OK I will thread jack I have only rode friends harleys one FLH hog,
one FXRS one sportster to slow for my blood. $17000 for 60HP
80 ftl bs torque. I guess you could spend another 5 thousand
trying to get one to run in a strait line.

 

most of the companies responsible for this conversion have gone to the wall,Gemini turbosystems inc (intake and exhaust plumbing) Rajay got swallowed up by Roto-Master and then Garrett, everything fits pretty well no major upheaval,output good nothing on paper yet(booked dyno and track time early August)
added a few more pics
http://i79.photobucket.com/albums/j1...e/IMGA0269.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0267.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0262.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0259.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0257.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0246.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0245.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0271.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0244.jpg
http://i79.photobucket.com/albums/j1...e/IMGA0243.jpg

 

there were a couple of popular systems like the above gemini system, they were the accel turbosobnic and the martin kits. All draw through.

Turbovette, do you have larger pics of your car? I'd like to see them.

 

Thats a neat looking system. I guess I just don't undestand how the system pressurizes....? If the boost is coming in under the throttle blades and the carb is not sealed, how is the air not just blowing where ever it wants to go? Meaning up and out of the throttle bores? Atleast on a blow through system, the boost is coming in from the top of the carb and its sealed, it has no where to go but down the carb. To me that draw through type seems like it would just be a big boost leak.


Boost leaks suck.


Remember when the Calloways came out with the twin turbo/intercooled, I thought those were THE BADDEST cars ever. In reality, they didn't make much power considering what they had. I still love turbos though..... Thought about doing a turbo on my 99 TA but....$$$

 

as i understand the system, the area under the carb is not a straight shot to the intake manifold. instead, it simply places the carb in a relatively stock location. there is a separation like this:


| |
carb
| |_____
_________TURBO
..............| |
_________| |
INTAKE_____|
| |
| |



they're just sandwiched together

 

it's only draw through when the turbo makes boost, there are flapper valves inside the plenum, when there's no boost it's a straight shot from carb to manifold, bypassing the turbo.

 

so what are the benifits of going between a draw through and a normal turbo setup? How do they compare in cost? I want a decent reliable system- but I have limited cash flow. Is one easier than the other to install or fabricate? Would i have to custom fabricate the setup for the draw through system- or is there places that sell piping,etc?

 

dynasis, try Gail Banks. I believe its Banks Diesel Power. Google em. They make a twin turbo kit for a SBC that is really nice and good for 900-1000hp. I would not mess with the old draw through types. They were way ahead of their time when they came out but to be honest, its old school technology. If you are staying carbed, go with a blow through type that pressurizes the carb.

One thing I will tell you is that there is NOTHING cheap about turboing. They are expensive to build/fab and can melt a set of pistons QUICK if the tune is not just right or you get some bad gas etc. Do your homework on turbo charging. Its a lot more involved then you think. I have been building and install turbos on hayabusas for about 2 yrs. Even with fuel injection tuning them is tough and they are inconsistant without built in wideband and closed loop fuel managment. I couldn't imagine a carb being accurate enough for a turbo.

You could probably easier go with a Procharger with a blow through design, have less fab work and still make good hp with the intercooler. You're still talking $5K+ to do one though.

Fuel management is the keep to survival with forced induction.

A buddy of mine is building a TT 67' nova with a 383" in it. He is custom fabbing the kit with fuel injection, closed loop management etc. Its going to make about 700-800hp on pump gas. He will be spending in the neighborhood of $15k+ just in the motor/turbo/engine mgmt.

Sh*t ain't cheap, Hell I got $5k in that lil non intercooled turbo on my bike.

 

Hey thanks for the info and the heads up. Ever since i had my twin turbo Dodge Stealth ive been stuck with the turbo bug. I modified it with all forged internals, running 16lbs of boost and i just loved it. I don't have a whole lot of experience working on SBC's though. Especially turboing them. But hey- thats why im here- i get better info from you guys than most books probably. Thanks for all the replies.

 

check this out
http://www.2quicknovas.com/turbos.html

 

This is cool 2
http://www.bowmanmotorsports.com/

 

Those turbo systems were all the rage in the late 70's and early 80s until Magnasun came out with their siamesed blower that would fit under a hood. Those are sweet, no lag and that sweet blower sound.

 

Is it worth it in the long run to go with a 383 if im going to twin turbo it? Or would it be just as good to use a 350 with the twins? My cash is limited so i want the best bang for the buck. Is it worth the extra cash for the 383? Also does anyone make the headers and piping needed for the twin turbo setup, or would i have to fabricate it?

 

The 383 is good due to the fact it will make more TQ off boost but as far as peak HP with a turbo, size is kinda irrelavent. The turbo is making all the power, all the motor has to do is hold it.

I am sure you will have to fab everything. There are turbo kits for SBCs but I DOUBT they are designed around a C3 platform. Gonna be a lot of work and money but it would be worth it if you can get it to work. Turbos are awesome on the street! I would seriously look at the Procharger SBC blow through kit with front mount intercooler for a kit thats relatively easy to fab up and install. Then you just use regular headers. You are going to gain 150hp on top of whatever you are bolting it on. If a stock L48 makes 180rwhp, thats going to get you 330rwhp and into the 12s with relative ease and stock driveability. If your heart is set on turboing, you definetly want to build a good forged bottom end, O-ring the block and heads and use studs in everything. Don't run a cam with a lot of duration, actually a "blower" style cam would be a good choice for you. A flat hyd will be fine because you won't be spinning a turbo motor really high, 6000rpms max probably. You could probably do a single turbo much easier...Like a T76 would be a good size, good for 600+hp and relatively quick spool time considering the size. Just do some homework man....thats a BIG project.

 

BTW, here is how my "simple" lil turbo project started out.....:



Lets just say it was supposed to be "bolt on"..LOL
Projects like that have a mind of their own. I ended up rebuilding the motor/tranny in order to beef it up for the turbo. My kit was built/fabbed just for a hayabusa and STILL required lots of stuff to get it just right. 2 years later I am still tuning it. It has been on a dyno more times then I care to remember, I have installed an LM1 wideband O2 meter with 5 channels of datalogging and data log passes at the track on top end runs on the street. Seems like it never ends. It always makes good power but its nothing to have a 20-30hp swing any day of the week. HIGH MAINTENANCE is an under statement. I just want you to know what you are getting into. I have roasted 2 sets of pistons also and I can have the motor out of the bike in 2 hrs... Much harder in a vette. Turbos are not forgiving when it comes to compression/detonation/tuning so....study up bro..study up..

 

thanks for all the info guys. I am reading max boost book right now- just to get more understanding. This is going to be a fun project. I am studying mechanical engineering in school= what better way to get my hands wet than to design and fabricate a good system.

ajrothm: who sells that procharger kit you're referring to? Id like to take a look at it.

 

Procharger is built by ATI. Just google procharger.. Now Prochargers are centrifugal, belt driven super chargers, not turbos...FYI. They will still need fabbing for the brackets etc but it would still be easier then fabbing up a turbo system and it uses its own self contained oil, not engine oil so you don't have to recirculate heated oil back into the oil pan. MANY LS1s are making 550rwhp with an intercooled procharger on a STOCK motor.

Another option that I would NOT recommend but it might be worth looking into for simplicity is STS turbos. They do rear mounted turbo systems that use the stock headers and most of the stock exhaust system. There are a few of these on LS1s and they supposedly make good power but I would think boost lag would be horrible. I think its www.STSturbo.com.

It would take you countless hours to fab up/tig weld and bend your own plumbing for the exhaust but you know what they say, if you want it done right, do it yourself.

go to www.LS1tech.com and look in the forced induction tab, lots of FI stuff in there.

 

If your cash limited go with the 350 there aren't any affordable dish pistons for a 383. But it depends on the chamber size of the heads you get.

 

post lots of pics when you get started

 

You may want to take a look at Monty's page. Even though his '82 had FI instead of carburetors it is an impressive machine.

http://www.twinturbocorvettes.com/

BigBlockk

Later.....