As i mentioned in another thread the T76 with ptrim turbine poops out at roughly 600~650 rwhp on a 383. Cost to upgrade the exhaust side was too much compared to the shiny new s400 T6 sitting in the box at the turbo shop

So I purchased the s400 (75mm compressor) for about $6xx.00 busted out the grinders and welder and went to town. I asked about the 80mm and was told that I could upgrade this one to an 80mm for about another $500 later on if I needed more than 900hp. 80mm is good to 1200hp btw.

Here are some comparison pictures of a T76 vs s400:

compressor wheels: http://content.glidesociety.com/imag...3-fac5b118f7c1
turbine wheels: http://content.glidesociety.com/imag...f-128e6ba793dc
side by side: http://content.glidesociety.com/imag...1-759ca50deb24

setup pictures taken at various stages of completion (when I needed a break)

up and down pipe:http://content.glidesociety.com/imag...3-001fdaf0667d
up and down pipe2:http://content.glidesociety.com/imag...2-77a4e94e385d
down pipe: http://content.glidesociety.com/imag...6-525793f7eaf8
done: http://content.glidesociety.com/imag...e-47b4ef51c48b

The turbine outlet is 5". The nasty welds around the turbine outlet is where it goes from 5" to 4". The DP is 4" until the around the oil filter where it branches into dual 3" which is then ovaled to clear the brace under the drivers seat then it goes back to 4" on passenger side by drive shaft. At no point does the exhaust hang lower than the spohn torque arm exhaust dip..

My setup keeps power steering, a/c and no core support mods needed. It loses ABS and any wiring by the fuse box. my car has been completely rewired.

this new setup uses the old setups headers and y-pipe. Everything past the 3" vband clamp is new.

old setup: http://content.glidesociety.com/imag...6-4cf89cf0ee4b

This turbo without a doubt prooved that the Ptirm t76 was the problem. I spiked 20psi (and about 2lbs in the pants) on the first outing. the t76 never could breach 15psi. Also the motor felt like it was topped out at 4500 w/t76 but now soars to 6000rpms and fells like there is more left. There is definately more lag but I can hit 10psi by3500rpms hitting it at 2500rpms in 3rd. It slow to build until it hits about 5psi then it takes off like a rocket. I have the 1.32 a/r housing btw and my motor is 383cu" with fully ported trickflow heads a .560 lift "turbo cam" and 8.4:1 compression.

In my hours of research I came across something called a quickspool. I would never pay that much for something so simple to build so I am building my own I am waiting for my wastegate actuator to be delivered but I has the shaft and blade ready to go. I'll post another picture when its done.

DIY quickspool: http://content.glidesociety.com/imag...c-0f1df01a5f09

FYI the DIY quickspool cost about $150. $95 for the actuator and the rest for materials.

 

looking nice. eric bazan made 750 at the wheels with 15psi on a s400.

my car is very similar to yours, however i have a tv7512 with a .95 A/R
spools a little quicker which is nice

wheres your coldside routed with the turbo on that side though?
i put the turbo right infront of the WP so that i could use a factory overflow tank, and run the coldside where the factory CAI would be.

 

I don't have a picture of the cold side yet. The compressor outlet points down to the intercooler and comes up the passenger side into the TB. Basically is 3" out of the turbo all the way to the motor. I had to cut out some of the metal around the compressor outlet to make it fit. My cooling system is 100% aftermarket and I do not currently have an overflow tank.

I tried pusher fans only on mine and the Texas heat said I needed more. I have a 1/2 filled block which ups the cooling requirement. So I have a 15" puller w/shroud and two 10" pusher fans on the dual 1.5" core radiator to keep it cool.

I'm hoping this quickspool thing will get it closer to the t76s' spool.

 

man this makes me excited, im doin a s400 build and getting close to done! i need to take some pics of mine, but mine is more of a race build. im excited, you got any sound clips?

 

whoa whoa! bruceville? im in hewitt, do i know you? u ever come into waco?

EDIT...... i just realized who you are, i meet you at jacks one night i believe!

 

SMR,

Very cool idea on the variable A/R. I've read about that, but never thought about it long enough to go make it. How does the actuator work? Manifold pressure referenced I would guess?

-Scott.

 

4sfedz,

I don't come out much anymore. Family and work consume most of my time. I'm the giant in the red firebird that adam hates

You can hop in the passenger seat if you want to hear it I should have it back together and testing the quick spool by the middle of next week.

boosted-lt1,

I got the idea from someone on LS1 tech who got the idea from a place called sound performance. Sound performance sells on of these for $800!!!!!! I've seen graphs and stuff that show the quicker spool and well I want to see what it can do.

They use a boost referenced wastegate actuator to control the flap. Flap stays closed until about 5psi then starts to open with boost to regulate exhaust flow. The principle is simple: take a water hose and put you finger on the end of it blocking 1/2 and see how much pressure you got compare to no resistance. You end up hitting the turbine wheel with the same amount of gas but just about twice as much pressure and only 1/2 the turbine see that pressure initially. Everything I have read says it works so we will see

 

there is a guy over on theturboforums.com that did the same idea. it works for him. i think what he essentially did was set the flapper up to an electronic cutout motor, which was activated by a hobbs switch.

 

hmmmm I'm going to have to look into this quick spool thing as well. Still not sure if I'll need it since I'm looking at much lower boost level. However, with my desire to have a stroker power curve with a turbo car, this may help bring my boost on even sooner and help me obtain my goals.

Do post up once you get it working and let us know how you like it.

 

So wheres that t76 going? I know someone who's sucking a t70 dry.

 

did you get that at majestic? thats where i got mine but i was wondering bout the 80mm upgrade?

 

I'm gonna stick it on my 05' gto

4SFEDZ,

Yes, I bought it at majestic in Waco. I was going to get the 80mm (would have had to order it) but he said he could upgrade the 75mm to 80mm later if I wanted for the cost of the compressor wheel housing and machine work which was roughly $600. Atleast that is what he said..

 

So when do we get numbers on the new setup?

We can all use quicker spool - maybe I'll check that out.

 

Got it back together and a couple of scans.

quickspool verdict: it works. not "holy **** wow" but it works.

FYI for anyone who wants to do this there is one requirement. You have to have a divided turbine housing. From what I have read it will not work on the single inlet type.

I have two scans to show the effect of the valve opening. 1st picture you cant tell much effect, it is a 2nd to 3rd gear run. Granted its not ***** to the wall racing just a quick blip of the throttle to see if it works. The dark blue line is the boost.

http://content.glidesociety.com/imag...b-f71ed9d55618

Though not noticeable in this scan you can tell just driving that it is spooling faster just barely getting on it.

Second scan obviously shows a difference. The quickspool wastegate is set to open at 7.5psi (which is adjustable) and the EBC is set at 10psi

http://content.glidesociety.com/imag...8-80dcb23c1f4b

The boost rampup starts to change right at 7.5 psi. This run started at 2000rpm in 4th gear.

I thought I had some more scans of a 1st through 4th run and a few others but the stupid USB cable came loose and it did not record and now its starting to sprinkle

Now I have to get back to tuning and get enough fuel at 15+psi




what numbers are you looking for?

 

Dyno - The old turbo was out of steam. Whats it going to make now?