Turbo cam from COMP. Does this seem too small??
Thread Starter
Staging Lane
Joined: Jun 2005
Posts: 62
Likes: 0
Turbo cam from COMP. Does this seem too small?? So me and my bro are builing a turbo 388 sbc. eE've already got the short block done. Eagle 4340 crank, 4340 rods + L-19 bolts, SRP blower pistons, C&A Stainless steel rings, billet main caps.
We've got some Protopline heads, 235cc, 72cc chambers giving 8.4:1 and here's what they flow.
Intake Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
68.19 135.59 192.17 256.42 292.35 310.49 318.00
Exhaust Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
58.79 118.53 162.94 182.42 194.01 198.92 205.97
We have a solid roller cam that comp suggested to us, but i't seems like we could do a bit better.
242/236 .608"/.602" (1.6), 114 lsa. Does that exhaust lobe seem small if we're shooting for 850-900 crank hp?
We haven't gotten the turbo yet, but its probably going to be a t76, with ~ 1.4 exhaust A/R, running what ever intake pressure neessary to get to our goal. We haven't really decided if we're going to run an intercooler, or just meth. and pump gas. The front of the truck does not adhere too well to a thick intercooler. It looks like maybe would could get by with about 2.5-3" thick, and only 13" tall, but can but up to ~30" long.
I'm mostly concerned about the cam, but other suggestions are welcome too.
We've got some Protopline heads, 235cc, 72cc chambers giving 8.4:1 and here's what they flow.
Intake Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
68.19 135.59 192.17 256.42 292.35 310.49 318.00
Exhaust Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
58.79 118.53 162.94 182.42 194.01 198.92 205.97
We have a solid roller cam that comp suggested to us, but i't seems like we could do a bit better.
242/236 .608"/.602" (1.6), 114 lsa. Does that exhaust lobe seem small if we're shooting for 850-900 crank hp?
We haven't gotten the turbo yet, but its probably going to be a t76, with ~ 1.4 exhaust A/R, running what ever intake pressure neessary to get to our goal. We haven't really decided if we're going to run an intercooler, or just meth. and pump gas. The front of the truck does not adhere too well to a thick intercooler. It looks like maybe would could get by with about 2.5-3" thick, and only 13" tall, but can but up to ~30" long.
I'm mostly concerned about the cam, but other suggestions are welcome too.
TECH Regular
Joined: Nov 2001
Posts: 409
Likes: 0
Originally Posted by menlatin
So me and my bro are builing a turbo 388 sbc. eE've already got the short block done. Eagle 4340 crank, 4340 rods + L-19 bolts, SRP blower pistons, C&A Stainless steel rings, billet main caps.
We've got some Protopline heads, 235cc, 72cc chambers giving 8.4:1 and here's what they flow.
Intake Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
68.19 135.59 192.17 256.42 292.35 310.49 318.00
Exhaust Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
58.79 118.53 162.94 182.42 194.01 198.92 205.97
We have a solid roller cam that comp suggested to us, but i't seems like we could do a bit better.
242/236 .608"/.602" (1.6), 114 lsa. Does that exhaust lobe seem small if we're shooting for 850-900 crank hp?
We haven't gotten the turbo yet, but its probably going to be a t76, with ~ 1.4 exhaust A/R, running what ever intake pressure neessary to get to our goal. We haven't really decided if we're going to run an intercooler, or just meth. and pump gas. The front of the truck does not adhere too well to a thick intercooler. It looks like maybe would could get by with about 2.5-3" thick, and only 13" tall, but can but up to ~30" long.
I'm mostly concerned about the cam, but other suggestions are welcome too.
We've got some Protopline heads, 235cc, 72cc chambers giving 8.4:1 and here's what they flow.
Intake Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
68.19 135.59 192.17 256.42 292.35 310.49 318.00
Exhaust Port Test Data @28" of water
.100 .200 .300 .400 .500 .600 .700
58.79 118.53 162.94 182.42 194.01 198.92 205.97
We have a solid roller cam that comp suggested to us, but i't seems like we could do a bit better.
242/236 .608"/.602" (1.6), 114 lsa. Does that exhaust lobe seem small if we're shooting for 850-900 crank hp?
We haven't gotten the turbo yet, but its probably going to be a t76, with ~ 1.4 exhaust A/R, running what ever intake pressure neessary to get to our goal. We haven't really decided if we're going to run an intercooler, or just meth. and pump gas. The front of the truck does not adhere too well to a thick intercooler. It looks like maybe would could get by with about 2.5-3" thick, and only 13" tall, but can but up to ~30" long.
I'm mostly concerned about the cam, but other suggestions are welcome too.
There are people with lt1 and ls1's making over 1000 flyweel hp and even over 1000 at the wheels with cams that are 218 or 224 duration, and they are hydraulic rollers . Some are on this forum. I imagine if you want a bigger cam, a solid roller is the way to go though, especially if you already have the parts , but that cam actually seems big for 850 - 900 fwhp, or even for 850-900 at the wheels, but I guess you could just run less boost to make the power . Although like someone said above it will be more streetable with something smaller. Unless it's a race car, and/or you just wanted to bleed of some torque or have something that revs higher.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Staging Lane
Joined: Jun 2005
Posts: 62
Likes: 0
i was actually hoping to get more revs. i entered the #'s into desktop dyno and it basically told me max hp @ 6k and then trailing fast from then. I was little upset over that, but are you saying that maybe i could take it to 7k?
Also, a little less torque down low woldn't be so bad, as that way we'd still be able to maintain some traction on the street.
Also, a little less torque down low woldn't be so bad, as that way we'd still be able to maintain some traction on the street.
One thing I have noticed is that most of the turbo cars, but not the max effort race cars, peak at like 6000-6200 rpms. I am a turbo newbie, so my guess is that's it's a combination of cam shaft, turbo size, and intake restrictions. If you want to rev to 7000 rpms you need to talk to Y2khawk, OH Boyz, 427, and other folks who have built combos that make power up there.
If you decide to build a 6200 peak hp combo I would not go solid.
If you decide to build a 6200 peak hp combo I would not go solid.
Thread Starter
Staging Lane
Joined: Jun 2005
Posts: 62
Likes: 0
ok, another question, but about the heads. I just finished cleaning up around the valve seats (sharp edges) and cleaning up the whole exhuast port. Should i go ahead and D-Shape the exhuast port? or just leave the square port? I have a little experience in head porting already, as i got a set of Gm 441's to lfow 284/237 with 2.05/1.60 valves, i just dont know how opening the ehuast will effect the spooling of the turbo.