I have been debating on changing my turbo set up...
But dont know what way would be better to go...
It currently consist of ....

RCSB
Forged 6.0
WCCH Stage 2 74cc Heads
226/232,571/.578 114+1 Cam
9.5 : 1
3400 Stall
3.90 Gears
TC 78 Front mount - T4, .96 AR exh
4" Down pipe
A/W intercooler
Meth Kit

It put down 582 rwhp on 13 psi, 15 deg, w/meth (how good is this?)
I would like to be atleast 750 rwhp

Cant decide if I want to stay T4 or T6?
Is the turbo log (2-1/2" CM motorsports) to restrictive?
or is it the T4?
Should I just put a PT88 on .. Couple of truck on here making 800 hp plus with it on a 6.0

Or I could do a T-6 88MM?
I have been told that just by going to a T6 I should gain about 100 hp with same psi (less back pressure) is this true?

And I was told that I could just cut the T4 flange off and weld a T6 flange in its place, I really dont see a benefit of doing this since the log is the same size, or am I wrong?
Is the restriction the T4?


Sorry to be full of questions this am...lol

Thanks

 

on my 370 9.0:1 with stock heads and a 76mm turbo at 13psi and 17deg timing made 602rwhp 615tq pump gas and a lil meth.

i think there is more there for you. the 78mm should take you up to 700 i would think.. if you had fuel for it. and if not i would drive it off in the woods and leave it..lol

and the log not beeing big enough is BS. im making of 800 rwhp and going to do close to a 1000 if not over with my TRICK set up. 2 1/2 log. and if not im going to run mine in the woods and leave it....

 

I have a Magnafuel pump in the works already...
Your kit still for sale?
Might just decide to bolt the 88mm to my kit and see what it does.
What do you think it will put down?

 

I would think that a 88mm t6 is too big for a 6.0. I would just up the boost

 

yes and no. if someone was to buy the kit i would sell it but for now its going back on. and my 88mm t-4 would pull its *** off. you can turn that 6.0 a little more than i can the 408. should be up around 800 or so...
yes the t-6 would be a lil much for a street truck.

 

Thats what I was thinking, but it was recommended to me from FI..
I think with my current turbo, any more boost and the efficiency goes out the door and back pressure goes up.

Dont get me wrong the truck runs like hell, and on the street I see 15-16 psi..
I would just hate to see a head go because of back pressure

I am still trying to learn this turbo stuff...lol

 

this turbo stuff is not hard to learn...just put it on the dyno and push it till you see knock...then back it down a deg.....lol

 

a BW s472 or 75 would work ok with ur setup. Still might be a bit laggy but its a t6 housing

 

I think the one I have now spools up to quick, so a little lag might be a good thing...

 

The next step up for you with your current kit is probably a PT88. But I think your biggest problem is that cam. I think that's what's really hurting you since it has 1 degree of overlap and a 6 degree exhaust bias. Before you go switching turbos I would put in a 220/220 114 cam and see what it does. That turbo should be good to 700-750 rwhp on a 6.0.