A/r change isn't going to help much.... still the same size exducer

 

Interesting info.

 

Nothing wrong with an early peak long as it has a good front half and hangs on. What I/c and exh are on car?

 

A bigger t6 a/r housing alone would make a difference, at least keep the power up on the big end, but with a bigger exducer it would make a BIG. Difference and will keep the power curve aimed north...

It doesn't hang on much... Falls off pretty much after 5500rpm, which i think on the track would result in a sad trap speed, but that remains to be seen next feb.
One truck mani and one fabricated manifold (to clear a/c) , 2.5" merge, 4" dump, 4" air to air IC...

 

Sounds sufficient , unless you have a bunch of cobbled up bends. I would run it and see how it does. As long as you are able to keep engine in the power range trap will reflect power shown. I have actually had lower rpm combos trap higher than higher rpm combos. Sometimes chassis dyno's can be missleading due to how it loads, tire slip etc. My truck makes pk power at 52-5500 rpm and has always had a strong trap vs other trucks of similar weight. It will run mid 140's with a T4 pt88 at 4800lbs.

 

Whats the turbine wheel specs?

 

82mm ex if i remember right

 

hey man, you have any pics of your setup? whats the specs on your build? Dont see many 6 speeds running a pt88. Im doing a forged 5.3. 6 speed is at texas drivetrain now. Debating on a Pt7675 or a Pt88. Was worried the 88 might be a bit too laggy with a 6 speed.

any videos? Hows spool between shifts?

 

Depending on how much power you are trying to make I'd stick to the 7675 idea, plenty potent on a 5.3 combo and be over all more fun to drive with quicker spool. That being said I went with a pt8847 on my old 5.4L setup, mostly because I was planning on turning it 8k rpm and turn it up to 1100+rwhp, didn't get that far before I changed direction a bit. Here's a vid from last year of my 6 speed/332ci with the pt8847, its a 6.0 with a 4.8 crank. The cam was pretty big so it wasn't very good spool down low, but it pulled great up top. Didn't lose any boost between shifts, even when shifting slower, the BOV may have been a bit tight too. In car vid at the end.

Build thread with some pics. https://ls1tech.com/forums/forced-in...-pg-5-7-a.html

 

I wouldn't go with the PT88 just because of the sketchy workmanship, i had my brand new unit seize on my with less than 100 miles on it, plenty of oil feed and good drain, PTE's reply was "this unit is mainly designed for the buick grand national v6".

With your engine i would guess a similarly spec'ed turbo would be very good and stay in the sweet spot for longer, although i wouldn't expect full boost under 4600-5000 rpm with your set up. And it is a blast with a 6 speed... Good luck and stay safe...

 

what size with your lines? iv heard a few stories about the pt88s and 7675s going quick ant PT saying too small of a line was used and it starved the turbo.

what were you at full boost by? what heads cam and intake were you running?

 

from what i read on the turbo forum ur 2 2.5in pipes merging into a 3in before the turbo could be hurting u a lil bit by choking it down to much