Is this drop off because of the infamous ATP turbine housing design that some people have given poor grades to?

 

damn good numbers for atp kit.
who said atp kit couldn't make power?
what kind of manifold?

 

No one said it can't make power, they just can't make the big power that other tuners get out of the same turbos

 

well he did mod the ATP kit and has a different O2 housing...

 

Yes, basically had to create a new downpipe to fit the way it should have in the first place (big to ATP on that one) It's quite possible that the housing ATP uses is limiting some airflow up top. We actually backed off the topend a little bit because the factory ignition was breaking up pretty badly. I may eye an ignition upgrade and take it back to the dyno to find out, but unsure at this point. I assure you when you're inside the car and driving it you dont notice the little drop off from 7000-7500rpm. It makes those who ride in it erupt with laughter like they were on a roller coaster ride. Oh, the mods are on the first page for those that missed what this or that was. Holla

 

This is all on the stock block? How long do you expect the block to last? See if I did this to my STi...no telling when it would blow lol.

 

it's like a Toyota......it lastsssss foreveRRRRRRRR...........

 

Welcome to the huge difference between the EJ25 and 4G63t...he's not even to the limits of the stock block yet.

 

525wheel is about the max that Garret claims "per their website" Which would put it around a 650 (crank HP) turbo.

 

I expect it to last for a long time. LOL, there is another reason not to own an STI Im kiddng, different strokes for different folks.

 

Sorry man but when they spec a turbo they don't spec it for WHP, they spec it for air flow becuase they have no idea what it is going on, the biggest GT3076 flows 60lb's of air which is only 600hp not 600whp. Can 600whp be done on it yes but to get 65lb's of air in a GT30 you have to use the GT3040 not a GT3076 to get a real claimed 650hp producing. Otherwise the GT3076 that ATP sells is the normal 52lb wheel design. 520hp. Just tryinig to help you out becuase nobody makes a GT3076 that flows 65lb's of air but they do a GT3040.

 

No.

The estimated power potential posted by Garrett and other turbo suppliers is bhp (crank), not whp. The turbo suppliers calculate this number based upon the choke flow limit of the turbo. When Garrett says, "Ideal for medium displacement engines making up to 525hp" (GT3076R), that means up to 525 crank hp. Turbo suppliers have no way of knowing the drivetrain losses of the vehicle it's going into, and don't pretend to guess for obvious reasons.

And where drivetrain losses are concerned, the greater the power at the wheels, the smaller the drivetrain losses, so assigning an arbitrary percentage doesn't work. Even so, the drivetrain losses of an EVO are hardly a whopping ~24%.

 

^^^What he said is correct. As far as how much BHP a turbo is capable of producing, ask the builder how many lbs/min its claimed to flow..this is GENERALLY a rough figure as to how much bhp its capable of producing.

I.e. A FP3065/GT35R is rated at a 65lb/min turbo which is capable of roughly 650crank hp. A FP3052 is rated at 52lbs/min = roughly 520bhp.

 

The FP3065 = GT3040 (-14) not at GT35R. Easy to confuse though.

 

Damn...looks like it's about time for me to make the switch. Looks like I got some reading to do...before I start, can someone tell me what the stock block is capable of running? Nice #'s btw.

EDIT: Nvm...found what I needed.