anyone running a decent size turbo like a t-78 on a stock port engine? is lag just terible with the stock ports??
what kind of power are u seeing at 15-16psi? and 20plus psi on race gas?

 

i did a stock port engine with a greedy t78.
16psi @ 4500 rpm, but i'm at 4k elevation. it made like 408 whp on a really conservative tune.

 

im running a master power t70. its a little bigger mm inlet then the t78. its laggy... but i can live with it.

I would like a .84 hot side tho. im running a 1.0 now and it adds to the lag.

 

AF61 61mm cold side 1.0 AR

 

you call that big?

 

spacerat (jared) is running a t4/61

-GT35R 61mm compressor wheel
-0.70AR T04S compressor housing
- Flow Rate 65lb/min
.96 AR turbine housing

he dynoed at 401 on race gas (20 psi). he ran a 12.012 with radials and 12.5 is his best with street tires i believe (on race gas). he also uses alcohol injection and a nice vmount

as soon as i find a haltech im going to be running a T4/67 with a .96 housing. which is a 75 lb/min turbo and im hoping for 450-500 with meth injection and a npr intercooler.

this is all on stock ports btw

 

and my understand is that the turbo lag is really not all that bad compared to his hybrid he was running before. i also heard he gets 20 mpg around town . i dunno how true that one is but its cool.

but what you need to remember is that porting does not open up the ports (more flow) as much as it changes the "cam profile" of the engine.

 

turboX2 is the man with the setup on stock port

 

Yeah I consider something that will carry a car to almost 500rwhp big Especially when a high hp 7 is in the high to low 600's

 

i agree with that one

 

Just finished building the REW here are a couple of pics for reference.

HAHA just messin' with you

 

I will be running A-Spec's 500R on stockports. I plan on running around 15lb of boost until I get my motor built up, then I will be able to run higher boost.
I won't have huge horsepower, but should have a fun weekend car.

 

same here

 

lol...thanks keith...I made about 419rwhp/ 345 tq @ 15psi on stock ports with me t-78...I see full boost by 4k or so and I am still making about 400 rwhp at 8k...

 

500 on stock ports? im going to assume not.

my 69.11mm t70 can make well over 500 no problem at just over 20psi.... just not on stock ports. No one else is running this turbo on stock ports and when i go dyno it will be a good base line.

i wish i woulda got a smaller hot side tho.

 

def keep us posted on those 500r's on stock ports.

 

thats pretty good!

 

Thats awesome..400rwhp @ 8k rpms..just one hard "kick in the pants", as some say.

 

I am shooting for 500rwhp on stock s4 ports/built motor with my pt67 pump 93, alky injection and high 500's with 110 race gas.

 

I have seen a dyno vid of KaoticFDR1's car with a AF61 hit ~455 @ 22psi and 5.5k. He had horrible ignition break-up. Plus I said right below 500

There was also a sheet with a AF61 that put down ~415 at 16psi.

Z