I have a stock bore gsr block, srp 9.5:1 pistons, eagle rods, stock b16 head with RLZ valvesprings/retainers, skunk2 pro1 cams, precision 750, omni 70mm tb, edelbrock victor x, id1000, and currently a precision 6776HPS .68t4 with a damaged exhaust wheel from dropping a valve last year. it made 618whp@24psi on q16, but want to get a turbo in better shape and better for a "street" car. switching to e85, and would like something quicker spooling but want to make the same power. i know the 65 has a bigger wheel, which should be better for the cams im running but was wondering if it would make much of a spool time difference. i am also running a forward mount close to equal length manifold that i made myself. any help would be greatly appreciated so i can get a new turbo asap, or any other turbo that would do what i want at a reasonable price would be appreciated also

 

6262! I have a very similar setup to yours and on the corn it made 650@25psi. If going ethy, upgrade all your fuel stuff now. It will have the best spool of the 2, and still makes great power.

 

What are your goals for the car other than a quicker spool? Do you want a 450whp dd or are you looking for more than that? From the choices you listed and not knowing how crazy you are trying to make it i would go 6262 for a quicker spool.

 

Well when the car was first put together it was just a track car, but since deciding I would like to drive it on the street now, I am sick of paying $80/5gal of q and have seen you can make the same power on corn as q. so I would like to make the same power, if not more, but will be driving on the street with the boost by gear.

 

spool on both turbos is going to be relatively close. only difference between the two is the larger turbine wheel on the 6265 allows the turbo to max out hp potential of the compressor at lower boost level

 

not trying to thread jack, but im stuck between the 2 turbos as well and dont want to start a new thread beating an old topic.

i have a 84x89mm sleeved
manley tt rods
manley 9.5:1 pistons
endyn b16 fully ported head
type r cams
aeromotive a1000
victor x
t4 ramhorn manifold


i want around 500 on 93/meth and 700 or just under on race gas
I am stuck between 6262 because in t4, 6262's biggest housing is .68 and it has me concerned as far as egt's go

would you think that 6265 would be a lot laggier on my setup, and which a/r exhaust housing would you run on the 6265

in for input

thanks!

 

im mainly wondering what a/r exhaust housing is being run on the t4 6265 setups.

 

T4 .68 is larger than say a t3.68 if they made one. that should be plenty of turbine housing for 700whp. IMO

Why t4 ? if you already have the mani i understand but ist not nessesary for that power level and spool will suffer

 

I am running a t4 6265 and have a 1.15 A/R.

 

T4 V band housings are available from precision up to .96, and that is more than enough on any of the turbos we are talking about. Precision housings flow VERY well and more efficient then Garret housings of the same volume.

The 6265 will spool up maybe 100rpm later and offer another 50 or so whp. It's just a tiny bit bigger. If you want that little extra to hit a goal that is maxxing out the 6262, then the 6265 is for you.

 

are you pickign up 50whp on the 6265 just due to better exhaust flow ? The compressor doesnt change at all between the two units

 

Since it's a stock bore block go with the 6262 bb .82 a/r

I'd like to say a 2.0l or biggest is a little better suited for the 6265 (h22, k20, k24, etc)

 

The exhaust wheel on the 6265 is 3mm larger than the 6262, and can easily account for over 50-100 more whp when pushed.

 

I have a 6262 and absolutely love it, lag is not bad at all on a 1.9l GSR (84x87). I was once in the same position as the OP but ended up going 6262 after hearing all the good reviews, glad I did. Also mine is the JB unit, the spool difference between the JB and BB wasn't enough to justify the $500 dollar price difference, not to mention the cost of rebuilding should the turbo go out (it will eventually go out)

 

Don't think like that, because that's not necessarily true. When put together and maintained by the user properly, turbochargers, regardless of make, should last hundreds of thousands of miles and millions of cycles.

 

Ok thank you for the clarification Mac. i knew more hp was available with better exhaust flow just wasnt sure how much

 

No problem, but those are just approximations, mainly