big 16g turbo vs. 20g turbo help please

[mike000g]

Can someone help me pick out of a big 16g turbo or 20g turbo?all i'm trying to do is hit 400hp
with out changing my internals.so far these are my mods greddy fmic with piping,550cc injectors,walbro 255 fp,manuel boost control,greddy catback,as well as apexi safc not installed ### of no upgrade on turbo.i have recieved so many opinions on both.i heard that the 20g can kill my internals.and that the big 16g turbo is a ported evo turbo.i'm leaning more on the 20g but i wanna see what u guys think. the reason i picked these ### the are direct bolt ons.

 

[greengoblin]

The turbo is not going to kill your engine it's the tuning or lack of or if it's old and ready to die or just not up to handling 400hp. You are going to need a 20g at least to make your goal of 400 hp and that depends on if your talking about running race fuel or your talking pump gas. Also your injector aren't going to cut it either and you need a FPR if you have a 255lph FP. Making 400 hp is not as easy as people make it sound. That really is a lot of HP. So are you talking 400 hp on pump or race fuel?

 

[brute]

You'll never get 400 hp out of an Evo III 16g without internals.

 

[MyBeatGSX]

Since those are the only options you gave, you need the 20G, its that simple. There are far better turbos for significantly less than the price of a 20G however, but you don't seem to want any of those.

400hp is pushing it on stock internals, yes it can and has been done, but how long it lasts will depend on how good your maintance and treatment of the car are. To the VR-4 guy, how is 400hp on an Evo III any more stressful than 400hp on a 20G... 400hp requires the same cylinder pressure regardless of how the cylinder is getting pressurized. They both have undersized exhaust housings for 400hp so both will require excessive boost.

You also need to look at the rest of your setup...

550's... not gona cut it, get some 650's or 750's
SAFC... not gona cut it, get DSMlink or EManage or something
You need a AFPR, a downpipe, etc etc etc. But more than anything else, 400hp requires lots of tuning. So factor in alot of money for dyno time.

 

[Baton]

I dont think Brute was referring to the stress the 16g would have on internals. the EvoIII 16g is rated upwards of 380hp. He was saying that it's hard to get 400hp out of that Turbo unless you have a tremendous amount of supporting mods including internals ect.

 

[brute]

At a certain psi, the compressor wheel is spinning so fast that it begins to produce more heat than boost. It can actually begin to be a detriment to the system. This is where the turbo enters the "choke" area on a compressor map. It's the flow limit of the turbocharger. So, say 30 pounds on an Evo III 16g will not be the same as 30 pounds on a GT3071R. See what I'm saying?

 

[slipstream808]

400hp is not 400hp on different turbos. The lower you make that 400hp, the higher the torque you must make, and therefore the more cylinder pressure the engine will see. But with the 20g and 16g... not too much of a difference. The difference is up top.

Go with the 20g as it breathes better up top. It'll be a bit easier on the turbo and a teeny bit easier on the engine. Easier to do on pump gas, too. You'll be pushing that 16g pretty darn hard to hit that HP.

Heck, with some craaazy boost control -read electronic boost controller with RPM dependent tuning- and wicked good tuning skills -DSMLink or better-, you could make a flat torque curve!! (gasp, eek)

 

[L2RTSiAWD]

Please search and do your own research. This is a common question.

http://www.dsmtuners.com/forums/search.php?searchid=2042180