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It seemed like the inlet to my turbo wasn't really optimized for flow, so I decided to whip up a quick velocity stack ring for the anti-surge housing.. Not sure how much it helped but it's removable so I can do back to back testing at some point.
Very nice work, looks pretty, quality craftsmanship.
I am not sure if it will actually do anything as the opening on the Holset is pretty wide and short... FWIW though It looks like something I would obsess over and do if I had the time/tools .
You don't think the ring will be forced out when you let off the throttle from air coming back through the anti surge shroud do you? or is it pressed in there pretty tight?
+1 on wanting to see success stories!
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1987 blue na *rip*
1986 metallic gray na Streetport - Alive again!! still in the family
1993 MB *current toy* 310rwhp
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1993 Touring: Tan to Black interior conversion, AZRR Streetport motor, non-sequential twins, Tuned by UMS. thermostat stuck shut and she blew a coolant seal
BMW 325i E30, daily beater
Location: I could tell you, but then I'd have to kill you!
Posts: 1,169
Quote:
Originally Posted by 2a+RoN
I want to start taking more pictures of the little things I've been working on, so should hopefully have some more good stuff to post soon.
You should do like all of us rotary-narcissist, and start you own <forgive the military term> "I Love Me" thread. I'll even throw out a title for your consideration: Aaron Innnovation Funhouse!
I'm not sure I know exactly what you mean...? The velocity stack radius I finished by hand, but I'm guessing somewhere around .75 to 1" radius. The inlet opening diameter is ~2.4", and the outer diameter of the ring is ~3.6". Hope that answers your question.
what's the purpose of the drilled holes on the outside ?
Anti-surge...
Holsett turbos are built for diesel trucks, which do not use BOV's. So instead of air surging through the compressor putting unwanted force on the compressor possibly causing it to rotate the opposite way, it sneaks out through that area.
__________________ what I have:
1985 Gs: 12a All Motor Drag car - 1973 Rx2: Play car What I had:
93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD Conversion - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE: Junked - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2 SOLD
Your idea is way better than mine. But here's what I did to my Holsett (not trying to thread jack, just bored)
Beveled and radius the inlet and removed as much material as possible. The intake attaches to just the main inlet with a velocity stack on the end of that.
Stock:
Modded:
Did this to a friends GT28, he noticed a faster spool up. Have not tested this one yet.
__________________ what I have:
1985 Gs: 12a All Motor Drag car - 1973 Rx2: Play car What I had:
93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD Conversion - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE: Junked - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2 SOLD
Looks good! Unfortunately my lathe isn't large enough to get the entire housing chucked up.. I would've liked to taper further down on the inlet like you did, but I drove the car to the shop that day and was running out of time.
I have done alot fo flow work where I used to work and we used exclusively "3-D " orifice nozzles. The length of the straight section is the diameter, and the radii is also the radius of the opening opening dimension.
That anti surge opening looks like it could kill a ton of velocity. Can you plug it off since you have the ability to install a BOV?
On the trucks some of the turbos cams with a plate over the antisurge ports. Removing the plate made the turbos much louder but also spooled up a bit faster.
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Linear Mode
