Turbo cam?
Lot of good info on Summit Racing cams, including with turbos, with a quick search. Your goals will determine the stage but they've got what you need. You can compare your existing cam to theirs and they have a cam calculator as well to play with.
Only if you run them at baby back pressure ratios! 
Put a big "NA" cam with a typical 2:1 or worse BP ratio setup and suddenly that statement is BS. That RH fella runs some baby boost with wildly inflated numbers compared to what you'd see at the wheels on a standard setup.
Put a big "NA" cam with a typical 2:1 or worse BP ratio setup and suddenly that statement is BS. That RH fella runs some baby boost with wildly inflated numbers compared to what you'd see at the wheels on a standard setup. 
Thread Starter
On The Tree
Joined: Nov 2015
Posts: 171
Likes: 5
Only if you run them at baby back pressure ratios! Put a big "NA" cam with a typical 2:1 or worse BP ratio setup and suddenly that statement is BS. That RH fella runs some baby boost with wildly inflated numbers compared to what you'd see at the wheels on a standard setup.
Put a big "NA" cam with a typical 2:1 or worse BP ratio setup and suddenly that statement is BS. That RH fella runs some baby boost with wildly inflated numbers compared to what you'd see at the wheels on a standard setup.so what do you recommend?
Not exactly false, just has some guidelines Richard tends to not mention that apply to real world application. It's hard to suggest anything without a ton more info on the setup. Give us all the details and I'm sure you'll have plenty of suggestions. Generally not a night/day difference between most suggestions with similar valve events. But I'm sure we could get you close. I'm by no means a "cam guy". But I've played with quite a few so I have some general experience.
Trending Topics
If you reach out to the guys at Summit or tag them on this post they'll chime in.
They claim to have done a ton of R&D developing these cams and I think for the average street/race hobby enthusiast they'll work just fine.
With that said if you're going through all the work to install a turbo charger on your car, I would certainly want a cam that would optimize the combination.
Smallwood Racing Developement
LJMS/BTR
Brute Speed
Summit
Can't go wrong with any of these.
They claim to have done a ton of R&D developing these cams and I think for the average street/race hobby enthusiast they'll work just fine.
With that said if you're going through all the work to install a turbo charger on your car, I would certainly want a cam that would optimize the combination.
Smallwood Racing Developement
LJMS/BTR
Brute Speed
Summit
Can't go wrong with any of these.
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
On The Tree
Joined: Nov 2015
Posts: 171
Likes: 5
Not exactly false, just has some guidelines Richard tends to not mention that apply to real world application. It's hard to suggest anything without a ton more info on the setup. Give us all the details and I'm sure you'll have plenty of suggestions. Generally not a night/day difference between most suggestions with similar valve events. But I'm sure we could get you close. I'm by no means a "cam guy". But I've played with quite a few so I have some general experience.
Thread Starter
On The Tree
Joined: Nov 2015
Posts: 171
Likes: 5
FWIW Difference between E85 And E50 is like .2 octane (not 2 but .2) E70 is a great blend and won't require as much from your fuel system at E85. I'd run it if its available would make hitting your goal very easy. I wish I knew my BP I run the same turbos on a 5.3 and just haven't had the time to setup the sensor to read BP yet. My 5.3 is around 8.9:1 with no IC an I made 560/600 whp on 11-12lbs. Figure I'm down a good 50whp from no IC, small cam, and the lack of compression. I run it on 19lbs now (about E60 fuel) and I'd say it easily makes 700whp. (auto trans though). That's with a relatively small GM hot cam as well.
Since it's a manual I'd want it to be snappy down low. Your goals are pretty mild and you won't be revving it that high. Something in the STG2 summit line would work well. But IMO a tighter LSA and shorter duration would work even better for a manual setup. I generally ignore response and low end with an auto, but I've driven a few turbo manual cars with sloppy STG2 cams and it wasn't great!
Something like the TSP stg 2 or 3 high lift cams on the optional tighter 110 LSA. Also ask them how far you can advance that cam when you install it and do so.
https://www.texas-speed.com/p-8558-t...-camshaft.aspx
Since it's a manual I'd want it to be snappy down low. Your goals are pretty mild and you won't be revving it that high. Something in the STG2 summit line would work well. But IMO a tighter LSA and shorter duration would work even better for a manual setup. I generally ignore response and low end with an auto, but I've driven a few turbo manual cars with sloppy STG2 cams and it wasn't great!
Something like the TSP stg 2 or 3 high lift cams on the optional tighter 110 LSA. Also ask them how far you can advance that cam when you install it and do so.
https://www.texas-speed.com/p-8558-t...-camshaft.aspx
Last edited by Forcefed86; Feb 1, 2021 at 12:46 PM.
Thread Starter
On The Tree
Joined: Nov 2015
Posts: 171
Likes: 5
FWIW Difference between E85 And E50 is like .2 octane (not 2 but .2) E70 is a great blend and won't require as much from your fuel system at E85. I'd run it if its available would make hitting your goal very easy. I wish I knew my BP I run the same turbos on a 5.3 and just haven't had the time to setup the sensor to read BP yet. My 5.3 is around 8.9:1 with no IC an I made 560/600 whp on 11-12lbs. Figure I'm down a good 50whp from no IC, small cam, and the lack of compression. I run it on 19lbs now (about E60 fuel) and I'd say it easily makes 700whp. (auto trans though). That's with a relatively small GM hot cam as well.
Since it's a manual I'd want it to be snappy down low. Your goals are pretty mild and you won't be revving it that high. Something in the STG2 summit line would work well. But IMO a tighter LSA and shorter duration would work even better for a manual setup. I generally ignore response and low end with an auto, but I've driven a few turbo manual cars with sloppy STG2 cams and it wasn't great!
Something like the TSP stg 2 or 3 high lift cams on the optional tighter 110 LSA. Also ask them how far you can advance that cam when you install it and do so.
https://www.texas-speed.com/p-8558-t...-camshaft.aspx
Since it's a manual I'd want it to be snappy down low. Your goals are pretty mild and you won't be revving it that high. Something in the STG2 summit line would work well. But IMO a tighter LSA and shorter duration would work even better for a manual setup. I generally ignore response and low end with an auto, but I've driven a few turbo manual cars with sloppy STG2 cams and it wasn't great!
Something like the TSP stg 2 or 3 high lift cams on the optional tighter 110 LSA. Also ask them how far you can advance that cam when you install it and do so.
https://www.texas-speed.com/p-8558-t...-camshaft.aspx
https://www.texas-speed.com/p-8574-t...turbo-cam.aspx
Last edited by parrisw; Feb 1, 2021 at 01:08 PM.
I didn’t think you’d want that close of LSA. I figured you’d want like 114 for a turbo setup. But I can easily be wrong in my thinking. That link isn’t a turbo cam. They list a few 5.3 turbo cams.
https://www.texas-speed.com/p-8574-t...turbo-cam.aspx
https://www.texas-speed.com/p-8574-t...turbo-cam.aspx
It depends on the amount of overlap. Since you aren't revving it very high and using a stock manifold, theres no reason for alot of duration IMO. By limiting the duration and tightening the LSA it makes for a much snappier engine which is huge with a manual car IMO. The TSP cam I posted has negative 3* of overlap at .050. It will still be very "boost friendly" and tolerant of back pressure
You have 8* of positive overlap in your current "NA" cam. The summit STG2 has 2* of positive overlap. So the cam I suggested with the tighter LSA is more "boost friendly" in terms of overlap than either of those and will give quite a bit more low end performance.
I believe you'll be fine back pressure wise, and likely the cam you have will work ok. But it won't be "snappy" down low like the cam I suggested. Which IMO is a big deal with a manual car. Its really a night/day difference in response. They even sound better IMO with a tight LSA. More raspy and mean. Will also have a more aggressive overlap. I'd run a 109 LSA on that TSP cam if it were on an option.... you might ask them.
Last edited by Forcefed86; Feb 1, 2021 at 02:45 PM.
Toss those 4.11's and put in some 3.55's or even 3.23's.
I ran 3.73's with my T56 and I think 3.55's would have been just a little bit better.
4.11's with a six speed and turbo is useless.
I ran 3.73's with my T56 and I think 3.55's would have been just a little bit better.
4.11's with a six speed and turbo is useless.
Thread Starter
On The Tree
Joined: Nov 2015
Posts: 171
Likes: 5
That's just a generalization to overlap.
It depends on the amount of overlap. Since you aren't revving it very high and using a stock manifold, theres no reason for alot of duration IMO. By limiting the duration and tightening the LSA it makes for a much snappier engine which is huge with a manual car IMO. The TSP cam I posted has negative 3* of overlap at .050. It will still be very "boost friendly" and tolerant of back pressure
You have 8* of positive overlap in your current "NA" cam. The summit STG2 has 2* of positive overlap. So the cam I suggested with the tighter LSA is more "boost friendly" in terms of overlap than either of those and will give quite a bit more low end performance.
I believe you'll be fine back pressure wise, and likely the cam you have will work ok. But it won't be "snappy" down low like the cam I suggested. Which IMO is a big deal with a manual car. Its really a night/day difference in response. They even sound better IMO with a tight LSA. More raspy and mean. Will also have a more aggressive overlap. I'd run a 109 LSA on that TSP cam if it were on an option.... you might ask them.
It depends on the amount of overlap. Since you aren't revving it very high and using a stock manifold, theres no reason for alot of duration IMO. By limiting the duration and tightening the LSA it makes for a much snappier engine which is huge with a manual car IMO. The TSP cam I posted has negative 3* of overlap at .050. It will still be very "boost friendly" and tolerant of back pressure
You have 8* of positive overlap in your current "NA" cam. The summit STG2 has 2* of positive overlap. So the cam I suggested with the tighter LSA is more "boost friendly" in terms of overlap than either of those and will give quite a bit more low end performance.
I believe you'll be fine back pressure wise, and likely the cam you have will work ok. But it won't be "snappy" down low like the cam I suggested. Which IMO is a big deal with a manual car. Its really a night/day difference in response. They even sound better IMO with a tight LSA. More raspy and mean. Will also have a more aggressive overlap. I'd run a 109 LSA on that TSP cam if it were on an option.... you might ask them.
thanks for the info! Good explanation.
Thread Starter
On The Tree
Joined: Nov 2015
Posts: 171
Likes: 5
I agree. But with the .5:1 6th. It makes 6 useless. With 4:11 the gearing takes it to 330kmh. 3:55 would be better for sure.
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,233
Likes: 1,522
From: Ohio, Georgia, Nevada, Texas
Hello Gentlemen. How can we help? OP, the basic story on the Pro LS turbo cams is the run the same intake lobe and valve events as our N.A. cams and the exhaust opening point is often the same as well. Where they differ is we close the exhaust valve a bit earlier and soften the lobe just a bit. This reduction in overlap is needed to offset the increase in reversion seen with most single turbos with T4 hotsides and full length exhaust system. They are American made and extremely high quality in manufacture. Here's an article on that. Here is a little bit on how the stage 1-4 cams are designed in increments and around lifts required by factory rockers and common .600 beehive and .660 dual spring packs. Here's an article that goes into a little more detail on the truck and turbo cams. We also have another on specific valve events and how they affect performance. Turbo Cams don't have a lot of overlap of course so you're not going to get the idle of our N.A. cams, but then again you don't get melted down pistons etc. either 
. At your weight, manual trans etc. the Stage 3 is the one we'd lean toward. Either the 2 or 3 have been well past 1000whp though so if you are looking for a bit better spool, the 2 would be a little easier to bring on boost.
. At your weight, manual trans etc. the Stage 3 is the one we'd lean toward. Either the 2 or 3 have been well past 1000whp though so if you are looking for a bit better spool, the 2 would be a little easier to bring on boost. 
Teching In
Joined: Jan 2021
Posts: 6
Likes: 0
Hello Gentlemen. How can we help? OP, the basic story on the Pro LS turbo cams is the run the same intake lobe and valve events as our N.A. cams and the exhaust opening point is often the same as well. Where they differ is we close the exhaust valve a bit earlier and soften the lobe just a bit. This reduction in overlap is needed to offset the increase in reversion seen with most single turbos with T4 hotsides and full length exhaust system. They are American made and extremely high quality in manufacture. Here's an article on that. Here is a little bit on how the stage 1-4 cams are designed in increments and around lifts required by factory rockers and common .600 beehive and .660 dual spring packs. Here's an article that goes into a little more detail on the truck and turbo cams. We also have another on specific valve events and how they affect performance. Turbo Cams don't have a lot of overlap of course so you're not going to get the idle of our N.A. cams, but then again you don't get melted down pistons etc. either . At your weight, manual trans etc. the Stage 3 is the one we'd lean toward. Either the 2 or 3 have been well past 1000whp though so if you are looking for a bit better spool, the 2 would be a little easier to bring on boost.
. At your weight, manual trans etc. the Stage 3 is the one we'd lean toward. Either the 2 or 3 have been well past 1000whp though so if you are looking for a bit better spool, the 2 would be a little easier to bring on boost. LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,233
Likes: 1,522
From: Ohio, Georgia, Nevada, Texas