[G.Maro.ZL1]

Originally Posted by drizzit

Is there a reason for going turbos? Staying with a SC would be a lot easier and most likely more plug and play for the power levels your looking for. IE out the box tunes, install, etc

Seen too many whipple/maggie/procharged camaros here, wanna be different. Plus I’ve always wanted a Twin Turbo V8 ��

[G.Maro.ZL1]

Originally Posted by KingLT1

The 224/230 115 or 227/233 115 would be my choices. I wouldn't go larger unless you plan on going with a larger stall converter.

Which would you choose out of the two? And for both those Cams are they 32%+ fuel lobe? And if you don’t mind what do the cam specs stand for? (Sorry am definitely still green)

[gtfoxy]

Either one of those would help easily reach your goals.

If it were me, running a stock-ish motor I’d go with the smaller of the 2.

It really depends on how much manifold pressure you want to use, type of fuel, & where those turbos will make the power (efficiently) in their compressor map.

Without seeing a map it’s hard to say, but I’d think something n a 67mm inducer would make it a tad easier to hit your power goal.

[Dan82679]

You need to check out CSP and Nick's (freedom rocket) videos on his gen 6 hellion twin turbo build. Your going to spend a ton of money going that route and you won't have to fueling to to get the hp you want.Your going to need port Injection or the XDI pump plus a lot of relocations in your engine bay.

[G.Maro.ZL1]

Originally Posted by Dan82679

You need to check out CSP and Nick's (freedom rocket) videos on his gen 6 hellion twin turbo build. Your going to spend a ton of money going that route and you won't have to fueling to to get the hp you want.Your going to need port Injection or the XDI pump plus a lot of relocations in your engine bay.

His video is what inspired my build, I know it won’t be cheap but it’ll be a bit different than going SC. I’m looking more into Port injection than the DI kit as it is a pricey for what they want compared to how cheap a port setup is. It definitely isn’t an all at once build, totally will be over time

[G.Maro.ZL1]

Originally Posted by gtfoxy

Either one of those would help easily reach your goals.

If it were me, running a stock-ish motor I’d go with the smaller of the 2.

It really depends on how much manifold pressure you want to use, type of fuel, & where those turbos will make the power (efficiently) in their compressor map.

Without seeing a map it’s hard to say, but I’d think something n a 67mm inducer would make it a tad easier to hit your power goal.

I was thinking of just going with the 62mm as I want something faster spooling, and definitely want it to build boost around the 3k rpm range.

[gtfoxy]

Originally Posted by G.Maro.ZL1

His video is what inspired my build, I know it won’t be cheap but it’ll be a bit different than going SC. I’m looking more into Port injection than the DI kit as it is a pricey for what they want compared to how cheap a port setup is. It definitely isn’t an all at once build, totally will be over time

I was going to comment that I bet you, like many, watched his stuff & got excited how cool it’d be.

Make no qualms, it’s an awesome build. Yet at the same time anyone not knowing the ins or outs of a pump gas turbo build would have next to zero understanding of the nuances that went into it. Little things that make a huge difference in a 416 strokes like that. Rod/stroke ratio, valve sizing, port flow rates & velocities, valve curtain & acceleration ramps, compressor & turbine side combination… the list goes on.

Someone might look at it & say “Hey, I could do that with a stock LT4 motor with more boost & fuel/octane.” Which is true, to a point, but it goes a lot deeper than that.

I’m not saying you can’t reach your goals. What I’m saying is it’s going to be a tad more complicated than slapping a dual 62mm kit on a stock LT4, even with port injection & making over 1K crank HP.

Originally Posted by G.Maro.ZL1

I was thinking of just going with the 62mm as I want something faster spooling, and definitely want it to build boost around the 3k rpm range.

That’s great, in theory, but the compressors need to be able to flow the air, efficiently, at the manifold pressure required to deliver enough air mass to make the power you desire.

Add: Turbine combination playes a larger part in boost response. Wheel size & design, turbine housing A/R & design, Center section bearing usage, & as well as the exhaust system itself.

It’s a system, through & through, each part relying on the other to do what it’s designed to do in a given application.

[G.Maro.ZL1]

Originally Posted by gtfoxy

I was going to comment that I bet you, like many, watched his stuff & got excited how cool it’d be.

Make no qualms, it’s an awesome build. Yet at the same time anyone not knowing the ins or outs of a pump gas turbo build would have next to zero understanding of the nuances that went into it. Little things that make a huge difference in a 416 strokes like that. Rod/stroke ratio, valve sizing, port flow rates & velocities, valve curtain & acceleration ramps, compressor & turbine side combination… the list goes on.

Someone might look at it & say “Hey, I could do that with a stock LT4 motor with more boost & fuel/octane.” Which is true, to a point, but it goes a lot deeper than that.

I’m not saying you can’t reach your goals. What I’m saying is it’s going to be a tad more complicated than slapping a dual 62mm kit on a stock LT4, even with port injection & making over 1K crank HP.


That’s great, in theory, but the compressors need to be able to flow the air, efficiently, at the manifold pressure required to deliver enough air mass to make the power you desire.

Add: Turbine combination playes a larger part in boost response. Wheel size & design, turbine housing A/R & design, Center section bearing usage, & as well as the exhaust system itself.

It’s a system, through & through, each part relying on the other to do what it’s designed to do in a given application.

With your knowledge, help me make this build work. I think it is definitely doable on a stock LT4 and I know it isn’t easy I understand you can’t just slap on turbos and hope you reach numbers. So list parts and pieces to help me build this up on a stock LT4, I know fueling is the priciest & biggest hurdle to overcome on these DI platform. What would you have in mind to make this work?

[Walt88]

I would personally go with the 224/230 115

[gtfoxy]

Originally Posted by G.Maro.ZL1

With your knowledge, help me make this build work. I think it is definitely doable on a stock LT4 and I know it isn’t easy I understand you can’t just slap on turbos and hope you reach numbers. So list parts and pieces to help me build this up on a stock LT4, I know fueling is the priciest & biggest hurdle to overcome on these DI platform. What would you have in mind to make this work?

You need to create a dialog between the company building the system & the one you choose to help you in tuning that includes a well thought out goal & budget.

From there you will see what’s possible, & not, with what you have to work with, budget wise, to reasonably achieve your goals.

A wise man realizes his limitations & seeks out those wiser than himself & takes counsel along the way.

[Camaro1973]

Originally Posted by Walt88

I would personally go with the 224/230 115

This is a very street friendly cam with -3 degrees of overlap. Honestly mine is 229/240 116 with 2.5 degrees of overlap and its perfectly fine and no stall needed.

[G.Maro.ZL1]

Originally Posted by gtfoxy

You need to create a dialog between the company building the system & the one you choose to help you in tuning that includes a well thought out goal & budget.

From there you will see what’s possible, & not, with what you have to work with, budget wise, to reasonably achieve your goals.

A wise man realizes his limitations & seeks out those wiser than himself & takes counsel along the way.

What tuners do you suggest? Would prefer a turbo build specialist as I do want custom tunes/maps on the go. My budget currently is 25k now, will pour more over time, definitely going with Hellion have started talking to them via FB. Goal is definitely 750-800 now, 900 being the end goal.

My list of purchases in order.
1. Cam & install with valve springs/rockers (Maybe shop install) I would like port heads since I am going in there anyways but I have no idea about the port specs and it changes everything else, which is what shied me away from doing the heads as I already don’t know cam specs. >@_@ >
2. Billet aluminum Procharger intake
3. NW 103mm TB
4. Hellion kit (Maybe 64mm or 67mm)
5. Full exhaust W/O Cats to maximize the turbos
6. Mighty mouse catchcan
7. Tuned for that current setup
8. Still deciding fueling route may stay DI, leaning more towards PORT tho. Ofc this is after what is left of my 25k budget.
9. All labor/wrenching time will be my dad, friends, and myself.

Feel free to pitch in tips/advice, it all is appreciated this will be my first time doing this much work on a vehicle.

[G.Maro.ZL1]

Originally Posted by Camaro1973

This is a very street friendly cam with -3 degrees of overlap. Honestly mine is 229/240 116 with 2.5 degrees of overlap and its perfectly fine and no stall needed.

How to tell/know that specific cam is 32%+ fuel lobe? As I am only doing the cam for air/fueling reasons which the stock cam can’t provide enough.

[laynlo15]

I must say I'm still bewildered why a person buys a Zl1 and gets rid of the PD blower to add twin or single turbos. I love turbos and probably the coolest to watch at the drag strip but why start out with a 65000 Zl1. Start out with a Camaro that's sometimes half the price. I know everyone will say its a forged motor, yes it is but the Camaro Lt1 is also forged except for the piston and its pretty cost effected to change those to forged drop ins. So instead of having 85,000 in a Camaro Zl1 you have 50 or 55k in a Camaro SS that's lighter in weight by a 100 lbs or so. Your just going to get killed on resale and the Zl1 is really holding its value right now as well is the Camaro SS. Believe me I know what it costs to build one of these Camaro's so I'm very familiar with the cost of changing the fuel systems, short blocks, heads etc. and what is required to make one go fast. Just my 2 cents which sometimes isn't worth anything.