4.8 Turbo Sizing

[casey23]

Ok...I'm ready......

I have been rolling it around in my head for a few wekks now and have kinda thought of a STS Type of system that I would like to build myself...I would like to mount a turbo about 1-1.5 feet after the "Y-Pipe". I have a consederable amount of experience in fabrication and welding and belive that this wouldn't be that big of a deal. I would like to have some input on this and would like to know about the size of turbo I would need for this...for about 8-10lbs of boost. Also I have no other engine modifications or ECM Mods. I know that I will at least need a reflash and bigger injectors. I have searched what seems to be all of the web and have come up with nothing but a bunch of forums on ricers... and dead ends I need some help...

62-1 is a great start.. even a MP70 with a .68 hotsite would work Great.. I have a Big turbo out back and dont think i will ever put it back under the hood... I had a 70mm .96 under the hood and it was Ok....... With my new combo i was not happy with the mounting of the turbo Anyplace under the Hood So in a last ditch idea i put it under the truck just behind the passanger.. Nothing is Cheap about FI... bottom dollar 2500+ if you dont skip steps and I would also make sure you leave a little in budget for Guages... Boost and Wideband if nothing else.... Injectors and possibly fuel pump will also need upgrades........ everyone has Flocked to Front mounts but I have chose to be different and look at all options before you start spending....

[ducky]

Oh ok thanks r.barn

[r.barn]

Oh ok thanks r.barn

If your really interested in learning whats going on in a turbo
system I highly recommend the following book.

Amazon.com: Maximum Boost: Designing, Testing, and Installing Turbocharger Systems (Engineering and Performance): Corky Bell: Books

[George C]

rearmounts do work but i wouldnt do one for a true daily driver. the location of air filter is horrible, one thing i like is stealthy

[Mr.Cornelius]

Ok as for the oiling system I was thinking of a system where NONE of the engine oil runs throught the turbo...but on its own oiling system with an electric pump and cooler....

may I ask why rear mount turbos are so bad??? I though alot of you ran them. Its not that I'm trying to be cheap, but I would like to spend a lil here a lil there untill it is done....than install the system on my truck.
I know rear mount turbos cant be THAT bad or STS would have been outa buisness along time ago. I know theres a lot of pros and cons to BOTH systems

thanks for the sizes this will kinda give me an idea on how to do this...

Thanks for the head up on that book...I'll have to order it after christmas...

BTW I'm not trying to open a can-o-worms...I'm just trying build my first turbo system and maybe learn a little bit in the process. I kinda need a lil guidance...lol

[Sleaper]

It's more just personal preference. Rear mounts work fine and are still capable of making a lot of power. The main argument will be lag and efficiency between front mount and rear. Front mount, as r.barn said, will get the hotter gas since it's close to the engine and therefore SHOULD reduce lag. Plus, rear mounts have the air filter under the truck instead of in the engine bay. Having a turbo in the engine bay also generates a lot of heat under the hood which can be fixed with a turbo blanket.

In rear mount applications, you can help keep exhaust hot by wrapping the pipes all the way back to the turbo and put a turbo blanket on.

Like you said, there are a million reasons to go with one over the other and ultimately it comes down to which one you want.

[casey23]

HEY R.BARN........... Alot of us have Cool pics of things we have built in the past ... I am a Die Hard Supercharger Guy myself... And allways made fun of Guys who try and run with us with turbos !!! I have a few Garage shots myself... and My complete motors Dont fit on Girly Engine stands.....

[casey23]

Ok as for the oiling system I was thinking of a system where NONE of the engine oil runs throught the turbo...but on its own oiling system with an electric pump and cooler....

may I ask why rear mount turbos are so bad??? I though alot of you ran them. Its not that I'm trying to be cheap, but I would like to spend a lil here a lil there untill it is done....than install the system on my truck.
I know rear mount turbos cant be THAT bad or STS would have been outa buisness along time ago. I know theres a lot of pros and cons to BOTH systems

thanks for the sizes this will kinda give me an idea on how to do this...

Thanks for the head up on that book...I'll have to order it after christmas...

BTW I'm not trying to open a can-o-worms...I'm just trying build my first turbo system and maybe learn a little bit in the process. I kinda need a lil guidance...lol

Dont let R.BARN change your mind on anything...... Use the engine oil for the turbo... Rear mounts do have alot of parts.... My own truck has 16 Clamps that are 2-3 different sizes... about 8-10 couplings... You can nickle a dime a kit together in a few weeks for a good price under 2000.00 bucks.. the part that will hurt you will be the Tune ( 400-500) and Injectors 250-350.00 the turbo parts depending on how exotic you get with turbo,wastegate and BOV 600-1200.00?? if you get in any trouble feel free to contact me for a little tech support or links on getting good prices for the best parts........

[Mr.Cornelius]

Dont let R.BARN change your mind on anything...... Use the engine oil for the turbo... Rear mounts do have alot of parts.... My own truck has 16 Clamps that are 2-3 different sizes... about 8-10 couplings... You can nickle a dime a kit together in a few weeks for a good price under 2000.00 bucks.. the part that will hurt you will be the Tune ( 400-500) and Injectors 250-350.00 the turbo parts depending on how exotic you get with turbo,wastegate and BOV 600-1200.00?? if you get in any trouble feel free to contact me for a little tech support or links on getting good prices for the best parts........

I don't plan on going too exotic, I just want a good match and a good lasting product for my application... I am allowing myself untill June to get this done. This should give me the propper amount of time an money

[r.barn]

I know rear mount turbos cant be THAT bad or STS would have been outa buisness along time ago.

STS should be out of business for all the crap I've seen about their kits.
My tuner was a dealer for them, and after almost getting sued the 2nd time,
dropped the line and designed their own kit.
Every time I've seen one being installed I was thoroughly unimpressed with
materials used, routing and design. ..... just say'n

If the truck guys are having good luck with em, then I'm knock'n on wood for you.

Anyway, back to topic. A 60-70 mm turbo is good size for a 5.0L motor.




and right back at you Casey