Turbo Cam vs Current Cam
Turbo Cam vs Current Cam I'm in the planning stages of a winter/spring Turbo build on my GTO.
Current Engine Specs:
ls2 Stock Bottom End
GMPP LS3 Heads
226/232 626/626 112+2 LSA
Turbo Specs:
Compressor Wheel 78mm
.80 a/r
4” Inlet and 2.5” Compressor Outlet
Inducer- 78mm
Exhaust Side:
Exhaust Housing T-4 Flange
.96 ar Exhaust Housing
3.0″ Vband outlet
Exducer- 76mm
Using truck manifolds and 2.25 piping for hot side
Probably going to stick around 8psi since I'm on a stock bottom end. I will be using a timing cover oil drain and plan on pulling the heads to change the gaskets(Cometic 0.040 thickness) to stock thickness to decrease compression a bit. Since I'll be in there, would it be worth it to swap cams. Was looking at the BTR Turbo cams and one was pretty close to my specs except for the LSA.
Any insight on how my current cam would perform with the turbo? I don't want to spend extra money if I don't have to since I'll probably end up buying a larger cube forged short block next year.
Current Engine Specs:
ls2 Stock Bottom End
GMPP LS3 Heads
226/232 626/626 112+2 LSA
Turbo Specs:
Compressor Wheel 78mm
.80 a/r
4” Inlet and 2.5” Compressor Outlet
Inducer- 78mm
Exhaust Side:
Exhaust Housing T-4 Flange
.96 ar Exhaust Housing
3.0″ Vband outlet
Exducer- 76mm
Using truck manifolds and 2.25 piping for hot side
Probably going to stick around 8psi since I'm on a stock bottom end. I will be using a timing cover oil drain and plan on pulling the heads to change the gaskets(Cometic 0.040 thickness) to stock thickness to decrease compression a bit. Since I'll be in there, would it be worth it to swap cams. Was looking at the BTR Turbo cams and one was pretty close to my specs except for the LSA.
Any insight on how my current cam would perform with the turbo? I don't want to spend extra money if I don't have to since I'll probably end up buying a larger cube forged short block next year.
if you're only going to 8psi I'd leave the engine alone.
the cometics will not change the static CR enough to really warrant the cost and the work. and a turbo cam would only increase the dynamic CR
I'm assuming 92 pump gas, and you're afraid it'll knock at 8psi with your current CR?
the cometics will not change the static CR enough to really warrant the cost and the work. and a turbo cam would only increase the dynamic CR
I'm assuming 92 pump gas, and you're afraid it'll knock at 8psi with your current CR?
Last edited by truckdoug; Oct 22, 2016 at 05:03 PM. Reason: added some reasoning
Yeah, was a little worried about knock. Compression according to a calculator is around 10.6 if I recall correctly.
I'll be running 93 pump gas. I'd love to go E85, but only a handful of stations up here carry it.
I'll be running 93 pump gas. I'd love to go E85, but only a handful of stations up here carry it.
well I can only say what I'd do. I'd leave the motor be, since it's known to be in good shape.
Then I'd build a nice hotside around it and that 78/76. spend my money on making sure things fit cleanly. A nice, well thought out install.
Then I'd run 8 psi and 13* timing keep the AFR on the fat side and let the plugs tell me what to do. Maybe methanol injection if my intake temps get to high.
That way I could have my turbo makin choo choo noises and learning how to tune it.
You can always build a motor on the stand as a back up.
Then I'd build a nice hotside around it and that 78/76. spend my money on making sure things fit cleanly. A nice, well thought out install.
Then I'd run 8 psi and 13* timing keep the AFR on the fat side and let the plugs tell me what to do. Maybe methanol injection if my intake temps get to high.
That way I could have my turbo makin choo choo noises and learning how to tune it.
You can always build a motor on the stand as a back up.
well I can only say what I'd do. I'd leave the motor be, since it's known to be in good shape.
Then I'd build a nice hotside around it and that 78/76. spend my money on making sure things fit cleanly. A nice, well thought out install.
Then I'd run 8 psi and 13* timing keep the AFR on the fat side and let the plugs tell me what to do. Maybe methanol injection if my intake temps get to high.
That way I could have my turbo makin choo choo noises and learning how to tune it.
You can always build a motor on the stand as a back up.
Then I'd build a nice hotside around it and that 78/76. spend my money on making sure things fit cleanly. A nice, well thought out install.
Then I'd run 8 psi and 13* timing keep the AFR on the fat side and let the plugs tell me what to do. Maybe methanol injection if my intake temps get to high.
That way I could have my turbo makin choo choo noises and learning how to tune it.
You can always build a motor on the stand as a back up.
I do have a 5.3 sitting on a stand, just in case I grenade the ls2.
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On The Tree
Joined: Jun 2015
Posts: 107
Likes: 0
From: Milwaukee Wisconsin
I said to replace springs =( like the first thing I said and someone said stock would be fine..was like nah get good ones valves kissing pistons is bad..
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Verdad Gallardo Like I said, it has BTR 660 lift dual springs right now, maybe around 8-9k miles on them, if that.
To be completely honest though, if I have to swap the springs, I'd rather just do a cam swap. I'll have the timing cover off anyways, so it's not that much more work to just put a new one in.
On The Tree
Joined: Jun 2015
Posts: 107
Likes: 0
From: Milwaukee Wisconsin
So......What springs would you guys recommend?
Like I said, it has BTR 660 lift dual springs right now, maybe around 8-9k miles on them, if that.
To be completely honest though, if I have to swap the springs, I'd rather just do a cam swap. I'll have the timing cover off anyways, so it's not that much more work to just put a new one in.
Like I said, it has BTR 660 lift dual springs right now, maybe around 8-9k miles on them, if that.
To be completely honest though, if I have to swap the springs, I'd rather just do a cam swap. I'll have the timing cover off anyways, so it's not that much more work to just put a new one in.