Engine build suggestions - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Omega · 12-27-2018, 05:22 PM

I've got an AGP G8 pushing some good power, but I know it won't last for ever. It's got baby 50ish mm turbos and a cam'd LS3 and an M6

My plan is to go ~10.5:1 427LSX with Brodix BR7 heads (Ti and Inconell) and Gen2 Precision 6466 .82 turbos. Pump gas and race for the high boost situations.

I'm looking for solid a 1-1.2KHP with the ability to take the car on a long trip. To me, I think this is where cam and valve train are key and where I'm a little stuck. I've received the following cam specs from two different suppliers given the same criteria:
A: 232/240 .646/.630 117 +4LSA
B: 235/242 .666/.651 115 +2LSA

They are fairly close, except for the LSA. Cam A seems like it will be very mid range, easy on the valve train and idle smooth. B will have a tad more power up top and idle nicely. Going by the LME Brodix head build options, I can go with the LME Platinum springs (good for .660 lift) then buy run of the mill LS7 lifters and rockers? I don't necessarily want to cheap out, but do I need to go with bar lifters and an exotic rocker with the higher lift cam?

I'd like it to have a bit of a rump like cam B might have. My current cam is 222/226 .598/.598 116 +1LSA and its very tame.

dreksnot · 12-27-2018, 06:51 PM

My motor is assembled and awaiting the intake, and time to install. This is the cam they spec'd for nice daily driving (on 91 octane) but plenty of power on those wanna-be-nasty race days (E66), and my target RWHP. It's always interesting to see how each "vendor" spec's out a cam. Both of your cam specs look close, doubt you'd be able to tell the difference driving. Then again, spec'ing a cam is voodoo magic to me.

LSX427 11:1CR 1300rwhp target
TrickFlow 245cc cathedral
237/247 .610"/.601" 116+5 (10* overlap)
Twin AGP 65mm 0.82ar journal bearings
Johnson lifters 0.680" lift
GM LS1/2/6 ROCKER ARMS

stevieturbo · 12-28-2018, 03:00 PM

Not a chance you'd even be able to tell the difference between those two cams.

There will be no difficulty making the power goals with almost any camshaft and that engine/turbo combo.

fif_gen_powa · 12-28-2018, 05:46 PM

Quote:

Originally Posted by stevieturbo

Not a chance you'd even be able to tell the difference between those two cams.

There will be no difficulty making the power goals with almost any camshaft and that engine/turbo combo.

Yup that thing is gonna make a ton of power no matter what. I'd be looking at reliability and longevity standpoint of the less aggressive camshaft

Batmanntexas · 12-28-2018, 07:08 PM

For peace of mind, I'd probably ditch the stock LS7 lifter and rockers. I'd look at the Johnson line of lifters and Texas Speed's roller rocker for the LS engines. Just my $.02 though.

Unavowed · 12-28-2018, 08:51 PM

As a G8 owner who has had many conversations with the guys at AGP, I'm not sure those turbos are going to fit. Granted I have an A6 so perhaps there is more room on a manual car, but I was told the turbos that I have, BW 57/61's, are the largest that would fit without notching frame rails, etc.
I also agree with the Johnson lifter recommendation.

stevieturbo · 12-29-2018, 05:35 AM

Quote:

Originally Posted by Batmanntexas

For peace of mind, I'd probably ditch the stock LS7 lifter and rockers. I'd look at the Johnson line of lifters and Texas Speed's roller rocker for the LS engines. Just my $.02 though.

He wont be using LS7 rockers with an LSX block. Do they not require link bars ?

Omega · 12-29-2018, 08:00 AM

Quote:

Originally Posted by Unavowed

As a G8 owner who has had many conversations with the guys at AGP, I'm not sure those turbos are going to fit. Granted I have an A6 so perhaps there is more room on a manual car, but I was told the turbos that I have, BW 57/61's, are the largest that would fit without notching frame rails, etc.
I also agree with the Johnson lifter recommendation.

I have to Kevin a bit also. He only mentioned ditching the normal plenum (Im using the AGP plenum and piping also). I'll have to double-check with him about fitment

Sent from my Pixel XL using Tapatalk

RealQuick · 01-06-2019, 12:56 PM

Quote:

Originally Posted by Batmanntexas

For peace of mind, I'd probably ditch the stock LS7 lifter and rockers. I'd look at the Johnson line of lifters and Texas Speed's roller rocker for the LS engines. Just my $.02 though.

Good advice on the lifters

Unavowed · 01-09-2019, 04:22 PM

Quote:

Originally Posted by Omega

I have to Kevin a bit also. He only mentioned ditching the normal plenum (Im using the AGP plenum and piping also). I'll have to double-check with him about fitment

Sent from my Pixel XL using Tapatalk

Any.news from AGP on turbo fitment?

Omega · 01-09-2019, 04:48 PM

Quote:

Originally Posted by Unavowed

Any.news from AGP on turbo fitment?

No, I've been wrapped up in lifter options and research. Will email him now

Sent from my Pixel XL using Tapatalk

12-27-2018, 05:22 PM	#1
Omega Drives: G8 Join Date: Mar 2012 Location: NJ Posts: 251	Engine build suggestions I've got an AGP G8 pushing some good power, but I know it won't last for ever. It's got baby 50ish mm turbos and a cam'd LS3 and an M6 My plan is to go ~10.5:1 427LSX with Brodix BR7 heads (Ti and Inconell) and Gen2 Precision 6466 .82 turbos. Pump gas and race for the high boost situations. I'm looking for solid a 1-1.2KHP with the ability to take the car on a long trip. To me, I think this is where cam and valve train are key and where I'm a little stuck. I've received the following cam specs from two different suppliers given the same criteria: A: 232/240 .646/.630 117 +4LSA B: 235/242 .666/.651 115 +2LSA They are fairly close, except for the LSA. Cam A seems like it will be very mid range, easy on the valve train and idle smooth. B will have a tad more power up top and idle nicely. Going by the LME Brodix head build options, I can go with the LME Platinum springs (good for .660 lift) then buy run of the mill LS7 lifters and rockers? I don't necessarily want to cheap out, but do I need to go with bar lifters and an exotic rocker with the higher lift cam? I'd like it to have a bit of a rump like cam B might have. My current cam is 222/226 .598/.598 116 +1LSA and its very tame.

12-27-2018, 06:51 PM	#2
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,608 View My Garage	My motor is assembled and awaiting the intake, and time to install. This is the cam they spec'd for nice daily driving (on 91 octane) but plenty of power on those wanna-be-nasty race days (E66), and my target RWHP. It's always interesting to see how each "vendor" spec's out a cam. Both of your cam specs look close, doubt you'd be able to tell the difference driving. Then again, spec'ing a cam is voodoo magic to me. LSX427 11:1CR 1300rwhp target TrickFlow 245cc cathedral *237/247 .610"/.601" 116+5 (10 overlap) Twin AGP 65mm 0.82ar journal bearings Johnson lifters 0.680" lift GM LS1/2/6 ROCKER ARMS __________________ In excess of 1,000WHP** LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

12-28-2018, 07:08 PM	#5
Batmanntexas Drives: 2012 Camaro SS (2SS) Join Date: Aug 2012 Location: Stafford, VA Posts: 1,374 View My Garage	For peace of mind, I'd probably ditch the stock LS7 lifter and rockers. I'd look at the Johnson line of lifters and Texas Speed's roller rocker for the LS engines. Just my $.02 though. __________________ 745RWHP/634RWTQ on 93 @ 10psi 806/676 on E85 @ 10psi COTW 9/8/14

12-28-2018, 08:51 PM	#6
Unavowed Drives: Twin turbo G8 GXP Join Date: Dec 2012 Location: MD Posts: 454	As a G8 owner who has had many conversations with the guys at AGP, I'm not sure those turbos are going to fit. Granted I have an A6 so perhaps there is more room on a manual car, but I was told the turbos that I have, BW 57/61's, are the largest that would fit without notching frame rails, etc. I also agree with the Johnson lifter recommendation. __________________ 9.88 @ 144 https://youtu.be/nN0rz1RAcJw

12-28-2018, 03:00 PM	#3
stevieturbo Drives: it changes Join Date: Nov 2010 Location: Norn Iron Posts: 1,126	Not a chance you'd even be able to tell the difference between those two cams. There will be no difficulty making the power goals with almost any camshaft and that engine/turbo combo.