As you know i have a stock L98 350 TPI. I am wanting to make a rear mount turbo setup. I found this turbo and im wondering if its to big or to small thanks for you help/input. Here are the specs.

Used T-70 turbo with a .96 AR T4 flange large fram with a buit swither blade. I made 600hp @ 35psi on my 4cyl motor. The turbo is in very good condition. Does not smoke , no shake in the shaft.

Here is a pic

 

T70 would be perfect many LT1 and LS1 guys run Masterpower MPt70s.

Jay

 

What all would i have to do to the motor itself to be able to run this turbo. injectors, chip, TB, maf, etc...?

 

There is no such thing as a turbo that is too big. You have to look at it as the motor is too small.

Phil

 

Ok well IS the motor to small? i plan on putting some dart pro 1 heads on it someday maybe even just get the corvette aluminum ones and porting them.


* i also don't wanna push more than maybe 8lbs of boost. All im really looking for is a little gain from a turbo and mostly the sound from one. maybe build the motor up and run more boost along way into the future. *

** i really wanna run the turbo at 5 lbs for street use **

 

I wasn't talking about your motor. Sorry for the joke.

Phil

 

No i get the joke. lol But i was meaning is my motor to small. Will it handle that much boost? and do i need bigger fuel injectors and programming?

 

If we were talking about a diesel I could answer you questions. I have no clue about a turbo on a gas motor.

Phil

 

Oh well i guess it'll work so ill hopefully get a turbo system done and working before the end of this summer.

 

Don't waste your time.

 

Why would it be a waste of my time???????i have done the reading and everything it says is true and it is what im doing to the car. Its cheaper, cooler, and is easier to install.........

 

Links to said reading? I would be interested in them.

I am not saying it doesn't work. It works. It just works poorly compared to a system mounted in the engine bay and there are a lot of cons to the STS setup.

I just wouldn't waste my time with it for the results you are going to see. That is all I am saying. All of the STS turbo cars I have ran across in real life have been pretty slow for being turbocharged (all LS1's).

 

I didnt wanna do it either but i seen hawks third gen's fourth gen ls1 with single rear mount turbo and that thing was bad as hell. That is why i wanted to do one. The sound coming from right out of the turbo was like a freaking jet. So that is why i wanna do it. If i lose boost i don't really care i wanna have the sound mostly and still be able to make even a little power from it.

 

If you're doing it for the sound then save yourself the trouble and buy this.
http://www.sunamiturbo.com/sunamiturbo.html

And for the little extra power part, buy 3.73 gears, exhaust, free mods, CAI.



I just think that 5K could towards something else other then an STS kit for your car. That's just me though.

 

No No NO NO i'm not buing the sts kit. I am buing a turbo and doing eveything myself except for the intake tubing. It will cost well under $750. If even that. The turbo will cost the most...
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Also i already have a Flowmaster cat back and a CAI...

 

head over to http://www.theturboforums.com/smf/index.php

and read away.

 

Thanks for the link.

 

Now i have a turbo i can get. It has a intake a/r of .96 and a exhaust a/r of 1.00!!!!!!!!! Now i think that will have alot of lag? am i right?

 

On a stock L98 you'll be lucky to spool that by 3800rpms on a rear mount (with a fully wrapped exhaust). Don't buy a turbo because it's cheap, buy one because it's good quality and well suited to your application.

 

That turbo will be fairly well matched if you go with a normal single turbo header mount setup. Either buy the BBS designs or you cant buy a single turbo stainless setup from ebay. The BBS setup is amazing but requires more fab work. The ebay single turbo stainless setup "mostly" fits but requires a little tweaking. Ebay set costs about 300 and comes with both headers and the lower crossover pipe. As a normal setup the t70 will kick ***. As a rear mount...spool with suck...like to the point where it is almost pointless. My advice is to nab that turbo, and slowly build the rest of your setup

 

i would like to do an underhood one but i have no room at all to place one under the hood.

 

Hopefully you are picking the turbo up super cheap under $500 as thats all its worth. That turbo will spool fine on your car and make a good amount of power if its a real 70mm. As with any used turbo, i always send them out to have them dissassembled and inspected.

 

well i traded two car audio amps that i didnt need. So roughly 150$ worth? It passes all the tests that they says to do.

 

which tests and who is "they"?

 

Testing for acceptable shaft play and obvious damage to the compressor and exhaust wheel is about all you can check visually. You will not know if the seals are bad until you install it on the car and run it.

The fuel system on your car will need to be upgraded depending on how much power you plan on making. Depending on what injectors are currently in the car, they will usually need to be upgraded to larger injectors dependent on power level. I also suggest a rising rate fuel pressure regulator as well to help add more fuel when the motor is in boost. These are good starting points in upgrading the fuel system but all will have to be planned out after you decide how much power you wish to make.

 

well sts told me all that. An power wise just whatever is safe on my motor with 5 pounds of boost. From what sts says, I dont have to upgrade any of that runnig that low of boost.

 

If you want to lean out the motor and fry it then dont upgrade anything. Even 5 lbs needs more fuel. If you add more air you need more fuel not matter how you do it and with a turbo that compresses air you will need a lot more fuel. Larger injectors, bigger fuel pump, fmu, and proper tuning even at 5 lbs or it will bust a piston in no time and the only noise it will make after that is knocka knocka knocka.

 

I plan on doing all that when i do this setup.

 

How long do you honestly believe you'll be running that low of boost for....?

 

well ill be running "that low of boost" till i pull the motor and build it to hndle it.

 

And youll pull it to build it because you decided you wanted to see what 10 would do ... then 15 ... lmao.

I want to Rear Mount TT my pickup so bad !

 

"Build it to handle it", ehh lol? Lemme tell you something, even the strongest engine builds succumb to broken engine parts, it's all about understanding detonation, and how to avoid it. My buddy Paul, literally, has close to one hundred passes on his cast 3.8 Buick, and that's at 20+psi, running low to mid tens, consistently. You can waste your time and money building up your engine, and then when it blows to pieces, you can waste even more money building it up all over again. If forged internals, which assist in false knock readings, makes you feel secure, then by all means, go for it....