[geerbangr]

First off let me say hello to the forum members and the site moderators ,i'm looking forward to the help this board has offered many others.

Here are my thoughts , I have a 91 S dime i've been palying with ,sbc power plant .I'm getting kinda bored with the single carb power so now i'm turning to a turbo for some serious power .

I'm not new to the mechanics world by no means ,but, I am new to the turbo world . That's what brings me here .....education .

I'm thinking about a 377c.i. sbc build over the winter months and my projected power is around 900 to 1000 hp .

I don't understand all the aspects of the turbo charger ,i've been lurking around the board for a while trying to educate myself so please bare with me if some of my questions sound silly.

Should I use a single turbo or twins to achieve the desired power level ?

I plan on a blow thru carb system , is that ok ?

I don't understand what i've been reading about water/meth injection ?? Could someone please shed some light on what this system is used for ?

What kind of turbo or turbos would I need to purchase for this build ?

I understand I need blow off valve or valves ?

I think i'll leave things where they are now and wait for some answers before I continue with more questions .

[Robert]

Originally Posted by geerbangr

First off let me say hello to the forum members and the site moderators ,i'm looking forward to the help this board has offered many others.

Here are my thoughts , I have a 91 S dime i've been palying with ,sbc power plant .I'm getting kinda bored with the single carb power so now i'm turning to a turbo for some serious power .

I'm not new to the mechanics world by no means ,but, I am new to the turbo world . That's what brings me here .....education .

I'm thinking about a 377c.i. sbc build over the winter months and my projected power is around 900 to 1000 hp .

I don't understand all the aspects of the turbo charger ,i've been lurking around the board for a while trying to educate myself so please bare with me if some of my questions sound silly.

Should I use a single turbo or twins to achieve the desired power level ?

I plan on a blow thru carb system , is that ok ?

I don't understand what i've been reading about water/meth injection ?? Could someone please shed some light on what this system is used for ?

What kind of turbo or turbos would I need to purchase for this build ?

I understand I need blow off valve or valves ?

I think i'll leave things where they are now and wait for some answers before I continue with more questions .

The decision on single or twins is really dependent on what you want to do. Either config has the capability to get you where you want to be for roughly the same expense and with very near to identical results. One thing I would think of here is space constraints. Keep in mind that if you choose a single you will need a turbo that requires quite a bit of space to make 1000 HP. Conversely if you run twins the turbos are smaller since there are two of them but you will need space on either side of the motor for each of them so the space requirements for two might actually be more even through each one is smaller than the single.

Blow through or draw through is really your preference again although my preference would be blow through. Especially if you plan to run EFI via something like an Edelbrock Pro EFI system. That basically makes blow through a lot more reliable as the issues of pressurizing the Carb bowl and jets output is gone with injectors feeding the fuel.

Water/meth injection does just like what it sounds like. At a pre-determined load range or boost pressure a nozzle and pump are activated to spray a mixture of water and methanol into the motor. This spray is atomized of course. In essence what this mixture does is to cool the cylinders down which decreases cylinder pressure and cylinder temps reducing the risk of pre-detonation. it in effect acts like an increase in fuel octane. If you know how fuel ratings work in that the higher the octance the more resistance to pre-ignition than this will make more sense.

The kind of turbo you choose will depend on what your ultimate setup preference is. A pair of GT-K 500 or 60-1 or 62-1 compressors with T3 Stage 3 or Stage 5 turbines will easily make the required 1000 HP. Conversely a Super T76 or GT-K 1000 woould also make the required horespower.

Yes you will need valves. The kind is standard the quantity depends on the setup. The first kind of valve you need is a wastegate. A wastegate is essentially a diverter valve for the exhaust gas. It is placed upstream of the turbine inlet somewhere and when the desired boost pressure is reached from the turbo it opens allowing some of the exhaust gas to bypass the turbine section of the turbo. This has the effect of limiting the boost pressure the turbo produces to the amount you are asking it to produce. If you run a twin turbo set up you will need two of these. If you run a single turbo you will only need one but it will need to be larger than the two you would have needed to run a twin setup. The second valve you need is a Bypass or Blow Off valve. This valve is also a diverter valve but its purpose is to allow pressurized air from the compressor outlet of the turbo to either vent to atmosphere or back into the intake track in front of the compressor inlet. The point is to prevent compressir surge from occuring when you close the throttle plate.

These explanations could be come much more complicated and intricate or much easier depending on your pre-existing knowledge of the way motors and air under pressure works. I would recommend you grab a copy of Maximum Boost by Corkey Bell and take a read. In fact when you read it the first time go back and read it again and make notes. Its a bit dated on technology but its fundamental theories on turbocharger design are invaluable to someone looking to turbocharge a car.

[geerbangr]

Thank you for the reply Robert , your knowledge is priceless .

I'm with you so far , a little confused on a couple of topics but i'm sure you can help clarify .

I am a little cramped for room under the hood of my dime so I believe a single turbo would be the best route to take .

I think blow thru carb is the route i'm going to take , maybe efi i'll have to make that decision when the time comes . The issues of pressurizing the bowls will have to be dealt with if I choose to stay with a carb .

The water/meth injection i'm still a little in the dark about , how do you know if it's needed ? Put the system together and monitor engine gasses ?

I believe the GT-K-1000 will be the turbo of choice . How do I know which wastegate and which blow off valve I would need to use with this turbo ?

I see you guys list an array of blow off valves and wastegates I just need to know which valves work the best with the GT-K-1000 turbo .

What kind of boost pressure will this turbo need to produce to achieve the 1000 hp mark ?

I see boost controllers listed as well , I assume the controllers do as they are stated .To control boost pressure which in turn controls the amount of power the engine will make , correct ?

And a few exhaust questions as well . Is there a minimum header tube requirement for this specific turbo as well as others ?

The exhaust pipes that feed the turbo , do they have to be at equal lengths to feed the same amount of input into the turbo from each side of the engine ?

[Robert]

Originally Posted by geerbangr

Thank you for the reply Robert , your knowledge is priceless .

I'm with you so far , a little confused on a couple of topics but i'm sure you can help clarify .

I am a little cramped for room under the hood of my dime so I believe a single turbo would be the best route to take .

I think blow thru carb is the route i'm going to take , maybe efi i'll have to make that decision when the time comes . The issues of pressurizing the bowls will have to be dealt with if I choose to stay with a carb .

The water/meth injection i'm still a little in the dark about , how do you know if it's needed ? Put the system together and monitor engine gasses ?

I believe the GT-K-1000 will be the turbo of choice . How do I know which wastegate and which blow off valve I would need to use with this turbo ?

I see you guys list an array of blow off valves and wastegates I just need to know which valves work the best with the GT-K-1000 turbo .

What kind of boost pressure will this turbo need to produce to achieve the 1000 hp mark ?

I see boost controllers listed as well , I assume the controllers do as they are stated .To control boost pressure which in turn controls the amount of power the engine will make , correct ?

And a few exhaust questions as well . Is there a minimum header tube requirement for this specific turbo as well as others ?

The exhaust pipes that feed the turbo , do they have to be at equal lengths to feed the same amount of input into the turbo from each side of the engine ?

Water/Meth injection is not typically ever a required set up. It is an additional item which gives you a greater range of tuning ability and a measure of safety when you are making large amounts of power but there are plenty of setups out there that don't have it. It really depends on what you want to do. The investment for the system is relatively minor in comparison to the safety it provides for the engine.

For the amount of power you are going to be making you will need to run at the least a Newgen wastegate if you are going to run single turbo and I would recommend the Godzilla BOV given the boost pressure you will be running.

I can't tell you the exact pressure without knowing the flow rate of your motor or its Ve but count on more than 20 PSI to make 1000 HP.

Boost controllers do exactly as they are named. They allow you to adjust the amount of boost you are making by the turn of a knob or push of a button. It allows you to run low boost for the street and quickly and easily carnk up the boost when you hit the track. Additionally most electronic boost controller will improve the wastegate response to pressure changes and actually speed up and more accurately control boost pressures. You don't need one as the wastegate will do this with or without a controller but a controller will make the wastegate much more responsive.

There is no minimum length or requirement of equal length for the turbo manifold. Equal length manifolds will certainly help but its not required.

[geerbangr]

Ok Robert thanks for the help so far .

GT-K-1000 turbo
NewGen wastegate
Godzilla blow off valve
Water/meth system , looks like cheap insurance
Boost controller for sure

The above mentioned looks like the start of a good package ?

How about SS headers for the sbc application , do you guys sell them or will I need to fabricate them myself ?

Is an intercooler necessary ? I understand that wil help cool the charge into the engine ?

How do you monitor the engine O2 running a carb setup ?

Your engine tuning is according to the engines needs in relation to the O2 sensor ?

[Robert]

Originally Posted by geerbangr

Ok Robert thanks for the help so far .

GT-K-1000 turbo
NewGen wastegate
Godzilla blow off valve
Water/meth system , looks like cheap insurance
Boost controller for sure

The above mentioned looks like the start of a good package ?

How about SS headers for the sbc application , do you guys sell them or will I need to fabricate them myself ?

Is an intercooler necessary ? I understand that wil help cool the charge into the engine ?

How do you monitor the engine O2 running a carb setup ?

Your engine tuning is according to the engines needs in relation to the O2 sensor ?

The above mentioned is the start of a great package. Turbonetics doesn't make headers or turbo manifolds for the SBC but there are tons of them on the market. They don't need to be Stainless by the way. Cast iron works fine too. While an intercooler isn't necessary techinically I would never run a turbocharged motor without one. If you are short on funds buy the intercooler and skip the water/meth kit. As for monitoring the Air Fuel Ratio which I assume you are referring to I would put a wideband O2 on each bank and monitor the Air Fuel Ratio that way. If you don't have the funds for two one after the turbo will work ok as long as you understand that you will be getting an average AFR for both banks and that one bank might be running richer or leaner than the other.

[geerbangr]

Sounds great Robert . As far as the intercooler goes I have a connection on getting on built for a resonable price , so I will run one .

Monitoring the Air fuel ratio , do you guys sell a kit to monitor both banks ?

I will be checking in from time to time with more questions , but more reading up on the board frequently to further educate myself .

[Robert]

Originally Posted by geerbangr

Sounds great Robert . As far as the intercooler goes I have a connection on getting on built for a resonable price , so I will run one .

Monitoring the Air fuel ratio , do you guys sell a kit to monitor both banks ?

I will be checking in from time to time with more questions , but more reading up on the board frequently to further educate myself .

Unfortunately we don't have a wideband kit. It's a bit outside the scope of the products we build. I would recommend Innovate Motorsports, AEM, or my personal favorite the Dynojet Wideband Commander. The main difference on the Dynojet model is that its an analog gauge which allows you to watch transitional AFR's while you are dirving without having to datalog the O2.

[ash]

Originally Posted by Robert

Unfortunately we don't have a wideband kit. It's a bit outside the scope of the products we build. I would recommend Innovate Motorsports, AEM, or my personal favorite the Dynojet Wideband Commander. The main difference on the Dynojet model is that its an analog gauge which allows you to watch transitional AFR's while you are dirving without having to datalog the O2.

x2 on innovate
i use one..
good product
1 bank logged, but have provision to change sides..

currently use twins on my sbc
hp 66's

tested twin 57's , gtk 550 , gtrk 1000
all on 350 ish cub es , sbc


turbonetics a good product

cheers
ash