This is my first build, I have a z6 commin back from the shop soon. I went with the 75.5 vitaras, acls, eagle rods, arp studs, oem h gasket yadaya. Will im breakin the motor in ill be lookin for advice on the best turbo for my motor. I am shootin for 400 hp to start. Any advice would be sweet on where to take my build from here. Thanks

 

I will also be runnin 440 injectors, 255 walbro, oem oilpump, gsr throttlebody, goldeneagle fuel rail, blox camshaft and gears, im lookin for the whole turbo kit. I want the kit ready to go as soon as the break in is over. In the mean time ill be puttin on the skunk2 pro c coilovers, control arms etc.

 

you need bigger injectors for the amount of power you are asking . Look into doing a 30r or precsion 6262

 

http://www.rceng.com/technical.aspx#Conversion_Formulas

Scroll to the very bottom of that page, your gonna need at least 650s if you want to run at 80% duty cycle. So up to you. good luck with the build.

 

6262? That's BIG for a D.

5857 is comparable to the 30 and will do 4.

Everything else everyone said is dead on, injectors are way too small.

 

Cool, so bigger injectors, no problem that skunk set up a decent kit anyinfo on silkroad heard they are goods too. Now with that setup injectors and the 5857 how much booste should i shoot for 12 to 15?

 

Haha.

Well actually, 100+ octane and 25psi+ is a good start for 400s on a D.

 

You do not go to the dyno with a psi goal you go with a horsepower goal. I mean you could go with 15 psi being your most but you might get 400 at 20psi or 15psi you don't really know. You could have a small turbo and put 25 psi but if you have a larger turbo and put 25psi in to it you'll make way more power psi really has nothing to do with how much a motor can hold it is the horse power they put out.

 

^ If you have a turbo and an engine in mind, you can go in with a pretty good idea of what kind of PSI you will need to push to reach your horsepower goals. It is by no means an exact science, but most of the time you can go in with a pretty accurate idea of what it's going to take to get what you want out of the engine.

In this case, a 5857 or 30R sized turbo is going to probably need in the 25psi range to crack that 400hp range. May be a little less or a little more, but it can be more or less completely guaranteed that he's not making 400 on those turbo's with 10-15psi.

 

Okay got it. Sorry bad chioce of words makes sence all the advice on psi. Thanks guys now i have a better understanding on the subject. Man i know gettin into the that there are tons of variables but the scope is a lil clearer now. Still learning. Thanks again guys!

 

6262 would work fine on a d

 

Okay 6262? Well sorry that i didnt mention that this is a street car, that is dd. I think thats way to big for my needs. Im gettin hella impatient bc my car has been at the shop gettin the lowerend built, but they are a pretty popular shop soooo.... Anyway i got an i on a turbo set up that i want. Gettin ready to pick up a ram horm from speedfactory t-town