call me carzy and stupid but i need ideas.

im going to set it up where the turbo is a blow-thru system. This way i hopefully can get a used turbo charger and retiofit it to my truck for fractions of the cost of buying a supercharger.

Im tired of having to tow in 4th gear and having no gutless motor when im towing.

i have thought about it and have read about it. A normal compression motor with stock cam can hold up fine to 15 pounds of boost. I want to run around 10 pounds. Chevy 350s are strong and my truck as a few miles on it but everything is top shape, no leaks and doesnt burn a lick of oil.

Im only looking to get around a 30-40% increase in power. Whats killing me right now is my mid range power which this will help a bit.


i got thi one:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33742&item=2438339244



Yes I will look into a intercooler but that is something ill get out of a junkyard.

Ill be running the turbo off one exhaust header and have where ill modify the pipe under the header and not the header it self. Exhaust pipe is cheep.

Also any information on blow-by system on a tbi would help out a lot. Right now im going off info on blow by systems on carbs and blow-thru tbi supercharger systems.

If the air going in to the motor is cool enough not to cause detionation, then there wont be a need for a new chip, and as long as i up the fuel presure and confuse the MAP sensor.

http://home.earthlink.net/~micfly/tuning_fuel.htm

bypas valves:
http://home.earthlink.net/~micfly/bypass_valves.htm

http://home.earthlink.net/~micfly/TBI_notes.htm

All my fuel needs with this thing:
http://www.kennebell.net/accessories/boostapump/boostapump.htm

also search pirate.com and found little.

So please help and shed some light on this.

You can buy used power stroke diesel intercoolers pretty cheap. That turbo looks like it is going to be too big for what you want. Will probably be laggy as hell. Look at the way the grand nationals use one turbo for you manifold setup. Good luck.

run both exhaust manifolds....if yer gonna do it, do it right.....you have WAY too big of a turbo for a SBC.....look into a t-3/t-4 hybrid or sumthin....and your gonna have to get a chip burned....the ECM wont know what to do with all that air....plus injectors.....etc.etc.... you need to run the turbo as close to the heads as possible in order to use the velocity needed to spool a turbo up....having it so far down the exhaust will not allow it to create boost correctly....might need smaller headers (primaries) in order to create enough velocity too.... even if you dont raise the IAT, (which you will by at least 100-200 degrees) the extra pressure put into the cylinders will create knocking or pinging.....welcome to the world of supreme unleaded fuel only too...sucks paying top dollar everywhere you go fer gas......just my .02

does anyone know the RPMs which would be required on this turbo to get 10 pounds of boost?

Depending on the turbocharger but its safe to say it'd be around 4-5K RPM for a 350 or so with a modest turbo setup.

Turbos are -NOT- a good idea for 99% of motors that spend their time offroad. Turbochargers need to be spun fast to do much. The smaller the turbo typically the sooner the boost comes on. In short, dont touch turbochargers. Unless your motor spends most its time near the redline its a waste of your time. Turbos also produce -ALOT- of heat. For motors that arent in vehicles going very fast this is bad.

If your worried about power at a wider range of RPMs then screw turbos. There are three options here. You can

1. get a bigger crank for more stroke and thusly more torque.

2. Go with NOS and put enormous stress on your motor while it doesnt have the ability to properly cool itself.

-or-

3. Go with a supercharger. Its an easier setup to dial in and keep working. It generates significantly less heat than any other option. Produces alot of usable torque from about 1500 to redline and is an excellent excuse to get a totally wicked looking shaker hood.


Now whats most important here isnt the power your getting from option three. :D Its actually the shaker hood. Shaker hoods are so fucking cool that any excuse good or not to have one on your rig should be used.


Remember kids, dont do drugs. Do shaker hoods and ladder bars.

well im thinking on converting the compressor of the Turbo in to a supercharger now. This is why i need to know how much RPM's the TURBO runs at to have 10 pounds of boost.

for surfing the net i found the similar compressor on a supercharger turns at max around 40,000 rpms. This would be around a 9:1 overdrive from the motor. I think i can achive this just by a small pully on the supercharger.

http://www.superchargersonline.com/content.asp?ID=19

This guy does what you want to do. I have talked with him before. He has even done with with AMC blocks, that is how he got my intrest. Give him a call he will know how to set your system up:


http://www.gatorsuperchargers.com/

-RJ

I emailed him and waitng for reply. Do you know by chance where and what bearings he used?

http://www.gatorsuperchargers.com/gator%20opening.JPG

What bearings and pulley do you think these are? Where could i get these?

I'll buy that turbo off of ya

you will have to spin that thing atleast, atleast 90,000 rpm to make around 10 lbs boost 40k might get you 5-6ish which is about as fast as a sbc will spin that huge sucker. you really need a t-04 or t-05

Originally posted by K-Rigg

Im tired of having to tow in 4th gear and having no gutless motor when im towing.

Can you say BIG BLOCK :D

10lbs will give you an effective CR around 14:1. Safe for pump gas is usually 6-8lbs.

check this (http://www.holley.com/HiOctn/TechServ/TechInfo/SCTech.html) out. Scroll down about half way.


Charlo

yea i figured that out about 10 minutes ago that i was shooting too high of boost. Thanks for the site.

I am currently working on a setup with twin t3's for a small block chevy. I have some experience with these setups, and don't think that you would want to run any more than 5-7 lbs. of boost. If you run that turbo, you need to run both sides of the motor into it. It will be okay if you keep the distance between the heads and the turbo as short as possible. It is best to keep them equal length too. It would definately produce plenty of boost too! That puppy should give enough power for a 800 horsepower motor!!! As far as running the compressor into a drive pulley, the centrifugal superchargers have a gear box that lets the compressors spool those high of rpms. Without a gear box, you would need a huge pulley on the crank and a tiny pulley on the supercharger. I would definately spend the money on a propper supercharger if I were you. It is all around the best kind of power for what you are looking for. Just my input.

Twin T-3's off a thunderbird turbo coupe, or SVO mustang is the way to go. Alot of mustang guys are getting close to 500rwhp, and even more torque with otherwise basicly stock motors. Twin T-3's will are normaly making 10PSI around 2500rpms, on a 302.

check out www.toohighpsi.com for more info.

got it today, this thing is huge! I'm glad I'm going to be using it as a supercharger. I'm guessing around 30,000 rpm on the turbo will give me around 6 lbs.

http://www.texasoffroad.net/albums/lonestar/album92/IMG_0413.jpg
http://www.texasoffroad.net/albums/lonestar/album92/IMG_0414.jpg

Id say for a stock internals sbc no more tahn 5 lbs boost. that cummins you have wouldnt even kick in till around 5k rpm or so. Id go t4 single, or twin t3's, and stay tbi. and definitely merge the headers before the turbo, dont go through just one header. would create a terrible imbalance. sorryif thats not what you meant. good luck, dont blow up yer engine. get a boost gauge a grainger valve, and maybe a book on turbocharging.

i have decided to turn this into a Belt driven super charger like the picture above shows. I'm just wondering if anyone can tell me at what rpm the Compressor has to turn to get 5lbs of boost?

Well at least you get the cahones grande award :flipoff2:
Thats the biggest freaking turbo i have ever seen. Good excuse for a cowl or even NO hood. If you put some dished pistons on her you can probably get away with up to 12lbs on pump gas. That would get ya moving good but then you may need an intercooler.

Charlo

it is big, i just hope i can get it in under my hood but i got a plan. I still need to know what rpm to turn this thing to get 5 pounds of boost so i can set up the right size pullies.

I dont know if youll be able to get enough rpm out of that turbo to create boost. what size pulleys you gonna use?

Originally posted by W.O.T.
I dont know if youll be able to get enough rpm out of that turbo to create boost. what size pulleys you gonna use?

I dont know yet, thats why i need to know what rpm the turbo needs to spin so i can get the right size pullies.

Forget that thing. It is for an 855 cummins and you are way below it's cfm rating for efficiancy. You need to go out and buy the book Turbochargers by Hugh Maclnnes and read it cover to cover and understand it before you try to design your own turbo systems from scracth.
You need about 40K rpm before a centrifical compressor beggins to build any boost. That is going to be a pully ratio of a minimum of 14 to 1. You would need a two belt system at least and normal belts aren't going to go around a pully turning 40k.
You are trying to reinvent the wheel. There are lots of kits and knowledge already out there about turboing small block chevys. You could probably buy a used kit pretty easy. You will be way better off in the long run than trying to design your own.

Originally posted by Oil burni'n
Forget that thing. It is for an 855 cummins and you are way below it's cfm rating for efficiancy. You need to go out and buy the book Turbochargers by Hugh Maclnnes and read it cover to cover and understand it before you try to design your own turbo systems from scracth.
You need about 40K rpm before a centrifical compressor beggins to build any boost. That is going to be a pully ratio of a minimum of 14 to 1. You would need a two belt system at least and normal belts aren't going to go around a pully turning 40k.
You are trying to reinvent the wheel. There are lots of kits and knowledge already out there about turboing small block chevys. You could probably buy a used kit pretty easy. You will be way better off in the long run than trying to design your own.
dude I totally agree. no way in hell any belts are going to stand that kind of torque/rpm. I have also heard great things about Corky Bell's book. Its at amazon.com and on ebay. turbo theory, equations, application guides, typical setups, carb, efi, etc. if your trying to homebrew a turbo system its definitely worth every penny you spend. ITS NOT AS SIMPLE AS YOU THINK!!! If I had the cash and tools to turbo a V8 Id do twin t3's, carbed blow through or standalone, ~10psi. easily 700hp. search on google or something. lots of great sites about people turboing mustangs and such. that cummins would be sick on a drag motor but its a definite dont for your stock 350. now dont get me wrong Im no turbo expert, but that turbo or your supercharger idea isnt goin to happen.

I know it sounds stupid and seems that it wouldnt work, but im bored and need power and no money so ill try it.

Im thinking my best bet would be a secondary pulley for the supercharger. Where and on what could i find that could find a big pulley (to go on the crank pully) and a matching small pulley(supercharger).

Also where can i find these bearing assemblies.
http://www.gatorsuperchargers.com/gator%20opening.JPG

Ok i found out the bearings are called: Common steel SKF bearings.

With i quick search on google i didnt find any place that had anything similar to the ones in the pict.

Does anyone know where i can get these?

FWIW... there was a few guys at the clubs mud bog this year running a buggy with a junk yard twin turbo, on a junk yard 305.

They used blow thru setup, and it seemed to run pretty damn good, for what it was(all junk yard parts)

I would assume it should take 8-10 psi stock..

Originally posted by K-Rigg
Ok i found out the bearings are called: Common steel SKF bearings.

With i quick search on google i didnt find any place that had anything similar to the ones in the pict.

Does anyone know where i can get these?

Dude you are never going to make a thing with slow turning greased flanged bearings and a industrial pulley with a set screw turn 40 to 80K rpm. Do you have any idea how carefully turbos are balanced?:rolleyes:

at full boost most turbos are spinning 100,000 -150,000 rpm how do you plan on getting the thing spinning that fast with a belt?

just out of curiousity how much rpms are sperchargers turning? both roots and vortech style?

Originally posted by W.O.T.
just out of curiousity how much rpms are sperchargers turning? both roots and vortech style?

roots, normaly not much more than engine rpm, sometimes less

cetrifigul, usualy under 20K