighborhood of 24 lbs of boost and 1300 + RWHP... The heads held up fine but we couldn't put enough bolt/stud in there to keep them clamped... I went six bolt...

[SSE 4 2SS]

Originally Posted by hammdo

Thanks Nick. I'm at 10.5 with my boosted LSA setup and was curious.

Very interesting to see this discussed...

-Don

10.5 is pretty standard with boosted set-ups.... My new motor is running that compression.

The power gained from just upping the compression at a given boost level with all else the same is amazing...

[1KillerSS]

Originally Posted by Unreal

LSA or LS9 heads are best bang for buck. All depends on budget. Anything past that and I would be doing all pro/mast/etc that all cost $3500+.

Some decent CNC'd LSA heads will make 1000rwhp all day long with decent gaskets/studs. Have them setup to bump the compression a little IMO.

At the moment, how much fuel I have left, is still to be determined. Also, I only have a clutch that will support 1000wtq. For those two reasons, I decided to put the heads on hold, and wait till I upgraded my fuel and clutch. The chosen compression was based on the recommendations from the engine builders I talked to, and you are correct, Livernois recommended 9.7:1, I looked at the quote they gave me again, and its there in plain writing. I still overlooked that detail and am kinda bummed about it. But like you said, I can bump it up when I change the heads.

[Unreal]

Originally Posted by SSE 4 2SS

^^^^^ This,

I ran LSA heads until we pushed past what a 4 bolt head could handle which was in the neighborhood of 24 lbs of boost and 1300 + RWHP... The heads held up fine but we couldn't put enough bolt/stud in there to keep them clamped... I went six bolt...

Sadly local guy went 6 bolt heads, and blew a cylinder passage into a bolt hole 1st decent power pass. Would have been better off with LSA heads.

[SSE 4 2SS]

Originally Posted by Unreal

Sadly local guy went 6 bolt heads, and blew a cylinder passage into a bolt hole 1st decent power pass. Would have been better off with LSA heads.

Was this a six bolt head on a 4 bolt block?

[1KillerSS]

Originally Posted by SSE 4 2SS

Was this a six bolt head on a 4 bolt block?

+1
I was wondering the same thing.