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Forum: Engine, Exhaust, Transmission

01-23-2013, 06:56 AM

Replies: 240

Lightweight pulley wow

Views: 109,419

Posted By breezy

Crank pulley is also called a damper. Every time...

Crank pulley is also called a damper. Every time a piston is driven down on a power stroke, there is a torque spike in the crankshaft that twists it ever so slightly. After it is twisted, it will...

Forum: Suspension | Chassis | Brakes -- Sponsored by 949 Racing

01-19-2013, 09:35 AM

Replies: 320

Aerodynamics discussion

Views: 170,927

Posted By breezy

Interesting topic! At first glance, I think...

Interesting topic!

At first glance, I think the panels are mainly there to reduce drag coefficient, evidenced by Subaru's findings, but by themselves don't constitute enough to produce noticeable...

Forum: Engine, Exhaust, Transmission

01-14-2013, 08:10 PM

Replies: 71

Sticky: Technical information on the Toyota D-4S system

Views: 209,676

Posted By breezy

Lurker, your question is on how the EDU knows...

Lurker, your question is on how the EDU knows when (plunger position) to energize and de-energize the Solenoid Spill Valve?

I scanned the wiring diagram and noticed that you're right, the EDU...

Forum: Engine, Exhaust, Transmission

01-14-2013, 07:58 PM

Replies: 34

Go Fast Bits - Photos of the pulleys that shed weight for 2013

Views: 11,823

Posted By breezy

That's a nice read from the vendor's website, and...

That's a nice read from the vendor's website, and belongs in a thread that was started by the vendor to promote their product. :clap:

The last sentence begs the question: What defines "engines...

Forum: Engine, Exhaust, Transmission

01-14-2013, 06:51 PM

Replies: 34

Go Fast Bits - Photos of the pulleys that shed weight for 2013

Views: 11,823

Posted By breezy

Probably a tolerance on the balancing of each so...

Probably a tolerance on the balancing of each so they can be interchanged.

Am I the only one who sees the drillings? Do you think they're randomly placed?

Edit: Sorry, Firestrom, didn't see...

Forum: Engine, Exhaust, Transmission

01-13-2013, 09:18 PM

Replies: 60

GFB 3-Piece lightweight aluminum pulley kit

Views: 23,749

Posted By breezy

Yes, there have been people running lightweight...

Yes, there have been people running lightweight pulleys without ill effects. But I've seen a few instances where crankshafts were snapped in half where a damper was not used, and that's enough for...

Forum: Engine, Exhaust, Transmission

01-13-2013, 09:11 PM

Replies: 34

Go Fast Bits - Photos of the pulleys that shed weight for 2013

Views: 11,823

Posted By breezy

?? I wonder what these drillings on the stock...

?? I wonder what these drillings on the stock pulley are then..?

The rubber ring is to absorb torsional vibrations from the crankshaft because your engine fires in a sequence of combustion events...

Forum: Engine, Exhaust, Transmission

01-13-2013, 10:06 AM

Replies: 60

GFB 3-Piece lightweight aluminum pulley kit

Views: 23,749

Posted By breezy

Was any work done to find where the natural...

Was any work done to find where the natural frequency shifted to? Shifting the natural frequency doesn't allow you to run an engine trouble-free without a harmonic damper. It means you need to to...

Forum: Engine, Exhaust, Transmission

11-21-2012, 11:56 PM

Replies: 71

Sticky: Technical information on the Toyota D-4S system

Views: 209,676

Posted By breezy

Lurker, why does the pressure stroke need to...

Lurker, why does the pressure stroke need to occur when all injectors are closed?

The pump timing doesn't seem to have (or need) a direct relationship to injection timing.

My guess is: based on...

Forum: Engine, Exhaust, Transmission

07-21-2012, 11:50 AM

Replies: 27

Reaching redline.

Views: 18,959

Posted By breezy

The redline is there because that's the highest...

The redline is there because that's the highest RPM that Subaru is promising safe operation without engine failure. Above that, things may start to happen (valve float, lubrication issues, etc.) that...

Forum: BRZ First-Gen (2012+) -- General Topics

03-23-2012, 12:02 PM

Replies: 152

Are you waiting for Turbo?

Views: 26,124

Posted By breezy

I'll wait for brembos and a revised suspension...

I'll wait for brembos and a revised suspension package. But no thanks on the turbo!

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