What rectangle port intake manifold for boost?
Thread Starter
On The Tree
Joined: Mar 2015
Posts: 153
Likes: 28
What rectangle port intake manifold for boost? I’m gathering parts for a l92 trans am turbo build.
- should I run refreshed 823s or splurge or get heads from Tony mamo?
- what intake is best for boost at high rpm? I’ll be doing a larger turbo for a linear powerband and high rpm.
- what turbo kit would you recommend? My goal is 700-800 whp.
im turned off prochargers. The Lsa blower doesn’t really fit.
- should I run refreshed 823s or splurge or get heads from Tony mamo?
- what intake is best for boost at high rpm? I’ll be doing a larger turbo for a linear powerband and high rpm.
- what turbo kit would you recommend? My goal is 700-800 whp.
im turned off prochargers. The Lsa blower doesn’t really fit.
Refreshed 823's will be fine.
BTR Equalizer intake or Holley High Ram if it will fit.
Gonna need a turbo with a big turbine for that 6.2 but even a smaller unit will hit 700-800whp.
What do you mean when you say high rpm?
I shift my 5.7 at 7,000-7,500rpm with an S484 and the 96mm turbine, it's a little big for my engine but once it comes online its a beast.
If you plan on shifting that high or higher, you'll need a 100+mm turbine.
I'm using the Huron Speed T6 kit and its great, fitment, quality, and support is excellent.
BTR Equalizer intake or Holley High Ram if it will fit.
Gonna need a turbo with a big turbine for that 6.2 but even a smaller unit will hit 700-800whp.
What do you mean when you say high rpm?
I shift my 5.7 at 7,000-7,500rpm with an S484 and the 96mm turbine, it's a little big for my engine but once it comes online its a beast.
If you plan on shifting that high or higher, you'll need a 100+mm turbine.
I'm using the Huron Speed T6 kit and its great, fitment, quality, and support is excellent.
For a goal of only 700-800 rwhp I would say use a stock LS3 intake and refreshed 823s. But I guess I should ask, what fuel and what is your definition of a larger turbo and higher RPM? You don't necessarily want/need a larger turbo and higher RPM for your power goal.
The LS3 intake was my initial thought too but then the OP said high rpm, although he didn't really define high rpm.
On The Tree
Joined: Oct 2012
Posts: 198
Likes: 33
Its really hard to beat the stock LS3 intake and at 700-800hp any intake that fits will get you there. You give up a lot of low end and midrange meat for a bit of power above 7000rpm with the short runner intakes. Unless you are stickshift or have a high stall and are going well above 7k I like the long runner intakes.
Trending Topics
Its really hard to beat the stock LS3 intake and at 700-800hp any intake that fits will get you there. You give up a lot of low end and midrange meat for a bit of power above 7000rpm with the short runner intakes. Unless you are stickshift or have a high stall and are going well above 7k I like the long runner intakes.
Plus, it makes traction at slower speeds less of an issue.
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
Stock intake will light the turbos faster. I would try the stock intake first and upgrade later if you need too. I don't think you will gain anything with bigger intake on boost on that combo. If you were going for like 9000rpm, then yes, but stock intake on boost will rev out better than you think.
Seems like a great time to watch this video and decide from there.
https://youtu.be/LnAO1rKg7Lg?si=WDbOOBxVmULY4qpT
https://youtu.be/LnAO1rKg7Lg?si=WDbOOBxVmULY4qpT
I have the holley low ram with the shearerfab intercooler intake. Pump E85. Homemade turbo kit with a vsracing 88/103 with the 1.45ar exhaust housing. Th400 and ptc specd converter. Boost comes online instantly, almost too fast. The camshaft will be a big factor in this also. I have the texasspeed stage 3 turbo cam, also running their ascast ls3 heads. At some point I will switch to a forced induction unit and maybe a bigger camshaft but ive barely scratched the surface of the current combo. Imo with the right converter any intake will work, I wouldn't go smaller than an 88/103 ish sized turbo. Should make 7-800hp at 10-12 psi.
Thread Starter
On The Tree
Joined: Mar 2015
Posts: 153
Likes: 28
highway sprints and curvy roads. 92 octane. E85 is no available in the Seattle area.
I have the holley low ram with the shearerfab intercooler intake. Pump E85. Homemade turbo kit with a vsracing 88/103 with the 1.45ar exhaust housing. Th400 and ptc specd converter. Boost comes online instantly, almost too fast. The camshaft will be a big factor in this also. I have the texasspeed stage 3 turbo cam, also running their ascast ls3 heads. At some point I will switch to a forced induction unit and maybe a bigger camshaft but ive barely scratched the surface of the current combo. Imo with the right converter any intake will work, I wouldn't go smaller than an 88/103 ish sized turbo. Should make 7-800hp at 10-12 psi.
For example: from a slow roll on the street 20-30mph, with my TH400 in first gear I can ride the brake a touch, mat the gas, as the converter flashes rpm and boost comes up the tires will break loose, I grab second and almost immediately third and now the tires are rolling smoke and I'm making small adjustments in the steering wheel to keep it straight for as long as I have the stones to keep the gas planted.
I'm son absolutely loves it and so do I lol.
This will be even easier for you with the 6.2 and the turbo suggested, since you'll make more power everywhere, keep your compression low, mine is around 9.0:1-9.5:1 iirc with a dished piston and CNC ported 317 heads.
As mentioned above, match the cam, converter and turbo and you won't be disappointed.
My intake is a Vic. Jr. (3,500-7,500 rpm band) with an Aaron's sheet metal elbow and 105mm TB and I'm not missing the low-end torque at all, my converter flashes right past it for the most part.
Smaller turbos can be fun, but they tend to light off much more violently, I'd rather be on the large side, have a more linear power band, easier to control down low with big top end pull but that's just me.
Hope this info helps!
I think I'd run the g45 size turbo or a clone and use the stock intake/heads if it's a manual car. You could probably make that power with a g42 turbo honestly, but higher backpressure will start to pay a role and hurt top end power some.
So I'm right about where @Lsxford is with my LS1/ FIS484 combo at 14lbs with pump gas fuel.
For example: from a slow roll on the street 20-30mph, with my TH400 in first gear I can ride the brake a touch, mat the gas, as the converter flashes rpm and boost comes up the tires will break loose, I grab second and almost immediately third and now the tires are rolling smoke and I'm making small adjustments in the steering wheel to keep it straight for as long as I have the stones to keep the gas planted.
For example: from a slow roll on the street 20-30mph, with my TH400 in first gear I can ride the brake a touch, mat the gas, as the converter flashes rpm and boost comes up the tires will break loose, I grab second and almost immediately third and now the tires are rolling smoke and I'm making small adjustments in the steering wheel to keep it straight for as long as I have the stones to keep the gas planted.
Stock LS3 intake manifold is all you need. I've made 1200rwhp with mine and done hundreds of passes without issues 5th gear pulls. While not ideal we have shifted it at 7500-7800rpm plenty of times.... It makes basically the same power it will at 6800-7000rpm.... it just flatlines and doesn't make any more when you rev it higher. For only 800rwhp you don't even need to port the heads but a performance valve job would not hurt.
I would run the L92 Inconnel exhaust valve which are $31 each from Summit if you want some extra precaution.
I would run the L92 Inconnel exhaust valve which are $31 each from Summit if you want some extra precaution.