Looking to reduce some drive pressure...

[Extended Power]

http://www.youtube.com/watch?v=WYwQYglX-d0&feature=channel&list=UL

Here is what the gauges are looking like while the truck is in 4x4, and I roll into it.

Bottom gauge is a 0-100 psi measuring the drive pressure off the engine exhaust manifolds.
Next gauge is a 0-60 psi for the pressure driving the primary. (82mm)
Next gauge is a 0-60 psi measuring the pressure out of the primary. (82mm)
Top gauge is a 0-100 psi which is measuring the total boost into the engine.

What I see:
80-95psi drive to the secondary turbo. (63/68/.70)
~50 psi drive to the primary. (82/92/1.10)
30 psi out of the primary.
~60 psi total boost to the engine.

I would still like to reduce the amount of drive pressure to the secondary, but not loose any spool up, so I can retain the streetability of the set up.

Thoughts, options, & ideas???

 

[Cutting-Edge Diesel]

you have a external gate?

 

[kevin]

I would have thought you would have more total boost then that... I see 55psi with 205s... external gate ftw

 

[Extended Power]

No external gate.
The secondary is a T3, internally waste gated housing.
I have opened up the ports to 0.620" but still have too much back pressure.

I also feel that the HX40 flange is not sealing 100%, and I have had to tighten the up pipes twice, as when they leak, it sounds like a blown bellows....but tightening them down seals them up again.

 

[Extended Power]

I would have thought you would have more total boost then that... I see 55psi with 205s... external gate ftw

My question to you: What do you see for back pressure/drive pressure to your 62/70?

Your turbine wheel is a 65mm, so if anything, your drive might be higher then mine, and overspeeding your secondary.

What are you getting out of your primary for pressure?

 

[kevin]

At what psi does the bp really start to out climb total boost psi?

 

[kevin]

I'm really starting to wonder if my bp guage was reading low after seeing your numbers.. I was getting 63 psi of bp at 55 psi of boost

 

[Cutting-Edge Diesel]

External gate is what you need. I see 62-63psi of boost and ~75psi bp on fuel with my 66/74/70 and s483

When I had my 62/68/70 on there I was spraying it at the track with my gate closed up to much and was seeing 90-95psi of back pressure and my thrust bearing chit the bed.

 

[Extended Power]

I don know....I bought a GoPro to video the gauges for me instead of me trying to hold a phone camera, and drive at the same time....

I just think that if the drive pressure "through" the secondary had less restriction from using a bigger exhaust wheel, a couple of things will/should happen:
1 -the bigger wheel will have more "power" to be able to do more work.
2 -the bigger wheel will flow more all the time, which would help bring on the primary quicker.

I don't really like how the drive pressure swaths when the gates are swinging, so if I step up to say a 73mm turbine wheel, and put the BD diverter valve back in...it may work good, and I may be able to tac the gates closed.

 

[kevin]

I haven't checked the 478 pressures yet.. I think i will when I get home next week

 

[Extended Power]

Well...I have a .80 A/R housing coming from a vendor on another forum...along with a 66/73/.70 if the guy ever gets it off his truck...or off the shelf..."cough", "cough"..Shawn.

 

[Extended Power]

External gate is what you need. I see 62-63psi of boost and ~75psi on fuel with my 66/74/70 and s483

When I had my 62/68/70 on there I was spraying it at the track with my gate closed up to much and was seeing 90-95psi of back pressure and my thrust bearing chit the bed.

uhmm...you never did get back to me on any of that...

You said I wasn't asking for much, and I said I thought I was helping, by being very specific as to what I wanted.LOL

 

[Cutting-Edge Diesel]

uhmm...you never did get back to me on any of that...

You said I wasn't asking for much, and I said I thought I was helping, by being very specific as to what I wanted.LOL

huh? sorry if I was suppose to get back to you and never did.

 

[Matt]

External gate dumping to your primary, drive it a little harder.

 

[Pizza pig]

External gate dumping to your primary, drive it a little harder.

yeah buddy

 

[Extended Power]

huh? sorry if I was suppose to get back to you and never did.

Opps...sorry Matt.

It was a different vendor, on a different forum.:doh:

 

[Matt]

By the time the gate starts to open your secondary should be spooled. Too laggy, adjust gate accordingly.

 

[Extended Power]

External gate dumping to your primary, drive it a little harder.

I have been looking at how I could install it without it being a complete PITA...AND look good...
I haven't come up with anything yet.

You guys have any pix of it done already?

And not on a 6.4...LOL

 

[Matt]

Get an E.d. t3 flange with a wastegate provision, done.

 

[Extended Power]

By the time the gate starts to open your secondary should be spooled. Too laggy, adjust gate accordingly.

Well thats just it though. I had a spring on the wastegate actuator that was too stiff, and the gates weren't opening at all.

Then I backed the spring off more and more till the damn thing shot past my ear...then I had to drive home with the gates hangin open...wow, what a slow, smokey, hot b!tch that was.

Then I swapped out the actuator for one that had a weaker spring, and at least got the gates opening now...but I on't like the swathing of it.

Do you guys have the swathing with the external gates?