Longevity is one of the issues here because the car is for street use. I have a 1972 911 T. I'm the owner since 7 years and the car is daily driven. I use the car the 7 days of week. Is a great car. The longevity is the element that make this car to live all the time. I want the same for the 3.0. Maybe not to much like the 911T, but closer to it.

I was thinking (or is a good idea) to change the CIS to 3.4 liter air intake system or use TWM individual throttle bodies (like the webers 3C) and make the air delivery system, or simply keep the CIS and add a suplementary fuel injection.

Let me know some opinions. I'm a carburetor guy. I did not know too much about fuel injection.

Vic, what boost were they running in these engines that experienced reduced life?
There are at least 6 people on this board running turbochargers on 3 liter engines and stock pistons, one of them was converted in 1982 and has run reliably ever since. That is what I would consider reliable.
My own engine, a 9.3-1 CR, ran for almost a year under boost before I took it apart and inspected it for unrelated reasons. I found absolutely no damage whatsoever and I know what to look for. If life expectancy was going to be reduced I would see at least sone evidence of it after that period of time. Now if someone blew up an engine it could be attributed to many things, some completely unrelated to the actual boost. Maybe they ran too lean or whatever.

I agree that you can't run 1 bar with 9.3 to 1 compression pistons using pump gas on a stock 3 liter and maintain full reliability without changing many parts, but running .5 bar can be done reliably and has been done. Many times. It is documented.

BTW, just for fun, does anyone want to post the compression ratio of a new Porsche turbo engine?

sammy

The guys and Cars I meant are racing Cars. Down here the heat is a Killer:mad: Maybe Nitrometano Know some of this Cars..!

This is a 3.2 F. F. Injected
http://forums.pelicanparts.com/uploa...1116348117.jpg

How do you like thsi 3 rotos Mazda
http://forums.pelicanparts.com/uploa...1116348257.jpg

http://forums.pelicanparts.com/uploa...1116348380.jpg

http://forums.pelicanparts.com/uploa...1116348395.jpg

Cordially

Vic

I saw some of that cars on TV. The pictures are taken in Salinas Speedway.

Hey nitro Do you have a shop in PR or an Internet site for Mecanica Herodes?

Vic SmileWavy

Not like that. Mecanica Herodes is society that one friend and I we have. We repair cars, a/c systems, boats, or whatever. To make some money to pay the studies. May be in a future we make a auto repair shop. The name comes alive one day (like 4 years ago) that we have replacing the brakes from a Toyota Corolla. The present project is making a Geo Prizm turbocharger. The only thing that we have not already install is the intercooler because we need to cut the bumper to fix it. That because the intercooler was taken from a Mack Truck. There was so big (4ft long) that we make 4 intercoolers of 8 lines each from the original. We sold the rest of the intercoolers. That is the history.

Hey Nitro

Are you a Mayor in Mechanical Engener. An Intercooler from a Mack..? That's big Stuff

Vic SmileWavy

We buy the Mack intercooler for $100. It looks like new. The pieces that me make we sold it at $125 each. So we gain $375 for that intercooler. In other words, the intercooler that we will use cost us $0. Because we recover the money that spend on it. My skills are BA in Social Sciences and 2 years in the law school. My friend skills are 3 year of civil engineer from the UPR Mayaguez Campus, auto technician, a/c technician, fuel injection technician, computer technician and at the present he is study diesel mechanic. All from Automeca. My mechanic skills are learned from the street, in the drag racing sport, other mechanic friends, books, internet, forums, magazines, experience, etc, etc, etc. I'm planning to finish the law school and then study auto techincian to take the licence.

SmileWavy

i bet i have the most miles!

Hey Nick, what size of turbocharger do you have?

i have a rebuilt Rajay .50

Nick - got your PM. Msg'd you back...

I have not found yet a 7.5.1 aftermarket pistons for the SC. I'm thinking to make the wrist pin bushing modification that consist (in my case)moving the center of the bushing to the side of the rod bearings. This will reduce the compresion and with that I, can use the stock pistons with a lower compression ratio.

don't a few 930 guys bump there CR up to have better drivability?

I think a common mod is to use SC cams to increase low-end off-boost torque.